As filed with the Securities and Exchange Commission on October 5, 2026

Registration No. 333-299024

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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Amendment No. 1 to
FORM S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

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RETENSION PHARMACEUTICALS, INC.
(Exact name of Registrant as specified in its charter)

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1104 West Broad Street #1029
Falls Church, Virginia 22046
(703) 940-9761
(Address, including zip code, and telephone number, including area code, of Registrant’s principal executive offices)

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Eric Keller
Chief Executive Officer
Retension Pharmaceuticals, Inc.
1104 West Broad Street #1029
Falls Church, Virginia 22046
(703) 940-9761
(Name, address, including zip code, and telephone number, including area code, of agent for service)

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Copies to:

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Approximate date of commencement of proposed sale to the public: As soon as practicable after this registration statement becomes effective.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment that specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

The information in this preliminary prospectus is not complete and may be changed. These securities may not be sold until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell these securities nor is it soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

TABLE OF CONTENTS

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We have not, and the underwriters have not, authorized anyone to provide you with any information or to make any representations other than the information or representations contained in this prospectus or in any related free writing prospectuses prepared by or on behalf of us or to which we have referred you, and we and the underwriters take no responsibility for, and can provide no assurance as to the reliability of, any other information others may give you. We and the underwriters are offering to sell, and seeking offers to buy, shares of our common stock only under circumstances and in jurisdictions where it is lawful to do so. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should not assume that the information contained in this prospectus or any free writing prospectus is accurate as of any date other than its date, regardless of its time of delivery or of any sale of shares of our common stock. Our business, financial condition, results of operations and prospects may have changed since that date.

For investors outside the United States: neither we nor the underwriters have done anything that would permit this offering or the possession or distribution of this prospectus in any jurisdiction where action for those purposes is required, other than in the United States. Persons outside of the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the shares of our common stock and the distribution of this prospectus outside of the United States.

Market and Industry Data

We use industry, market and competitive position data throughout this prospectus, which we have obtained from independent market research, industry, and general publications and surveys, governmental agencies, and publicly available information in addition to research, surveys, and studies conducted by third parties. These sources generally state that the information they provide has been obtained from sources believed to be reliable, but that the accuracy and completeness of the information are not guaranteed. The content of these third-party sources, except to the extent specifically set forth in this prospectus, does not constitute a portion of this prospectus and is not incorporated herein. We also use data based on our internal estimates, which are derived from publicly available information released by industry analysts and third-party sources, our internal research, and our industry experience and are based on assumptions made by us based on such data and our knowledge of our industry and potential market, which we believe to be reasonable. The use of such data in this prospectus involves risks and uncertainties that are subject to change based on various factors discussed in the sections titled “Risk Factors” and “Special Note Regarding Forward-Looking Statements.” In addition, projections, assumptions, and estimates of our future performance and the future performance of the industry in which we operate are necessarily subject to a high degree of uncertainty and risk due to a variety of factors, including those discussed herein. These and other factors could cause results to differ materially from those expressed in, or implied by, the estimates made by independent parties and by us. Furthermore, we cannot assure you that a third party using different methods to assemble, analyze or compute industry and market data would obtain the same results.

Presentation of Financial Information

The consolidated financial statements included elsewhere in this prospectus have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and audited in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”). All financial information presented in this prospectus should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements, including the notes thereto, included elsewhere in this prospectus.

The consolidated financial statements included as of and for the fiscal year ended December 31, 2025 in this prospectus have been restated to correct an error from our previously issued consolidated financial statements. For further information regarding the restatement of our consolidated financial statements as of and for the fiscal year ended December 31, 2025, see Note 3, “Restatement of Previously Issued Financial Statements,” to our consolidated financial statements included elsewhere in this prospectus. See also “Risk Factors — We have identified a material weakness in our internal control over financial reporting...” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Estimates — Internal Control Over Financial Reporting.”

Numerical Figures

Numerical figures included in this prospectus have been subject to rounding adjustments. Accordingly, numerical figures shown as totals in various tables may not be arithmetic aggregations of the figures that precede them.

Risk Factors

Investing in our common stock involves a high degree of risk. You should consider carefully the risks and uncertainties described below, together with all of the other information in this prospectus, including the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes, before making a decision to invest in our common stock. Our business, results of operations, financial condition and prospects could also be harmed by risks and uncertainties that are not presently known to us or that we currently believe are not material. If any of the risks actually occur, our business, financial condition, results of operations and prospects could be materially and adversely affected. In such event, the market price of our common stock could decline, and you could lose all or part of your investment.

Risks Related to Our Limited Operating History, Business, Financial Position and Capital Requirements

We have a limited operating history, have incurred significant operating losses since our inception and expect to incur significant losses for the foreseeable future. We may never generate revenue or become profitable or, if we achieve profitability, we may not be able to sustain it.

Biopharmaceutical product development is a highly speculative undertaking and involves a substantial degree of risk. We are a clinical-stage biopharmaceutical company with a limited operating history upon which you can evaluate our business and prospects. We commenced operations in 2023 and, to date, we have focused primarily on organizing and staffing the Company, business planning, raising capital, in-licensing our product candidate, RTN-001, establishing our intellectual property portfolio and conducting research, preclinical studies and clinical trials. We have not yet completed any clinical trials, obtained regulatory approvals, manufactured products at commercial scale, or arranged for a third party to do so on our behalf, or conducted sales and marketing activities necessary for successful product commercialization. Consequently, any predictions made about our future success or viability may not be as accurate as they could be if we had a history of successfully developing and commercializing biopharmaceutical products.

We have incurred significant operating losses since our inception and expect to incur significant losses for the foreseeable future. We do not have any products approved for sale and have not generated any revenue since our inception. If RTN-001 is not successfully developed, approved and commercialized, we may never generate significant revenue, if we generate any revenue at all. Our net losses were $6.3 million and $1.9 million for the fiscal years ended December 31, 2025 and 2024, respectively. Our net losses were $7.5 million and $1.9 million for the six-month periods ended June 30, 2026 and 2025, respectively. As of June 30, 2026 and December 31, 2025, we had an accumulated deficit of $15.8 million and $8.3 million, respectively. Substantially all of our losses have resulted from expenses incurred in connection with developing RTN-001 and from general and administrative costs associated with our operations. RTN-001 will require substantial additional development, time and resources before we would be able to apply for or receive regulatory approvals and begin generating revenue from product sales. We expect to continue to incur losses for the foreseeable future, and we anticipate these losses will increase substantially as we continue our development of, seek regulatory approval for and potentially commercialize RTN-001, seek to identify, assess, acquire, in-license intellectual property related to or develop additional product candidates and become a public company.

To become and remain profitable, we must succeed in developing, obtaining regulatory approvals for and eventually commercializing products that generate significant revenue. This will require us to be successful in a range of challenging activities, including completing preclinical studies and clinical trials of RTN-001 and any future product candidates, obtaining regulatory approval for RTN-001 and any future product candidates, potentially acquiring additional product candidates and manufacturing, marketing, and selling any products for which we may obtain regulatory approval. We are only in the preliminary stages of most of these activities. We may never succeed in these activities and, even if we do, may never generate revenue that is significant enough to achieve profitability. In addition, we have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical industry. Because of the numerous risks and uncertainties associated with biopharmaceutical product development, we are unable to accurately predict the timing or amount of increased expenses or when, or if, we will be able to achieve profitability. Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable may have an adverse effect on the value of the Company and could impair our ability to raise capital, expand our business, maintain our research and development efforts, diversify our product candidates, achieve our strategic objectives or even continue our operations. A decline in the value of the Company could also cause you to lose all or part of your investment.

Our recurring losses from operations and financial condition raise substantial doubt about our ability to continue as a going concern and the report of our independent registered public accounting firm on our financial statements as of and for the fiscal year ended December 31, 2025 includes an explanatory paragraph indicating that there is substantial doubt about our ability to continue as a going concern.

Our audited consolidated financial statements and unaudited interim condensed consolidated financial statements, each included elsewhere in this prospectus, were prepared assuming that we will continue as a going concern. The going concern basis of presentation assumes that we will continue in operation for the foreseeable future and will be able to realize our assets and satisfy our liabilities in the normal course of business and do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or amounts and classification of liabilities that may result from our inability to continue as a going concern. As of June 30, 2026, we had $13,493,037 in cash and cash equivalents. Our net losses were $6.3 million and $1.9 million for the fiscal years ended December 31, 2025 and 2024, respectively. Our net losses were $7.5 million and $1.9 million for the six-month periods ended June 30, 2026 and 2025, respectively. As of June 30, 2026 and December 31, 2025, we had an accumulated deficit of $15.8 million and $8.3 million, respectively.

Our management has concluded that we do not have sufficient capital resources to fund our operating plan for approximately twelve months from the date of issuance of the unaudited interim condensed consolidated financial statements included elsewhere in this prospectus, and the report of our independent registered public accounting firm on our financial statements as of and for the fiscal year ended December 31, 2025 includes an explanatory paragraph indicating that there is substantial doubt about our ability to continue as a going concern. We will need to raise additional equity or debt capital to further fund our operating cash needs for the period that is twelve months from the date of issuance of the unaudited interim condensed consolidated financial statements. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our capital resources sooner than expected. As of the date of issuance of the unaudited interim condensed consolidated financial statements, additional capital has not yet been secured. As a result, these conditions and events raise substantial doubt about our ability to continue as a going concern within twelve months after the date the unaudited interim condensed consolidated financial statements included elsewhere in this prospectus are issued.

If we are unable to continue as a going concern, we may have to liquidate our assets and may receive less than the value at which those assets are carried on our financial statements, and it is likely that investors will lose all or part of their investment.

Moreover, substantial doubt about our ability to continue as a going concern may materially and adversely affect the price per share of our common stock. If we seek additional financing to fund our business activities in the future and there remains substantial doubt about our ability to continue as a going concern, investors and other financing sources may be unwilling to provide additional funding to us on commercially reasonable terms, if at all. The perception that we may not be able to continue as a going concern may also cause others to choose not to invest or otherwise collaborate with us due to concerns about our ability to meet our contractual obligations. If existing or potential collaborators decline to do business with us or potential investors decline to participate in any future financings due to such concerns, our ability to increase our cash position may be limited.

We will require substantial additional capital to finance our goals, and a failure to obtain this necessary capital when needed on acceptable terms, or at all, could force us to delay, limit, reduce or terminate our development programs, commercialization efforts or other operations.

The development of biopharmaceutical product candidates is capital-intensive. We expect our expenses to substantially increase as we become a public company and in connection with our ongoing activities, particularly as we conduct our ongoing and future clinical trials for RTN-001 and potentially seek regulatory approval for RTN-001 and any future product candidates we may develop. In addition, if we are able to progress RTN-001 through development and commercialization, we will be required to make royalty payments to Kadmon Corporation LLC (f/k/a Kadmon Pharmaceuticals, LLC) (“Kadmon”) from whom we have in-licensed intellectual property related to RTN-001. If we obtain regulatory approval for RTN-001 or any future product candidates, we also expect to incur significant commercialization expenses related to product manufacturing, marketing, sales and distribution. Because the outcome of any preclinical study or clinical trial is highly uncertain, we cannot reliably estimate the actual amount of financing necessary to successfully complete the development and commercialization of RTN-001 or any future product candidates. Furthermore, following the closing of this offering, we expect to incur additional costs associated with

operating as a public company. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. If we are unable to raise capital when needed or on attractive terms, we could be forced to delay, reduce or eliminate our research and development programs or any future commercialization efforts.

As of June 30, 2026, we had $13,493,037 in cash and cash equivalents. Based on our current operating plan, we believe that the net proceeds from this offering, together with our existing cash and cash equivalents, will enable us to fund our operations for at least the next 21 months from the date of this prospectus. We have based these estimates on assumptions that may prove to be wrong, and we could use our capital resources sooner than we currently expect. Our operating plans and other demands on our cash resources may change as a result of many factors currently unknown to us, and we may need to seek additional funds sooner than planned. The net proceeds of this offering, together with our existing cash and cash equivalents, will not be sufficient to complete development of RTN-001, or any future product candidate, and after this offering, we will require substantial capital in order to advance RTN-001 and any future product candidates through clinical trials, regulatory approval and commercialization. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. Our ability to raise additional funds may be adversely impacted by potential worsening global economic conditions and the disruptions to, and volatility in, the credit and financial markets in the United States and worldwide resulting from factors that include but are not limited to inflation, high interest rates, geopolitical conflicts in Russia and Ukraine, Iran and the Middle East, South America and other areas, regulatory and policy changes, including increases in tariffs, diminished liquidity and credit availability, declines in consumer confidence, declines in economic growth, increases in unemployment rates and uncertainty about economic stability. If the equity and credit markets deteriorate, it may make any necessary debt or equity financing more difficult, more costly and more dilutive. If we are unable to raise capital when needed or on attractive terms, we could be forced to delay, reduce or eliminate our research and development programs or any future commercialization efforts, or even cease operations. We expect to finance our cash needs through public or private equity or debt instruments or other capital sources, including potential collaborations, licenses and other similar arrangements. In addition, we may seek additional capital due to favorable market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans. Attempting to secure additional financing may divert our management from our day-to-day activities, which may adversely affect our ability to develop RTN-001 and any future product candidates.

Our future capital requirements will depend on many factors, including, but not limited to:

•        the initiation, type, number, scope, progress, expansions, results, costs and timing of preclinical studies and clinical trials of RTN-001 and any future product candidates we may choose to pursue, including any modifications to clinical development plans based on feedback that we may receive from regulatory authorities;

•        the costs and timing of manufacturing for RTN-001, or any future product candidate, including commercial manufacture at sufficient scale, if any product candidate is approved, including as a result of inflation, any supply chain issues or component shortages;

•        requirements of regulatory authorities in any additional jurisdictions in which we may seek approval for RTN-001 and any future product candidates and our anticipated timing for seeking approval in such jurisdictions;

•        the costs, timing and outcome of regulatory meetings and reviews of RTN-001 or any future product candidates;

•        any delays and cost increases that may result from supply chain issues, including as a result of geopolitical conflicts, public health concerns or changes in regulations and policies, including increases in tariffs;

•        the costs of obtaining, maintaining, enforcing and protecting our patents and other intellectual property and proprietary rights;

•        our efforts to enhance operational systems and hire additional personnel to satisfy our obligations as a public company, including enhanced internal control over financial reporting;

•        the costs associated with hiring additional personnel and consultants as our business grows, including additional executive officers and clinical development, regulatory, Chemistry, Manufacturing, and Control quality and commercial personnel;

•        the timing and amount of the milestone, royalty or other payments we must make to Kadmon, from whom we have in-licensed intellectual property critical to RTN-001, or any future licensors;

•        the costs and timing of establishing or securing sales and marketing capabilities if RTN-001 or any future product candidate is approved;

•        our ability to achieve sufficient market acceptance, coverage and adequate reimbursement from third-party payors and adequate market share and revenue for any approved products;

•        our ability and strategic decision to develop future product candidates other than RTN-001, and the timing of such development, if any;

•        patients’ willingness to pay out-of-pocket for any approved products in the absence of coverage and/or adequate reimbursement from third-party payors;

•        the terms and timing of establishing and maintaining collaborations, licenses and other similar arrangements; and

•        costs associated with any products or technologies that we may in-license or acquire.

Conducting preclinical studies and clinical trials and potentially identifying future product candidates is a time consuming, expensive and uncertain process that takes years to complete, and we may never generate the necessary data or results required to obtain regulatory approval and commercialize RTN-001 or any future product candidates. If approved, RTN-001 and any future product candidates may not achieve commercial success. Our commercial revenue, if any, will initially be derived from sales of RTN-001, which we do not expect to be commercially available for many years, if at all. Accordingly, we will need to continue to rely on additional financing to achieve our business objectives. Adequate additional financing may not be available to us on acceptable terms, or at all.

We will need to develop and expand our organization, and we may encounter difficulties in managing our growth and expanding our operations successfully, which could adversely affect our business, financial condition, results of operations and prospects.

As of September 16, 2026, we had engaged 12 full-time professionals. As we continue development and pursue the potential commercialization of RTN-001 and any future product candidates, and as we transition to operating as a public company, we will need to expand our financial, accounting, development, regulatory, manufacturing, information technology, marketing and sales capabilities or contract with third parties to provide these capabilities for us. As our operations expand, we expect that we will need to manage additional relationships with various strategic partners, suppliers and other third parties and we may not be successful in doing so. Our future financial performance and our ability to develop and commercialize RTN-001 and any future product candidates and to compete effectively will depend, in part, on our ability to manage any future growth effectively.

In addition, job candidates and existing employees and consultants often consider the value of the stock awards they receive in connection with their employment. If the perceived benefits of our stock awards decline, either because we are a public company or for other reasons, it may harm our ability to recruit and retain highly skilled employees and consultants. Our employees and consultants may be more likely to leave us if the shares they own have significantly appreciated in value relative to the original purchase prices of the shares, or if the exercise prices of the options that they hold are significantly below the market price of our common stock, particularly after the expiration of the lock-up agreements described herein.

We will need to expand and effectively manage our managerial, operational, financial and other resources in order to successfully pursue our clinical development and commercialization efforts. We may not be successful in maintaining the Company culture and continuing to attract or retain qualified management and scientific and clinical personnel in the future due to the intense competition for qualified personnel among biopharmaceutical, biotechnology and other businesses. Our industry has experienced a high rate of turnover of management personnel in recent years. If we are not able to attract, integrate, retain and motivate necessary personnel to accomplish our business objectives, we may experience constraints that will significantly impede the achievement of our development objectives, our ability to raise additional capital and our ability to implement our business strategy.

We are dependent on the services of our management and other clinical and scientific personnel, and if we are not able to retain these individuals or recruit additional qualified personnel, our business will suffer.

Our success depends in part on our continued ability to attract, retain and motivate highly qualified management, clinical and scientific personnel, including Eric Keller, our CEO, and Dr. Paul Sweetnam, our CSO. We are highly dependent upon our senior management, as well as our senior scientists and other members of our management team. The loss of services of any of these individuals could delay or prevent the successful development of RTN-001 or any future product candidates, initiation or completion of our preclinical studies and clinical trials, regulatory approvals or the commercialization of RTN-001 or any of our product candidates. Although we have executed consultant letters with each member of our senior management team, these agreements are terminable at will with or without notice and, therefore, we may not be able to retain their services as expected. We do not currently maintain “key person” life insurance on the lives of our executives or any of our employees or consultants. This lack of insurance means that we may not have adequate compensation for the loss of the services of these individuals.

In addition, we rely on consultants and advisors, including the members of our Scientific Advisory Board, to assist us in formulating our research and development strategy. The members of our Scientific Advisory Board are employed by, or have consulting, teaching, clinical or other commitments to, academic or medical institutions or other entities other than us, and each of them devotes only a limited portion of his or her time to our affairs. Our advisory arrangements are terminable at will, and to the extent a member of our Scientific Advisory Board is subject to obligations to his or her primary employer or to another institution, those obligations take precedence over any obligation to us. Certain of our consultants and advisors may also provide services to, or hold equity in, other companies that are developing products that may compete with RTN-001, which could give rise to actual or perceived conflicts of interest. If we are unable to retain the services of our consultants and advisors, or if they do not devote sufficient time to our programs, the development of RTN-001 could be delayed and our business plans could be negatively impacted. See “Management — Scientific Advisory Board.”

Our CEO and CSO have significant responsibilities outside of the Company, which may divert their time and attention from our business and could adversely affect our operations and prospects.

We are a clinical-stage biopharmaceutical company with limited operating history and a small management team, and the successful development and commercialization of RTN-001, if approved, will require significant managerial oversight. As it stands, we are highly dependent upon the services of Eric Keller, our CEO, and Dr. Paul Sweetnam, our CSO, for the strategic direction, business operations, clinical development, and overall management of the Company. In addition to their responsibilities with the Company, Mr. Keller currently serves as acting President and a director of Noveome Biotherapeutics, Inc.; manager of Redux; co-founder and director of Response Pharmaceuticals, Inc. (“Response”); and co-founder, CEO and director of Restor Pharmaceuticals, Inc. (“Restor”). Dr. Sweetnam currently serves as a manager of Redux; co-founder and CSO of Response; and co-founder, CSO and director of Restor.

While each of these outside roles do not represent a material time commitment for either Mr. Keller or Dr. Sweetnam, these outside roles and responsibilities in the aggregate will require a significant portion of Mr. Keller’s and Dr. Sweetnam’s attention and could divert each executive’s focus from his duties as our CEO and CSO, respectively.

In connection with the Company becoming a publicly traded company, Mr. Keller plans to resign from one or more of his outside roles, including his role as CEO of Restor, which role will be assumed on an interim basis by one of our directors, Mr. Berendt. Mr. Keller is currently an employee for the Company and works on average 40 hours per week. Dr. Sweetnam is currently a consultant for the Company and works on average 20 hours per week. However, Mr. Keller and Dr. Sweetnam are each expected to work for the Company at least 40 hours per week following the closing of this offering.

If either Mr. Keller or Dr. Sweetnam is unable to devote sufficient time and attention to our business due to their commitments at other companies or their other business activities, we may experience delays in our development programs, fail to capitalize on business opportunities and encounter difficulties in managing our operations. The loss of Mr. Keller’s or Dr. Sweetnam’s services, or their inability to devote adequate time to our company, could harm our ability to implement our business strategy and develop RTN-001.

Our CEO and CSO have founded and are associated with other companies operating in the same or adjacent industries, some of which share common directors with us, which may give rise to actual or perceived conflicts of interest.

Our CEO and CSO are co-founders of Response and Restor, which are companies that operate in the same or adjacent industries as our company. Except as otherwise disclosed in this prospectus, while there are no existing commercial arrangements between our company and those entities, certain members of our board of directors also serve as directors of one or more of these affiliated companies. These overlapping governance relationships may create actual or perceived conflicts of interest that could adversely affect our business, reputation, and the market price of our securities. Directors serving on the boards of multiple companies in the same or adjacent industries may become aware of business opportunities, strategic transactions, or other assets that could benefit us or an affiliated entity, and there can be no assurance that such opportunities will be presented to us or resolved in our favor. Because these affiliated companies operate in the same or adjacent industries, they may also compete with us for technologies, talent, partnerships, and market opportunities, potentially placing us at a competitive disadvantage. Even absent actual conflicts, the overlapping directorships and common founding relationships may create a concern among investors, analysts, and other market participants regarding independence or that our strategic decisions are influenced by the interests of affiliated entities, which could reduce investor confidence in our corporate governance, depress the trading price of our securities, or invite heightened regulatory or activist scrutiny. If we were to enter into commercial arrangements with the affiliated companies in the future, such transactions could be subject to heightened scrutiny and may not be on terms as favorable as those obtainable from unaffiliated third parties. If we are unable to effectively manage actual or perceived conflicts of interest arising from these relationships, our business, financial condition, and results of operations, as well as the market price of our securities, could be materially and adversely affected.

We recently identified and corrected certain accounting errors in our previously issued financial statements, resulting in the restatement of our consolidated financial statements as of and for the fiscal year ended December 31, 2025. If we discover additional errors in the future, it could adversely affect investor confidence and our stock price.

During the preparation of our unaudited interim condensed consolidated financial statements for the six months ended June 30, 2026, we identified certain accounting errors that required the restatement of our consolidated financial statements as of and for the fiscal year ended December 31, 2025, as described in Note 3, “Restatement of Previously Issued Financial Statements,” to our consolidated financial statements included elsewhere in this prospectus. The accounting error was related to advance payments made to a contract research organization (“CRO”), in which such advance payments were incorrectly recognized as expenses when the related invoices were paid, when they should have been recorded as prepaid expenses and recognized as research and development expense as the related clinical trial activities were performed. The discovery of further errors in the future, whether related to this error or not, could require us to further restate or revise our financial statements. Any such future restatements or revisions could result in a loss of investor confidence in the accuracy of our financial reporting, which could have a material adverse effect on our stock price and our business.

We have identified a material weakness in our internal control over financial reporting. Failure to remediate such material weakness or maintain effective internal controls could cause our investors to lose confidence in us and adversely affect the market price of our common stock.

Our management is responsible for establishing and maintaining adequate internal control over financial reporting as required under Section 404 of the Sarbanes-Oxley Act. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with GAAP. A material weakness is a deficiency, or combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the annual or interim financial statements will not be prevented or detected on a timely basis. In connection with the preparation of our unaudited interim condensed consolidated financial statements for the six months ended June 30, 2026, we identified a material weakness in the design of our internal controls over financial reporting related to the accounting for advance payments made to a CRO. Specifically, these advance payments were incorrectly recognized as expenses when the related invoices were paid rather than recorded as prepaid expenses and subsequently recognized as research and development expense as the related clinical trial activities were performed. As a result, we have restated our previously issued consolidated financial statements as of and for the year ended December 31, 2025, as described in Note 3 to the consolidated financial statements.

Since the fiscal year ended December 31, 2025, we have proactively taken steps to improve our internal control over financial reporting. These actions include hiring a Chief Financial Officer, expanding the accounting and finance team and formalizing and documenting our internal control framework. We have implemented, and continue to implement, additional remediation measures to address the material weakness, including (i) hiring and retaining additional accounting and finance personnel with appropriate public company reporting and internal control expertise; (ii) enhancing and documenting our internal control framework, including risk assessment and monitoring activities; (iii) engaging third-party advisors to assist in the review of CRO arrangements and related accruals and prepaid balances; and (iv) designing and implementing enhanced review, oversight and approval controls.

We may incur significant costs to remediate this material weakness. We may not be successful in implementing these remediation efforts or in implementing effective internal control over financial reporting, which may undermine our ability to provide accurate, timely and reliable reports on our financial and operating results. Further, we will not be able to fully assess whether the steps we are taking will remediate the material weakness in our internal control over financial reporting until we have completed our implementation efforts and sufficient time passes in order to evaluate their effectiveness. In addition, if we identify additional errors that result in material weaknesses in our internal control over financial reporting, we may not detect errors on a timely basis and our financial statements may be materially misstated.

Further, during the preparation of our audited consolidated financial statements for the year ended December 31, 2024, we had identified a material weakness in our internal control over financial reporting related to certain material audit adjustments that were identified in the Company’s consolidated financial information. Following implementation of a remediation plan which included, among others, additional checklists and levels of review to ensure that the Company’s system of internal control over financial reporting produced consistently reliable consolidated financial statements and mitigated the risk of misstatement due to error or fraud, after testing to verify the effective design and successful operating effectiveness of the new and enhanced controls, management determined that the previously disclosed material weakness had been remediated as of June 30, 2025.

Pursuant to Section 404 of the Sarbanes-Oxley Act, our management will be required to report upon the effectiveness of our internal control over financial reporting beginning with the annual report for our fiscal year ending December 31, 2027. When we lose our status as an “emerging growth company” and do not otherwise qualify as a “smaller reporting company” with less than $100 million in annual revenue, our independent registered public accounting firm will be required to attest to the effectiveness of our internal control over financial reporting. The rules governing the standards that must be met for our management to assess our internal control over financial reporting are complex and require significant documentation, improvements in management controls, reporting systems and procedures, testing and remediation. If we or, if required, our auditors are unable to conclude that our internal control over financial reporting is effective, investors may lose confidence in our financial reporting and the trading price of our common stock may decline.

We cannot assure you that the measures we have taken to date, and actions we may take in the future, will be sufficient to remediate future control deficiencies that may lead to a material weakness in our internal control over financial reporting or that they will prevent or avoid potential future material weaknesses. Our current controls and any new controls that we develop may become inadequate because of changes in conditions in our business. We cannot assure you that there will not be material weaknesses or significant deficiencies in our internal control over financial reporting in the future.

Any failure to maintain internal control over financial reporting could severely inhibit our ability to accurately report our financial condition, results of operations or cash flows. If we fail to remedy any material weakness in our internal control over financial reporting, if we identify new material weaknesses in our internal control over financial reporting, if we are unable to comply with the requirements of Section 404 in a timely manner, if we are unable to assert that our internal control over financial reporting is effective, or if our independent registered public accounting firm is unable to express an opinion as to the effectiveness of our internal control over financial reporting, we may be late with the filing of our periodic reports, investors may lose confidence in the accuracy and completeness of our financial reports and the market price of our common stock could be negatively affected. As a result of such failures, we could also become subject to investigations by the stock exchange on which our securities are listed, the SEC, or other regulatory authorities, and become subject to litigation from investors and stockholders, which could harm our reputation, financial condition or divert financial and management resources from our core business, and would have a material adverse effect on our business, financial condition and results of operations.

Our disclosure controls and procedures may not prevent or detect all errors or acts of fraud.

Upon the closing of this offering, we will become subject to the periodic reporting requirements of the Exchange Act. Accordingly, we will be required to design and maintain disclosure controls and procedures to reasonably assure that information we must disclose in reports we file or submit under the Exchange Act is accumulated and communicated to management, and recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC. We believe that any disclosure controls and procedures or internal control over financial reporting, no matter how well-designed and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. For example, our directors or executive officers could inadvertently fail to disclose a new relationship or arrangement causing us to fail to make a required related party transaction disclosure. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people or by an unauthorized override of the controls. Accordingly, because of the inherent limitations in our control system, misstatements due to error or fraud may occur and not be detected.

Raising additional capital may cause dilution to our stockholders, including purchasers of common stock in this offering, restrict our operations or require us to relinquish rights to our technologies or product candidates.

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through equity or debt instruments or other capital sources, including potential collaborations, licenses and other similar arrangements. We do not have any committed external source of funds. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest may be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a common stockholder. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. Such restrictions could adversely impact our ability to conduct our operations and execute our business plan.

If we raise additional funds through future collaborations, licenses and other similar arrangements, we may be required to relinquish valuable rights to our future revenue streams, product candidates, research programs, intellectual property or proprietary technology, or grant licenses on terms that may not be favorable to us and/or that may reduce the value of our common stock. If we are unable to raise additional funds through equity or debt instruments or other arrangements when needed or on terms acceptable to us, we would be required to delay, limit, reduce or terminate our product development or future commercialization efforts, or grant rights to develop and market product candidates that we might otherwise prefer to develop and market ourselves, or on less favorable terms than we would otherwise choose.

We may engage in strategic transactions that could increase our capital requirements, dilute our stockholders, cause us to incur debt or assume contingent liabilities, subject us to other risks, adversely affect our liquidity, increase our expenses and present significant distractions to our management.

Although we currently have no agreements or commitments to complete any such transactions and are not involved in negotiations to do so, from time to time, we may consider strategic transactions, such as acquisitions of companies, asset purchases and out-licensing or in-licensing of intellectual property, products or technologies. Additional potential transactions that we may consider in the future include a variety of business arrangements, including spin-offs, strategic partnerships, joint ventures, restructurings, divestitures, business combinations and investments. We may not be able to find suitable partners or acquisition candidates, and we may not be able to complete such transactions on favorable terms, if at all. Any future transactions could increase our near and long-term expenditures, result in potentially dilutive issuances of our equity securities, including our common stock, or the incurrence of debt, contingent liabilities, amortization expenses or acquired in-process research and development expenses, any of which could affect our financial condition, liquidity and results of operations. Future acquisitions may also require us to obtain additional financing, which may not be available on favorable terms or at all. These transactions may never be successful and may require significant time and attention of our management. In addition, the integration of any business that we may acquire in the future may disrupt our existing business and may be a complex, risky and costly endeavor for which we may never realize the full benefits. Furthermore, we may experience losses related to investments in other companies, including as a result of failure to realize expected benefits or the materialization of unexpected liabilities or risks, which could have a material negative effect on our results of operations and financial

condition. Accordingly, although there can be no assurance that we will undertake or successfully complete any additional transactions of the nature described above, any additional transactions that we do complete could have a material adverse effect on our business, results of operations, financial condition and prospects.

Our ability to use net operating loss carryforwards and other tax attributes may be limited in connection with this offering or other ownership changes.

We have incurred substantial losses during our history, do not expect to become profitable in the near future and may never achieve profitability. To the extent that we continue to generate taxable losses, unused losses will carry forward to offset future taxable income, if any (subject to limitations), until such unused losses expire (if at all). As of December 31, 2025, we also had federal research and development tax credit carryforwards of approximately $0.3 million, which may be carried forward for up to 20 years. As of December 31, 2025, we had net operating loss (“NOL”) carryforwards of approximately $7.2 million for federal income tax purposes and $2.1 million for state income tax purposes. Our federal NOL carryforwards will not expire but may generally only be used to offset 80% of taxable income for a taxable year, which may require us to pay federal income taxes in future years despite generating federal NOL carryforwards in prior years.

In addition, our NOL carryforwards and other tax attributes are subject to review and possible adjustment by the Internal Revenue Service (the “IRS”) and state tax authorities. Furthermore, in general, under Section 382 of the U.S. Internal Revenue Code of 1986, as amended (the “Code”), our federal NOL carryforwards may be or become subject to an annual limitation in the event we have had or have in the future an “ownership change.” For these purposes, an “ownership change” generally occurs if one or more stockholders or groups of stockholders who own at least 5% of a company’s stock increase their ownership by more than 50 percentage points over their lowest ownership percentage within a rolling three-year period. Similar rules may apply under state tax laws. We have not yet determined the amount of the cumulative change in our ownership resulting from this offering or other transactions, or any resulting limitations on our ability to utilize our NOL carryforwards and other tax attributes. However, we believe that our ability to utilize our NOL carryforwards and other tax attributes to offset future taxable income or tax liabilities may be limited as a result of ownership changes, including potential changes in connection with this offering. If we earn taxable income, such limitations could result in increased future income tax liability to us and our future cash flows could be adversely affected. We have recorded a full valuation allowance related to our NOL carryforwards and other deferred tax assets due to the uncertainty of the ultimate realization of the future benefits of those assets.

Inflation could adversely affect our business and results of operations.

Inflation in the United States has increased considerably in the recent years and the impact of geopolitical developments such as the conflicts in Russia and Ukraine, Iran and the Middle East and South America, global supply chain disruptions and changes in regulations and policies, including increased tariffs, continue to increase uncertainty in the outlook of near-term and long-term economic activity, including whether inflation will continue and how long, and at what rate. Increases in inflation raise our costs for commodities, labor, materials and services and other costs required to grow and operate our business, and failure to secure these on reasonable terms may adversely impact our financial condition. Additionally, increases in inflation, interest rate increases and global economic uncertainty may make it more difficult, costly or dilutive for us to secure additional financing. A failure to adequately respond to these risks could have a material adverse impact on our financial condition, results of operations or cash flows.

Business disruptions could seriously harm our future revenue and financial condition and increase our costs and expenses.

Our operations and the operations of our suppliers, CROs, CMOs and clinical sites could be subject to the impact of natural or man-made disasters or business interruptions, which include, but are not limited to, earthquakes, hurricanes, typhoons, floods, water shortages, fires, blizzards and other extreme weather conditions, power outages and telecommunications or infrastructure failure, cybersecurity incidents or physical security breaches, geopolitical conflicts, including war and terrorism, and public health concerns, including pandemics and epidemics, for which we are predominantly self-insured. We rely on third-party manufacturers or suppliers to produce RTN-001 and its components and on CROs and clinical sites to conduct our clinical trials, and do not have a redundant source of supply for all components of our product candidate. Our ability to obtain clinical or, if approved, commercial, supplies of RTN-001 or any future product candidates could be disrupted if the operations of these suppliers were affected by a man-made or

natural disaster or other business interruption, and our ability to commence, conduct or complete our clinical trials in a timely manner could be similarly adversely affected by any of the foregoing. The occurrence of any of these business disruptions could seriously harm our operations and financial condition and increase our costs and expenses.

Our insurance policies are expensive and only protect us from some business risks, which will leave us exposed to significant uninsured liabilities.

We do not carry insurance for all categories of risk that our business may encounter. Some of the policies we currently maintain include property, general liability, clinical trials liability, products liability, transit and storage insurance (including cybersecurity coverage), workers’ compensation and directors’ and officers’ insurance. We do not know, however, if we will be able to maintain insurance with adequate levels of coverage. No assurance can be given that an insurance carrier will not seek to cancel or deny coverage after a claim has occurred. Any significant uninsured liability may require us to pay substantial amounts, which would adversely affect our financial position and results of operations.

We also expect that operating as a U.S. public company will make it more difficult and more expensive for us to maintain director and officer liability insurance, and we may be required to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. As a result, it may be more difficult for us to attract and retain qualified people to serve on our board of directors, on our board committees or as executive officers. We do not know, however, if we will be able to maintain existing insurance with adequate levels of coverage. Any significant uninsured liability may require us to pay substantial amounts, which would negatively affect our business, financial condition and results of operations.

Our business could be affected by litigation, government investigations, and enforcement actions.

From time to time, we may become involved in litigation, government investigations, enforcement actions or other proceedings relating to claims arising from the ordinary course of business or otherwise, in the United States or foreign jurisdictions, including, without limitation, intellectual property, regulatory, product liability, environmental, whistleblower, false claims, privacy, anti-kickback, anti-bribery, securities, commercial, employment, contractual relations with current or past collaborators or licensors and other claims and proceedings which may arise from conducting our business. Any determination that our operations or activities are not in compliance with existing laws or regulations could result in the imposition of fines, civil and criminal penalties, equitable remedies, including disgorgement, injunctive relief and/or other sanctions against us, and remediation of any such findings could have an adverse effect on our business operations.

Legal proceedings, government investigations and enforcement actions can be expensive and time-consuming. An adverse outcome resulting from any such proceedings, investigations or enforcement actions could result in significant damages awards, fines, penalties, exclusion from the federal healthcare programs, healthcare debarment, injunctive relief, product recalls, reputational damage and modifications of our business practices, which could have a material adverse effect on our business, financial condition, results of operations and prospects. Even if such a proceeding, investigation or enforcement action is ultimately decided in our favor, the investigation and defense thereof could require substantial financial and management resources. Litigation initiated by us could also result in counterclaims against us, which could increase the costs associated with the litigation and result in our payment of damages or other judgments against us.

Our internal information technology systems, or those of any of our service providers, may fail or suffer security incidents, loss or leakage of data and other disruptions, which could result in a material disruption of our product development programs, compromise sensitive information related to our business or prevent us from accessing critical information, potentially exposing us to liability or otherwise adversely affecting our business.

We are increasingly dependent upon information technology systems, infrastructure and data to operate our business. In the ordinary course of business, we collect, store and transmit confidential information (including but not limited to intellectual property, proprietary business information and personal information). It is critical that we do so in a secure manner to maintain the confidentiality, availability, and integrity of such confidential information.

Attacks upon information technology systems are increasing in their frequency, levels of persistence, sophistication and intensity, and are often being conducted by sophisticated and organized groups and individuals with a wide range of motives and expertise. These attacks can present meaningful risks to our operations, systems,

and information. We may also face cybersecurity risks due to our reliance on internet technology and the number of our employees and consultants who are working remotely, which may create additional opportunities for security incidents to occur. Furthermore, because the techniques used to conduct attacks upon information technology systems can change frequently and might not be recognized prior to an incident occurring, we may be unable to anticipate these techniques or implement adequate preventative measures. We may also experience security incidents that may remain undetected for an extended period. Even if identified, we may be unable to adequately investigate or remediate incidents or breaches due to the increasing use of tools and techniques that are designed to circumvent controls, avoid detection and remove or obfuscate forensic evidence. It is not possible to prevent all cybersecurity threats to our information technology systems and information and those of our third-party service providers, over which we exert less control, and any controls we implement to do so may prove to be ineffective.

Any security breach or other incident, whether actual or perceived, could impact our reputation and/or operations, cause us to incur significant costs, including legal expenses and remediation costs, harm customer confidence, hurt our expansion into new markets and cause us to lose existing customers. For example, the loss of clinical trial data from clinical trials, or impacts to the availability or integrity of this data, could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any actual or perceived disruption or security incident affects our systems (or those of our third-party collaborators, service providers, contractors or consultants) or were to result in a loss of or accidental, unlawful or unauthorized access to, use of, release of or other processing of, or damage to, our data or applications, or inappropriate disclosure of regulated data or confidential or proprietary information, we could incur liability, the further development and commercialization of RTN-001 or any future product candidates could be delayed, and we could be subject to significant fines, penalties or liabilities for any noncompliance to certain privacy and security laws.

Further, despite the implementation of security measures, our information technology systems and those of our current and any future CROs and other contractors, vendors, consultants and collaborators are vulnerable to breakdown or other damage or interruption from service interruptions, system malfunction, computer viruses, cybersecurity threats (such as ransomware attacks, denial-of-service attacks, cyber-attacks or cyber-intrusions over the Internet, hacking, phishing and other social engineering attacks), unauthorized access or use, natural disasters, terrorism, war and telecommunication and electrical failures. Such information technology systems are additionally vulnerable to security incidents from inadvertent or intentional actions by our employees, contractors, consultants or other third parties. We and certain of our service providers are from time to time subject to cyberattacks and security incidents, and we experienced security incidents in the past and may experience security incidents in the future. If a significant system failure, accident or security incident were to occur, it may cause interruptions in our operations or result in the unauthorized disclosure of or access to personally identifiable information, personal health information, or other regulated data or confidential or proprietary information and result in a material disruption of our development programs and our business operations, whether due to a loss of any potential trade secrets, clinical trial data, or other similar disruptions. The costs related to significant security incidents or disruptions could be material and cause us to incur significant expenses.

We have also outsourced elements of our information technology infrastructure, and as a result a number of third-party vendors may or could have access to our confidential information. If our third-party vendors fail to protect their information technology systems and our confidential and proprietary information, we may be vulnerable to disruptions in service and unauthorized access to our confidential or proprietary information and we could incur liability and reputational damage. If the information technology systems of our third-party vendors and other contractors and consultants become subject to disruptions or security incidents, we may have insufficient recourse against such third parties and we may have to expend significant resources to mitigate the impact of such an event.

Unfavorable global economic conditions, including any adverse macroeconomic conditions, changes in government regulations or geopolitical events, could have serious adverse consequences on our business, financial condition, results of operations or prospects.

The global credit and financial markets have experienced extreme volatility and disruptions, including severely diminished liquidity and credit availability, declines in consumer confidence, declines in economic growth, high inflation and interest rates, increases in unemployment rates and uncertainty about economic stability. The financial markets and the global economy may also be adversely affected by the current or anticipated impact of geopolitical conflict, including in Russia and Ukraine, Iran and the Middle East, South America and other areas, terrorism or other events. Sanctions imposed by the United States and other countries in response to such conflicts may also adversely impact the financial markets and the global economy, and any economic countermeasures by the affected countries or others could exacerbate market and economic instability.

Changes in regulations and policies, including increases in tariffs and countermeasures by affected countries, and the resulting political and economic uncertainty in the United States, may also impact macroeconomic conditions and the global credit and financial markets. The United States has imposed increased tariffs on certain countries, focusing on those with which it has the largest trade deficits. Other countries have responded, and may continue to respond, by announcing retaliatory tariffs on U.S. imports. In addition, the U.S. Department of Commerce initiated national security investigations into the importation of pharmaceuticals and pharmaceutical ingredients pursuant to Section 232 of the Trade Expansion Act of 1962, which could result in the imposition of new tariffs on imports within the pharmaceutical industry. Further, the United States announced a 100% tariff on any branded or patented pharmaceuticals imported into the United States from drug manufacturers that do not have, or are not in the process of building, a manufacturing facility in the United States, which has been delayed as negotiations with large drug manufacturers continue. If we are required to change our current manufacturing partners or suppliers now or in the future in order to avoid such tariffs, the terms of new agreements that we may enter into may not be favorable to us and related operational disruptions may heighten manufacturing and compliance risks and derail commercialization plans. The terms and effects of such tariffs, if and as they are implemented, and other policy changes are uncertain and could have adverse implications on drug pricing, drug production levels and patient access, and may result in supply chain or other operational disruptions.

The United States may also enact other regulations or policies that affect trade or otherwise impact the pharmaceutical industry by restricting U.S. pharmaceutical companies from contracting with certain countries for the development, research or manufacturing of pharmaceutical products. In December 2025, the BIOSECURE Act was signed into law as part of the 2026 National Defense Authorization Act, which restricts U.S. government agencies from purchasing or obtaining certain biotechnology equipment or services from “biotechnology companies of concern” (“BCC”); entering, extending or renewing a contract with any entity using biotechnology equipment or services provided by a BCC to perform a government contract; or granting government funds or loans for such biotechnology equipment or services provided by a BCC. While we do not currently anticipate any material impact on our business and operations, the BIOSECURE Act may have significant implications for U.S. companies with government contracts that obtain biotechnology equipment or services from a BCC, including contracts with the Department of Veterans Affairs, and any related impact on reimbursement under Medicaid and Medicare Part B.

The extent of the impact of geopolitical conflicts, sanctions, increased tariffs and other regulations on our business specifically, or on the U.S. market and global economy generally, are uncertain and unpredictable, and could adversely affect our business, financial condition and results of operations as well as impact our ability to raise capital. There can be no assurance that further deterioration in credit and financial markets and confidence in economic conditions will not occur. Our general business strategy may be adversely affected by any such economic downturn, volatile business environment or continued unpredictable and unstable market conditions. If the current equity and credit markets deteriorate, it may make any necessary debt or equity financing more difficult, more costly and more dilutive. Failure to secure any necessary financing in a timely manner and on favorable terms could have a material adverse effect on our growth strategy, financial performance and stock price and could require us to delay, limit, reduce, or terminate our product development or future commercialization efforts or grant rights to develop and market our product candidates even if we would otherwise prefer to develop and market such product candidates ourselves, or on less favorable terms than we would otherwise choose.

In addition, one or more of our current service providers, manufacturers and other partners may not survive an economic downturn, which could directly affect our ability to attain our clinical development goals on schedule and on budget. Events involving limited liquidity, defaults, non-performance or other adverse developments that affect financial institutions, or concerns or rumors about any events of these kinds or other similar risks, have in the past and may in the future lead to market-wide liquidity problems. If any of the banks that hold our cash deposits were to be placed into receivership, we may be unable to access our cash and cash equivalents, which would adversely affect our business. In addition, if any of the third parties on whom we rely to conduct certain aspects of our preclinical studies or clinical trials are unable to access funds through certain financial institutions, such parties’ ability to fulfill their obligations to us could be adversely affected.

Risks Related to the Development and Regulatory Approval of Our Product Candidate

We currently depend entirely on the success of RTN-001, which is our only product candidate. All completed clinical trials evaluating RTN-001 to date have been conducted by Surface Logix and our ongoing Phase 2b clinical trial is based on clinical data observed from the clinical trials conducted by Surface Logix. If we are unable to advance RTN-001 in clinical development, obtain regulatory approval and ultimately commercialize RTN-001, or experience significant delays in doing so, our business will be materially harmed.

We currently only have one product candidate, RTN-001, the intellectual property for which we have in-licensed and which is being evaluated in a Phase 2b clinical trial. We have invested, and continue to invest, the majority of our efforts and financial resources in the development of RTN-001. All completed clinical trials evaluating RTN-001 to date have been conducted by Surface Logix. Retension has not yet completed any clinical trials for RTN-001 or any other product candidate. Our ongoing Phase 2b clinical trial is based on clinical data observed from the completed clinical trials conducted by Surface Logix. We currently have no products approved for commercial sale or for which regulatory approval to market has been sought. Our business and ability to generate future revenue presently depend entirely on our ability to successfully develop, obtain regulatory approval for and commercialize RTN-001 in a timely manner, and we cannot assure you that we will meet our anticipated timelines for our current or any future clinical trials. This may make an investment in the Company riskier than similar companies that have multiple product candidates in active development and may be able to better sustain the delay or failure of a lead product candidate. In addition, our assumptions about RTN-001 development potential are based on the data generated from preclinical studies and clinical trials conducted by Surface Logix. Furthermore, the small number of patients in the clinical trials conducted by Surface Logix may mean that the results of those trials are not predictive of the outcome of our Phase 2b clinical trial of RTN-001 or of any clinical trials we may conduct in the future. We may be unable to replicate those results and we may observe materially and adversely different results as we conduct our own clinical trials.

RTN-001 will require substantial additional clinical development time, regulatory approval, commercial manufacturing arrangements, the establishment of a commercial organization, significant marketing efforts and further investment before we may generate any revenue from product sales. We cannot assure you that we will meet our timelines for our current or future clinical trials, which may be delayed or not completed for a number of reasons. RTN-001 is susceptible to the risks of failure inherent at any stage of clinical development, including the appearance of unexpected adverse events or failure to achieve the designated endpoints of our clinical trials. Even if RTN-001 is successful in clinical trials, we will not be permitted to market or promote it until we receive regulatory approval from the FDA or comparable foreign regulatory authorities, and we may never receive such regulatory approval to allow us to successfully commercialize RTN-001 or any future product candidates. If we do not receive FDA or comparable foreign regulatory approval with the necessary conditions to allow commercialization, we will not be able to generate revenue from those product candidates in the United States or elsewhere in the foreseeable future, or at all. Any significant delays in obtaining approval for and commercializing our product candidates could adversely affect our business, financial condition, results of operations and prospects.

The success of RTN-001 will depend on several factors, including the following:

•        successful initiation and enrollment of clinical trials and completion of clinical trials with favorable data to support a finding of safety and efficacy for marketing application;

•        acceptance of regulatory submissions by the FDA or comparable foreign regulatory authorities for the conduct of preclinical studies and clinical trials of RTN-001, including any proposed designs of any preclinical studies and clinical trials of RTN-001 and the preclinical studies and clinical trials of RTN-001 conducted by Surface Logix;

•        the frequency and severity of adverse events in preclinical and clinical trials;

•        maintaining relationships with preclinical vendors to ensure successful completion of preclinical studies with favorable results, including toxicology and other studies designed to be compliant with good laboratory practices (“GLP”);

•        maintaining and establishing relationships with CROs, clinical sites and investigators for the clinical development of RTN-001, and ability of such CROs, clinical sites and investigators to comply with clinical trial protocols, current Good Clinical Practices (“cGCPs”) and other applicable requirements;

•        demonstrating the safety and efficacy of RTN-001 to the satisfaction of applicable regulatory authorities, including by establishing a safety database satisfactory to regulatory authorities;

•        receipt and maintenance of marketing approvals from applicable regulatory authorities for the initial and any additional indications;

•        maintaining relationships with third-party manufacturers that are able consistently to comply with current Good Manufacturing Practices (“cGMPs”) as well as making arrangements with our third-party manufacturers for, or establishing our own, commercial manufacturing capabilities at a cost and scale sufficient to support commercialization;

•        establishing sales, marketing and distribution capabilities and launching commercial sales of RTN-001, if and when approved, whether alone or in collaboration with others;

•        obtaining, establishing, maintaining and enforcing patent and any potential trade secret protection or regulatory exclusivity for RTN-001;

•        maintaining an acceptable safety profile of RTN-001 following regulatory approval, if any;

•        maintaining and growing an organization of people who can develop and, if approved, commercialize, market and sell RTN-001; and

•        acceptance of RTN-001, if approved, by patients, the medical community and third-party payors.

If we are unable to develop, receive marketing approval for and successfully commercialize RTN-001, or if we experience delays as a result of any of the above factors or otherwise, our business would be significantly harmed.

Clinical and preclinical development involves a lengthy and expensive process with uncertain timelines and outcomes, and results of prior preclinical studies and clinical trials of RTN-001 or future product candidates are not necessarily predictive of future results. RTN-001 or future product candidates may not achieve favorable results in our preclinical studies or clinical trials or receive regulatory approval on a timely basis, if at all.

Clinical and preclinical development is expensive and can take many years to complete, and its outcome is inherently uncertain. We cannot guarantee that any preclinical studies or clinical trials will be conducted as planned or completed on schedule, if at all, and failure can occur at any time during the trial or study process. Despite promising preclinical or clinical results, any product candidate can unexpectedly fail at any stage of clinical development. The historical failure rate for product candidates in our industry is high, particularly in the earlier stages of development.

The results of preclinical studies and early clinical trials of RTN-001 or any future product candidates may not be predictive of the results of later-stage clinical trials and results in one indication may not be predictive of results to be expected for the same product candidate in another indication. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy characteristics despite having progressed through preclinical studies and initial clinical trials. In addition, differences in trial design between early-stage clinical trials and later-stage clinical trials make it difficult to extrapolate the results of earlier clinical trials to later clinical trials. In particular, prior to our ongoing Phase 2b clinical trial, all preclinical studies and clinical trials conducted using RTN-001 were conducted by Surface Logix. The small number of patients in the clinical trials conducted by Surface Logix may mean that the results of those trials are not predictive of the outcome of our Phase 2b clinical trial of RTN-001 or of any clinical trials we may conduct in the future. The results of Trial 07-05 and Trial 07-08 may not be predictive of the outcome of our Phase 2b dose-ranging trial or our planned Phase 3 clinical trial of RTN-001 due to both the larger patient populations of those clinical trials and the differences in clinical trial design that may be required. As a result, we cannot predict how RTN-001 will perform in ongoing and future clinical trials.

It is not uncommon to observe results in clinical trials that are unexpected based on earlier preclinical studies and clinical trials, and many product candidates fail in clinical trials despite very promising early results. A number of companies in the biopharmaceutical and biotechnology industries have suffered significant setbacks in clinical development even after achieving promising results in earlier studies. Such setbacks have occurred and may occur for many reasons, including, but not limited to: clinical sites and investigators may deviate from clinical trial protocols, whether due to lack of training or otherwise, and we may fail to detect any such deviations in a timely manner; trial patients may fail to adhere to any required clinical trial procedures, including any requirements for post-treatment

follow-up; our product candidates may fail to demonstrate effectiveness or safety in certain patient subpopulations, which has not been observed in earlier trials due to limited sample size, lack of analysis or otherwise; or our clinical trials may not adequately represent the patient populations we intend to treat, whether due to limitations in our trial designs or otherwise, such as where one patient subgroup is overrepresented in the clinical trial. There can be no assurance that we will not suffer similar setbacks despite the data we observed in earlier studies and trials conducted by Surface Logix. Based on negative or inconclusive results, we or any future collaborator may decide, or regulators may require us, to conduct additional preclinical studies or clinical trials, which would cause us to incur additional operating expenses and delays and may not be sufficient to support regulatory approval on a timely basis or at all.

Further, interim data from clinical trials that we may complete are further subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment continues and more patient data become available. Adverse differences between interim, topline, or preliminary data and final data could significantly harm our business prospects. Further, disclosure of interim data by us or by our competitors could result in volatility in the price of our common stock.

In addition, others, including regulatory authorities, may not accept or agree with our assumptions, estimates, calculations, conclusions or analyses or may interpret or weigh the importance of data differently, which could impact the value of the particular program, the approvability or commercialization of the particular product candidate or product and the Company in general. Moreover, the information we choose to publicly disclose regarding a particular study or clinical trial is based on what is typically extensive information, and you or others may not agree with what we determine is material or otherwise appropriate information to include in our disclosure, and any information we determine not to disclose may ultimately be deemed significant with respect to future decisions, conclusions, views, activities or otherwise regarding a particular drug, product candidate or our business. If the interim, topline or preliminary data that we report differ from actual results, or if others, including regulatory authorities, disagree with the conclusions reached, our ability to obtain approval for, and commercialize, RTN-001 and any future product candidates may be harmed, which could harm our business, operating results, prospects or financial condition.

As a result, we cannot be certain that our ongoing and future preclinical studies and clinical trials will be successful. Any safety concerns observed in any one of our clinical trials in our targeted indications could limit the prospects for regulatory approval of RTN-001 in those and other indications, which could have a material adverse effect on our business, financial condition, results of operations and prospects. In addition, even if our clinical trials are successful, product authorization may be delayed or denied for other reasons, including if our manufacturers fail a pre-approval inspection or there are issues relating to cGCP in the conduct of our trials. Any delay or denial of authorization of RTN-001 or any other product candidate could have a material adverse effect on our business, financial condition, results of operations and prospects.

Any difficulties or delays in the commencement or completion, or the termination or suspension, of our ongoing and future clinical trials or preclinical studies could result in increased costs to us, delay or limit our ability to generate revenue or adversely affect our commercial prospects.

Before obtaining marketing approval from regulatory authorities for the sale of RTN-001 or any future product candidates, we must conduct extensive clinical trials to demonstrate the safety and efficacy of the product candidate in humans. Before we can initiate clinical trials for any future product candidates, we must submit the results of preclinical studies to the FDA or comparable foreign regulatory authorities along with other information, including information about product candidate chemistry, manufacturing and controls and our proposed clinical trial protocol, as part of an investigational new drug application (“IND”) or similar regulatory submission. The FDA or comparable foreign regulatory authorities may not grant such an IND or similar regulatory submission or may require us to conduct additional preclinical studies for any product candidate before it allows us to initiate clinical trials under any IND or similar regulatory submission, which may lead to delays and increase the costs of our preclinical development programs. Moreover, even if we commence clinical trials, issues may arise that could cause regulatory authorities to suspend or terminate such clinical trials or require us voluntarily to suspend or terminate such clinical trials. Any such delays in the commencement or completion, or the termination or suspension, of our ongoing and future clinical trials or preclinical studies for RTN-001 and any future product candidate could significantly affect our product development timelines and product development costs.

We do not know whether future clinical trials and preclinical studies will begin on time or if ongoing or future clinical trials and preclinical studies will be completed on schedule, if at all. The commencement, data readouts and completion of clinical trials and preclinical studies can be delayed for a number of reasons, including delays related to:

•        inability to collect materials to initiate and generate sufficient preclinical data to support the initiation or continuation of clinical trials;

•        obtaining allowance from regulatory authorities to commence a trial or reaching a consensus with regulatory authorities on trial design;

•        the FDA or comparable foreign regulatory authorities disagreeing as to the design or implementation of our clinical trials;

•        any failure or delay in reaching an agreement with CROs and clinical trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

•        delays in identifying, recruiting and training suitable clinical investigators;

•        obtaining approval from one or more institutional review boards (“IRBs”) or ethics committees (“ECs”) or Data Safety Monitoring Boards (“DSMBs”) at clinical trial sites;

•        IRBs, ECs or DSMBs refusing to advance or approve, suspending or terminating the trial at an investigational site, precluding enrollment of additional patients or withdrawing their approval of the trial;

•        changes or amendments to the clinical trial protocol;

•        clinical sites deviating from the trial protocol or dropping out of a trial;

•        failure by our CROs to perform in accordance with cGCP requirements or other applicable regulatory requirements in the United States or in other countries;

•        obtaining raw materials for manufacturing sufficient quantities of RTN-001 or obtaining sufficient quantities of combination therapies or other materials needed for use in clinical trials and preclinical studies;

•        obtaining adequate materials for packaging clinical trial material;

•        expiration of the shelf life of clinical material for use in clinical trials prior to the enrollment of any of our clinical trials;

•        patients failing to enroll or remain in our trials at the rate we expect, or failing to return for post-treatment follow-up;

•        individuals choosing an alternative product for the indications for which we are developing RTN-001 or any future product candidates, or participating in competing clinical trials;

•        lack of adequate funding to continue the clinical trials, preclinical studies, manufacturing or incurring greater costs than we anticipate;

•        patients experiencing severe or serious unexpected drug-related adverse effects;

•        occurrence of SAEs in trials of the same class of agents conducted by other companies that could be considered similar to RTN-001 or any future product candidates;

•        clinical trials with clinical endpoints that require prolonged periods of clinical observation or extended analysis of the resulting data;

•        transfer of manufacturing processes to larger-scale facilities operated by a contract manufacturing organization (“CMO”), delays or failure by our CMOs or us to make any necessary changes to such manufacturing process, or failure of our CMOs to produce clinical trial materials in accordance with cGMP regulations or other applicable requirements; and

•        third parties being unwilling or unable to satisfy their contractual obligations to us in a timely manner.

Clinical trials must be conducted in accordance with FDA requirements and other applicable regulatory authorities’ legal requirements, regulations or guidelines, and are subject to oversight by these governmental agencies and ECs, DSMBs or IRBs at the medical institutions where the clinical trials are conducted. We could also encounter delays if a clinical trial is suspended or terminated by us, by the IRBs of the institutions in which such trials are being conducted, by a DSMB for such trial or by the FDA or comparable foreign regulatory authorities. Such authorities may impose such a suspension or termination due to a number of factors, including failure to conduct the clinical trial in accordance with GCP and other regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or comparable foreign regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a drug, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial.

Further, conducting clinical trials in foreign countries, as intended to be done in the future for RTN-001 and for any future product candidates, presents additional risks that may delay completion of our clinical trials. These risks include the failure of enrolled patients in foreign countries to adhere to clinical protocols as a result of differences in healthcare services or cultural customs, managing additional administrative burdens associated with foreign regulatory schemes and political and economic risks, including geopolitical conflicts, relevant to such foreign countries.

Moreover, principal investigators for our clinical trials may serve as scientific advisors or consultants to us from time to time and receive compensation in connection with such services. Under certain circumstances, we may be required to report some of these relationships to the FDA or comparable foreign regulatory authorities. The FDA or comparable foreign regulatory authority may conclude that a financial relationship between us and a principal investigator has created a conflict of interest or otherwise affected interpretation of the trial. The FDA or comparable foreign regulatory authority may therefore question the integrity of the data generated at the applicable clinical trial site and the utility of the clinical trial itself may be jeopardized. This could result in a delay in approval, or rejection, of our marketing applications by the FDA or comparable foreign regulatory authority, as the case may be, and may ultimately lead to the denial of marketing approval of one or more of our product candidates.

In addition, many of the factors that cause, or lead to, the termination or suspension of, or a delay in the commencement or completion of, clinical trials may also ultimately lead to the denial of regulatory approval of a product candidate. We may make formulation or manufacturing changes to RTN-001 or any future product candidates, in which case we may need to conduct additional preclinical studies or clinical trials to bridge our modified product candidates to earlier versions. Any resulting delays to our clinical trials could shorten any period during which we may have the exclusive right to commercialize our product candidates. In such cases, our competitors may be able to bring products to market before we do, and the commercial viability of RTN-001 or any future product candidates could be significantly reduced. Any of these occurrences may harm our business, financial condition and prospects.

The regulatory approval processes of the FDA and comparable foreign regulatory authorities are lengthy, time consuming and inherently unpredictable, and if we are ultimately unable to obtain regulatory approval for RTN-001 or any of our future product candidates or obtain limited regulatory approval, our business will be substantially harmed.

RTN-001 and any future product candidates we develop will be subject to extensive governmental regulations relating to research, testing, development, manufacturing, approval, recordkeeping, reporting, labeling, storage, packaging, advertising and promotion, pricing, post-approval monitoring, marketing, sale and distribution of products. Rigorous preclinical studies, clinical trials and an extensive regulatory approval process are required to be completed successfully in the United States and in many foreign jurisdictions before a new product may be marketed. Satisfaction of these and other regulatory requirements is costly, time-consuming, uncertain and subject to unanticipated delays. It is possible that none of our product candidates will obtain the regulatory approvals necessary for us to begin selling them and any delay or failure in obtaining required approvals could adversely affect our ability to generate revenue from the particular product candidate for which we are seeking approval.

The time required to obtain approval by the FDA and comparable foreign regulatory authorities is unpredictable but typically takes many years following the commencement of clinical trials and depends upon numerous factors, including the discretion of the regulatory authorities. We have not obtained regulatory approval for any product candidate and it is possible that any product candidates we may seek to develop in the future will never obtain regulatory approval. Neither we nor any future collaborator is permitted to market any of our product candidates in

the United States or elsewhere until we receive regulatory approval of our product candidates through an NDA from the FDA or similar marketing application in another jurisdiction. The FDA and other comparable foreign regulatory authorities may delay, limit or deny approval of our product candidates for many reasons, including:

•        we may not be able to demonstrate to the satisfaction of the FDA or other comparable foreign regulatory authorities that any of our product candidates are safe and effective for any indication;

•        the results of clinical trials may not meet the level of statistical significance or clinical significance required by the FDA or comparable foreign regulatory authorities for approval;

•        the FDA or comparable foreign regulatory authorities may disagree with the number, design, size, conduct or implementation of our clinical trials;

•        the FDA or comparable foreign regulatory authorities may not find the data from preclinical studies and clinical trials sufficient to demonstrate that the benefits of any of our product candidates outweigh their safety risks;

•        the FDA or comparable foreign regulatory authorities may disagree with our interpretation of data from preclinical studies or clinical trials, or may not accept data generated at our clinical trial sites;

•        the data collected from preclinical studies and clinical trials of any of our product candidates may not be sufficient to support the submission of an IND, Clinical Trial Application (“CTA”) or other application for regulatory approval;

•        the FDA may have difficulty scheduling an advisory committee meeting in a timely manner, or the advisory committee may recommend against approval of our application or may recommend that the FDA require, as a condition of approval, additional preclinical studies or clinical trials, limitations on approved labeling or distribution and use restrictions;

•        the FDA may require development of a risk evaluation and mitigation strategy (“REMS”) and foreign regulatory authorities may require a risk management plan (“RMP”) as a condition of approval for new products, among other additional requirements;

•        the FDA or comparable foreign regulatory authorities may identify deficiencies in the manufacturing processes or facilities of third-party manufacturers with which we enter into agreements for clinical and commercial supplies;

•        the FDA or comparable foreign regulatory authorities may change their approval policies or adopt new regulations; and

•        the FDA or comparable foreign regulatory authorities may require simultaneous approval for both adults and for children and adolescents, which may delay approval, or we may have successful clinical trial results for adults but not children and adolescents, or vice versa.

Any of these regulatory authorities may also change the requirements for the approval of a product candidate even after reviewing and providing comments or advice on a protocol for a clinical trial. The FDA or comparable foreign regulatory authorities may require that we conduct additional preclinical, clinical, manufacturing validation or drug product quality studies and submit those data before considering or reconsidering the application. Depending on the extent of these or any other studies, approval of any applications that we submit may be delayed by several years or may require us to expend more resources than we have available. It is also possible that additional studies, if performed and completed, may not be considered sufficient by the FDA or comparable foreign regulatory authorities for granting approval.

In addition, the FDA or comparable foreign regulatory authorities may approve a product candidate for fewer or narrower indications than we request, may impose significant limitations related to use restrictions for certain age groups, warnings, precautions or contraindications or may grant approval contingent on the performance of costly post-marketing clinical trials or risk mitigation requirements, such as the implementation of a REMS, RMP or comparable foreign risk management approaches. The FDA or comparable foreign regulatory authorities may not accept the labeling claims that we believe would be necessary or desirable for the successful commercialization of our product candidates.

Further, the FDA or comparable foreign regulatory authorities may respond to any NDA or comparable marketing application that we may submit by defining requirements that we do not anticipate. Such responses could delay clinical development of any of our product candidates or any future product candidates.

We are also subject to numerous foreign regulatory requirements governing the conduct of clinical trials, manufacturing and marketing authorization, pricing and third-party reimbursement, and may in the future become subject to additional ones. The regulatory approval process varies among countries and may include all of the risks associated with the FDA approval process described above, as well as risks attributable to the satisfaction of local regulations in foreign jurisdictions. Moreover, the time required to obtain approval in foreign jurisdictions may differ from that required to obtain FDA approval. FDA approval does not ensure approval by regulatory authorities outside the United States and vice versa. Any delay or failure to obtain U.S. or foreign regulatory approval for a product candidate could have a material and adverse effect on our business, financial condition, results of operations and prospects.

We may find it difficult to enroll patients in our clinical trials. If we encounter difficulties or delays enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

Successful and timely completion of clinical trials will require that we identify and enroll a specified number of patients for each of our clinical trials. We may not be able to initiate or continue clinical trials of RTN-001 or any future product candidates if we are unable to identify and enroll a sufficient number of eligible trial patients to participate in these trials as required by the FDA or similar regulatory authorities outside the United States. Patient enrollment, a significant factor in the timing of clinical trials, is affected by many factors, including the size and characteristics of the patient population, the proximity of patients to clinical sites, the eligibility and exclusion criteria for the trial, the design of the clinical trial, the ability to obtain and maintain informed consents, the risk that enrolled patients will not complete a clinical trial, our ability to recruit clinical trial investigators with the appropriate competencies and experience and competing clinical trials and clinicians’ and patients’ perceptions as to the potential advantages and risks of the product candidate being studied in relation to other available therapies, including any new products that may be approved for the indications we are investigating as well as any product candidates under development. We will be required to identify and enroll a sufficient number of patients for each of our clinical trials and monitor such patients adequately during and after treatment. Potential patients for any planned clinical trials may not be adequately diagnosed or identified with the diseases that we are targeting, which could adversely impact the outcomes of our trials and could have safety concerns for the potential patients. Potential patients for any planned clinical trials may also not meet the entry criteria for such trials.

Additionally, other pharmaceutical companies targeting these same diseases are recruiting clinical trial patients from these patient populations, which may make it more difficult to fully enroll our clinical trials. We may not be able to initiate or continue clinical trials if we are unable to locate a sufficient number of eligible patients to participate in the clinical trials required by the FDA or comparable foreign regulatory authorities. In addition, the process of finding and recruiting patients may prove costly. The timing of our clinical trials depends, in part, on the speeds at which we can recruit patients to participate in our trials, as well as completion of required follow-up periods. The eligibility criteria of our clinical trials, once established, may further limit the pool of available trial participants. If patients are unwilling or unable to participate in our trials for any reason, including the existence of concurrent clinical trials for similar target populations, the availability of approved or authorized therapies, the impact of any public health concerns or the fact that enrolling in our trials may prevent patients from taking a different product, or we otherwise have difficulty enrolling a sufficient number of patients, the timeline for recruiting patients, conducting trials and obtaining regulatory approval of our product candidates may be delayed. Our inability to enroll a specified number of patients for any of our future clinical trials would result in significant delays or may require us to abandon one or more clinical trials altogether. In addition, we rely on, and will continue to rely on, CROs and clinical trial sites to ensure proper and timely conduct of our clinical trials and preclinical studies. Though we have entered into agreements governing their services, we will have limited influence over their actual performance.

We cannot assure you that our assumptions used in determining expected clinical trial timelines are correct or that we will not experience delays or difficulties in enrollment, or be required by the FDA or other regulatory authorities to increase our enrollment, which would result in the delay of completion of such trials beyond our expected timelines.

Use of RTN-001 or any future product candidates could be associated with adverse side effects, adverse events or other properties or safety risks, which could delay or preclude regulatory approval, cause us to suspend or discontinue clinical trials, abandon a product candidate, limit the commercial profile of an approved label or result in other significant negative consequences that could severely harm our business, prospects, operating results and financial condition.

As is the case with biopharmaceuticals generally, there may be adverse side effects associated with RTN-001 or any future product candidates’ use. Results of our clinical trials could reveal a high and unacceptable severity and prevalence of expected or unexpected side effects or unexpected characteristics. Undesirable side effects caused by our product candidates when used alone or in combination with approved or investigational drugs could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label, or lead to the delay or denial of regulatory approval by the FDA or comparable foreign regulatory authorities. The drug-related side effects could affect patient recruitment or the ability of enrolled patients to complete the trial or result in potential product liability claims. Any of these occurrences could severely harm our business, prospects, operating results and financial condition.

Moreover, if RTN-001 or any future product candidates are associated with undesirable side effects in clinical trials or demonstrate characteristics that are unexpected, we may elect to abandon their development or limit their development to more narrow uses or subpopulations in which the undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective, which may limit the commercial expectations for the product candidate if approved. We may also be required to modify our development and clinical trial plans based on findings in our ongoing or future clinical trials. Many compounds that initially showed promise in early-stage testing have later been found to cause side effects that prevented further development of the compounds.

It is possible that as we test RTN-001 or any future product candidates in larger, longer and more extensive clinical trials, including with different dosing regimens, or as the use of these product candidates becomes more widespread following any regulatory approval, more illnesses, injuries, discomforts and other adverse events than were observed in earlier trials, as well as new conditions that did not occur or went undetected in previous trials, may be discovered. If such side effects become known later in development or upon approval, if any, such findings may harm our business, financial condition and prospects significantly.

In addition, if RTN-001 or any future product candidates receive marketing approval, and we or others later identify undesirable side effects caused by such product, a number of potentially significant negative consequences could result, including:

•        regulatory authorities may withdraw, suspend or limit approvals of such product, or seek an injunction against its manufacture or distribution;

•        we may be required or determine it is necessary to recall a product or seek to change the way such product is administered to patients;

•        regulatory authorities may require additional warnings on the label, such as a “black box” warning or a contraindication;

•        we may be required to change the way a product is distributed or administered, conduct additional clinical trials or change the labeling of a product or be required to conduct additional post-marketing studies or surveillance;

•        we could be sued and held liable for harm caused to patients;

•        sales of the product may decrease significantly or the product could become less competitive; and

•        our reputation may suffer.

Any of these events could prevent us from achieving or maintaining market acceptance of the particular product candidate, if approved, and could significantly harm our business, financial conditions, results of operations and prospects.

Several of the clinical trials for RTN-001 have been conducted outside of the United States, and we intend to conduct clinical trials for RTN-001 outside of the United States. However, the FDA and other comparable foreign regulatory authorities may not accept data from such trials, in which case our development plans will be delayed, which could materially harm our business.

Several of the clinical trials for RTN-001 have been conducted outside of the United States by Surface Logix, including the two Phase 2 pilot trials evaluating RTN-001 for the treatment of hypertension, which were conducted in the United Kingdom (the “UK”) and Germany. We also intend to conduct clinical trials for RTN-001 outside of the United States. The acceptance of data from clinical trials conducted outside of the United States or another jurisdiction by the FDA or comparable foreign regulatory authorities may be subject to certain conditions or may not be accepted at all. In cases where data from foreign clinical trials are intended to serve as the sole basis for marketing approval in the United States, the FDA will generally not approve the application on the basis of foreign data alone unless (i) the trial population adequately represents the U.S. population and the data are applicable to the U.S. population and U.S. medical practice in ways that the FDA deems clinically meaningful; (ii) the trials were performed by clinical investigators of recognized competence and pursuant to GCP regulations; and (iii) the data may be considered valid without the need for an on-site inspection by the FDA, or if the FDA considers such inspection to be necessary, the FDA is able to validate the data through an on-site inspection or other appropriate means. In addition, even where the foreign trial data are not intended to serve as the sole basis for approval, the FDA will not accept the data as support for an application for marketing approval unless the trial is well-designed and well-conducted in accordance with GCP requirements and the FDA is able to validate the data from the trial through an onsite inspection if deemed necessary. While data from clinical trial sites in countries outside of the United States will not serve as the sole basis for FDA approval, any foreign data we use as part of any NDA submission will be subject to the foregoing FDA requirements and standards. Many foreign regulatory authorities have similar approval requirements. There can be no assurance that the FDA or any comparable foreign regulatory authority will accept data from trials conducted outside of the United States or the applicable jurisdiction. If the FDA or any comparable foreign regulatory authority does not accept such data, it would result in the need for additional trials, which could be costly and time-consuming, and which may result in current or future product candidates that we may develop not receiving approval for commercialization in the applicable jurisdiction. In addition, such foreign trials would be subject to the applicable local laws of the foreign jurisdictions where the trials are conducted, which may increase costs or time required to complete the clinical trial.

Conducting clinical trials outside the United States also exposes us to additional risks, including risks associated with:

•        differing regulatory requirements in foreign countries;

•        differing standards with respect to data integrity or failure to observe local or international GCPs, including data integrity, rules leading to rejection of safety or effectiveness data by regulatory authorities;

•        differing standards and privacy requirements for the conduct of clinical trials;

•        increased difficulties in managing the logistics and transportation of storing and shipping product candidates to the patient at the relevant trial site abroad;

•        foreign exchange fluctuations or restrictions on transfer of funds;

•        compliance with foreign manufacturing, customs, import/export, taxes and tariffs, shipment and storage requirements;

•        inconsistent standards for reporting and evaluating clinical data and adverse events;

•        diminished protection of intellectual property in some countries;

•        difficulties staffing, workforce uncertainty and managing foreign operations;

•        differing payor reimbursement regimes, governmental payors or patient self-pay systems and price controls;

•        political instability, civil unrest, war, economic weakness or similar events that may jeopardize our ability to commence, conduct or complete a clinical trial and evaluate resulting data; and

•        business interruptions resulting from any public health concerns, including pandemics or epidemics, or natural or man-made disasters, including, but not limited to, earthquakes, hurricanes, typhoons, floods, water shortages, fires, blizzards and other extreme weather conditions, power outages and telecommunications or infrastructure failure, cybersecurity incidents or physical security breaches.

Changes in methods of product manufacturing or formulation may result in additional costs or delays.

As product candidates progress through clinical trials to marketing approval and commercialization, it is common that various aspects of the development program, such as manufacturing methods and formulation, are altered along the way in an effort to optimize safety, efficacy, yield and manufacturing batch size, minimize costs and achieve consistent quality and results. There can be no assurance that such changes will achieve these intended objectives. For example, all completed clinical trials of RTN-001, other than Trial 09-09, which was the Phase 1 Study of RTN-001 modified release (“Trial 09-09”), were conducted using an immediate release form of RTN-001. Our Phase 2b clinical trial for the treatment of uHTN to further assess the safety and efficacy of RTN-001 is being conducted with a modified release formulation of RTN-001, as opposed to the immediate release form that was evaluated in most prior clinical trials. These changes and any future changes we may make to RTN-001 or any future product candidates may also cause such candidates to perform differently and affect the results of future clinical trials conducted with the altered materials. Such changes or related unfavorable clinical trial results could delay initiation or completion of clinical trials, require the conduct of bridging studies or clinical trials or the repetition of one or more studies or clinical trials, increase development costs, delay or prevent potential marketing approval and jeopardize our ability to commercialize RTN-001 or any future product candidates, if approved, and generate revenue.

The manufacturing process for any products that we may develop is subject to the FDA or comparable foreign regulatory authority approval process, and we must therefore contract with manufacturers who can meet our and all applicable FDA or comparable foreign regulatory authority requirements on an ongoing basis.

The manufacturing process for any products that we may develop is subject to the FDA or comparable foreign authority approval process, and any CMOs with whom we forge contracts must meet all applicable FDA or comparable foreign regulatory authority requirements on an ongoing basis. If we or our CMOs are unable to reliably produce products in accordance with GMPs and to specifications acceptable to the FDA or comparable foreign regulatory authorities, we may not obtain or maintain the approvals we need to commercialize such products. Even if we obtain regulatory approval for any of our product candidates, there is no assurance that either we or our CMOs will be able to manufacture the approved product in accordance with requirements from the FDA or comparable foreign regulatory authorities to produce it in sufficient quantities to meet the requirements for the potential launch of the product or to meet potential future demand. Our manufacturing activities are subject to ongoing, unannounced inspections by the FDA and comparable regulatory authorities. Any of these challenges could delay completion of clinical trials, require bridging clinical trials or the repetition of one or more clinical trials, increase clinical trial costs, result in sanctions being imposed on us (including clinical holds, fines, injunctions, civil penalties, delays, suspension or withdrawal of approvals, license revocation, suspension of production or recalls of the product candidates, operating restrictions and criminal prosecutions), delay approval of our product candidates, impair commercialization efforts or increase our cost of goods, any of which would have an adverse effect on our business, financial condition, results of operations and prospects. Our future success depends on our ability to manufacture our products on a timely basis with acceptable manufacturing costs, while at the same time maintaining good quality and complying with applicable regulatory requirements. An inability to do so could have a material adverse effect on our business, financial condition, results of operations and prospects. In addition, we could incur higher manufacturing costs if manufacturing processes or standards change, and we could need to replace, modify, design, build or install equipment, all of which would require additional capital expenditures.

Should we continue to use CMOs, we may not succeed in maintaining our relationships with our current CMOs or establishing relationships with additional or alternative CMOs. RTN-001 or any future product candidate may compete with other products and product candidates for access to manufacturing facilities. If our CMOs were to cease manufacturing for us, we would experience delays in obtaining sufficient quantities of RTN-001 or any future product candidates for clinical trials and, if approved, commercial supply. Further, our CMOs may breach, terminate or not renew these agreements. If we were to need to find alternative manufacturing facilities, it would significantly reduce our ability to develop, obtain regulatory approval for or market RTN-001 or any future product candidate, if approved. The commercial terms of any new arrangement could be less favorable than our existing arrangements and the expenses relating to the transfer of necessary technology and processes could be significant, as would be the time required to effect a satisfactory, compliant transfer of the manufacturing process to a new CMO.

Moreover, if we are unable to manufacture or contract for a sufficient supply of RTN-001 and any future product candidates on acceptable terms, or if we encounter delays or difficulties in the scale-up of our manufacturing processes, our preclinical and human clinical testing schedule would be delayed. This in turn would delay the submission of RTN-001 and any future product candidates for regulatory approval and thereby delay the market introduction and subsequent sales

of any products that receive regulatory approval, which would have a material adverse effect on our business, financial condition, results of operations and prospects. In addition, if RTN-001 or any future product candidates are approved for sale, our inability to manufacture or contract for a sufficient supply of such potential future products on acceptable terms would have a material adverse effect on our business, financial condition, results of operations and prospects.

Even to the extent we use and continue to use CMOs, we are ultimately responsible for the manufacture of RTN-001 and any future product candidates. A failure to comply with these requirements may result in regulatory enforcement actions against our manufacturers or us, including fines, injunctions and other civil and criminal penalties, which could result in imprisonment, suspension or restrictions of production, injunctions, delay or denial of product approval or supplements to approved products, clinical holds or termination of clinical trials, warning or untitled letters, regulatory authority communications warning the public about safety issues with the product, refusal to permit the import or export of the product, product seizure, detention, recall, operating restrictions, suits under the federal Civil False Claims Act, 31 U.S.C. 3729 et. seq. (“FCA”), corporate integrity agreements, consent decrees or withdrawal of product approval.

Disruptions at the FDA and other government agencies caused by workforce reductions and reorganization initiatives, funding shortages, prolonged shutdowns, global health developments or concerns could hinder their ability to hire, retain or deploy key leadership and other personnel, or otherwise prevent new or modified products from being developed, approved or commercialized in a timely manner or at all, which could negatively impact our business.

The ability of the FDA and other government agencies to review and approve products can be affected by a variety of factors, including government budget and funding levels, statutory, regulatory and policy changes, a government agency’s ability to hire and retain key personnel and accept the payment of user fees and other events that may otherwise affect the government agency’s ability to perform routine functions. Average review times at the FDA and other government agencies have fluctuated in recent years as a result. Significant workforce reductions and reorganizations at several U.S. health agencies, including the FDA, the HHS, the Centers for Disease Control and Prevention and the National Institutes of Health, have impacted, and may continue to impact, the FDA’s ability to review and approve new medicines and conduct necessary inspections. In addition, government funding of other government agencies that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable. Disruptions at the FDA and other agencies may also slow the time necessary for new drugs or modifications to approved drugs to be reviewed and/or approved by necessary government agencies, which would adversely affect our business. For example, over the last several years, the U.S. government has shut down several times and certain regulatory agencies, such as the FDA, have experienced substantial fundings cuts and have had to furlough employees and pause or delay critical activities. In addition, regulatory priorities and enforcement initiatives continue to shift, including programs that alter FDA review focus and timelines and increase enforcement activity, which could lead to unexpected delays or changes in review criteria. Such policy changes can be sudden and unexpected and we may experience increased costs to monitor for such changes and respond to any new requirements affecting our business and operations.

We may attempt to seek approval from the FDA for one or more of our product candidates through the use of the accelerated approval pathway. If we are unable to obtain such approval, we may be required to conduct additional clinical trials beyond those that we contemplate, which could increase the expense of obtaining, and delay the receipt of, necessary marketing approvals. Even if we receive accelerated approval from the FDA, if our confirmatory trials do not verify clinical benefit, or if we do not comply with rigorous post-marketing requirements, the FDA may seek to withdraw any accelerated approval we have obtained.

We may in the future seek an accelerated approval for one or more of our product candidates. Under the accelerated approval pathway, the FDA may approve a product candidate for a serious or life-threatening disease or condition with unmet medical need based on a determination that the product has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit. Products granted accelerated approval are subject to certain post-marketing requirements, which typically include a requirement to conduct one or more post-approval studies to confirm the clinical benefit of the product. In addition, during the pre-approval review period, FDA regulations require that sponsors of products granted accelerated approval submit copies of all promotional materials intended to be used within 120 days following marketing approval. After 120 days following marketing approval, unless otherwise informed by the FDA, the sponsor must submit all promotional materials at least 30 days prior to use. There can be no assurance that we will be able to use the accelerated approval pathway or any other form of expedited development, review or approval for any of our product candidates.

For example, the FDA may not agree with our conclusion that an endpoint we select is reasonably likely to predict clinical benefit, and thus the FDA may not agree that accelerated approval is appropriate based on that endpoint (even if the results on that endpoint are statistically significant). Also, if any of our competitors were to receive full approval for an indication for which we are seeking accelerated approval before we receive accelerated approval for any one of our product candidates, the indication we are seeking may no longer qualify as a condition for which there is an unmet medical need, and our product candidate may become ineligible for accelerated approval.

A failure to obtain accelerated approval would result in a longer time period to commercialize such product candidate and increase the cost of development of such product candidate and could harm our competitive position in the marketplace. Even if we are able to obtain accelerated approval, if we do not complete the required post-approval studies, or if the FDA determines that the completed post-approval studies do not confirm clinical benefit, then the FDA may withdraw approval of our product using expedited procedures.

We may seek a Breakthrough Therapy or Fast Track designation for current or future product candidates, but we might not receive such designation, and even if we do, we may not maintain such designation. Such designation may not lead to faster development, regulatory review or approval, and will not increase the likelihood that the product candidate will receive marketing approval.

We may seek a Breakthrough Therapy or Fast Track designation for our current or future product candidates. A Breakthrough Therapy is defined as a drug or biologic that is intended, alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the drug or biologic may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. For drugs or biologics that have been designated as Breakthrough Therapies, interaction and communication between the FDA and the sponsor of the trial can help to identify the most efficient path for clinical development while minimizing the number of patients placed in ineffective control regimens. Drugs or biologics designated as Breakthrough Therapies by the FDA may also be eligible for priority review if supported by clinical data at the time the NDA or BLA is submitted to the FDA. The FDA also has a Fast Track program that is intended to expedite or facilitate the process for reviewing new drugs and biological products that meet certain criteria. New drugs and biological products are eligible for Fast Track designation if they are intended to treat a serious or life-threatening condition and preclinical or clinical data demonstrate the potential to address unmet medical needs for the disease or condition. Fast Track designation applies to the combination of the product and the specific indication for which it is being studied.

The FDA has broad discretion whether or not to grant Breakthrough Therapy or Fast Track designation to any product candidate. Accordingly, even if we believe that a product candidate meets the criteria for designation as a Breakthrough Therapy or a Fast Track designation, the FDA may disagree and instead determine not to make such a designation. Even if we receive a Breakthrough Therapy or Fast Track designation, the receipt of such designation may not result in a faster development or regulatory review or approval process compared to drugs considered for approval under conventional FDA procedures and does not assure ultimate approval by the FDA. In addition, even if a product candidate qualifies as a Breakthrough Therapy or for the Fast Track program, the FDA may later decide that it no longer meets the conditions for qualification or decide that the time period for FDA review or approval will not be shortened. The failure to obtain a Breakthrough Therapy or Fast Track designation for any product candidates we may develop, or the inability to maintain that designation for the duration of the applicable period, could reduce our ability to make sufficient sales of the applicable product candidate to balance our expenses incurred to develop it, which would have a negative impact on our operational results and financial condition.

If we do not achieve our projected development goals in the timeframes we announce and expect, the commercialization of our programs may be delayed and our expenses may increase and, as a result, our stock price may decline.

From time to time, we estimate the timing of the anticipated accomplishment of various scientific, clinical, regulatory and other product development goals, which we sometimes refer to as milestones. These milestones may include the commencement or completion of scientific studies and clinical trials, as well as the submission of regulatory filings. From time to time, we may publicly announce the expected timing of some of these milestones. All of these milestones are and will be based on numerous assumptions, including:

•        our available capital resources or capital constraints we experience;

•        the rate of progress, costs and results of our clinical trials and research and development activities, including the extent of scheduling conflicts with participating clinicians and collaborators;

•        our ability to identify and enroll patients who meet clinical trial eligibility criteria;

•        our receipt of approvals by the FDA and comparable foreign regulatory authorities and the timing thereof;

•        other actions, decisions or rules issued by regulators;

•        our ability to access sufficient, reliable and affordable supplies of materials used to manufacture RTN-001 and any future product candidates;

•        the securing of, costs related to and timing issues associated with, product manufacturing as well as sales and marketing activities; and

•        securing product reimbursement.

The actual timing of these milestones can vary dramatically compared to our estimates, in some cases for reasons beyond our control. If we do not meet these milestones as publicly announced, or at all, the commercialization of our programs may be delayed or never achieved and, as a result, our stock price may decline. Additionally, delays relative to our projected timelines are likely to cause overall expenses to increase, which may require us to raise additional capital sooner than expected and prior to achieving targeted development milestones.

Risks Related to Our Intellectual Property

We rely on an exclusive sublicense with Kadmon, a wholly-owned subsidiary of Sanofi (through our sublicense agreement with Redux), as well as upstream licenses to provide us with intellectual property rights to develop and commercialize RTN-001. If any of the sublicense or license agreements are terminated or if our licensors do not act in our best interest, we could lose our rights to develop and commercialize RTN-001.

We rely on the Historical Agreements to provide us with intellectual property rights to develop and commercialize RTN-001. The rights and obligations granted to the Company under the Redux Agreement were originally granted by Kadmon under the Kadmon Agreement, and to Kadmon based on certain upstream transactions and licenses. If either the Redux Agreement or the Kadmon Agreement is terminated, we would lose our rights to develop and commercialize RTN-001, which in turn would have a material adverse effect on our business, financial condition, results of operations and prospects, including, but not limited to, cessation of our operations to the extent we are unable to develop other product candidates at the time of such termination.

Similarly, Kadmon obtained the relevant rights related to RTN-001 based on upstream licenses and transactions. Any breach or termination of these arrangements may also result in our no longer having rights to the applicable intellectual property and/or impairment of our ability to continue to develop and commercialize RTN-001. Such events would have a material adverse effect on our business, financial condition, results of operations and prospects, including, but not limited to, cessation of our operations to the extent we are unable to develop other product candidates at the time of such termination.

Additionally, if our licensors fail to adequately protect our licensed intellectual property, our ability to commercialize RTN-001 or any future product candidates could suffer. We do not have complete control over the maintenance, prosecution and litigation of our in-licensed patents and patent applications and may have limited control over future intellectual property that may be in-licensed. For example, we cannot be certain that activities such as the maintenance and prosecution by our licensors have been or will be conducted in compliance with applicable laws and regulations or will result in valid and enforceable patents and other intellectual property rights. It is possible that our licensors’ infringement proceedings or defense activities may be less vigorous than had we conducted them ourselves or may not be conducted in accordance with our best interests. For additional information, see “Business — Intellectual Property — Key Agreements”.

If the crystalline polymorph patent covering RTN-001 is determined to be subject to the royalty obligations under the Historical Agreements or if a dispute arises regarding inventorship and/or ownership of the patent, our revenue and profitability from the commercialization of RTN-001 will be materially impacted.

Under the Historical Agreements, we currently license a U.S. composition of matter patent covering RTN-001, which is set to nominally expire in 2027. The Historical Agreements pursuant to which we obtained the intellectual property rights, including the rights to the patent portfolio covering RTN-001 and related compounds to develop

and commercialize RTN-001, are complex and involve multiple parties. Section 9.1(c) of the Kadmon Agreement provides, among other things, that United States patent law will determine inventorship of any inventions arising under the Kadmon Agreement and that if the named inventors are solely employees or agents of Redux or its affiliates, such invention shall be owned by Redux. Section 2.1 of the Redux Agreement incorporates by reference Section 9.1(c) of the Kadmon Agreement, such that when Retension performs obligations or exercises rights related to the compounds under the Kadmon Agreement, Retension owns any invention developed solely by employees or agents of Retension or its affiliates in accordance with the terms of Section 9.1(c). In accordance with the terms of these provisions, we pursued, and in March 2025 were granted, a patent on a preferred crystalline polymorph form of RTN-001, which extends patent protection on RTN-001 composition of matter from 2027 to at least 2044. If a dispute arises regarding the scope of rights granted under the Historical Agreements, including inventorship and resulting ownership of the crystalline polymorph patent covering RTN-001, one or more parties to the Historical Agreements may assert that royalties are owed to them on products sold by us that are covered by this crystalline polymorph patent. While we believe that our crystalline polymorph patent for RTN-001 represents an invention owned by us, if it is determined that such invention was developed by employees or agents of one or more parties to the Historical Agreements, products covered by the crystalline polymorph patent (that are not otherwise covered by patent rights licensed to us under the Historical Agreements or subject to regulatory exclusivity) would become subject to the royalty obligations under the Historical Agreements, in which event our profit margins, financial condition, and results of operations would be materially negatively impacted. Furthermore, any dispute with our licensors could result in costly litigation, divert management attention, and damage our relationships with key licensors, and we could potentially lose our rights to develop and commercialize RTN-001 entirely, which could result in cessation of our operations.

In addition, if a dispute arises regarding inventorship and/or ownership of our preferred crystalline polymorph patent that covers RTN-001 and such dispute is not resolved in our favor, we could lose ownership rights to this patent and related patents and applications, and this patent and related patents and applications could be invalidated or rendered unenforceable. Under such circumstances we may be left without patent protection of our only product candidate. This could have a material adverse effect on our business, financial condition, results of operations and prospects.

We may seek additional in-licenses from third parties. If we are unable to acquire these rights, our business may be materially adversely affected, and if disputes arise with future licensors, we may be subject to future litigation as well as the potential loss of or limitations on our ability to develop and commercialize products and technologies covered by these license agreements.

The growth of our business may depend in part on our ability to acquire or in-license additional proprietary rights. We may be unable to acquire or in-license any relevant third-party intellectual property rights that we identify as necessary or important to our business operations at a reasonable cost or on reasonable terms, if at all, which would adversely affect our business. We may need to cease use of the technology covered by such third-party intellectual property rights and may need to seek to develop alternative approaches that do not infringe on such intellectual property rights which may entail additional costs and development delays, even if we were able to develop such alternatives, which may not be feasible. Even if we are able to obtain a license under such intellectual property rights, any such license may be non-exclusive and may allow our competitors access to the same technologies licensed to us. The licensing and acquisition of third-party intellectual property rights is a competitive practice, and companies that may be more established, or have greater resources than we do, may also be pursuing strategies to license or acquire third-party intellectual property rights that we may consider necessary or attractive for commercializing our product candidates. More established companies may have a competitive advantage over us due to their larger size and cash resources or greater clinical development and commercialization capabilities. We may not be able to successfully complete such negotiations and ultimately acquire the rights to the intellectual property surrounding the additional product candidates and technology that we may seek to acquire.

Even if we successfully enter into license agreements with third parties under which we receive rights to intellectual property that are important to our business, our continued rights to use the technology we license would be subject to the continuation of and compliance with the terms of those agreements. These intellectual property license agreements may require of us various development, regulatory or commercial diligence obligations, payment of milestones or royalties and other obligations. If we fail to comply with our obligations under these agreements, we use the licensed intellectual property in an unauthorized manner or we are subject to bankruptcy-related proceedings, the terms of the license agreements may be materially modified, such as by rendering currently exclusive licenses non-exclusive, or it may give our licensors the right to terminate their respective agreement with us, which could limit our ability to implement our current business plan and materially adversely affect our business, financial condition, results of operations and prospects.

We may also in the future enter into license agreements with third parties under which we are a sublicensee. If our sublicensor fails to comply with its obligations under its upstream license agreement with its licensor, the licensor may have the right to terminate the upstream license, which may terminate our sublicense. If this were to occur, we would no longer have rights to the applicable intellectual property unless we are able to secure our own direct license with the owner of the relevant rights, which we may not be able to do on reasonable terms, or at all, which may impact our ability to continue to develop and commercialize our product candidates incorporating the relevant intellectual property.

In some cases, we may not control the prosecution, maintenance or filing of the patents to which we hold licenses, or the enforcement of those patents against third parties. Hence, our success will depend in part on the ability of our licensors to obtain, maintain and enforce patent protection for our licensed intellectual property, in particular, those patents to which we have secured exclusive rights. Our licensors may not successfully prosecute the patent applications to which we are licensed in a manner consistent with the best interests of our business. Even if patents are issued in respect of these patent applications, our licensors may fail to maintain these patents, may determine not to pursue litigation against other companies that are infringing these patents or may pursue such litigation less aggressively than we would. Without protection for the intellectual property we license, other companies might be able to offer substantially identical products for sale, which could adversely affect our competitive business position and harm our business prospects. Further, we may have limited control over these activities or any other intellectual property that may be in-licensed. For example, we cannot be certain that such activities by licensors have been or will be conducted in compliance with applicable laws and regulations or will result in valid and enforceable patents and other intellectual property rights. We may have limited control over the manner in which our licensors initiate an infringement proceeding against a third-party infringer of the intellectual property rights or defend certain of the intellectual property that is licensed to us. It is possible that the licensors’ infringement proceeding or defense activities may be less vigorous than had we conducted them ourselves. In the event our licensors fail to adequately pursue and maintain patent protection for patents and applications they control and to timely cede control of such prosecution to us, our competitors might be able to enter the market, which would have a material adverse effect on our business.

Disputes may arise with respect to our current or future licensing and collaboration agreements and include disputes relating to:

•        the scope of rights granted under the license or collaboration agreement and other interpretation-related issues;

•        our financial or other obligations under the license or collaboration agreement;

•        whether and the extent to which our technology and product candidates infringe on intellectual property of the licensor that is not subject to the licensing arrangement;

•        the sublicensing of patent and other rights;

•        our diligence obligations under the license or collaboration agreements and what activities satisfy those diligence obligations;

•        the inventorship or ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our partners; and

•        the priority of invention of patented technology.

In spite of our efforts to comply with our obligations under our in-license agreements, our licensors might conclude that we have materially breached our obligations under our license agreements and might therefore terminate the relevant license agreement, thereby removing or limiting our ability to develop and commercialize products and technology covered by these license agreements. If any such in-license is terminated, or if the licensed patents fail to provide the intended exclusivity, competitors or other third parties might have the freedom to market or develop products similar to ours. In addition, absent the rights granted to us under such license agreements, we may infringe the intellectual property rights that are the subject of those agreements, we may be subject to litigation by the licensor, and, if such litigation by the licensor is successful, we may be required to pay damages to such licensor, or we may be required to cease our development and commercialization activities which are deemed infringing, and, in such event, we may ultimately need to modify our activities or products to design around such infringement, which may be time- and resource-consuming, and which may not be ultimately successful. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations and prospects.

In addition, certain of our future agreements with third parties may limit or delay our ability to consummate certain transactions, may impact the value of those transactions or may limit our ability to pursue certain activities. For example, we may in the future enter into license agreements that are not assignable or transferable or that require the licensor’s express consent in order for an assignment or transfer to take place.

Our intellectual property licensed from third parties may be subject to retained rights.

Our future licensors may retain certain rights under their agreements with us, including the right to use the underlying technology for noncommercial academic and research use, to publish general scientific findings from research related to the technology and to make customary scientific and scholarly disclosures of information relating to the technology. It is difficult to monitor whether our licensors limit their use of the technology to these uses, and we could incur substantial expenses to enforce our rights to our licensed technology in the event of misuse.

Government agencies may provide funding, facilities, personnel or other assistance in connection with the development of the intellectual property rights owned by or licensed to us. Such government agencies may have retained rights in such intellectual property. The U.S. federal government retains certain rights in inventions produced with its financial assistance under the Patent and Trademark Law Amendments Act (the “Bayh-Dole Act”), including the right to grant or require us to grant mandatory licenses or sublicenses to such intellectual property to third parties under certain specified circumstances, including if it is necessary to meet health and safety needs that we are not reasonably satisfying or if it is necessary to meet requirements for public use specified by federal regulations, or to manufacture products in the United States. Any exercise of such rights, including with respect to any such required sublicense of these licenses could result in the loss of significant rights and could harm our ability to commercialize licensed products. While we currently are not engaging with university partners, we cannot be sure that any co-developed intellectual property will be free from government rights pursuant to the Bayh-Dole Act. If, in the future, we co-own or license in technology which is critical to our business that is developed in whole or in part with federal funds subject to the Bayh-Dole Act, our ability to enforce or otherwise exploit patents covering such technology may be adversely affected.

We may be required to make contingent or deferred payments to collaborators or in connection with acquisitions and in-licenses of technology. Such payments may have an adverse impact on our business, financial condition, results of operations and prospects.

We have entered into, and may in the future enter into, collaborations, acquisitions and in-licensing arrangements that contemplate contingent or deferred payments. In the event we are deemed to have achieved certain milestones in connection with such contingent or deferred payments, we may be required to pay such amounts in full or in part. In particular, we have entered into the Redux Agreement under which Redux assigned to us all of its rights and obligations to make, have made, use, sell, offer for sale, import and export any product candidate related to RTN-001. Mr. Keller and Dr. Sweetnam, our CEO and CSO, respectively, are each a manager of Redux. Further, in consideration of the sublicense grant, we have agreed to assume the royalties to be paid by Redux to Kadmon under the Kadmon Agreement. Under the Historical Agreements, Kadmon is obligated to distribute a percentage of the royalties to Surface Logix. In the event that we pay royalties under the Redux Agreement, if any, Mr. Keller and Dr. Sweetnam will receive a portion of such royalties as security holders of Surface Logix. For additional information regarding the Redux Agreement and the Historical Agreements see “Business — Intellectual Property — Key Agreements.”

We currently license a U.S. composition of matter patent covering RTN-001 under the Historical Agreements, which patent is set to nominally expire in 2027, and we own a crystalline polymorph patent, which extends patent protection on RTN-001 composition of matter from 2027 to at least 2044. Our success depends in part on our ability to protect our intellectual property, which is difficult and costly, and we may not be able to ensure their protection.

Our commercial success will depend in large part on obtaining and maintaining patent and trade secret protection of RTN-001 and any future product candidates, their respective components, formulations, combination therapies, and methods used to manufacture them and methods of treatment, as well as successfully defending these patents against third-party challenges. Our ability to stop unauthorized third parties from making, using, selling, offering to sell or importing our product candidates is dependent upon the extent to which we have rights under valid and enforceable patents that cover these activities. If we are unable to secure and maintain patent protection for any product we develop, or if the scope of the patent protection secured is not sufficiently broad, our competitors could develop and commercialize products similar or identical to ours, and our ability to commercialize RTN-001 and any future product candidates we may develop may be adversely affected. The patenting process is expensive and time-consuming, and we may not be

able to file, prosecute and maintain or in-license, all necessary or desirable patent applications at a reasonable cost or in a timely manner. In addition, we may not pursue, obtain or maintain patent protection in all relevant markets. It is also possible that we will fail to identify patentable aspects of our research and development output before it is too late to obtain patent protection. Moreover, in some circumstances, we may not have the right to control the preparation, filing and prosecution of patent applications or to maintain the patents, covering technology that we license from or license to third parties, and are reliant for such purposes on our licensors or licensees. In addition, we cannot guarantee that patent applications or patents that we initially believe to be owned by the Company or a licensor will not be found to be encumbered by third-party ownership or other third-party rights that may not have been evident to us at the time of preparation, filing or in-licensing. For instance, such rights could arise from the intellectual contributions of Company employees who were previously employed by third parties, such as universities or other biopharmaceutical or pharmaceutical companies, including our competitors or potential competitors, or from the intellectual contributions of Company consultants, advisors or independent contractors with current or previous relationships with such third parties. Therefore, these patents and applications may not be prepared, filed, prosecuted or enforced in a manner consistent with the best interests of our business. Furthermore, licenses from such third parties may be required or desirable but may not be available on reasonable terms, or at all. In particular, our U.S. composition of matter patent covering RTN-001, which we currently license under the Historical Agreements, is set to nominally expire in 2027. We are therefore relying on our recently granted U.S. patent covering a preferred crystalline polymorph form of RTN-001, which provides patent protection through at least 2044, for market exclusivity following the expiration of our composition of matter patent. The invalidation of our crystalline polymorph patent, or the failure to obtain corresponding patents in key international markets, could materially adversely affect our ability to commercialize RTN-001, if approved, and could have a material adverse effect on our business, financial condition, and results of operations.

The strength of patents in the biopharmaceutical field involves complex legal and scientific questions and can be uncertain. The patent applications that we own or in-license may fail to result in issued patents with claims that cover our product candidates or uses thereof in the United States or in other foreign countries. Even if the patents are successfully issued, third parties may challenge the validity, enforceability or scope thereof, which may result in such patents being narrowed, invalidated or held unenforceable. For example, activities and disclosures undertaken by others in the past, including parties from which the Company obtained its IP rights directly or indirectly, may be used to invalidate our existing or future patents or prevent the patenting of our existing or future patent applications. Furthermore, even if they are unchallenged, our patents and patent applications may not adequately protect our intellectual property or prevent others from designing around its claims. If the breadth or strength of protection provided by the patent applications we hold with respect to our product candidates is threatened, this could dissuade companies from collaborating with us to develop, and threaten our ability to commercialize, our product candidates. Further, if we encounter delays in our clinical trials, the period of time during which we could market our product candidates under patent protection would be reduced. Since patent applications in the United States and most other countries are confidential for a period of time after filing, we cannot be certain that we were the first to file any patent application related to our product candidates.

We may be required to disclaim part or all of the term of certain patents or all of the term of certain patent applications. There may be prior art of which we are not aware that may affect the validity or enforceability of a patent claim, and we may be subject to a third-party submission of prior art to the United States Patent and Trademark Office (“USPTO”) in connection with pending patent applications, and any analogous procedures outside the United States. There also may be prior art of which we are aware, but which we believe does not affect the validity or enforceability of a claim, which may, nonetheless, ultimately be found to affect the validity or enforceability of a claim. No assurance can be given that if challenged, our patents would be found by a court to be valid or enforceable or that even if found valid and enforceable, a competitor’s technology or product would be found by a court to infringe our patents. We may analyze patents or patent applications of our competitors that we believe are relevant to our activities and conclude that we are free to operate in relation to our product candidates, but our competitors may ultimately obtain issued claims, including in patents we consider to be unrelated, which block our efforts or may potentially result in our product candidates or our activities infringing such claims. The possibility exists that others will develop products that compete with our products on an independent basis that do not infringe our patents or other intellectual property rights or will design around the claims of patents to which we have rights that cover our products.

The United States has enacted and implemented wide-ranging patent reform legislation. The U.S. Supreme Court has ruled on several patent cases in recent years, either narrowing the scope of patent protection available or the availability of patent protection in certain circumstances or weakening the rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination of

events has created uncertainty with respect to the value of patents that have already issued. Depending on actions by the U.S. Congress, the federal courts and the USPTO, the laws and regulations governing patents could change in unpredictable ways that would weaken our ability to obtain new patents or to enforce patents that we have licensed or that we might obtain in the future. For example, recent decisions raise questions regarding the award of patent term adjustment (“PTA”) for patents in families where related patents have issued without PTA. Thus, it cannot be said with certainty how PTA will/will not be viewed in the future and whether patent expiration dates, or even patent validity, may be impacted. Similarly, changes in patent law and regulations in other countries or jurisdictions or changes in the governmental bodies that enforce them or changes in how the relevant governmental authority enforces patent laws or regulations may weaken our ability to obtain new patents or to enforce patents that we have licensed or that we may obtain in the future. For example, the complexity and uncertainty of European patent laws have also increased in recent years. In Europe, a new unitary patent system took effect June 1, 2023, which has significantly impacted European patents, including those granted before June 1, 2023. Under the unitary patent system, European applications have the option, upon grant of a patent, of becoming a Unitary Patent which is subject to the jurisdiction of the Unitary Patent Court (“UPC”). Additionally, certain non-Unitary Patents that are European patents may also be subject to the jurisdiction of the UPC. As the UPC is a new court system, there is only a limited established body of substantive and procedural precedents, which increases the uncertainty of any litigation. Proprietors of certain European patents granted before the implementation of the UPC have the option of opting such patents out of the jurisdiction of the UPC and designating such patents as being subject to the jurisdiction of national courts. Patents that remain under the jurisdiction of the UPC will be potentially vulnerable to a single UPC-based revocation challenge that, if successful, could invalidate the patent in all countries who are signatories to the UPC. We cannot predict with certainty the long-term effects of any potential changes.

The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection and may not adequately protect our rights or permit us to gain or keep our competitive advantage. For example:

•        others may be able to make or use compounds that are similar to RTN-001 or any future product candidates but that are not covered by the claims of patents to which we have rights;

•        we or our licensors, as the case may be, may fail to meet our obligations to the U.S. government in regards to any in-licensed patents and patent applications funded by U.S. government grants, leading to the loss of patent rights and exclusivity;

•        we or our licensors, as the case may be, might not have been the first to file patent applications for these inventions and, as a result, may be unable to obtain any patent protection for such inventions;

•        others may independently develop similar or alternative technologies or duplicate any of our technologies;

•        it is possible that our pending patent applications will not result in issued patents;

•        it is possible that there are prior public disclosures that could invalidate our or our licensors’ patents, as the case may be, or parts of our patents or licensors’ patents;

•        it is possible that others may circumvent our owned or in-licensed patents without infringing them;

•        it is possible that there are unpublished applications or patent applications maintained in secrecy that may later issue with claims covering our products or technology similar to our own;

•        the laws of foreign countries may not protect ours or our licensors’, as the case may be, proprietary rights to the same extent as the laws of the United States;

•        the claims of our owned or in-licensed issued patents or patent applications, if and when issued, may not cover our product candidates;

•        our owned or in-licensed issued patents may not provide us with any competitive advantages, may be narrowed in scope or be held invalid or unenforceable as a result of legal challenges by third parties;

•        the inventors of our owned or in-licensed patents or patent applications may become involved with competitors, develop products or processes which design around our patents or become hostile to us or the patents or patent applications on which they are named as inventors;

•        it is possible that our owned or in-licensed patents or patent applications omit individual(s) that should be listed as inventor(s) or include individual(s) that should not be listed as inventor(s), which may cause these patents or patents issuing from these patent applications to be held invalid or unenforceable;

•        we have engaged in scientific collaborations in the past and will continue to do so in the future. Such collaborators may develop adjacent or competing products to ours that are outside the scope of our patents;

•        we may not develop, or may not be able to develop, additional proprietary technologies for which we can obtain patent protection;

•        it is possible that product candidates we develop may be covered by third parties’ patents or other exclusive rights; and

•        the patents of others may have an adverse effect on our business.

We cannot ensure that patent rights relating to inventions described and claimed in our pending patent applications will issue, or that patents that issue in the future will not be challenged and rendered invalid or unenforceable.

The patent application process is subject to numerous risks and uncertainties, and there can be no assurance that we or any of our potential future collaborators will be successful in protecting our product candidates by obtaining and defending patents. We have several patent applications in our portfolio; however, we cannot predict:

•        if and when patents may issue based on our patent applications;

•        the scope of protection of any patent issuing based on our patent applications;

•        whether the claims of any issued patent will provide protection against competitors;

•        whether or not third parties will find ways to invalidate or circumvent our patent rights;

•        whether we will need to initiate litigation or administrative proceedings to enforce and/or defend our patent rights which will be costly whether we win or lose; or

•        whether the patent applications will result in issued patents with claims that cover each of our product candidates or uses thereof in the United States or in other foreign countries.

We may be subject to a third-party pre-issuance submission of prior art to the USPTO or become involved in post-grant review (“PGR”) procedures, oppositions, derivations, revocation, reexaminations, inter partes review (“IPR”) or derivation proceedings, in the United States or elsewhere, challenging our patent rights or the patent rights of others. An adverse determination in any such challenge may result in loss of exclusivity or in our patent claims being narrowed, invalidated or held unenforceable, in whole or in part, which could limit our ability to stop others from using or commercializing similar or identical technology and products or limit the duration of the patent protection of our technology and products. Such challenges also may result in substantial cost and require significant time from our scientists and management, even if the eventual outcome is favorable to us. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations and prospects. Furthermore, if the breadth or strength of protection provided by our patents and patent applications is threatened, regardless of the outcome, it could dissuade companies from collaborating with us to license, develop or commercialize current or future product candidates.

We may rely on more than one patent to provide multiple layers of patent protection for our product candidates. If the latest-expiring patent is invalidated or held unenforceable, in whole or in part, the overall protection for the product candidate may be adversely affected. For example, if the latest-expiring patent is invalidated, the overall patent term for our product candidate could be adversely affected.

Our pending and future patent applications may not result in patents being issued that protect RTN-001 or any future product candidates, in whole or in part, or which effectively prevent others from commercializing competitive products.

Assuming the other requirements for patentability are met, currently, the first to file a patent application is generally entitled to the patent. Because patent applications in the United States and most other countries are confidential for a period of time after filing, and some remain so until issued, we cannot be certain that we will have

been the first to file any patent application related to RTN-001 or any future product candidate. Further, in cases where a particular compound of interest is in the public domain, third parties may be able to obtain patents on improvements or other inventions relating to such compound if they were to discover the same patentable inventions relating to such compounds after us but manage to file a patent application before we do. In addition, we may enter into non-disclosure and confidentiality agreements with parties who have access to confidential or patentable aspects of our research and development output, including any polymorphs and variants, such as our employees, collaborators, consultants, advisors and other third parties; however, any of these parties may breach the agreements and disclose such output before a patent application is filed, thereby jeopardizing our ability to obtain patent protection. Furthermore, if third parties have filed patent applications related to our product candidates or technology, a derivation proceeding in the United States can be initiated by a third party to determine who invented any of the subject matter covered by the claims of our patent applications. Furthermore, third parties may challenge our rights to patents and applications based on assertions that they invented the relevant subject matter before assignors or licensors of these rights to us, or that assignors or licensors of these rights to us derived the relevant inventions from them or other third parties. Therefore, we cannot be certain that we will have been the first to make the inventions claimed in any patents or pending patent applications, or that we will have been the first to file for patent protection of such inventions. Consequently, we may lose our material patent rights and rights to exclude others from practicing our inventions.

Given the amount of time required for the development, testing and regulatory review of new product candidates, our patents protecting such product candidates might expire before or shortly after such product candidates are commercialized. As a result, our intellectual property may not provide us with sufficient rights to exclude others from commercializing products similar or identical ours. Our competitors and other third parties may also seek approval to market their own products similar to or otherwise competitive with our products. Alternatively, our competitors or other third parties may seek to market generic or biosimilar versions of any approved products and, in so doing, claim that future patents owned by us are invalid, unenforceable or not infringed. In these circumstances, we may need to defend or assert our patents, or both, including by filing lawsuits alleging patent infringement. In any of these types of proceedings, a court or other agency with jurisdiction may find our patents invalid or unenforceable, or may find that our competitors are competing in a non-infringing manner. Thus, even if we have valid and enforceable patents, these patents still may not provide protection against competing products or processes sufficient to achieve our business objectives.

Moreover, some of our patents that we may file in the future may be co-owned with third parties. If we are unable to obtain an exclusive license to any such third-party co-owners’ interest in such patents or patent applications, such co-owners may be able to license their rights to other third parties, including our competitors, and our competitors could market competing products and technology. In addition, we may need the cooperation of any such co-owners of our patents in order to enforce such patents against third parties, and such cooperation may not be provided to us. Any of the foregoing could have a material adverse effect on our competitive position, business, financial conditions, results of operations and prospects.

We may not identify relevant third-party patents or may incorrectly interpret the relevance, scope or expiration of a third-party patent, which might adversely affect our ability to develop and market RTN-001 and any future product candidates. We may infringe the intellectual property rights of others, which may prevent or delay our drug development efforts and prevent us from commercializing, or increase the costs of commercializing, our products.

As the biopharmaceutical industry expands and more patents are issued, the risk increases that RTN-001 and any future product candidates may be subject to claims of infringement of the patent rights of third parties. There can be no assurance that our operations do not, or will not in the future, infringe, misappropriate or otherwise violate existing or future third-party patents or other intellectual property rights. Identification of third-party patent rights that may be relevant to our operations is difficult because patent searching is imperfect due to differences in terminology among patents, databases may be incomplete, there is a period of time, typically 18 months, after the original filing of a patent application during which patent applications are not publicly available, and the difficulty in assessing the meaning of patent claims. We cannot guarantee that any of our patent searches or analyses, including the identification of relevant patents, the scope of patent claims or the expiration of relevant patents, are complete or thorough, nor can we be certain that we have identified each and every third-party patent and pending application in the United States and abroad that is relevant to or necessary for the commercialization of RTN-001 and any future product candidates in any jurisdiction.

Numerous U.S. and foreign patents and pending patent applications exist in our market that are owned by third parties. Our competitors in both the United States and abroad, many of which have substantially greater resources and have made substantial investments in patent portfolios and competing technologies, may have applied for or obtained or may in the future apply for and obtain, patents that will prevent, limit or otherwise interfere with our ability to make, use and sell RTN-001 and any future product candidates. We do not always conduct independent reviews of pending patent applications and patents issued to third parties. Patent applications in the United States and elsewhere are typically published approximately 18 months after the earliest filing for which priority is claimed, with such earliest filing date being commonly referred to as the priority date. Certain U.S. applications that will not be filed outside the United States can remain confidential until patents issue. In addition, patent applications in the United States and elsewhere can be pending for many years before issuance, or unintentionally abandoned patents or applications can be revived. Furthermore, pending patent applications that have been published can, subject to certain limitations, be later amended in a manner that could cover our technologies, RTN-001 and any future product candidates, or the use of such product candidates. As such, there may be applications of others now pending or recently revived patents of which we are unaware. These patent applications may later result in issued patents, or the revival of previously abandoned patents, that may be infringed by the manufacture, use or sale of RTN-001 and any future product candidates or will prevent, limit or otherwise interfere with our ability to make, use or sell our technologies and product candidates.

The scope of a patent claim in the United States is determined by an interpretation of the law, the written disclosure in a patent and the patent’s prosecution history. Our interpretation of the relevance or the scope of a patent or a pending application may be incorrect. For example, we may incorrectly determine that RTN-001 or any future product candidates are not covered by a third-party patent or may incorrectly predict whether a third party’s pending application will issue with claims of relevant scope. Our determination of the expiration date of any patent in the United States or abroad that we consider relevant may be incorrect. Our failure to identify and correctly interpret relevant patents may negatively impact our ability to develop and market RTN-001 and any future product candidates.

Our commercial success depends significantly on our ability to operate without infringing the patents and other intellectual property rights of third parties. For example, there could be issued patents of which we are not aware that RTN-001 or any future product candidates infringe. There also could be patents that we believe we do not infringe but that we may ultimately be found to infringe. Competitors may file continuing patent applications claiming priority to already issued patents in the form of continuation, divisional or continuation-in-part applications, in order to maintain the pendency of a patent family and attempt to cover RTN-001 or any future product candidates.

Third parties may assert that we are employing their proprietary technology without authorization and may sue us for patent or other intellectual property infringement. These lawsuits are costly and could adversely affect our business, financial condition, results of operations and prospects and divert the attention of managerial and scientific personnel. If we are sued for patent infringement, we would need to demonstrate that RTN-001 and any future product candidates, potential products or methods either do not infringe the claims of the relevant patent or that the patent claims are invalid, and we may not be able to do either of these. Proving invalidity is difficult. For example, in the United States, proving invalidity requires a showing of clear and convincing evidence to overcome the presumption of validity enjoyed by issued patents. Even if we are successful in these proceedings, we may incur substantial costs and the time and attention of our management and scientific personnel could be diverted in pursuing these proceedings, which could have a material adverse effect on us. In addition, we may not have sufficient resources to bring these actions to a successful conclusion. If a court holds that any third-party patents are valid, enforceable and cover our products or their use, the holders of any of these patents may be able to block our ability to commercialize our products unless we acquire or obtain a license under the applicable patents, which we may be unable to obtain, or until the patents expire.

We cannot provide any assurances that third-party patents and other intellectual property rights do not exist which might be enforced against our current products and technology, including our research programs, RTN-001 and any future product candidates, their respective methods of use, manufacture and formulations thereof, and could result in either an injunction prohibiting our manufacture or future sales, or, with respect to our future sales, an obligation on our part to pay royalties or other forms of compensation to third parties, which could be significant. We may not be able to enter into licensing arrangements or make other arrangements at a reasonable cost or on reasonable terms, or at all. Any inability to secure licenses or alternative technology could result in delays in the introduction of our products or lead to prohibition of the manufacture or sale of products by us. Even if we are able to obtain a license, it may be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. We could be forced, including by court order, to cease commercializing the infringing technology or product. In addition, in any such proceeding or litigation, we could be found liable for monetary damages, including treble damages and

attorneys’ fees, if we are found to have willfully infringed a patent. A finding of infringement could prevent us from commercializing RTN-001 and any future product candidates or force us to cease some of our business operations, which could materially and adversely affect our business, financial condition, results of operations and prospects. Any claims by third parties that we have misappropriated their confidential information or trade secrets could have a similar material and adverse effect on our business, financial condition, results of operations and prospects. In addition, any uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to raise the funds necessary to continue our operations.

We may be involved in lawsuits to protect or enforce our patents or other intellectual property, which could be expensive, time-consuming and unsuccessful.

Competitors or other third parties may infringe our patents or other intellectual property, or those of our collaborators or licensing partners. To counter infringement or unauthorized use, we may be required to file infringement claims, which can be expensive and time consuming and divert the time and attention of our management and scientific personnel. Our pending patent applications cannot be enforced against third parties practicing the technology claimed in such applications unless and until a patent issues from such applications. Any claims we assert against perceived infringers could provoke these parties to assert counterclaims against us alleging that we infringe their patents, in addition to counterclaims asserting that our patents are invalid or unenforceable, or both. In patent litigation in the United States, defendant counterclaims alleging invalidity or unenforceability are commonplace. Grounds for a validity challenge could be an alleged failure to meet any of several statutory requirements, including lack of novelty, obviousness, non-enablement, insufficient written description or failure to claim patent-eligible subject matter. Grounds for an unenforceability assertion could be an allegation that someone connected with prosecution of the patent withheld relevant information from the USPTO or made a misleading statement during prosecution. The outcome following legal assertions of invalidity and unenforceability is unpredictable. In any patent infringement proceeding, there is a risk that a court will decide that a patent of ours is invalid or unenforceable, in whole or in part, and that we do not have the right to stop the other party from using the invention at issue. There is also a risk that, even if the validity of such patents is upheld, the court will construe the patent’s claims narrowly or decide that we do not have the right to stop the other party from using the invention at issue on the grounds that our patent claims do not cover the invention, or decide that the other party’s use of our patented technology falls under the safe harbor to patent infringement under 35 U.S.C. §271(e)(1). In addition, the U.S. Supreme Court recently has changed some legal principles that affect patent applications, granted patents and assessment of the eligibility or validity of these patents. As a consequence, issued patents may be found to contain invalid claims according to the newly revised eligibility and validity standards. Our future owned or in-licensed patents may be subject to challenge and subsequent invalidation or significant narrowing of claim scope in proceedings before the USPTO, or during litigation, under the revised criteria, which also could make it more difficult to obtain patents. An adverse outcome in a litigation or proceeding involving our patents could limit our ability to assert our patents against those parties or other competitors and may curtail or preclude our ability to exclude third parties from making and selling similar or competitive products. Any of these occurrences could adversely affect our competitive position, and our business, financial condition, results of operations and prospects.

Even if we establish infringement, the court may decide not to grant an injunction against further infringing activity and instead award only monetary damages, which may or may not be an adequate remedy. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during litigation. There could also be public announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could adversely affect the price of shares of our common stock. Moreover, we cannot assure you that we will have sufficient financial or other resources to file and pursue such infringement claims, which typically last for years before they are concluded.

We may not be able to detect infringement of our existing, future-owned or in-licensed patents, as the case may be, which may be especially difficult for manufacturing processes or formulation patents. Even if we detect infringement by a third party of our existing, future-owned or in-licensed patents, we may choose not to pursue litigation against or settlement with the third party. If we later sue such third party for patent infringement, the third party may have certain legal defenses available to it, which otherwise would not be available except for the delay between when the infringement was first detected and when the suit was brought. Such legal defenses may make it impossible for us to enforce our existing, future-owned or in-licensed patents, as the case may be, against such third party.

If another party questions the patentability of any of our claims in our existing, future-owned or in-licensed U.S. patents, the third party can request that the USPTO review the patent claims such as in an IPR, ex parte re-exam or PGR proceeding. These proceedings are expensive and may result in a loss of scope of some claims or a loss of the entire patent. In addition to potential USPTO proceedings, we may become a party to patent opposition proceedings at the European Patent Office or similar proceedings in other foreign patent offices, where either our future owned or in-licensed foreign patents are challenged.

In the future, we may be involved in similar proceedings challenging the patent rights of others, and the outcome of such proceedings is highly uncertain. An adverse determination in any such proceeding may result in our inability to manufacture or commercialize products without infringing third-party patent rights. The costs of these opposition or similar proceedings could be substantial and may result in a loss of scope of some claims or a loss of the entire patent. Even if we ultimately prevail in any such claims or proceedings, the monetary cost of such litigation and the diversion of the attention of our management and scientific personnel could outweigh any benefit we receive as a result of the claims or proceedings.

We may be subject to claims challenging the inventorship of our patents and other intellectual property.

We or our licensors may be subject to claims that former employees, consultants, collaborators or other third parties have an interest in our patent rights, any potential trade secrets, or other intellectual property as an inventor, co-inventor or owner of any potential trade secrets. For example, we may have inventorship disputes arise from conflicting obligations of consultants or others who are involved in developing our product candidates and other proprietary technologies we may develop. Litigation may be necessary to defend against these and other claims challenging inventorship or our patent rights, any potential trade secrets or other intellectual property. If we or our licensors fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights, such as exclusive ownership of, or right to use, intellectual property that is important to our product candidates and other proprietary technologies we may develop. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to our management and other employees. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations and prospects.

In light of the advent of artificial intelligence (“AI”)-assisted inventions, it is possible third parties could challenge our future patents as invalid for lack of a human inventor. The law regarding AI-assisted inventions and inventorship is evolving rapidly and allegations of improper inventorship of our AI-assisted inventions could pose a challenge to the enforceability of our future patents throughout the world.

Patent terms may be inadequate to protect our competitive position on RTN-001 and any future product candidates for an adequate amount of time. If we do not obtain patent term extension for our product candidates, our business may be materially harmed.

Patents have a limited lifespan. In the United States, if all maintenance fees are timely paid, the natural expiration of a patent is generally 20 years from its earliest U.S. non-provisional or international patent application filing date. Various extensions may be available, but the life of a patent, and the protection it affords, is of finite duration. Even if patents covering RTN-001 and any future product candidates are obtained, once the patent life has expired, we may have to compete with competitive products that would otherwise have been covered by our expired patents, including generics or biosimilars. Given the amount of time required for the development, testing and regulatory review of RTN-001 and any future product candidates, patents protecting such products or candidates might expire before or shortly after such products or candidates are commercialized. As a result, any patents we may own or license may not provide us with sufficient and continuing rights to exclude others from commercializing products similar or identical to ours.

Depending upon the timing, duration and specifics of any FDA marketing approval of RTN-001 and any future product candidates, any issued U.S. patents that we may own in the future may be eligible for limited patent term restoration, or patent term extension, under the Drug Price Competition and Patent Term Restoration Action of 1984, or the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent extension term of up to five years as compensation for patent term lost during the FDA regulatory review process. A patent term extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval, only one patent may be extended and only those claims covering the approved drug, an approved method for using it or a method for manufacturing it may be extended. Similar patent term restoration provisions to compensate for commercialization delay caused by regulatory review are also available in certain foreign jurisdictions, such as in Europe through its

Supplementary Protection Certificate system. However, we may not be granted any extensions for which we apply because of, for example, failing to exercise due diligence during the testing phase or regulatory review process, failing to apply within applicable deadlines, failing to apply prior to expiration of relevant patents, or otherwise failing to satisfy applicable requirements. In addition, to the extent we wish to pursue patent term extension based on a patent that we in-license from a third party, we would need the cooperation of that third party. Moreover, the applicable time period or the scope of patent protection afforded could be less than we request. If we are unable to obtain patent term extension, or the term of any such extension is less than we request, our competitors may obtain approval of competing products following our patent expiration, and our business, financial condition, results of operations and prospects could be materially harmed.

Obtaining and maintaining our patent protection is dependent on compliance with various procedural, document submission, fee payment and other requirements imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these requirements.

Periodic maintenance fees, renewal fees, annuity fees and various other governmental fees on patents and/or applications will be due to be paid to the USPTO and various governmental patent agencies outside of the United States in several stages over the lifetime of the patents and/or applications. We engage an annuity payment service provider to assist with monitoring and paying patent maintenance, renewal, annuity and other fees to the USPTO and non-U.S. governmental patent agencies.

The USPTO and various non-U.S. governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other similar provisions during the patent application process. In many cases an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules. However, there are situations in which non-compliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. In such an event, our competitors might be able to enter the market and this circumstance would have a material adverse effect on our business.

Changes in patent law in the United States and other jurisdictions could diminish the value of patents in general, thereby impairing our ability to protect RTN-001 and any future product candidates.

As is the case with other biopharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining, defending, maintaining and enforcing patents in the biopharmaceutical industry involves both technological and legal complexity and is therefore costly, time consuming and inherently uncertain. Changes in either the patent laws or interpretation of the patent laws in the United States could increase the uncertainties and costs surrounding the prosecution of patent applications and the enforcement or defense of issued patents, and may diminish our ability to protect our inventions, obtain, maintain, enforce and protect our intellectual property rights and, more generally, could affect the value of our intellectual property or narrow the scope of our future owned and licensed patents. Patent reform legislation in the United States and other countries, including the Leahy-Smith America Invents Act (the “AIA”), could increase those uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our future issued patents. The AIA includes a number of significant provisions related to U.S. patent law. These include provisions that affect the way patent applications are prosecuted, redefine prior art and provide more efficient and cost-effective avenues for competitors to challenge the validity of patents. These include allowing third-party submission of prior art to the USPTO during patent prosecution and additional procedures to attack the validity of a patent by USPTO administered post-grant proceedings, including PGR, IPR and derivation proceedings.

In addition, the patent positions of companies in the development and commercialization of pharmaceuticals are particularly uncertain. The U.S. Supreme Court has ruled on several patent cases in recent years, either narrowing the scope of patent protection available in certain circumstances or weakening the rights of patent owners in certain situations. Depending on future actions by the U.S. Congress, the U.S. courts, the USPTO and the relevant law-making bodies in other countries, the laws and regulations governing patents could change in unpredictable ways that would weaken our ability to obtain new patents and patents that we might obtain in the future. For example, in the case, Assoc. for Molecular Pathology v. Myriad Genetics, Inc., the U.S. Supreme Court held that claims to certain DNA molecules are not patentable. In Amgen Inc. v. Sanofi, the Federal Circuit held that claims with functional language may pose high hurdles in fulfilling the enablement requirement. Recent decisions raise questions regarding the award of patent term adjustment, or PTA, for patents where related patents have issued without PTA. Thus, it cannot be said with certainty

how PTA will or will not be viewed in future and whether patent expiration dates may be impacted. We cannot predict how future decisions by the courts, the U.S. Congress or the USPTO may impact the value of our patents. Any similar adverse change in the patent laws of other jurisdictions could also adversely affect our business, financial condition, results of operations and prospects.

Similarly, changes in patent law and regulations in other countries or jurisdictions or changes in the governmental bodies that enforce them or changes in how the relevant governmental authority enforces patent laws or regulations may weaken our ability to obtain new patents or to enforce patents that we have licensed or that we may obtain in the future. For example, the complexity and uncertainty of European patent laws have also increased in recent years. In Europe, a new unitary patent system took effect June 1, 2023, which has significantly impacted European patents, including those granted before June 1, 2023. Under the unitary patent system, European applications have the option, upon grant of a patent, of becoming a unitary patent which is subject to the jurisdiction of the Unitary Patent Court (“UPC”). Additionally, certain non-unitary patents that are European patents may also be subject to the jurisdiction of the UPC. As the UPC is a new court system, there is only a limited established body of substantive and procedural precedents, which increases the uncertainty of any litigation. Proprietors of certain European patents granted before the implementation of the UPC have the option of opting such patents out of the jurisdiction of the UPC and designating such patents as being subject to the jurisdiction of national courts. Patents that remain under the jurisdiction of the UPC will be potentially vulnerable to a single UPC-based revocation challenge that, if successful, could invalidate the patent in all countries who are signatories to the UPC. We cannot predict with certainty the long-term effects of any potential changes.

The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection and may not adequately protect our rights or permit us to gain or keep our competitive advantage.

If we are unable to protect the confidentiality of our trade secrets, our business and competitive position would be harmed.

In addition to the protection afforded by patents, we rely on trade secret protection and confidentiality agreements to protect proprietary know-how that is not patentable or that we elect not to patent, processes for which patents are difficult to enforce and any other elements of our discovery and development processes that involve proprietary know-how, information or technology that is not covered by patents. We may also rely on trade secret protection as temporary protection for concepts that may be included in a future patent filing. However, trade secret protection will not protect us from innovations that a competitor develops independently of our proprietary know how. If a competitor independently develops a technology that we protect as a trade secret and files a patent application on that technology, then we may not be able to patent that technology in the future and we may require a license from the competitor to use our own know-how. If the license is not available on commercially viable terms, then we may not be able to launch RTN-001 or any future product candidates. Additionally, trade secrets can be difficult to protect and some courts inside and outside the United States are less willing or unwilling to protect trade secrets. Although we require all of our employees to assign their inventions to us, and require all of our employees, consultants, advisors and any third parties who have access to our proprietary know-how, information or technology to enter into confidentiality agreements, we cannot be certain that our trade secrets and other confidential proprietary information will not be disclosed or that competitors will not otherwise gain access to our trade secrets. If our trade secrets are not adequately protected, our business, financial condition, results of operations and prospects could be adversely affected.

Intellectual property rights do not necessarily address all potential threats to our business.

The degree of future protection afforded by our intellectual property rights is uncertain because intellectual property rights have limitations and may not adequately protect our business or permit us to maintain our competitive advantage. For example:

•        others may be able to develop products that are similar to RTN-001 or any future product candidates but that are not covered by the claims of our patent applications and any patents that we may own or license;

•        we or our licensors or collaborators might not have been the first to make the inventions covered by the issued patents or patent application that we may own or license;

•        we or our licensors or collaborators might not have been the first to file patent applications covering certain of our inventions;

•        it is possible that the pending patent applications we own or license will not lead to issued patents;

•        issued patents that we may own or license may be held invalid or unenforceable, as a result of legal challenges by our competitors;

•        our competitors might conduct research and development activities in countries where we do not have patent rights and then use the information learned from such activities to develop competitive products for sale in our major commercial markets;

•        we may not develop additional proprietary technologies that are patentable;

•        the patents of others may have an adverse effect on our business;

•        we may fail to adequately protect and police our trade secrets; and

•        we may choose not to file a patent application in order to maintain certain trade secrets or know-how, and a third party may subsequently file a patent application covering such intellectual property.

Should any of these events occur, it could significantly harm our business, financial condition, results of operations and prospects.

We have limited foreign intellectual property rights and may not be able to protect our intellectual property rights throughout the world.

We have limited intellectual property rights outside the United States. Filing, prosecuting and defending patents on RTN-001 and any future product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can have a different scope and strength than those in the United States. Moreover, obtaining such protection in a timely manner, or at all, may be affected by factors or events beyond our control, such as a prolonged economic downturn or global financial or political crises. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and, further, may export otherwise infringing products to territories where we have patent protection but where enforcement is not as strong as that in the United States. These products may compete with our products in jurisdictions where we do not have any issued patents and our patent claims or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property protection, particularly those relating to biopharmaceutical products, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights generally. The initiation of proceedings by third parties to challenge the scope or validity of our patent rights in foreign jurisdictions could result in substantial cost and divert our efforts and attention from other aspects of our business. Proceedings to enforce our patent and other intellectual property rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Similarly, if our trade secrets are disclosed in a foreign jurisdiction, competitors worldwide could have access to our proprietary information and we may be without satisfactory recourse. Such disclosure could have a material adverse effect on our business. In addition, certain countries outside of the United States have compulsory licensing laws under which a patent owner may be compelled to grant licenses to third parties. In those countries, we may have limited remedies if patents are infringed or if we are compelled to grant a license to a third party, which could materially diminish the value of those patents. In addition, many countries limit the enforceability of patents against government authorities or government contractors. This could limit our potential revenue opportunities. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

Risks Related to Government Regulation

We are subject to various U.S. federal, state and foreign healthcare laws and regulations, which could increase compliance costs, and our failure to comply with these laws and regulations could adversely affect our business, financial conditions, results of operations and prospects.

Our business operations and current and future arrangements with investigators, healthcare professionals, consultants, third-party payors, patient organizations and customers expose us to broadly applicable foreign, federal and state fraud and abuse and other healthcare laws and regulations. These laws may constrain the business or financial arrangements and relationships through which we conduct our operations, including how we research, market, sell and distribute any products for which we obtain marketing approval. Such laws include, but are not limited to:

•        the federal Anti-Kickback Statute, which prohibits, among other things, persons or entities from knowingly and willfully soliciting, offering, receiving or providing any remuneration (including any kickback, bribe or certain rebates), directly or indirectly, overtly or covertly, in cash or in kind, in return for, either the referral of an individual or the purchase, lease, or order, or arranging for or recommending the purchase, lease, or order of any good, facility, item or service, for which payment may be made, in whole or in part, under a federal healthcare program such as Medicare and Medicaid. A person or entity does not need to have actual knowledge of the federal Anti-Kickback Statute or specific intent to violate it in order to have committed a violation. This statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on the one hand and prescribers, purchasers and formulary managers on the other. Although there are several statutory exceptions and regulatory safe harbors protecting certain common activities from prosecution, they are drawn narrowly, and practices that involve remuneration intended to induce prescribing, purchasing or recommending or arranging for the prescription or purchase of any drug product may be subject to scrutiny if they do not qualify for an exception or safe harbor. This law applies to our marketing practices, educational programs, pricing policies and relationships with healthcare providers. We continue to evaluate what effect, if any, these rules will have on our business;

•        the federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalties laws, which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, to the federal government, claims for payment or approval that are false or fraudulent, knowingly making, using or causing to be made or used, a false record or statement material to a false or fraudulent claim, or from knowingly making or causing to be made a false statement to avoid, decrease or conceal an obligation to pay money to the federal government. For example, life sciences companies have faced enforcement actions under the False Claims Act in connection with their alleged off-label promotion of drugs, purportedly concealing price concessions in the pricing information submitted to the government for government price reporting purposes, and allegedly providing free product to customers with the expectation that the customers would bill federal health care programs for the product, among other activities. In addition, the government may assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute or the Federal Food, Drug, and Cosmetic Act (“FDCA”) constitutes a false or fraudulent claim for purposes of the civil False Claims Act;

•        the federal Health Insurance Portability and Accountability Act of 1996 (“HIPAA”), as amended by the Health Information Technology for Economic and Clinical Health Act of 2009 (“HITECH”) and its implementing regulations, which imposes criminal and civil liability for, among other things, knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit program, including private third-party payors, or knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false statement, in connection with the delivery of, or payment for, healthcare benefits, items or services. Similar to the federal Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation. A violation of this statute is a felony and may result in fines, imprisonment or exclusion from government sponsored programs or integrity oversight and reporting obligations to resolve allegations of non-compliance;

•        the federal Physician Payments Sunshine Act, which requires certain manufacturers of drugs, devices, biologics and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance Program (with certain exceptions) to report annually to the Centers for Medicare & Medicaid Services (“CMS”), information related to payments and other “transfers of value” made to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors), certain non-physician practitioners (physician assistants, nurse practitioners, clinical nurse specialists, certified nurse anesthetists, anesthesiology assistants and certified nurse-midwives) and teaching hospitals and other healthcare providers, as well as ownership and investment interests held by such healthcare professionals and their immediate family members. CMS has the potential to impose penalties for violations of the Physician Payments Sunshine Act, depending on the circumstances, and reported payments also have the potential to draw scrutiny to our relationships with health care practitioners and academic medical institutions, which may have implications under the Anti-Kickback Statute and other healthcare laws;

•        HIPAA, as amended by HITECH and its implementing regulations, which also imposes obligations on certain covered entity healthcare providers, health plans and healthcare clearinghouses as well as their business associates that perform certain services involving the use or disclosure of individually identifiable health information, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information. HITECH created new tiers of civil monetary penalties, made civil and criminal penalties directly applicable to business associates and gave state attorneys authority to file civil actions for damages or injunctions in federal courts to enforce HIPAA laws and seek attorneys’ fees and costs;

•        the FDCA and its implementing regulations, which among other things, strictly regulate drug product marketing and prohibit manufacturers from promotion and marketing of products prior to approval or for uses inconsistent with the FDA-required labeling;

•        the civil monetary penalties statute, which, subject to certain exceptions, prohibits, among other things, the offer or transfer of remuneration, including waivers of copayments and deductible amounts (or any part thereof), to a Medicare or state healthcare program beneficiary if the person knows or should know it is likely to influence the beneficiary’s selection of a particular provider, practitioner or supplier of services reimbursable by Medicare or a state healthcare program;

•        a wide range of federal and state consumer protection and unfair competition laws, which broadly regulate marketplace activities and activities that potentially harm consumers including those related to privacy;

•        federal laws, including the Medicaid Drug Rebate Program, that require pharmaceutical manufacturers to report certain calculated product prices to the government or provide certain discounts or rebates to government authorities or private entities, often as a condition of reimbursement under government healthcare programs and the 340B Drug Discount Pricing Program which requires pharmaceutical manufacturers offering their products through the Medicaid program to offer discounts on those drugs to certain 340B covered entities;

•        the Drug Supply Chain Security Act (“DSCSA”), which imposes obligations on entities in the commercial product supply chain, including manufacturers, to identify and track prescription drugs as they are distributed in the United States; and

•        analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws, which may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers; state laws require biotechnology companies to comply with the biotechnology industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government and may require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures and pricing information; state laws limiting interactions between pharmaceutical manufacturers and members of the healthcare industry; state laws that require biotechnology companies to report information on the pricing of certain drug products; marketing restrictions and state laws governing the privacy and security of health information in certain circumstances, many of which differ from each other in significant ways and often are not preempted by federal laws, thus complicating compliance efforts; and state and local laws that require the registration of pharmaceutical sales representatives.

Efforts to ensure that our current and future business arrangements with third parties will comply with applicable healthcare and privacy laws and regulations will involve ongoing substantial costs. There has been heightened governmental scrutiny by government enforcement agencies, including, by the U.S. Department of Health and Human Services Office of Inspector General (“OIG”) and the U.S. Department of Justice (“DOJ”) in drug manufacturers’ product and patient assistance programs and the operation of such programs, including reimbursement support services, and investigations into these programs have resulted in significant civil and criminal settlements. We cannot ensure that our compliance controls, policies and procedures will be sufficient to protect against acts of our employees, consultants, business partners or vendors that may violate the laws, regulations or evolving government guidance on patient support programs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. A government investigation, regardless of its outcome, could impact our business practices, harm our reputation, divert attention of management, increase our expenses and reduce availability of assistance to patients. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant penalties, including civil, criminal and administrative penalties, damages, fines, disgorgement, imprisonment, exclusion from participation in government-funded healthcare programs, such as Medicare and Medicaid, integrity oversight and reporting obligations, contractual damages, reputational harm, diminished profits and future earnings and the curtailment or restructuring of our operations. Defending against any such actions can be costly and time-consuming and may require significant financial and personnel resources. Therefore, even if we are successful in defending against any such actions that may be brought against us, our business may be impaired. Further, if any of the physicians or other healthcare providers or entities with whom we expect to do business are found not to be in compliance with applicable laws or regulations, they may be subject to significant criminal, civil or administrative sanctions, including exclusions from government-funded healthcare programs.

Ensuring that our business arrangements with third parties comply with applicable healthcare laws and regulations involves substantial costs. It is possible that governmental authorities will conclude that our business practices do not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. The compliance and enforcement landscape, and related risk, is informed by government enforcement precedent and settlement history, Advisory Opinions and Special Fraud Alerts. Our approach to compliance may evolve over time in light of these types of developments. Additionally, the potential safe harbors available under the federal Anti-Kickback Statute are subject to change through legislative and regulatory action, and we may decide to adjust our business practices or be subject to heightened scrutiny as a result. If our operations, including activities to be conducted by our sales team, were to be found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, damages, fines, exclusion from government-funded healthcare programs, such as Medicare and Medicaid, qui tam actions brought by individual whistleblowers in the name of the government and the curtailment or restructuring of our operations.

Recently enacted legislation, future legislation and healthcare reform measures may increase the difficulty and cost for us to obtain marketing approval for and commercialize RTN-001 and any future product candidates and may affect the prices we may set.

In both the United States and certain foreign countries, there have been a number of legislative and regulatory changes or proposed changes to the healthcare system, many of which have focused on prescription drug pricing and reducing overall healthcare costs, that could impact our ability to sell our products profitably and support future innovation. We expect prescription drug pricing and other healthcare costs to continue to be subject to intense political and social pressures on a global basis.

In the United States, federal and state legislatures, health agencies and third-party payors continue to focus on containing the cost of healthcare and addressing public concern over access and affordability of prescription drugs. The Affordable Care Act (“ACA”) made significant changes to the U.S. healthcare system, which included expanding healthcare coverage through Medicaid and implementation of the individual health insurance mandate; changing coverage and reimbursement of drug products under Medicare, Medicaid and 340B government programs; imposing an annual fee on manufacturers of branded drugs; and expanding government enforcement authority. Since its enactment, there have been judicial, executive and Congressional challenges to certain aspects of the ACA. The One Big Beautiful Bill Act (“OBBBA”) has enacted, among others, changes to eligibility requirements for premium tax credits, which has resulted in less coverage in the ACA’s health insurance marketplace (“Marketplace”). In addition, the OBBBA

has made other changes to the enrollment and eligibility requirements for Medicaid, which is expected to result in the loss of coverage for certain individuals currently enrolled in Medicaid programs. Further, CMS recently proposed two mandatory payment model pilots, the Guarding U.S. Medicare Against Rising Drug Costs (GUARD) Model, focused on Part D drugs, and Global Benchmark for Efficient Drug Pricing (GLOBE), focused on Part B drugs, which will require pharmaceutical companies to pay additional rebates on certain medicines whose U.S. net-of-discount prices exceed those in certain other countries.

We are uncertain of the impact or outcome of potential executive orders, rescission of rules and policy statements, or new legislation to be enacted, especially with regards to the healthcare regulatory and policy landscape, or the impact they may have on our business. In addition, any significant spending reductions affecting Medicare, Medicaid or other publicly funded or subsidized health programs, or any significant taxes or fees imposed as part of any broader deficit reduction effort could have an adverse impact on our anticipated product revenues. There have been several recent U.S. Congressional inquiries and proposed and enacted legislation designed to bring more transparency to drug pricing, reduce the cost of prescription drugs and reform government health care program reimbursement methodologies for prescription drugs. In September 2024, CMS issued a final rule titled “Medicaid Program; Misclassification of Drugs, Program Integrity Updates Under the Medicaid Drug Rebate Program” which may impact our reimbursement and rebate strategy. In addition, the ACA expanded the 340B drug discount program to additional facilities for outpatient drugs. These facilities may purchase drugs at the discounted price provided to Medicaid and dispense drugs to people with commercial insurance coverage. This program has greatly expanded over time with qualifying facilities establishing relationships with contract pharmacies, which has continued to exert downward pressure on price and profitability of outpatient medicines. Any changes to Medicaid required rebates could also affect our 340B pricing. Other aspects of the 340B program are subject to ongoing litigation, the resolution of which could impact the scope of the 340B program.

Moreover, the Inflation Reduction Act (“IRA”) included, among other provisions, several measures intended to lower the cost of prescription drugs and related healthcare reforms. Among other things, the IRA requires manufacturers of certain drugs to engage in price negotiations with Medicare, imposes rebates under Medicare Part B and Medicare Part D to penalize price increases that outpace inflation, and replaces the Part D coverage gap discount program with a new discounting program. If any of our approved products are subject to price negotiations, it could, among other things, lead to lower revenues prior to the expiry of intellectual property protections. The Medicare drug price negotiation program is currently subject to legal challenges and therefore, its outcome remains uncertain.

Further, executive orders were signed to implement Most Favored Nation drug pricing policies designed to align certain prescription drug prices in the United States to lower prices available in other countries. Investigations are being conducted to examine price differentials and consider policy approaches for implementation, including through administrative action, and letters have been sent to pharmaceutical companies demanding further reduced prices more in line with Most Favored Nation pricing. If such Most Favored Nation policies are implemented, changes to drug pricing are expected to affect the profitability of pharmaceutical and biotech companies in the United States as well as in other countries, as a price referencing policy to the U.S. market could make it commercially unviable to commercialize a drug product in a price constrained market. The details of the proposed policies are unclear and the final terms and impact remain uncertain, and may pose long-term risks to our business and our future commercialization plans of our product candidates. In addition, the Fair Prescription Drug Prices for Americans Act was re-introduced in May 2025 and proposes to cap the retail list price of prescription drugs and biological products in the United States at the average retail list price for such product among certain countries. Although it is uncertain if these pricing proposals will take effect, reducing drug prices remains a bipartisan effort and, if made effective, could significantly impact coverage, pricing and reimbursement for any approved product. These and other similar developments could significantly limit the degree of market acceptance of our products or any of our other product candidates that receive marketing authorization. We expect that healthcare reform measures that may be adopted in the future may result in increased manufactured financial liability and additional downward pressure on the price that we may receive for any of our product candidates, if approved. Any reduction in reimbursement from Medicare or other government health care programs may result in a similar reduction in payments from private payors.

There continues to be efforts to lower drug prices through increased competition, with policy proposals seeking to facilitate generic and biosimilar approval and marketing authorization. For example, the FDA’s Biosimilar Action Plan and current Biosimilar User Fee Amendments provide a detailed account of the agency’s strategic priorities to improve the efficiency of the biosimilar and interchangeable product development and approval process and support

robust competition. In the event there is a modification to the biologic exclusivity period, other applicable regulatory exclusivity periods or other steps taken to facilitate biosimilar approvals, we could experience competition to any products for which we receive FDA approval at an earlier time than currently anticipated.

At the state level, individual states are experiencing significant economic pressure within their respective Medicaid programs and responding to public concern over the cost of healthcare. States, including California, Florida, Nevada and Maine, among others, have responded to these pressures with a range of legislative enactments and policy proposals designed to control prescription drug prices by, for example, allowing importation of pharmaceutical products from jurisdictions outside the United States, imposing Prescription Drug Affordability Boards, some with the ability to impose price controls on state drug purchases and imposing transparency measures around prescription drug prices and marketing costs. These measures, which vary by state, could adversely impact our coverage and reimbursement of our product candidates, reduce the ultimate demand for our products, if approved, and put pressure on our product net pricing. Legally mandated price controls on payment amounts by third-party payors or other restrictions could harm our business, results of operations, financial condition and prospects. In addition, regional healthcare authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other healthcare programs. This could reduce the ultimate demand for RTN-001 and any future product candidates, if approved, or put pressure on our product pricing, which could negatively affect our business, results of operations, financial condition and prospects.

There is also a great degree of uncertainty regarding how the recent U.S. Supreme Court decisions, including Loper Bright Enterprises v. Raimondo and Corner Post, Inc. v. Board of Governors of the Federal Reserve System, will impact FDA’s enforcement and decision-making authority of regulatory agencies, including those of the FDA. Loper Bright explicitly overturned Chevron deference, which previously gave judicial deference to administrative action by agencies in the executive branch. Further, the Supreme Court’s decision in Corner Post may result in challenges to FDA decisions by new litigants long into the future, resulting in greater uncertainty about our continued operations. In February 2025, an executive order was signed asserting greater authority over all federal agencies, including those established by Congress as independent from direct presidential control. The executive order may lead to continued delays, if not cancellations, of pending and proposed regulations at federal agencies and introduces uncertainty as it subjects all significant regulatory actions by the agencies to the President’s supervision and control. We cannot predict the impact that such executive order, any future executive orders or legislation implementing executive orders may have on our business or our results of operations.

In many international markets, including the European Union (the “EU”), the government regulates prescription drug prices, patient access and/or reimbursement levels to control the biopharmaceutical budget of their government-sponsored healthcare system. The EU and some individual countries have announced or implemented measures and may in the future implement new or additional measures, to reduce biopharmaceutical costs to contain healthcare expenditures and global policy efforts to accelerate generic and biosimilar competition (including U.S. initiatives) may increase earlier-than-anticipated competitive pressure on pricing and market access. These measures vary by country and may include, among other things, non-coverage decisions, patient access restrictions, international price referencing, mandatory discounts or rebates and cross-border sales of prescription drugs. These measures may impact our reimbursement strategy and could adversely affect our ability to generate revenues or commercialize our product or product candidates in certain international markets. Legally mandated price controls on payment amounts by third-party payors or other restrictions could harm our business, results of operations, financial condition and prospects. In addition, regional healthcare authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other healthcare programs. This could reduce the ultimate demand for RTN-001 and any future product candidates, if approved, or put pressure on our product pricing, which could negatively affect our business, results of operations, financial condition and prospects.

We expect that these new laws and other healthcare reform measures that may be adopted in the future may result in additional reductions in Medicare and other healthcare funding, more rigorous coverage criteria, new payment methodologies and additional downward pressure on the price that we receive for any approved product. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors. There likely will continue to be pressure on prescription drug prices globally and legislative and regulatory proposals, including at the federal and state levels in the United States, directed at broadening the availability of health care and containing or reducing the cost of health care products and services. The implementation

of these cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability or commercialize RTN-001 and any future product candidates, if approved, impact our ability to set a price that we believe is fair for our products, the level of taxes we are required to pay, and the availability of capital.

We and our service providers may be subject to a variety of privacy and data security laws and contractual obligations, which could increase compliance costs, and our actual or perceived failure to comply with such laws and obligations could subject us to potentially significant liability, fines or penalties and otherwise harm our business.

We and our service providers maintain and will maintain a large quantity of sensitive information, such as confidential business and patient health information, including in connection with our preclinical studies and clinical trials, and are subject to laws and regulations governing the privacy and security of such information. The global data protection landscape is rapidly evolving, and we and our service providers may be affected by or subject to new, amended or existing laws and regulations in the future, including as our operations continue to expand or if we decide to operate in foreign jurisdictions. These laws and regulations may be subject to differing interpretations, which adds to the complexity of processing personal data. Guidance on implementation and compliance practices is often updated or otherwise revised. This may create uncertainty in our business, affect our ability to operate in certain jurisdictions or to collect, store, transfer, use, share and otherwise process personal information, necessitate the acceptance of more onerous obligations in our contracts, result in liability or impose additional costs on us. These laws are rapidly changing, such that tracking, analyzing and complying with these laws requires significant time and expenses and can materially impact our business, as it may require investing in additional security system technical upgrades, updating contracts, consent forms, internal policies and procedures, external privacy notices and other protocols. Any failure or perceived failure by us to comply with federal, state or foreign laws or regulation, our internal policies and procedures or our contracts governing our processing of personal information could result in negative publicity, government investigations and enforcement actions, claims by third parties and damage to our reputation, any of which could have a material adverse effect on our business, financial condition, results of operations and prospects.

As our operations and business grow, we may become subject to or affected by new or additional data protection laws and regulations and face increased scrutiny or attention from regulatory authorities. In the United States, numerous federal and state laws and regulations, including health information privacy laws, wiretap laws, data breach notification laws and consumer protection laws (e.g., Section 5 of the Federal Trade Commission Act), that govern the collection, use, storage, transfer, disclosure, protection and other processing of health-related and other personal information could apply to our operations or the operations of our collaborators and third-party providers. In addition, we may obtain health information from third parties (including research institutions from which we obtain clinical trial data) that are subject to privacy and security requirements under HIPAA. While we are not currently a covered entity under HIPAA, our future operations could subject us to HIPAA as a business associate, or even a covered entity. If that is the case, depending on the facts and circumstances, we could be subject to significant penalties if we violate HIPAA.

In addition, several U.S. states have enacted comprehensive privacy laws that impose certain obligations on covered businesses, including, without limitation, providing specific disclosures in privacy notices, affording residents with certain rights concerning their personal data, and implementing certain contractual terms with vendors. As applicable, such rights may include the right to access, correct or delete certain personal data, and to opt-out of certain data processing activities, such as targeted advertising, profiling and automated decision-making. Failure to comply with these laws, where applicable, can result in significant statutory fines. For example, the California Consumer Privacy Act, as amended by the California Privacy Rights Act of 2020 (collectively, the “CCPA”), applies to personal data of consumers, business representatives, employees and consultants who are California residents, and requires businesses to provide specific disclosures in privacy notices and honor requests of such individuals to exercise certain privacy rights. The CCPA and other comprehensive U.S. state privacy laws provide exceptions for some data processed in the context of clinical trials, but these developments may further complicate compliance efforts and increase legal risk and compliance costs for us and the third parties with whom we work. The existence of comprehensive privacy laws in different states in the country make our compliance obligations more complex and costly and may increase the likelihood that we may be subject to enforcement actions or otherwise incur liability for noncompliance. In addition, certain state laws govern the privacy and security of health-related and other personal information in certain circumstances, some of which may be more stringent, different in scope, or offer greater or different individual rights than HIPAA, many of which may differ from each other, thus, complicating compliance efforts. These laws are evolving rapidly and may differ from each other in significant ways, including that some may provide for private rights of action, and may not have the same effect, thus complicating compliance efforts. Such laws

and regulations will be subject to interpretation by various courts and other governmental authorities, thus creating potentially complex compliance issues for us and our future customers and strategic partners. Failure to comply with these laws, where applicable, can result in the imposition of significant civil and/or criminal penalties and private litigation.

Further, on April 8, 2025, the DOJ implemented the Data Security Program Rule (“DSP”) under Executive Order 14117 and the International Emergency Economic Powers Act. The DSP imposes restrictions and, in some cases, prohibitions on certain data-related transactions involving U.S. persons, particularly those that may result in access to U.S. government-related data or bulk sensitive personal data of U.S. persons by foreign adversaries or entities under their control. The final rule imposes certain diligence, security, and audit record-keeping obligations, among other requirements. In the event that our data transactions fall within scope of the DSP, we may be required to stop or restrict certain data transfers, alter the geographic scope of our operations, cease doing business with certain third parties or using certain tools or vendors or change how data flows throughout our business. Failure to comply with the DSP could result in civil or criminal penalties and restrictions on our ability to engage in certain business activities. Additionally, the scope and interpretation of the rule may evolve, and future guidance or enforcement actions could impose further obligations or restrictions.

Outside the United States, an increasing number of laws and regulations, including the General Data Protection Regulation in the EU and the UK equivalent thereof (collectively, the “GDPR”) may also apply to our processing of sensitive data, including health-related and other personal data. The GDPR imposes strict obligations and restrictions on the ability to collect, analyze and transfer personal data, including health data from clinical trials and adverse event reporting. In particular, these obligations and restrictions concern, when required, the consent of the individuals to whom the personal data relates, the information provided to the individuals, the transfer of personal data out of the EU or the UK, security breach notifications, security and confidentiality of the personal data and imposition of substantial potential fines for breaches of the data protection obligations. In addition, the EU and other jurisdictions have enacted laws restricting the transfer of personal data from the EU and other jurisdictions to the United States due limitations on cross-border data flows. Although there are currently various mechanisms that may be used to transfer personal data from the EU and UK to the United States in compliance with law, these mechanisms are subject to legal challenges, and there is no assurance that we can satisfy or rely on these measures to lawfully transfer personal data to the United States.

In many jurisdictions, enforcement actions and consequences for noncompliance are rising. If our operations are found to otherwise be in violation of any data privacy and security laws, rules or regulations that apply to us, we may be subject to penalties, including civil and criminal penalties, damages, fines, litigation, and the curtailment or restructuring of our operations, which could adversely affect our ability to operate our business and our financial results. In the United States, these include enforcement actions in response to rules and regulations promulgated under the authority of federal agencies and state attorneys general and legislatures and consumer protection agencies. In the United States, most state data breach notification laws consider violations to be unfair or deceptive trade practices and give the relevant state attorneys general (“AG”) the authority to levy fines or bring enforcement actions. Such AG investigations, which are often time consuming, expensive and burdensome, may lead to a resolution agreement, whereby certain obligations are performed, and reports are made to the AG for a period of time, and/or civil penalties. Class action lawsuits against companies relating to data security and privacy issues, such as in the event of a data breach involving personal information, are also common. Additionally, the SEC and many jurisdictions have enacted or may enact laws and regulations requiring companies to disclose or otherwise provide notifications regarding data security breaches.

Compliance in the event of a violation of these requirements is costly. Although compliance programs can mitigate the risk of investigation and prosecution for violations of these laws, rules or regulations, we cannot be certain that our program will address all areas of potential exposure and the risks in this area cannot be entirely eliminated, particularly because the requirements and government interpretations of the requirements in this space are constantly evolving. Any action against us for violation of these laws, rules or regulations, even if we successfully defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business, as well as damage our business or reputation. Moreover, achieving and sustaining compliance with applicable federal, state, and international, privacy, security, and other data laws may prove costly.

Additionally, privacy advocates and industry groups have regularly proposed, and may propose in the future, self-regulatory standards that may legally or contractually apply to us. If we fail to follow these security standards, even if no personal information is compromised, we may incur significant fines or experience a significant increase in costs.

Claims that we have violated individuals’ privacy rights, failed to comply with data protection laws or breached our contractual obligations, even if we are not found liable, could be expensive and time consuming to defend, could result in adverse publicity and adversely affect our business, financial condition, results of operations and prospects. Should any of these events occur, they could have a material adverse effect on our business, financial condition, results of operations and prospects.

We, directly or through our third-party service providers, may adopt, use or incorporate artificial intelligence (“AI”) technology and capabilities as part of our business and operations. Defects in such AI technology or related security breaches, loss of data and other disruptions, as well as changes in implementation standards and enforcement practices under a rapidly evolving regulatory framework for AI technology may adversely affect our business and operations and potentially expose us to increasing liability.

We, directly or through our third-party service providers, may adopt, use or incorporate AI technology and capabilities, including into our information technology systems and software, to help us operate our business more efficiently than existing industry tools. The regulatory framework for AI technologies is rapidly evolving as many federal, state and foreign government bodies and agencies have introduced or are currently considering additional laws and regulations. For example, the EU Artificial Intelligence Act (the “EU AI Act”) establishes a framework for artificial intelligence in the EU market, and there are developing interpretations and applications of privacy laws in respect of automated decision making and other AI uses. In addition, existing laws and regulations may be interpreted in ways that would affect the use of AI in our business. As a result, implementation standards and enforcement practices are likely to remain uncertain for the foreseeable future, and we cannot yet determine the impact future laws, regulations, standards or market perception of such requirements may have on our business and may not always be able to anticipate how to respond to these laws or regulations. However, it is possible that there could be limitations on our use of AI technologies and our ability to provide, improve or commercialize our business using AI technologies, and we may need to implement additional compliance measures and changes to our operations and processes that result in increased compliance costs and risk of civil claims against us, and that could adversely affect our business, operations and financial condition.

Further, interpretation and implementation of intellectual property protection in the field of AI are rapidly evolving and there is uncertainty and ongoing litigation in different jurisdictions as to the degree and extent of protection warranted for AI and relevant system inputs and outputs. If we fail to obtain protection for intellectual property rights for any of our intellectual property that may incorporate or be developed using AI technologies, or later have our intellectual property rights invalidated or otherwise diminished, our competitors may be able to take advantage of our research and development efforts to develop competing products that could adversely affect our business, reputation and financial condition. Further, other parties may have, or in the future may obtain, patents or other proprietary rights that would prevent, limit or interfere with our ability to make, use or sell any AI technologies that we may develop, use or incorporate into our business.

Additionally, the FDA’s position on AI and its use in drug development is rapidly evolving. Changes in the FDA’s regulations and policy positions may cause significant disruption in our development or commercialization of our future product candidates. Further, the SEC has identified ‘AI-washing’ as an enforcement priority, which may heighten scrutiny of AI-related disclosures.

We are subject to U.S. and certain foreign export and import controls, sanctions, embargoes, anti-corruption laws and anti-money laundering laws and regulations. Compliance with these legal standards could impair our ability to compete in domestic and international markets. We could face criminal liability and other serious consequences for violations, which could harm our business.

We are subject to export control and import laws and regulations, including the U.S. Export Administration Regulations, U.S. Customs regulations, and various economic and trade sanctions regulations administered by the U.S. Treasury Department’s Office of Foreign Assets Controls and anti-corruption and anti-money laundering laws and regulations, including the U.S. Foreign Corrupt Practices Act of 1977, as amended, the U.S. domestic bribery statute

contained in 18 U.S.C. § 201, the U.S. Travel Act, the USA PATRIOT Act and other state and national anti-bribery and anti-money laundering laws in the countries in which we conduct activities. Anti-corruption laws are interpreted broadly and prohibit companies and their employees, consultants, agents, CROs, contractors and other collaborators and partners from authorizing, promising, offering, providing, soliciting or receiving, directly or indirectly, improper payments or anything else of value to recipients in the public or private sector. We may engage third parties for clinical trials outside of the United States, to sell our products abroad if and when we enter a commercialization phase, and/or to obtain necessary permits, licenses, patent registrations and other regulatory approvals. We have direct or indirect interactions with officials and employees of government agencies or government-affiliated hospitals, universities and other organizations. We can be held liable for the corrupt or other illegal activities of our employees, consultants, agents, CROs, contractors and other collaborators and partners, even if we do not explicitly authorize or have actual knowledge of such activities, and any training or compliance programs or other initiatives we undertake to prevent such activities may not be effective. Any violations of the laws and regulations described above may result in substantial civil and criminal fines and penalties, imprisonment, the loss of export or import privileges, debarment, tax reassessments, breach of contract and fraud litigation, reputational harm and other consequences.

Furthermore, U.S. export control laws and economic sanctions prohibit the provision of certain products and services to countries, governments and persons targeted by U.S. sanctions. U.S. sanctions that have been or may be imposed as a result of military conflicts in other countries may impact our ability to continue activities at future clinical trial sites within regions covered by such sanctions. If we fail to comply with export and import regulations and such economic sanctions, penalties could be imposed, including fines and/or denial of certain export privileges. These export and import controls and economic sanctions could also adversely affect our supply chain.

Changes in tax law may materially adversely affect our financial condition, results of operations and cash flows, or adversely impact the value of an investment in our common stock.

The rules impacting U.S. federal, state and local income taxation are constantly under review by persons involved in the legislative process and by the IRS and the U.S. Treasury Department. Changes to tax laws, which changes may have retroactive application, could adversely affect our stockholders or us. In recent years, many such changes have been made and changes are likely to continue to occur in the future. For example, beginning in 2022, the Tax Cuts and Jobs Act of 2017 eliminated the option to deduct research and development expenditures in the year incurred and instead requires taxpayers to capitalize and subsequently amortize such expenditures over five years for research activities conducted in the United States and over 15 years for research activities conducted outside the United States. The OBBBA reinstates the option to deduct domestic research and development expenditures in the year incurred, commencing with tax years beginning after December 31, 2024. Foreign research and development expenditures remain subject to the 15-year capitalization and amortization requirement. The OBBBA also includes other significant provisions, including tax cut extensions and modifications to the international tax framework. Any changes in regulations or policies related to taxation and importation, including as a result of increased tariffs, could adversely impact the global economy and our operating results. We cannot predict whether, when, in what form, or with what effective dates, tax laws, regulations and rulings may be enacted, promulgated or decided, which could result in an increase in our, or our stockholders’, tax liability or require changes in the manner in which we operate in order to minimize increases in our tax liability. Investors are urged to consult with their legal and tax advisors with respect to any changes in tax law and the potential tax consequences of investing in our common stock.

Risks Related to Our Reliance on Third Parties

We rely on, and intend to continue to rely on, third parties to conduct, supervise and monitor our ongoing and future preclinical studies and clinical trials. If these third parties do not successfully carry out their contractual duties, comply with applicable regulatory requirements or meet expected deadlines, our development programs and our ability to seek or obtain regulatory approval for or commercialize RTN-001 and any future product candidates may be delayed or subject to increased costs, each of which may have an adverse effect on our business and prospects.

We are dependent on third parties to conduct our preclinical studies and clinical trials. Specifically, we rely on, and intend to continue to rely on, medical institutions, clinical investigators, CROs and consultants to conduct preclinical studies and clinical trials, in each case in accordance with our clinical trial protocols and regulatory requirements. These CROs, investigators and other third parties play a significant role in the conduct and timing of these trials and subsequent collection and analysis of data. Though we expect to manage our relationships with our CROs, investigators and other third parties carefully, there can be no assurance that we will not encounter challenges or delays in the future or that

these delays or challenges will not have a material adverse impact on our business, financial condition and prospects. Further, while we have and will have agreements governing the activities of our third-party contractors, we have limited influence over their actual performance. Nevertheless, we are responsible for ensuring that each of our clinical trials is conducted in accordance with the applicable protocol and legal, regulatory and scientific standards and requirements, and our reliance on our CROs and other third parties does not relieve us of our regulatory responsibilities. In addition, we and our CROs are required to comply with GLP and GCP requirements, which are regulations and guidelines enforced by the FDA and comparable foreign regulatory authorities for RTN-001 and any future product candidates. Regulatory authorities enforce these GCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of our CROs or trial sites fail to comply with applicable GLP or GCP or other requirements, the clinical data generated in our clinical trials may be deemed unreliable, and the FDA or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. Failure to comply with these regulations may require us to repeat clinical trials, which would delay the regulatory approval process.

There is no guarantee that any of our CROs, investigators or other third parties will devote adequate time and resources to such trials or studies or perform as contractually required. If any of these third parties fail to meet expected deadlines, adhere to our clinical protocols or meet regulatory requirements, or otherwise perform in a substandard manner, our clinical trials may be extended, delayed or terminated. For example, we have identified material protocol and GCP non-compliance at one of the sites for the ongoing Phase 2b study of RTN-001 through a routine monitoring visit and we are in the process of closing that site and providing the required regulatory notices, including to FDA and the IRB. Based on our review of the site-specific nature of the identified noncompliance, we believe the issues identified were isolated to this site. While we do not believe that closure of this single site will have a material impact on our clinical trial, similar occurrences on any of our other sites could adversely affect the continuing conduct of this study. In addition, many of the third parties with whom we contract may also have relationships with other commercial entities, including our competitors, for whom they may also be conducting clinical trials or other development activities that could harm our competitive position. In addition, principal investigators for our clinical trials are expected to serve as scientific advisors or consultants to us from time to time and may receive cash or equity compensation in connection with such services. If these relationships and any related compensation result in perceived or actual conflicts of interest, or the FDA concludes that the financial relationship may have affected the interpretation of the trial, the integrity of the data generated at the applicable clinical trial site may be questioned and the utility of the clinical trial itself may be jeopardized, which could result in the delay or rejection by the FDA of any new drug application (“NDA”) we submit. Any such delay or rejection could prevent us from receiving regulatory approval for, or commercializing RTN-001 and any future product candidates.

If any of our relationships with these third parties terminate, we may not be able to enter into arrangements with alternative third parties on commercially reasonable terms, in a timely manner or at all. Switching or adding additional CROs, investigators and other third parties involves additional cost and requires our management’s time and focus. In addition, there is a transition period when a new CRO commences work. As a result, delays occur, which can materially impact our ability to meet our desired clinical development timelines. Though we work to manage our relationships with our CROs, investigators and other third parties carefully, there can be no guarantee that we will not encounter challenges or delays in the future or that these delays or challenges will not have a material adverse impact on our business, financial condition and prospects.

We currently rely on third parties for the manufacture of RTN-001 for clinical development and expect to continue to rely on third parties for the foreseeable future. This reliance on third parties increases the risk that we will not have sufficient quantities of RTN-001 or such quantities at an acceptable cost, which could delay, prevent or impair our development or potential commercialization efforts.

We rely on third-party CMOs to manufacture and supply drug substance and drug product for our current clinical trial for RTN-001 and we expect to continue to rely on third-party CMOs for preclinical and clinical evaluation of any future product candidates as well as for commercial manufacture if RTN-001 or any future product candidates that may receive marketing approval. Reliance on third-party manufacturers entails exposure to risks to which we would not be subject if we manufactured RTN-001 and any future product candidates ourselves, including:

•        inability to negotiate manufacturing and quality agreements with third parties under commercially reasonable terms;

•        regulatory issues experienced by third-party manufacturers;

•        reduced day-to-day control over the manufacturing process;

•        reduced control over the protection of our trade secrets and know-how from misappropriation or inadvertent disclosure;

•        termination or nonrenewal of manufacturing agreements with third parties in a manner or at a time that may be costly or damaging to us or result in delays in the development or commercialization of a product candidate;

•        disruptions to the operations of our third-party manufacturers or suppliers caused by conditions unrelated to our business or operations, including the bankruptcy of manufacturers or suppliers;

•        international or multi-national activities that are related to business activities outside of our scope, but may have an impact on a CMO’s ability to conduct business in a manner consistent with governmental or our regulatory and ethical standards; and

•        our ability to synchronize operations and standards to ensure that all aspects of manufacturing are consistent without deviations across facilities.

We do not own or operate manufacturing facilities and have no plans to develop our own clinical or commercial-scale manufacturing capabilities. The facilities used by third-party manufacturers to manufacture RTN-001 must be approved by the FDA and any comparable foreign regulatory authority pursuant to inspections that will be conducted after we submit an NDA to the FDA or any comparable submission to a foreign regulatory authority. We do not control the manufacturing process of, and are completely dependent on, third-party manufacturers for compliance with cGMP requirements for manufacture of products. If these third-party manufacturers cannot successfully manufacture material that conforms to our specifications and the strict regulatory requirements of the FDA or any comparable foreign regulatory authority, they will not be able to secure and/or maintain regulatory approval for their manufacturing facilities. In addition, we have no control over the ability of third-party manufacturers to maintain adequate quality control, quality assurance and qualified personnel. If the FDA or any comparable foreign regulatory authority does not approve these facilities for the manufacture of RTN-001 or if it withdraws any such approval in the future, we may need to find alternative manufacturing facilities, which would significantly impact our ability to develop, obtain regulatory approval for or market RTN-001, if approved. Our failure, or the failure of our third-party manufacturers, to comply with applicable regulations could result in sanctions being imposed on us, including clinical holds, fines, injunctions, civil penalties, delays, suspension or withdrawal of approvals, seizures or recalls of RTN-001 or products, operating restrictions and criminal prosecutions, any of which could significantly and adversely affect supplies of our products.

Our or a third party’s failure to execute on our manufacturing requirements on commercially reasonable terms, in a timely manner and in compliance with cGMP or other regulatory requirements could adversely affect our business in a number of ways, including:

•        an inability to initiate or continue clinical trials of RTN-001 or any future product candidates;

•        delay in submitting regulatory applications, or receiving marketing approvals, for RTN-001 or any future product candidates;

•        subjecting third-party manufacturing facilities or our potential future manufacturing facilities to additional inspections by regulatory authorities;

•        requirements to cease development or to recall batches of RTN-001 or any future product candidates; and

•        in the event of approval to market and commercialize RTN-001 or any future product candidates, an inability to meet commercial demands for RTN-001 or any future product candidates.

In addition, we do not have any long-term commitments or supply agreements with any third-party manufacturers. We may be unable to establish any long-term supply agreements with third-party manufacturers or to do so on acceptable terms, which increases the risk of failing to timely obtain sufficient quantities of RTN-001 or such quantities at an acceptable cost. Even if we are able to establish agreements with third-party manufacturers, reliance on third-party manufacturers entails additional risks, including:

•        failure of third-party manufacturers to comply with regulatory requirements and maintain quality assurance;

•        breach of the manufacturing agreement by the third party;

•        failure to manufacture our product according to our specifications;

•        failure to obtain adequate raw materials and other materials required for manufacturing;

•        failure to manufacture our product according to our schedule or at all;

•        failure to successfully scale up manufacturing capacity, if required;

•        misappropriation of our proprietary information, including any potential trade secrets and know-how; and

•        termination or nonrenewal of the agreement by the third party at a time that is costly or inconvenient for us.

Any performance failure on the part of our existing or future manufacturers could delay clinical development or marketing approval, or jeopardize our ability to commence or continue commercialization of RTN-001 or any future product candidates, and any related remedial measures may be costly or time consuming to implement. We do not currently have arrangements in place for redundant supply or a second source for all required raw materials used in the manufacture of our product candidates. We experience from time to time, and may continue to experience, supply interruptions due to a variety of factors, including:

•        general economic conditions that could adversely affect the financial viability of our vendors;

•        vendors’ election to no longer service or supply medical technology companies, including due to the burdens of applicable quality requirements and regulations or for no reason at all;

•        the limitation or ban of certain chemicals or other materials used in the manufacture of RTN-001 or any future product candidates; and

•        delays or shortages due to trade or regulatory embargoes.

If our existing or future third-party manufacturers cannot perform as agreed, we may be required to replace such manufacturers and we may be unable to replace them on a timely basis or at all. Without additional suppliers of required raw materials, we may also be unable to meet the commercial needs of a commercial launch of any future product candidates.

In addition, our current and anticipated future dependence upon others for the manufacture of RTN-001 and any future product candidates may adversely affect our future profit margins and our ability to commercialize any products that receive marketing approval on a timely and competitive basis.

If we, or our third-party manufacturers, suppliers or collaborators, fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could adversely affect our business, financial condition, results of operations and prospects.

We are subject to numerous environmental, health and safety laws and regulations, including those governing laboratory procedures and the handling, use, storage, treatment and disposal of hazardous materials and wastes. Our third-party manufacturers or suppliers use, and potential future collaborators will use, biological materials and potent chemical agents and may use hazardous materials, including chemicals and biological agents and compounds that could be dangerous to human health and safety of the environment. The operations of our third-party manufacturers and suppliers also produce hazardous waste products. Federal, state and local laws and regulations govern the use,

generation, manufacture, storage, handling and disposal of these materials and wastes. Compliance with applicable environmental laws and regulations may be expensive, and current or future environmental laws and regulations may impair our product development efforts. In addition, our third-party manufacturers and suppliers cannot eliminate the risk of accidental injury or contamination from these materials or wastes. We do not carry specific biological or hazardous waste insurance coverage. In the event of contamination or injury at our manufacturers’ or suppliers’ sites, we could be held liable for damages or be penalized with fines in an amount exceeding our resources, and our clinical trials or regulatory approvals could be suspended. Although we maintain workers’ compensation insurance for certain costs and expenses we may incur due to injuries to our employees resulting from work-related injuries, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for toxic tort claims that may be asserted against us in connection with our third-party manufacturers’ and suppliers’ storage or disposal of biologic, hazardous or radioactive materials.

In addition, our third-party manufacturers and suppliers may need to incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations, which have tended to become more stringent over time, which may increase the cost of their services to us. These current or future laws and regulations may impair our research, development or production efforts. Failure to comply with these laws and regulations also may result in substantial fines, penalties or other sanctions or liabilities for our third-party manufacturers and suppliers, which could in turn materially adversely affect our business, financial condition, results of operations and prospects. To the extent we develop our own manufacturing operations in the future, we may similarly incur substantial costs to ensure compliance with these laws, and all the foregoing risks will further apply to us, as well.

Our reliance on third parties requires us to share potential trade secrets, which increases the possibility that a competitor or other third party will discover them or that potential trade secrets will be misappropriated or disclosed.

Because we currently rely on third parties to manufacture RTN-001 and to perform quality testing, we must, at times, share our proprietary technology and confidential information, including potential trade secrets, with them. We seek to protect our proprietary technology, in part, by entering into confidentiality agreements, and, if applicable, material transfer agreements, collaborative research agreements, consulting agreements or other similar agreements with our collaborators, advisors, employees and consultants prior to beginning research or disclosing proprietary information. These agreements typically limit the rights of the third parties to use or disclose our confidential information, including any potential trade secrets. Despite the contractual provisions employed when working with third parties, the need to share trade secrets and other confidential information increases the risk that such trade secrets become known by our competitors or other third parties, are intentionally or inadvertently incorporated into the technology of others or are disclosed or used in violation of these agreements. Given that our proprietary position is based, in part, on our know-how and despite our efforts to protect any potential trade secrets, a competitor’s or other third party’s discovery of our proprietary technology and confidential information or other unauthorized use or disclosure of such technology or information would impair our competitive position and may have a material adverse effect on our business, financial condition, results of operations and prospects. While we remain vigilant in our efforts to protect the confidentiality of our intellectual property, there are inherent risks associated with third-party collaborations.

We may seek to enter into collaborations, license agreements and other similar arrangements and may not be successful in doing so, and even if we are, we may relinquish valuable rights and may not realize the benefits of such relationships, and our collaborations would be subject to other risks attendant to third-party relationships, including inability to prevent or control actions taken or not taken by such third parties which may adversely impact us.

We may seek to enter into collaborations, joint ventures, license agreements and other similar arrangements for the development, manufacture or commercialization of RTN-001 and any future product candidates, due to capital costs required to develop or commercialize the product candidate or manufacturing constraints. We may not be successful in our efforts to establish or maintain such collaborations because our research and development pipeline may be insufficient, RTN-001 or any future product candidates may be deemed to be at too early of a stage of development for collaborative effort or third parties may not view our product candidates as having the requisite potential to demonstrate safety and efficacy or significant commercial opportunity. In addition, we face significant competition in seeking appropriate strategic partners, and the negotiation process can be time-consuming and complex. Even if we are successful in our efforts to establish such collaborations, the terms that we agree upon may not be favorable to us. For example, we may need to relinquish valuable rights to our future revenue streams, research programs,

intellectual property or product candidates, or grant licenses on terms that may not be favorable to us, as part of any such arrangement, and such arrangements may restrict us from entering into additional agreements with other potential collaborators. In addition, if we enter into such collaborations, we will have limited control over the amount and timing of resources that our collaborators will dedicate to the development or commercialization of our product candidates. Our ability to generate revenue from these arrangements will depend on any future collaborators’ abilities to successfully perform the functions assigned to them in these arrangements. We cannot be certain that, following a collaboration, license or strategic transaction, we will achieve an economic benefit that justifies such transaction.

Furthermore, we may not be able to maintain such collaborations if, for example, the development or approval of a product candidate is delayed, the safety of a product candidate is questioned, or the sales of an approved product candidate are unsatisfactory.

Collaborations involving RTN-001 or any future product candidates would pose significant risks to us, including the following:

•        collaborators have significant discretion in determining the efforts and resources that they will apply to these collaborations;

•        collaborators may not perform their obligations as expected or at all;

•        we could grant exclusive rights to our collaborators that would prevent us from collaborating with others;

•        collaborators may not pursue development and commercialization of any product candidates that achieve regulatory approval or may elect not to continue or renew development or commercialization programs based on clinical trial results, changes in the collaborators’ strategic focus or available funding or external factors, such as an acquisition, that divert resources or create competing priorities;

•        collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing;

•        collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our product candidates if the collaborators believe that competitive products are more likely to be successfully developed or can be commercialized under terms that are more economically attractive than ours;

•        product candidates discovered in collaboration with us may be viewed by our collaborators as competitive with their own product candidates or drugs, which may cause collaborators to cease to devote resources to the commercialization of our product candidates;

•        a collaborator with marketing and distribution rights to any product candidate that achieves regulatory approval may not commit sufficient resources to the marketing and distribution of such products;

•        a collaborator’s sales and marketing activities or other operations may not be in compliance with applicable laws, resulting in civil or criminal proceedings;

•        disagreements with collaborators, including disagreements over proprietary rights, contract interpretation or the preferred course of development, might cause delays in or termination of the research, development or commercialization of product candidates, might lead to additional responsibilities for us with respect to product candidates, or might result in litigation or arbitration, any of which would be time-consuming and expensive;

•        collaborators may not properly enforce, maintain or defend our or their intellectual property rights or may use our or their proprietary information in such a way as to invite litigation that could jeopardize or invalidate such intellectual property or proprietary information or expose us to potential litigation;

•        collaborators may infringe, misappropriate or otherwise violate the intellectual property rights of third parties, which may expose us to litigation and potential liability;

•        collaborators may not provide us with timely and accurate information regarding development, regulatory or commercialization status or results, which could adversely impact our ability to manage our own development efforts, accurately forecast financial results or provide timely information to our stockholders regarding our out-licensed product candidates;

•        collaborators may fail to comply with regulatory requirements, which could result in delays or failures in obtaining regulatory approvals for our product candidates;

•        we may be required to invest resources and attention into such collaboration, which could distract from other business objectives;

•        disputes may arise between the collaborators and us regarding ownership of or other rights in the intellectual property generated in the course of the collaborations;

•        collaborators may become involved in disputes with third parties which could delay or prevent the development and commercialization of our product candidates;

•        collaboration agreements may not lead to development or commercialization of product candidates in the most efficient manner or at all;

•        collaborators may have different priorities or strategies for market access and distribution, which could affect the commercial success of our product candidates;

•        collaborators may experience financial difficulties or changes in their financial condition, which could impact their ability to fulfill their obligations under the collaboration agreement;

•        collaborators may inadvertently or intentionally disclose our confidential information, including trade secrets, which could harm our competitive position;

•        if a collaborator of ours were to be involved in a business combination, the continued pursuit and emphasis on our product development or commercialization program could be delayed, diminished or terminated; and

•        collaborations may be terminated, including for the convenience of the collaborator, prior to or upon the expiration of the agreed upon terms and, if terminated, we may find it more difficult to enter into future collaborations or be required to raise additional capital to pursue further development or commercialization of the applicable product candidates.

Any termination of collaborations we enter into in the future, or any delay in entering into collaborations related to RTN-001 or any future product candidates, could delay the development and commercialization of our product candidates and reduce their competitiveness if they reach the market, which could have a material adverse effect on our business, financial condition, results of operations and prospects.

Our employees and independent contractors, including principal investigators, CROs, CMOs, consultants, vendors and other third-party service providers or partners, may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, which could harm our business, financial condition, results of operations and prospects.

We are exposed to the risk that our employees and independent contractors, including principal investigators, CROs, CMOs, consultants, vendors and other third-party service providers or partners may engage in misconduct or other illegal activity. Misconduct by these parties could include intentional, reckless and/or negligent conduct or disclosure of unauthorized activities to us that violate: (i) the laws and regulations of the FDA and other similar regulatory requirements, including those laws that require the reporting of true, complete and accurate information to such authorities; (ii) manufacturing standards, including cGMP requirements; (iii) federal and state data privacy, security, fraud and abuse and other healthcare laws and regulations in the United States and abroad; (iv) laws that require the true, complete and accurate reporting of financial information or data or (v) laws that prohibit insider trading. Activities subject to these laws also involve the improper use or misrepresentation of information obtained in the course of clinical trials, the creation of fraudulent data in our preclinical studies or clinical trials or illegal misappropriation of drug product, which could result in regulatory sanctions and cause serious harm to our reputation. It is not always possible to identify and deter misconduct by employees and other third parties, and the precautions

we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. In addition, we are subject to the risk that a person or government could allege such fraud or other misconduct, even if none occurred. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business and financial results, including, without limitation, the imposition of significant civil, criminal and administrative penalties, damages, monetary fines, disgorgements, possible exclusion from participation in federal healthcare programs, including, without limitation, Medicare and Medicaid, imprisonment, contractual damages, reputational harm, diminished profits and future earnings, additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws and curtailment of our operations, any of which could adversely affect our business, financial condition, results of operations and prospects.

Risks Related to Commercialization of RTN-001 and any Future Product Candidates

Even if we receive regulatory approval for RTN-001 or any future product candidates, we will be subject to ongoing regulatory obligations and continued regulatory review, which may result in significant additional expense. Additionally, RTN-001 or any future product candidates, if approved, could be subject to labeling and other restrictions on marketing or withdrawal from the market, and we may be subject to penalties if we fail to comply with regulatory requirements or if we experience unanticipated problems with our product candidates, when and if any of them are approved.

Any regulatory approvals that we may receive for RTN-001 or any future product candidates will require the submission of reports to regulatory authorities, subject us to required surveillance to monitor the safety and efficacy of the product, may contain significant limitations related to use restrictions for specified age groups, warnings, precautions or contraindications, and may include burdensome post-approval trials or risk management requirements or commitments. For example, the FDA may require a REMS as a condition of approval of RTN-001 or any future product candidates, which could include requirements for a medication guide, physician communication plans or additional elements to ensure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. In addition, if the FDA or a comparable foreign regulatory authority approves RTN-001 or any future product candidates, the manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion, import, export and recordkeeping for our products will be subject to extensive and ongoing regulatory requirements. These requirements include submissions of safety and other post-marketing information and reports, registration, as well as continued compliance with cGMPs and cGCPs requirements for any clinical trials that we conduct post-approval. Manufacturers of approved products and their facilities are subject to continual review and periodic, typically unannounced inspections by the FDA and other regulatory authorities for compliance with cGMP regulations and standards. Failure to comply with regulatory requirements or later discovery of previously unknown problems with our products, including adverse events of unanticipated severity or frequency, or with our third-party manufacturers or manufacturing processes, may result in, among other things:

•        restrictions on the marketing or manufacturing of our products, withdrawal of the product from the market or voluntary or mandatory product recalls;

•        restrictions on product distribution or use, or requirements or commitments to conduct post-marketing studies or clinical trials;

•        restrictions on our ability to conduct clinical trials, including full or partial clinical holds on ongoing or future trials;

•        fines, restitutions, disgorgement of profits or revenue, warning letters, untitled letters, adverse publicity requirements or holds on clinical trials;

•        refusal by the FDA or other regulatory authorities to approve pending applications or supplements to approved applications submitted by us or suspension or revocation of approvals;

•        product seizure or detention, or refusal to permit the import or export of our products; and

•        injunctions and the imposition of civil or criminal penalties.

The occurrence of any event or penalty described above may inhibit our ability to commercialize RTN-001 or any future product candidates and generate revenue and could require us to expend significant time and resources in response and could generate negative publicity.

The FDA’s and other regulatory authorities’ policies may change and additional government regulations may be promulgated that could prevent, limit or delay marketing authorization of any product candidates we develop. We also cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action, or change in government administration, either in the United States or abroad. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may be subject to enforcement action and we may not achieve or sustain profitability.

The FDA and other regulatory agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses.

The FDA and other regulatory agencies strictly regulate the promotional claims that may be made about prescription products, such as RTN-001 or any future product candidates, if approved. In particular, a product may not be promoted for uses that are not approved by the FDA or such other regulatory agencies as reflected in the product’s approved labeling. If we receive marketing approval for RTN-001 or any future product candidate, physicians may nevertheless prescribe it to their patients in a manner that is inconsistent with the approved label. If we are found to have promoted such off-label uses, we may become subject to significant liability. In particular, off-label promotion has been used as the basis for the government to assert a false claims action under the FCA, which carries per claim penalties in addition to treble government damages. The U.S. federal government has levied large civil and criminal fines and extracted high dollar FCA settlements against companies for alleged improper promotion of off-label use and has enjoined several companies from engaging in off-label promotion. The government has also required companies to enter into consent decrees or imposed permanent injunctions under which specified promotional conduct is changed or curtailed. If we cannot successfully manage the promotion of RTN-001 or any future product candidates, if approved, we could become subject to significant liability, which would materially adversely affect our business and financial condition.

The commercial success of RTN-001 or any future product candidates will depend upon the degree of market acceptance of such product candidates by healthcare providers, product recipients, healthcare payors and others in the medical community. If RTN-001 or any future product candidates fail to achieve the broad degree of adoption by the medical community necessary for commercial success, our operating results and financial condition will be adversely affected, which may delay, prevent or limit our ability to generate revenue and continue our business.

RTN-001 and any future product candidates may not be commercially successful. Even if RTN-001 or any future product candidates receive regulatory approval, they may not gain market acceptance among healthcare providers, individuals within our target population, healthcare payors and others in the medical community. The commercial success of RTN-001 or any future product candidates will depend significantly on the broad adoption and use of the resulting product by these individuals and organizations for approved indications. The degree of market acceptance of our products will depend on a number of factors, including:

•        demonstration of clinical efficacy and safety, including as compared to any more-established products;

•        the indications for which our product candidates are approved;

•        the limitation of our targeted patient population and other limitations or warnings contained in any FDA-approved labeling;

•        acceptance of a new drug for the relevant indication by healthcare providers and their patients;

•        the pricing and cost-effectiveness of our products, as well as the cost of treatment with our products in relation to alternative treatments and therapies;

•        our ability to obtain and maintain sufficient third-party coverage and adequate reimbursement from government healthcare programs, including Medicare and Medicaid, private health insurers and other third-party payors;

•        the willingness of patients to pay all, or a portion of, out-of-pocket costs associated with our products in the absence of sufficient third-party coverage and adequate reimbursement;

•        any restrictions on the use of our products, and the prevalence and severity of any adverse effects;

•        potential product liability claims;

•        the timing of market introduction of our products as well as availability, safety and efficacy of competitive drugs;

•        the effectiveness of our or any potential future collaborators’ sales and marketing strategies; and

•        unfavorable publicity relating to the product.

If RTN-001 or any future product candidate is approved but does not achieve an adequate level of acceptance by physicians, hospitals, healthcare payors or patients, we may not generate sufficient revenue from that product and may not become or remain profitable. Our efforts to educate the medical community and third-party payors regarding the benefits of our products may require significant resources and may never be successful.

The successful commercialization of RTN-001 or any future product candidates, if approved, will depend in part on the extent to which governmental authorities and health insurers establish coverage, adequate reimbursement levels and favorable pricing policies. Failure to obtain or maintain coverage and adequate reimbursement for our products could limit our ability to market those products and decrease our ability to generate revenue.

The availability of coverage and the adequacy of reimbursement by governmental healthcare programs such as Medicare and Medicaid, private health insurers and other third-party payors are essential for most patients to be able to afford prescription medications such as RTN-001 and any future product candidates, if approved. Our ability to achieve coverage and acceptable levels of reimbursement for our products by third-party payors will have an effect on our ability to successfully commercialize those products. Accordingly, we will need to successfully implement a coverage and reimbursement strategy for any approved product candidate. Even if we obtain coverage for a given product by a third-party payor, the resulting reimbursement rates may not be adequate or may require co-payments or other patient out-of-pocket costs that patients find unacceptably high.

If we participate in the Medicaid Drug Rebate Program or other governmental pricing programs, in certain circumstances, our products would be subject to ceiling prices set by such programs, which could reduce the revenue we may generate from any such products. Participation in such programs would also expose us to the risk of significant civil monetary penalties, sanctions and fines should we be found to be in violation of any applicable obligations thereunder. We expect that healthcare reform measures that may be adopted in the future may result in more rigorous coverage criteria, increased manufacturer financial liability and additional downward pressure on the price that we may receive for any of our product candidates, if approved. As private payors often use Medicare coverage and reimbursement to set their own coverage and reimbursement rates, any failure to achieve coverage or adequate reimbursement from Medicare or other government health care programs may result in a similar reduction in coverage challenges or lower reimbursement from private payors.

For products administered under the supervision of a physician, obtaining coverage and adequate reimbursement may be particularly difficult because of the higher prices often associated with such drugs. Additionally, separate reimbursement for the product itself or the treatment or procedure in which the product is used may not be available, which may impact physician utilization. We cannot be sure that coverage and reimbursement in the United States, the EU or elsewhere will be available, or at an acceptable level, for any product that we may develop, and any reimbursement that may become available may be decreased or eliminated in the future.

Third-party payors increasingly are challenging prices charged for biopharmaceutical products and services, and many third-party payors may refuse to provide coverage and reimbursement for particular drugs when an equivalent generic drug or a less expensive therapy is available. It is possible that a third-party payor may consider our products as substitutable and only offer to reimburse patients for the less expensive product. Even if we are successful in demonstrating improved efficacy or improved convenience of administration with our products, pricing of existing drugs may limit the amount we will be able to charge for our products. These payors may deny or revoke the reimbursement status of a given product or establish prices for new or existing marketed products at levels that are too low to enable us to realize an appropriate return on our investment in product development. If reimbursement is not available or is available only at limited levels, we may not be able to successfully commercialize our products and may not be able to obtain a satisfactory financial return on products that we may develop.

There is significant uncertainty related to third-party payor coverage and reimbursement of newly approved products. In the United States, third-party payors, including private and governmental payors, such as the Medicare and Medicaid programs, play an important role in determining the extent to which new drugs will be covered. Some third-party payors may require pre-approval of coverage for new or innovative devices or drug therapies before they will provide coverage for such therapies. It is difficult to predict at this time what third-party payors will decide with respect to the coverage and reimbursement for RTN-001 and any future product candidates.

Obtaining and maintaining reimbursement status is time-consuming, costly and uncertain. The Medicare and Medicaid programs increasingly are used as models for how private payors and other governmental payors develop their coverage and reimbursement policies for drugs. However, no uniform policy for coverage and reimbursement for products exists among third-party payors in the United States. Therefore, coverage and reimbursement for products can differ significantly from payor to payor. As a result, the coverage determination process is often a time consuming and costly process that will require us to provide scientific and clinical support for the use of our products to each payor separately, with no assurance that coverage and adequate reimbursement will be applied consistently or obtained in the first instance. Furthermore, rules and regulations regarding reimbursement change frequently and, in some cases, at short notice, and we believe that changes in these rules and regulations are likely.

Outside the United States, international operations are generally subject to extensive governmental price controls and other market regulations, and we believe the increasing emphasis on cost-containment initiatives in Europe and other countries has and will continue to put pressure on the pricing and usage of our products candidates, if approved in these jurisdictions. In many countries, the prices of medical products are subject to varying price control mechanisms as part of national health systems. Other countries allow companies to fix their own prices for medical products but monitor and control company profits. Additional foreign price controls or other changes in pricing regulation could restrict the amount that we are able to charge for our products. Accordingly, in markets outside the United States, if any, the reimbursement for our products may be reduced compared with the United States and may be insufficient to generate commercially reasonable revenue and profits.

Moreover, increasing efforts by governmental and third-party payors in the United States and abroad to cap or reduce healthcare costs may cause such organizations to limit both coverage and the level of reimbursement for newly approved products and, as a result, they may not cover or provide adequate payment for our products. We expect to experience pricing pressures in connection with the sale of any of our products due to the trend toward managed healthcare, the increasing influence of health maintenance organizations and pharmacy benefit managers, additional legislative changes. The downward pressure on healthcare costs in general, and prescription drugs, surgical procedures and other treatments in particular, has become very intense. As a result, increasingly high barriers are being erected to the entry of new products.

Even if we receive marketing approval for RTN-001 or future product candidates in the United States, we may never receive regulatory approval to market outside of the United States.

We plan to seek regulatory approval of RTN-001 and potential future product candidates outside of the United States in the future. In order to market any product outside of the United States, however, we must establish and comply with the numerous and varying safety, efficacy and other regulatory requirements of other applicable countries. Approval procedures vary among countries and can involve additional product candidate testing and additional administrative review periods. The time required to obtain approvals in other countries might differ substantially from that required to obtain FDA approval. The marketing approval processes in other countries generally implicate all of the risks detailed above regarding FDA approval in the United States as well as other risks. In particular, in many countries outside of the United States, products must receive pricing and reimbursement approval before the product can be commercialized. Obtaining foreign regulatory approvals and compliance with foreign regulatory requirements could result in significant delays, difficulties and costs for us and could delay or prevent the introduction of any of our product candidates in certain countries. Regulatory and marketing approval in one country does not ensure regulatory and marketing approval in another, but a failure or delay in obtaining regulatory and marketing approval in one country may have a negative effect on the regulatory process in others and would impair our ability to market our current or future product candidates in such foreign markets. Any such impairment would reduce the size of our potential market, which could adversely affect our business, financial condition, results of operations and prospects.

We will face significant competition, and if our competitors develop and commercialize technologies or product candidates more rapidly than we do, or their technologies or product candidates are more effective, safer or less expensive than RTN-001 or any future product candidates we develop, our business and our ability to develop and successfully commercialize products will be adversely affected.

The biopharmaceutical industry is highly dynamic, characterized by rapid technological advancements, evolving understandings of disease mechanisms and a strong emphasis on intellectual property. In particular, there is significant competition in the market for hypertensive treatments. Our anticipated competitors have developed, are developing or may develop products, product candidates and processes competitive with RTN-001. We anticipate facing competition from a broad range of entities, including large pharmaceutical and specialty pharmaceutical companies, other biotechnology companies, and public and private research organizations. Many of these competitors have substantial financial resources, extensive expertise in research and development, and well-established manufacturing and marketing capabilities. Moreover, we may also compete with universities and other research institutions that may be active in research in our target indications and could be in direct competition with us. We also compete with these organizations to recruit management, scientists and clinical development personnel, and our inability to compete successfully could negatively affect our level of expertise and our ability to execute our business plan. We will also face competition in establishing clinical trial sites, enrolling patients for clinical trials and identifying and in-licensing intellectual property related to new product candidates, as well as entering into collaborations, joint ventures, license agreements and other similar arrangements. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies.

If we successfully obtain approval for RTN-001 or any future product candidate, we will face competition based on many different factors, including the safety and effectiveness of our products, the ease with which our products can be administered, the timing and scope of regulatory approvals for these products, the availability and cost of manufacturing, marketing and sales capabilities, price, reimbursement coverage and patent position. Competing products could present superior treatment alternatives, including by being more effective, safer, more convenient, less expensive or marketed and sold more effectively than any products we may develop. Competing products may render RTN-001 or any future product candidates we develop obsolete or noncompetitive before we recover the expense of developing and commercializing our product candidates. If we are unable to compete effectively, our opportunity to generate revenue from the sale of the products we may develop, if approved, could be adversely affected.

We currently have no marketing and sales organization, and we may need to invest significant resources to develop these capabilities. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell our products, if approved, we may not be able to generate product revenue.

We have no internal sales, marketing or distribution capabilities, nor have we commercialized a product. If RTN-001 or any future product candidate ultimately receives regulatory approval, we must build a marketing and sales organization with technical expertise and supporting distribution capabilities to commercialize each such product in major markets, which will be expensive and time consuming, or collaborate with third parties that have direct sales forces and established distribution systems, either to augment our own sales force and distribution systems or in lieu of our own sales force and distribution systems. We have no prior experience as a company with the marketing, sale or distribution of biopharmaceutical products, all of which are heavily regulated, and there are significant risks involved in the building and managing of a sales organization, including our ability to hire, retain and incentivize qualified individuals, generate sufficient sales leads, provide adequate training to sales and marketing personnel and effectively manage a geographically dispersed sales and marketing team. Any failure or delay in the development of our internal sales, marketing and distribution capabilities would adversely impact the commercialization of these products. We may not be able to enter into collaborations or hire consultants or external service providers to assist us in sales, marketing and distribution functions on acceptable financial terms, or at all. In addition, our product revenue and our profitability, if any, may be lower if we rely on third parties for these functions than if we were to market, sell and distribute any products that we develop ourselves. We likely will have little control over such third parties, and any of them may fail to devote the necessary resources and attention to sell and market our products effectively. If we are not successful in commercializing our products, either on our own or through arrangements with one or more third parties, we may not be able to generate any future product revenue and we would incur significant additional losses.

The market opportunities for RTN-001 and any future product candidates, and our forecasts of market growth, may not be accurate, and if the actual market for RTN-001 or any other product candidates is smaller than we estimate, our revenue may be adversely affected, and our business may suffer.

The precise incidence and prevalence for all the conditions we aim to address with RTN-001 or any future product candidates are unknown. Our projections of both the number of people who have these diseases, as well as the subset of people with these diseases who have the potential to benefit from treatment with our product candidates, are based on a number of internal and third-party estimates. These estimates have been derived from a variety of sources, including the scientific literature, surveys of clinics, patient foundations or market research, and may prove to be incorrect. Further, new trials may change the estimated incidence or prevalence of these indications. While we believe our assumptions and the data underlying our estimates are reasonable, we have not independently verified the accuracy of the third-party data on which we have based our assumptions and estimates, and these assumptions and estimates may not be correct and the conditions supporting our assumptions or estimates may change at any time, including as a result of factors outside our control, thereby reducing the predictive accuracy of these underlying factors. The total addressable market across all of the potential indications for RTN-001 and any future product candidates will ultimately depend upon, among other things, the diagnosis criteria included in the final label for each such product candidate which receives marketing approval for these indications, the availability of alternative treatments and the safety, convenience, cost and efficacy of such product candidates relative to such alternative treatments, acceptance by the medical community and patient access, drug pricing and reimbursement. The number of patients in the United States and other major markets and elsewhere may turn out to be lower than expected, patients may not be otherwise amenable to treatment with our product candidates or new patients may become increasingly difficult to identify or gain access to, all of which would adversely affect our business, financial condition, results of operations and prospects.

Our future growth may depend, in part, on our ability to operate in foreign markets, where we would be subject to additional regulatory burdens and other risks and uncertainties.

Our future growth may depend, in part, on our ability to develop and commercialize RTN-001 and any future product candidates in foreign markets. We are not permitted to market or promote any product candidate before we receive regulatory approval from applicable regulatory authorities in foreign markets, and we may never receive such regulatory approvals for RTN-001 or any future product candidates. To obtain separate regulatory approval in many other countries we must comply with numerous and varying regulatory requirements regarding safety and efficacy and governing, among other things, clinical trials, commercial sales, pricing and distribution of RTN-001 and any future product candidates. Approval procedures may be more onerous than those in the United States and may require that we conduct additional preclinical studies or clinical trials. If we obtain regulatory approval of product candidates and ultimately commercialize our products in foreign markets, we would be subject to additional risks and uncertainties, including:

•        different regulatory requirements for approval of drugs in foreign countries;

•        reduced protection for intellectual property rights;

•        the existence of additional third-party patent rights of potential relevance to our business;

•        unexpected changes in tariffs, trade barriers and regulatory requirements;

•        economic weakness, including inflation, or political instability in particular foreign economies and markets;

•        compliance with export control and import laws and regulations;

•        compliance with tax, employment, immigration and labor laws for employees and consultants living or traveling abroad;

•        foreign reimbursement, pricing and insurance regimes;

•        workforce uncertainty in countries where labor unrest is common;

•        differing regulatory requirements with respect to manufacturing of products;

•        production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad;

•        business interruptions resulting from natural or man-made disasters, including, but not limited to, earthquakes, hurricanes, typhoons, floods, water shortages, fires, blizzards and other extreme weather conditions, power outages and telecommunications or infrastructure failure, cybersecurity incidents or physical security breaches, geopolitical conflicts, including war and terrorism, and public health concerns, including pandemics and epidemics; and

•        disruptions resulting from the impact of public health concerns, including pandemics or epidemics.

Our business entails a significant risk of product liability and an inability to obtain sufficient insurance coverage for those or other claims could adversely affect our business, financial condition, results of operations and prospects.

We face an inherent risk of product liability as a result of the clinical trials of RTN-001 and any future product candidates and will face an even greater risk if we commercialize our product candidates, especially if our products are prescribed for off-label uses, even if we do not promote such uses. For example, we may be sued if our product candidates allegedly cause injury or are found to be otherwise unsuitable during product testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product candidate, negligence, strict liability and a breach of warranties. Claims may be brought against us by clinical trial participants, patients or others using, administering or selling products that may be approved in the future. Claims could also be asserted under state consumer protection acts.

If we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit, delay or cease the commercialization of our products. Even a successful defense would require significant financial and management resources. Regardless of the merits or eventual outcome, liability claims may result in:

•        decreased demand for any of our products that may receive regulatory approval;

•        injury to our reputation and significant negative media attention;

•        withdrawal of clinical trial participants;

•        costs to defend the related litigation;

•        a diversion of our management’s time and our resources;

•        substantial monetary awards to trial participants or product recipients;

•        product recalls, withdrawals or labeling, marketing or promotional restrictions;

•        significant negative financial impact;

•        the inability to commercialize RTN-001 or any future product candidates; and

•        a decline in our stock price.

While we currently maintain product liability insurance coverage, we may need to increase our insurance coverage as we expand our clinical trials or if we commence commercialization of RTN-001 or any future product candidates. Insurance coverage is increasingly expensive. Our inability to obtain and retain sufficient product liability insurance at an acceptable cost to protect against potential product liability claims could prevent or inhibit the commercialization of RTN-001 or any future product candidates. Although we will maintain such insurance, any claim that may be brought against us could result in a court judgment or settlement in an amount that is not covered, in whole or in part, by our insurance or that is in excess of the limits of our insurance coverage. Our insurance policies will also have various

exclusions, and we may be subject to a product liability claim for which we have no coverage. We may have to pay any amounts awarded by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay such amounts.

Risks Related to Our Common Stock and this Offering

There has been no public market for our common stock. An active and liquid trading market for our common stock may not develop, or we may in the future fail to satisfy the continued listing requirements of the Nasdaq and our stock may be delisted, and you may not be able to resell your common stock at or above the initial public offering price or at all.

Prior to this offering, there has been no public market for our common stock. Although we have applied to list our common stock on the Nasdaq, an active trading market for our common stock may never develop or may not be sustained following this offering. We and the underwriters will determine the initial public offering price of our common stock through negotiation. This price will not necessarily reflect the price at which investors in the market will be willing to buy and sell our shares following this offering. In addition, an active trading market may not develop following the closing of this offering or, if it is developed, may not be sustained. The lack of an active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you consider reasonable. An inactive market may also impair our ability to raise capital by selling shares and may impair our ability to acquire other businesses or technologies using our shares as consideration, which, in turn, could materially adversely affect our business.

If, after listing, we fail to satisfy the continued listing requirements of Nasdaq, such as the corporate governance requirements or the minimum closing bid price requirement, Nasdaq may take steps to delist our common stock. Such a delisting would likely have a negative effect on the price of our common stock and would impair your ability to sell or purchase our common stock when you wish to do so. In the event of a delisting, we can provide no assurance that any action taken by us to restore compliance with listing requirements would allow our common stock to become listed again, stabilize the market price or improve the liquidity of our common stock, prevent our common stock from dropping below the Nasdaq minimum bid price requirement or prevent future non-compliance with the listing requirements of Nasdaq.

The trading price of the shares of our common stock could be highly volatile, and purchasers of our common stock could incur substantial losses.

Our stock price is likely to be volatile. The stock market in general and the market for stock of biopharmaceutical companies in particular have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. As a result of this volatility, investors may not be able to sell their common stock at or above the initial public offering price. The market price for our common stock may be influenced by those factors discussed in this “Risk Factors” section and many others, including:

•        results of our preclinical studies and clinical trials, and the results of trials of our competitors or those of other companies in our market sector;

•        the characteristics, safety, and efficacy of RTN-001 and any future product candidates and the potential differentiators of RTN-001 and any such future product candidates compared to alternative therapies;

•        our ability to enroll patients in our future clinical trials;

•        our ability to obtain and maintain regulatory approval of RTN-001 or any future product candidates or additional indications thereof, or limitations to specific label indications or patient populations for its use, or changes or delays in the regulatory review process;

•        regulatory or legal developments in the United States and foreign countries;

•        changes in the structure of healthcare payment systems;

•        the success or failure of our efforts to identify, develop, acquire or license additional product candidates;

•        innovations, clinical trial results, product approvals and other developments by our competitors;

•        announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures or capital commitments;

•        the degree and rate of physician and market adoption of any of our current and future product candidates;

•        manufacturing, supply or distribution delays or shortages, including our inability to obtain adequate product supply, at acceptable prices or at all;

•        any changes to our relationship with any manufacturers, suppliers, collaborators or other strategic partners;

•        achievement of expected product sales and profitability;

•        variations in our financial results or those of companies that are perceived to be similar to us, including variations from expectations of securities analysts or investors;

•        market conditions in the biopharmaceutical sector and issuance of securities analysts’ reports or recommendations;

•        trading volume of our common stock;

•        an inability to obtain additional funding or obtaining funding on unattractive terms;

•        sales of our stock by us, our insiders or our stockholders, as well as the anticipation of lock-up releases;

•        general economic, industry and market conditions, other events or factors, many of which are beyond our control;

•        actual or anticipated fluctuations in our financial condition and results of operations;

•        publication of news releases by other companies in our industry, and especially competitors, including about adverse developments related to safety, effectiveness, accuracy and usability of their products, reputational concerns, reimbursement coverage, regulatory compliance, and product recalls;

•        geopolitical events or macroeconomic conditions;

•        additions or departures of senior management or key personnel;

•        intellectual property, product liability or other litigation against us or our inability to enforce our intellectual property;

•        changes in our capital structure, such as future issuances of securities and the incurrence of additional debt; and

•        changes in accounting standards, policies, guidelines, interpretations or principles.

In addition, in the past, stockholders have initiated class action lawsuits against biopharmaceutical companies following periods of volatility in the market prices of these companies’ stock. Such litigation, if instituted against us, could cause us to incur substantial costs, divert our management’s attention and resources and damage our reputation, which could have a material adverse effect on our business, financial condition, results of operations and prospects.

We will have broad discretion in the use of the net proceeds from this offering, and may use them ineffectively, in ways that you and other stockholders may not approve, or in ways that do not increase the value of your investment.

Our management will have broad discretion in the application of the net proceeds from this offering, including for any of the purposes described in “Use of Proceeds.” Because of the number and variability of factors that will determine our use of the net proceeds from this offering, their ultimate use may vary substantially from their currently intended use. Our management might not apply our net proceeds in ways that ultimately increase the value of your investment, in ways that are otherwise ineffective or in ways with which you disagree, and the failure by our management to apply these funds effectively could harm our business. Pending their use, we may invest the net proceeds from this offering in short- and intermediate-term, interest-bearing obligations, investment-grade instruments, certificates of deposit or

direct or guaranteed obligations of the U.S. government. These investments may not yield a favorable return to our stockholders. If we do not invest or apply the net proceeds from this offering in ways that enhance stockholder value, we may fail to achieve expected results, which could cause our stock price to decline.

You will suffer immediate and substantial dilution in the net tangible book value of the common stock you purchase in this offering.

The initial public offering price of our common stock is substantially higher than the pro forma as adjusted net tangible book value per share of our outstanding common stock immediately after the closing of this offering. Purchasers of common stock in this offering will experience immediate dilution of approximately $6.03 per share, assuming an initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover of this prospectus. In the past, we issued options to acquire common stock at prices significantly below the initial public offering price. To the extent these outstanding options are ultimately exercised, investors purchasing common stock in this offering will sustain further dilution. For a further description of the dilution that you will experience immediately after this offering, see “Dilution.”

After this offering, our executive officers, directors and principal stockholders, if they choose to act together, will continue to have the ability to significantly influence all matters submitted to stockholders for approval and may prevent new investors from influencing significant corporate decisions.

Following the closing of this offering, our executive officers, directors and greater than 5% stockholders, in the aggregate, will own approximately 16.8% of our outstanding common stock (assuming no exercise of the underwriters’ option to purchase additional shares in this offering and no exercise of outstanding options or warrants, and without giving effect to any potential purchases by such persons in this offering). As a result, such persons, acting together, will have the ability to significantly influence all matters submitted to our stockholders for approval, including the election and removal of directors and approval of any significant transactions, which may prevent new investors from influencing some or all of the foregoing. This concentration of ownership may have the effect of delaying, deferring or preventing a change in control, impeding a merger, consolidation, takeover or other business combination involving us, or discouraging a potential acquiror from making a tender offer or otherwise attempting to obtain control of our business, even if such a transaction would benefit other stockholders.

We have entered into transactions with entities controlled by some of our officers and directors, which could pose a conflict of interest.

We are a party to the Redux Agreement through Retension IP, our wholly-owned subsidiary and formerly a subsidiary of Redux, pursuant to which we were granted an exclusive (even as to Redux), worldwide, royalty-bearing rights and license to Redux’s intellectual property rights under the Kadmon Agreement to develop, manufacture, and commercialize RTN-001. Mr. Keller and Dr. Sweetnam, our CEO and CSO, respectively, are each a manager of Redux. Further, in consideration of the sublicense grant, we have agreed to assume the royalties to be paid by Redux to Kadmon under the Kadmon Agreement. Under the Historical Agreements, Kadmon is obligated to distribute a percentage of the royalties to Surface Logix. In the event that we pay royalties under the Redux Agreement, if any, Mr. Keller and Dr. Sweetnam will receive a portion of such royalties as security holders of Surface Logix. Although we believe that these transactions were advantageous to us and were on terms no less favorable to us than could have been obtained from unaffiliated third parties, transactions with related parties can potentially pose a conflict of interest. See “Business — Intellectual Property — Key Agreements” and “Certain Relationships and Related Party Transactions — Sublicense Agreements.”

We do not currently intend to pay dividends on our common stock, and, consequently, your ability to achieve a return on your investment will depend on appreciation, if any, in the price of our common stock.

We have never declared or paid any cash dividend on our common stock. We currently anticipate that we will retain future earnings for the development, operation and expansion of our business and do not anticipate declaring or paying any cash dividends for the foreseeable future. In addition, any future debt agreements may preclude us from paying dividends. For the foreseeable future, any return to stockholders will therefore be limited to the appreciation of their stock. There is no guarantee that shares of our common stock will appreciate in value or even maintain the price at which stockholders have purchased their shares.

Sales of a substantial number of shares of our common stock by our existing stockholders in the public market could cause our stock price to fall.

Sales of a substantial number of shares of our common stock in the public market or the perception that these sales might occur could significantly reduce the market price of our common stock and impair our ability to raise adequate capital through the sale of additional equity or equity-linked securities.

Based on shares of common stock outstanding as of June 30, 2026 (reflecting the Reverse Stock Split), upon the closing of this offering, we will have a total of 7,881,599 shares of common stock outstanding, assuming no exercise of the underwriters’ option to purchase additional shares and no exercise of outstanding options or warrants. Of these shares, 3,300,000 shares of common stock sold in this offering by us, plus any shares sold upon exercise of the underwriters’ option to purchase additional shares, will be freely tradable, without restriction, in the public market immediately following this offering, unless they are purchased by one of our affiliates.

Our directors and executive officers and holders of substantially all of our outstanding securities have entered into lock-up agreements with the underwriters pursuant to which they may not, with limited exceptions, for a period of 180 days from the date of this prospectus, offer, sell or otherwise transfer or dispose of any of our securities, without the prior written consent of Leerink Partners LLC and Guggenheim Securities, LLC. The underwriters may permit our officers, directors and other securityholders who are subject to the lock-up agreements to sell shares prior to the expiration of the lock-up agreements at any time in their sole discretion. See “Underwriting.” Sales of these shares, or perceptions that they will be sold, could cause the trading price of our common stock to decline. After the lock-up agreements expire, up to 4,582,047 additional shares of common stock will be eligible for sale in the public market, of which 1,284,359 shares (including the exercise of outstanding options and warrants) will be held by directors, executive officers and other affiliates and will be subject to volume limitations under Rule 144 under the Securities Act of 1933, as amended (the “Securities Act”), in each case based on shares of common stock outstanding as of September 30, 2026 and without giving effect to any potential purchases by such persons in this offering.

Further, as of June 30, 2026, 1,230,385 shares of common stock were subject to outstanding options under our employee benefit plans. Such shares will, in the future, become eligible for sale in the public market to the extent permitted by the provisions of various vesting schedules, the lock-up agreements and Rule 144 and Rule 701 under the Securities Act. If these additional shares of common stock are sold, or if it is perceived that they will be sold, in the public market, the trading price of our common stock could decline.

In addition, in the future, we may issue additional shares of common stock, or other equity or debt securities convertible into common stock, in connection with a financing, acquisition, employee arrangement, or otherwise. Any such issuance could result in substantial dilution to our existing stockholders and could cause the price of our common stock to decline.

We are an emerging growth company and a smaller reporting company, and the reduced disclosure requirements applicable to emerging growth companies and smaller reporting companies may make our common stock less attractive to investors.

We are an emerging growth company, as defined in the JOBS Act, and may remain an emerging growth company until the last day of the fiscal year following the fifth anniversary of the closing of this offering. However, if certain events occur prior to the end of such five-year period, including if we become a “large accelerated filer,” as defined under the Exchange Act, our annual gross revenue exceeds $1.235 billion or we issue more than $1.0 billion of non-convertible debt in any three-year period, we will cease to be an emerging growth company prior to the end of such five-year period. For so long as we remain an emerging growth company, we are permitted and intend to rely on exemptions from certain disclosure requirements that are applicable to other public companies that are not emerging growth companies.

These exemptions include:

•        being permitted to provide only two years of audited financial statements, in addition to any required unaudited interim financial statements, with correspondingly reduced “Management’s Discussion and Analysis of Financial Condition and Results of Operations” disclosure in connection with registered securities offerings;

•        not being required to comply with the auditor attestation requirements in the assessment of our internal control over financial reporting pursuant to the Sarbanes-Oxley Act;

•        not being required to comply with any requirement that may be adopted by the Public Company Accounting Oversight Board regarding mandatory audit firm rotation or a supplement to the auditor’s report providing additional information about the audit and the financial statements, unless the SEC determines the new rules are necessary for protecting the public;

•        reduced disclosure obligations regarding executive compensation; and

•        exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved.

We have taken advantage of reduced reporting burdens in this prospectus. In particular, in this prospectus, we have provided only two years of audited financial statements and have not included all of the executive compensation-related information that would be required if we were not an emerging growth company. We cannot predict whether investors will find our common stock less attractive if we rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be reduced or more volatile. In addition, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This allows an emerging growth company to delay the adoption of these accounting standards until they would otherwise apply to private companies. We have irrevocably elected to avail ourselves of this exemption and, therefore, we may not be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies. We intend to rely on other exemptions provided by the JOBS Act, including without limitation, not being required to comply with the auditor attestation requirements of Section 404(b) of the Sarbanes-Oxley Act.

We are also a smaller reporting company as defined in the Exchange Act. We may continue to be a smaller reporting company even after we are no longer an emerging growth company. We may take advantage of certain of the scaled disclosures available to smaller reporting companies and will be able to take advantage of these scaled disclosures for so long as our voting and non-voting common stock held by non-affiliates is less than $250.0 million measured on the last business day of our second fiscal quarter, or our annual revenue is less than $100.0 million during the most recently completed fiscal year and our voting and non-voting common stock held by non-affiliates is less than $700.0 million measured on the last business day of our second fiscal quarter.

Our failure to meet Nasdaq’s continued listing requirements could result in a delisting of our common stock.

If we are approved for listing, and after listing we fail to satisfy the continued listing requirements of Nasdaq, such as the minimum closing bid price requirement, Nasdaq may take steps to delist our common stock. Such a delisting would have a negative effect on the price of our common stock and would impair your ability to sell or purchase our common stock when you wish to do so. In the event of a delisting, we can provide no assurance that any action taken by us to restore compliance with listing requirements would allow our common stock to become listed again, stabilize the market price or improve the liquidity of our common stock, prevent our common stock from dropping below the Nasdaq minimum bid price requirement or prevent future non-compliance with the listing requirements of Nasdaq.

Provisions in our Certificate of Incorporation and Bylaws and certain provisions under Delaware law could discourage a takeover that stockholders may consider favorable and may lead to entrenchment of management.

Our Certificate of Incorporation and Bylaws that will be in effect immediately prior to the closing of this offering will contain provisions that could significantly reduce the value of our shares to a potential acquiror or delay or prevent changes in control or changes in our management without the consent of our board of directors. Such provisions will include the following:

•        no cumulative voting in the election of directors, which limits the ability of minority stockholders to elect director candidates;

•        the exclusive right of our board of directors, unless the board of directors grants such right to the stockholders, to elect a director to fill a vacancy created by the expansion of the board of directors or the resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on our board of directors;

•        the required approval of at least 66 2/3% of the shares entitled to vote to remove a director with or without cause;

•        the ability of our board of directors to authorize the issuance of shares of preferred stock and to determine the price and other terms of those shares, including preferences and voting rights, without stockholder approval, which could be used to significantly dilute the ownership of a hostile acquiror;

•        the ability of our board of directors to alter our Bylaws without obtaining stockholder approval;

•        the required approval of at least 66 2/3% of the shares entitled to vote to adopt, amend or repeal our Bylaws or repeal the provisions of our Certificate of Incorporation regarding the election and removal of directors;

•        a prohibition on stockholder action by written consent, which forces stockholder action to be taken at an annual or special meeting of our stockholders;

•        an exclusive forum provision providing that the Court of Chancery of the State of Delaware will be the exclusive forum for certain actions and proceedings;

•        the requirement that a special meeting of stockholders may be called only by our board of directors, the chair of the board of directors or our CEO, which may delay the ability of our stockholders to force consideration of a proposal or to take action, including the removal of directors; and

•        advance notice procedures that stockholders must comply with in order to nominate candidates to our board of directors or to propose matters to be acted upon at a stockholders’ meeting, which may discourage or deter a potential acquiror from conducting a solicitation of proxies to elect the acquiror’s own slate of directors or otherwise attempting to obtain control of us.

We are also subject to the anti-takeover provisions contained in Section 203 of the Delaware General Corporation Law. Under Section 203, a corporation may not, in general, engage in a business combination with any holder of 15% or more of its capital stock unless the holder has held the stock for three years or, among other exceptions, the board of directors has approved the transaction.

Our Certificate of Incorporation to be effective immediately prior to the closing of this offering will provide that the Court of Chancery of the State of Delaware will be the exclusive forum for substantially all disputes between us and our stockholders and that the federal district courts shall be the exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers, employees or consultants or the underwriters or any offering giving rise to such claim.

Our Certificate of Incorporation that will be in effect immediately prior to the closing of this offering will provide, that the Court of Chancery of the State of Delaware is the exclusive forum for any derivative action or proceeding brought on our behalf, any action asserting a breach of fiduciary duty, any action asserting a claim against us arising pursuant to the Delaware General Corporation Law, our Certificate of Incorporation or our Bylaws, or any action asserting a claim against us that is governed by the internal affairs doctrine; provided, that, this provision would not apply to suits brought to enforce a duty or liability created by the Exchange Act. Furthermore, our Certificate of Incorporation will also provide that unless we consent in writing to the selection of an alternative forum, the federal district courts of the United States shall be the exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act. These choice of forum provisions may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers or other employees or consultants, which may discourage such lawsuits against us and our directors, officers and other employees or consultants and result in increased costs for investors to bring a claim. By agreeing to this provision, however, stockholders will not be deemed to have waived our compliance with the federal securities laws and the rules and regulations thereunder. Furthermore, the enforceability of similar choice of forum provisions in other companies’ certificates of incorporation has been challenged in legal proceedings, and it is possible that a court could find these types of provisions to be inapplicable or unenforceable. If a court were to find the choice of forum provisions in our Certificate of Incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could adversely affect our business and financial condition.

We or our directors or officers may be subject to securities class action litigation.

In the past, securities class action litigation has often been brought against a company following a decline in the market price of its securities. This risk is especially relevant for us because biotechnology and biopharmaceutical companies have experienced significant stock price volatility in recent years. If we face such litigation, even if ultimately decided in our favor, it could result in substantial costs and a diversion of our management’s attention and resources, which could harm our business.

Our operating results may fluctuate significantly, which makes our future operating results difficult to predict and could cause our operating results to fall below expectations or any guidance we may provide.

Our quarterly and annual operating results may fluctuate significantly, which makes it difficult for us to predict our future operating results. These fluctuations may occur due to a variety of factors, many of which are outside of our control, including, but not limited to:

•        the timing and cost of, and level of investment in, research, development, regulatory approval and commercialization activities relating to RTN-001 or any future product candidates, which may change from time to time;

•        the timing and success or failure of preclinical studies or clinical trials for RTN-001 or any future product candidates or competing product candidates, or any other change in the competitive landscape of our industry, including consolidation among our competitors or partners;

•        coverage and reimbursement policies with respect to RTN-001 or any future product candidates, if approved, and potential future drugs that compete with our products;

•        expenditures that we may incur to acquire, develop or commercialize additional product candidates and technologies;

•        the level of demand for any approved products, which may vary significantly;

•        future accounting pronouncements or changes in our accounting policies;

•        the timing and amount of any milestone, royalty or other payments payable by us or due to us under any collaboration, licensing or other similar agreement; and

•        changes in general market and economic conditions.

The cumulative effects of these factors could result in large fluctuations and unpredictability in our quarterly and annual operating results. As a result, comparing our operating results on a period-to-period basis may not be meaningful. Investors should not rely on our past results as an indication of our future performance.

This variability and unpredictability could also result in our failing to meet the expectations of industry or financial analysts or investors for any period. If our revenue or operating results fall below the expectations of analysts or investors or below any forecasts we may provide to the market, or if the forecasts we provide to the market are below the expectations of analysts or investors, the price of our common stock could decline substantially. Such a stock price decline could occur even when we have met any previously publicly stated revenue or earnings guidance we may provide.

Special Note Regarding Forward-Looking Statements

This prospectus contains forward-looking statements within the meaning of the federal securities laws, which statements involve substantial risks and uncertainties. All statements other than statements of historical fact contained in this prospectus, including statements regarding our future results of operations or financial condition, business strategy and plans, and objectives of management for future operations, are forward-looking statements. In some cases, you can identify forward-looking statements because they contain words such as “anticipate,” “believe,” “can,” “contemplate,” “continue,” “could,” “design,” “estimate,” “expect,” “intend,” “may,” “might,” “objective,” “plan,” “potential,” “predict,” “project,” “shall,” “should,” “target,” “will,” or “would,” or the negative of these words or other similar terms or expressions that concern our expectations, strategy, plans or intentions. These forward-looking statements include, among others, statements relating to our future financial performance, our business prospects and strategy, our market opportunity and the potential growth of that market, our anticipated financial position, our liquidity and capital needs and other similar matters. These forward-looking statements are based on management’s current expectations and assumptions about future events, which are inherently subject to uncertainties, risks and changes in circumstances that are difficult to predict.

Our actual results may differ materially from those expressed in, or implied by, the forward-looking statements included in this prospectus as a result of various factors, including, among others:

•        the fact that our Company is an early stage company with a history of losses, which expects to incur significant expenses and continuing losses for the foreseeable future;

•        the characteristics, safety, and efficacy of RTN-001 and any future product candidates and the potential differentiators of RTN-001 and any such future product candidates compared to alternative therapies;

•        the implementation of our business model and strategic plans for our business, including the development of RTN-001 and any future product candidates;

•        the initiation, timing, progress, and results of our research and development programs, including preclinical studies and clinical trials of RTN-001 and any future product candidates;

•        the timing or likelihood of regulatory filings and approval for RTN-001 and any future product candidates, including our ability to take advantage of abbreviated regulatory pathways;

•        our ability to obtain regulatory approval of RTN-001 and any future product candidates and to meet current or future regulatory standards with respect to any such product candidates, if approved;

•        our expectations regarding the potential market size of RTN-001 or any future product candidates, the number of patients with certain diseases and conditions we intend to treat and the number of patients that we plan to enroll in our clinical trials;

•        developments and projections relating to our competitors and industry;

•        disruption of supply or shortage of raw materials, which could harm our business;

•        the rate and degree of market acceptance and therapeutic benefits of RTN-001 or any future product candidates, if approved;

•        our ability to maintain our license agreements, including our ability to comply with our financial and other obligations pursuant to the terms of such agreements, and our ability to successfully acquire or in-license additional product candidates on reasonable terms;

•        our ability to maintain and establish strategic collaborations with development, regulatory, manufacturing or commercialization expertise;

•        our reliance on third parties to conduct clinical trials of RTN-001 and any future product candidates, and for the manufacture of RTN-001 and any future product candidates for preclinical studies and clinical trials;

•        our ability to establish and develop our marketing, sales and distribution infrastructure to commercialize any products for which we obtain marketing approval;

•        our ability to obtain, establish, maintain, protect and enforce intellectual property and proprietary protection for RTN-001 and any future product candidates and to avoid claims of infringement, misappropriation or other violation of third-party intellectual property and proprietary rights;

•        our ability to hire and retain key management, scientific and engineering personnel and to manage our future growth effectively;

•        our estimates regarding expenses, costs, future revenue, capital requirements and expectations regarding the sufficiency of our capital resources and needs for additional financing;

•        our ability to secure additional financing and continue as a going concern;

•        our expectations regarding government and third-party payor coverage and reimbursement;

•        the volatility of the trading price of our common stock;

•        evolving regulations in the United States and foreign countries and the potential for unfavorable changes to, or failure by us to comply with, regulations and liabilities thereunder;

•        the costs of operating as a public company;

•        our expectations regarding the impact of general economic conditions, including the impact of tariffs and import/export regulations, and geopolitical events;

•        our expectations regarding the period during which we qualify as an emerging growth company under the JOBS Act or a smaller reporting company;

•        our expected use of the net proceeds from this offering; and

•        other factors that may impact our financial results.

We caution you that the forward-looking statements highlighted above do not encompass all of the forward-looking statements made in this prospectus.

We have based the forward-looking statements contained in this prospectus primarily on our current expectations and projections about future events and trends that we believe may affect our business, financial condition, results of operations, prospects, business strategy and financial needs. The outcome of the events described in these forward-looking statements is subject to risks, uncertainties, assumptions and other factors described in the section titled “Risk Factors” and elsewhere in this prospectus. Furthermore, new risks and uncertainties emerge from time to time and it is not possible for us to predict all risks and uncertainties that could have an impact on the forward-looking statements contained in this prospectus. We cannot assure you that the results, events and circumstances reflected in the forward-looking statements will be achieved or occur, and actual results, events or circumstances could differ materially from those described in the forward-looking statements.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this prospectus, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements.

You should read this prospectus and the documents that we reference in this prospectus and have filed as exhibits to the registration statement of which this prospectus forms a part, completely and with the understanding that our actual future results, levels of activity, performance and achievements may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

The forward-looking statements made in this prospectus relate only to events as of the date on which such statements are made. We undertake no obligation to update any forward-looking statements after the date of this prospectus or to conform such statements to actual results or revised expectations, except as required by law.

Use of Proceeds

We estimate that the net proceeds to us from the sale of shares of our common stock in this offering will be approximately $33.8 million, based on the assumed initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us. If the underwriters’ option to purchase additional shares is exercised in full, we estimate that the net proceeds to be received by us will be approximately $39.4 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

Each $1.00 increase (decrease) in the assumed initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the net proceeds that we receive from this offering by approximately $3.1 million, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. Similarly, each increase (decrease) of 1.0 million in the number of shares of common stock offered by us would increase (decrease) the net proceeds that we receive from this offering by approximately $11.2 million, assuming that the assumed initial public offering price remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The principal purposes of this offering are to obtain additional capital to support our operations, to create a public market for our common stock and to facilitate our future access to the public equity markets. We currently intend to use the net proceeds of this offering, together with our existing cash and cash equivalents, as follows:

•        approximately $18 million to complete the Phase 2b clinical trial of RTN-001 in uHTN;

•        approximately $10 million to prepare for, support and advance the planned Phase 3 clinical trial of RTN-001 in uHTN; and

•        the remainder for general corporate purposes and other operating expenses.

We may also use a portion of the net proceeds for acquisitions of, or strategic investments in, complementary businesses, products, services, or technologies. However, we do not have any agreements or commitments to enter into any material acquisitions or investments at this time. Our management will retain broad discretion in the application of the net proceeds we receive from this offering, and investors will be relying on the judgment of our management regarding the application of the net proceeds.

Based on our current operating plan, we believe that our existing cash and cash equivalents, together with the estimated net proceeds from this offering, will be sufficient to fund our operating expenses and capital expenditure requirements through at least the next 21 months.

We have based this estimate on assumptions that may prove to be wrong, and we could use our available capital resources sooner than we expect, which may require us to raise substantial capital primarily through equity or debt instruments, collaborations, licenses, and development agreements.

This expected use of net proceeds from this offering represents our intentions based on our current plans and business conditions, which could change in the future as our plans and business conditions evolve. As a result, our management will have broad discretion over the uses of the net proceeds from this offering and investors will be relying on the judgment of our management regarding the application of the net proceeds from this offering.

The amounts and timing of our actual expenditures will depend on numerous factors, including the progress of our research and development activities, the timing of patient enrollment and evolving regulatory requirements, the time and cost necessary to conduct our ongoing and planned clinical trials and preclinical studies, the results of our preclinical studies and clinical trials, and other factors described in the section titled “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Special Note Regarding Forward-Looking Statements,” as well as the amount of cash used in our operations and any unforeseen cash needs. Therefore, our actual expenditures may differ materially from the estimates described above. We may also find it necessary or advisable to use the net proceeds for other purposes.

We expect the net proceeds from this offering, together with our existing cash and cash equivalents will be sufficient to complete the Phase 2b clinical trial of RTN-001 in uHTN; however, after this offering, we will require substantial capital in order to complete our planned Phase 3 clinical trial of RTN-001 and further advance RTN-001 and any future product candidates through clinical trials, regulatory approval and commercialization. Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through equity or debt instruments or other capital sources, including potential collaborations, licenses and other similar arrangements. However, we may be unable to raise additional funds or enter into such other arrangements when needed on favorable terms or at all.

Pending the use of the proceeds from this offering as described above, we intend to invest the net proceeds from the offering that are not used as described above in investment-grade, interest-bearing instruments such as money market accounts, certificates of deposit, commercial paper and guaranteed obligations of the U.S. government.

Dividend Policy

We have never declared or paid any cash dividends on our common stock. We currently intend to retain any future earnings for use in the operation and expansion of our business, and we do not plan to declare or pay cash dividends on our common stock in the foreseeable future. Any future determination to pay dividends on our capital stock will be at the discretion of our board of directors, subject to applicable laws, and will depend on then existing conditions, including our financial condition, results of operations, capital requirements, general business conditions, and other factors that our board of directors considers relevant. In addition, our ability to pay dividends may be restricted by any agreements we may enter into in the future.

Capitalization

The following table sets forth our cash and cash equivalents and our capitalization as of June 30, 2026:

•        on an actual basis;

•        on a pro forma basis to reflect (i) the automatic conversion of all outstanding shares of our convertible preferred stock into an aggregate of 3,774,119 shares of common stock immediately prior to the closing of this offering and (ii) the filing and effectiveness of our Certificate of Incorporation immediately prior to the closing of this offering; and

•        on a pro forma as adjusted basis to give effect to (i) the pro forma items described immediately above and (ii) our issuance and sale of 3,300,000 shares of common stock in this offering at an assumed initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The pro forma and pro forma as adjusted information below is illustrative only, and our cash and cash equivalents and capitalization following the closing of this offering will be adjusted based on the actual initial public offering price and other terms of this offering determined at pricing. You should read this information in conjunction with our consolidated financial statements and the related notes included elsewhere in this prospectus and the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

____________

(1)      Each $1.00 increase (decrease) in the assumed initial public offering price of $12.00 per share of common stock, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the pro forma as adjusted amount of each of cash and cash equivalents, additional paid-in capital, total stockholders’ equity (deficit) and total capitalization by approximately $3.1 million, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and $2,783,443 of estimated offering expenses payable by us ($200,000 of expenses were paid by us as of June 30, 2026 and appear in the “Actual” column above). Similarly, each increase (decrease) of 1.0 million in the number of shares offered by us would increase (decrease) the pro forma as adjusted amount of each of cash and cash equivalents, additional paid-in capital, total stockholders’ equity (deficit) and total capitalization by approximately $11.2 million, assuming that the assumed initial public offering price remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The outstanding share information in the table above is based on 4,581,599 shares of common stock outstanding as of June 30, 2026, after giving effect to the automatic conversion of all outstanding shares of our convertible preferred stock into an aggregate of 3,774,119 shares of our common stock immediately prior to the closing of this offering, and excludes:

•        1,230,385 shares of common stock issuable upon the exercise of outstanding stock options under our 2024 Plan, with a weighted average exercise price of $2.10 per share;

•        349,930 shares of common stock issuable upon the exercise of outstanding warrants, having a weighted average exercise price of $7.21 per share, which are expected to remain unexercised until after the closing of this offering;

•        126 shares of common stock reserved for future issuance under the 2024 Plan;

•        945,845 shares of common stock reserved for future issuance under our 2026 Plan, which will become effective as of the date of this prospectus; and

•        78,820 shares of common stock reserved for future issuance under the 2026 ESPP, which will become effective as of the date of this prospectus.

Our 2026 Plan and 2026 ESPP provide for annual automatic increases in the number of shares reserved thereunder. See the section titled “Executive Officer and Director Compensation — Equity Incentive Plans” for additional information.

Dilution

If you invest in our common stock in this offering, your ownership interest will be diluted immediately to the extent of the difference between the initial public offering price per share of our common stock in this offering and the pro forma as adjusted net tangible book value (deficit) per share of our common stock immediately after this offering.

Our historical net tangible book value (deficit) as of June 30, 2026 was $(14.9) million, or $(18.48) per share of our common stock. Our historical net tangible book value (deficit) represents our total tangible assets less total liabilities and preferred stock, all divided by the number of shares of our common stock outstanding as of June 30, 2026. Our pro forma net tangible book value (deficit) as of June 30, 2026 was $13.3 million, or $2.89 per share of our common stock. Our pro forma net tangible book value per share represents our total tangible assets less our total liabilities, divided by 4,581,599 shares of our common stock outstanding as of June 30, 2026, after giving effect to the automatic conversion of all outstanding shares of our convertible preferred stock as of June 30, 2026 into an aggregate of 3,774,119 shares of common stock.

After giving further effect to the sale of 3,300,000 shares of common stock in this offering at an assumed initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, and after deducting underwriting discounts and commissions and $2,783,443 of estimated offering expenses payable by us ($200,000 of expenses were paid by us as of June 30, 2026 and appear in historical net tangible book value per share as of June 30, 2026), our pro forma as adjusted net tangible book value as of June 30, 2026 would have been approximately $47.0 million, or approximately $5.97 per share. This represents an immediate increase in pro forma net tangible book value of $3.08 per share to existing stockholders and an immediate dilution in pro forma net tangible book value of $6.03 per share to new investors participating in this offering. Dilution per share to new investors is determined by subtracting pro forma as adjusted net tangible book value per share after this offering from the initial public offering price per share paid by new investors.

The following table illustrates this dilution on a per share basis:

The dilution information discussed above is illustrative only and may change based on the actual initial public offering price and other terms of this offering. Each $1.00 increase (decrease) in the assumed initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) our pro forma as adjusted net tangible book value per share after this offering by $0.39, and would increase (decrease) dilution to new investors in this offering by $0.61 per share, in each case assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. Similarly, each increase of 1.0 million in the number of shares offered by us would increase our pro forma as adjusted net tangible book value per share after this offering by approximately $0.58 and decrease the dilution to new investors by approximately $0.58 per share, and each decrease of 1.0 million in the number of shares offered by us would decrease our pro forma as adjusted net tangible book value per share after this offering by approximately $0.76 and increase the dilution to new investors by approximately $0.76 per share, in each case assuming that the assumed initial public offering price remains the same, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

Except as otherwise indicated, the above discussion and table assume no exercise of the underwriters’ option to purchase additional shares. If the underwriter’s option to purchase additional shares is exercised in full, pro forma as adjusted net tangible book value per share after giving effect to this offering would be approximately $6.27, the increase in pro forma net tangible book value per share to existing stockholders would be $3.38 and the dilution per share to new investors participating in this offering would be $5.73, in each case assuming an initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The following table summarizes, on a pro forma as adjusted basis as of June 30, 2026, the differences between the number of shares of common stock purchased from us, the total consideration paid and the weighted-average price per share paid by existing stockholders and to be paid by the new investors participating in this offering at an assumed initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, before deducting underwriting discounts and commissions and estimated offering expenses payable by us (in thousands, except per share amounts and percentages):

Each $1.00 increase (decrease) in the assumed initial public offering price of $12.00 per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the total consideration paid by new investors in this offering by $3.3 million and, in the case of an increase, would increase the percentage of total consideration paid by new investors to 58.0% and, in the case of a decrease, would decrease the percentage of total consideration paid by new investors to 53.9%, in each case assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and before deducting underwriting discounts and commissions and estimated offering expenses payable by us. Similarly, each increase (decrease) of 1.0 million in the number of shares offered by us would increase (decrease) the total consideration paid by new investors in this offering by $12.0 million and, in the case of an increase, would increase the percentage of total consideration paid by new investors to 62.5% and, in the case of a decrease, would decrease the percentage of total consideration paid by new investors to 47.1%, in each case assuming that the assumed initial public offering price remains the same, and before deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The table above assumes no exercise of the underwriters’ option to purchase additional shares in this offering. If the underwriters’ option to purchase additional shares is exercised in full, the number of shares of our common stock held by existing stockholders would be reduced to 54.7% of the total number of shares of our common stock outstanding after this offering, and the number of shares of common stock held by new investors purchasing common stock in this offering would be increased to 45.3% of the total number of shares of our common stock outstanding after this offering.

The foregoing tables and calculations (other than historical net tangible book value (deficit) calculations) are based on 4,581,599 shares of common stock outstanding as of June 30, 2026, after giving effect to the automatic conversion of all of our outstanding shares of convertible preferred stock into an aggregate of 3,774,119 shares of our common stock immediately prior to the closing of this offering, and excludes:

•        1,230,385 shares of common stock issuable upon the exercise of outstanding stock options under our 2024 Plan, with a weighted average exercise price of $2.10 per share;

•        349,930 shares of common stock issuable upon the exercise of outstanding warrants, having a weighted average exercise price of $7.21 per share, which are expected to remain unexercised until after the closing of this offering;

•        126 shares of common stock reserved for future issuance under the 2024 Plan;

Management’s Discussion and Analysis of Financial Condition and
Results of Operations

You should read the following discussion and analysis of financial condition and results of operations together with our consolidated financial statements and related notes included elsewhere in this prospectus. Some of the information contained in this discussion and analysis or set forth elsewhere in this prospectus, including information with respect to our current plans and strategy for our business and related financing, includes forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those discussed in or implied by these forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those discussed in the section titled “Risk Factors.” See also the section titled “Special Note Regarding Forward-Looking Statements.”

Overview

We are a clinical-stage biopharmaceutical company focused on developing medicines for the treatment of hypertension and other cardiovascular diseases. Our product candidate, RTN-001, is a next-generation, once-daily, oral, small molecule phosphodiesterase-5 (“PDE-5”) inhibitor designed to reduce blood pressure by potentiating nitric oxide signaling, a key mechanism underlying the development and severity of hypertension. While first-generation PDE-5 inhibitors, such as Viagra (sildenafil), were originally studied in cardiovascular indications such as hypertension and angina, we believe they did not have adequate bioavailability and tissue penetration to impact the smooth muscle cells of the central vascular and cardiac tissues and thus failed to achieve clinically meaningful reductions in blood pressure. RTN-001 differs from first-generation PDE-5 inhibitors as it has been specifically engineered to have increased bioavailability and an increased distribution to the muscular arteries in the body such as the aorta and its branches in the central vasculature. In two Phase 2 pilot trials, RTN-001 achieved clinically meaningful placebo-adjusted reductions in systolic blood pressure (“SBP”) and diastolic blood pressure (“DBP”) in patients with hypertension and was generally well tolerated, with no drug-related SAEs reported. We believe RTN-001 has the potential to be an effective treatment for hypertension with a favorable safety profile and thus be part of an anti-hypertensive treatment approach.

Since inception in July 2023, our operations have focused on identifying and developing potential product candidates, conducting research, preclinical studies and clinical trials, organizing and staffing the Company, business planning, establishing our intellectual property portfolio, raising capital, and providing general and administrative support for these operations. We do not have any products approved for sale and have not generated any revenue. We have funded our operations primarily through the sale of equity and equity-linked securities. Since inception to June 30, 2026, we have raised gross proceeds of $31.0 million from the issuance of convertible preferred stock.

We have incurred significant operating losses since our inception. Our ability to generate revenue sufficient to achieve profitability will depend on the successful development and commercialization of one or more of our product candidates, which in the near term we expect to be only RTN-001. Our net losses were $6.3 million and $1.9 million for the fiscal years ended December 31, 2025 and 2024, respectively. Our net losses were $7.5 million and $1.9 million for the six-month periods ended June 30, 2026 and 2025, respectively. As of June 30, 2026 and December 31, 2025, we had an accumulated deficit of $15.8 million and $8.3 million, respectively. We expect to continue to incur significant expenses and increasing operating losses for the foreseeable future in connection with our ongoing activities.

We concluded that we do not have sufficient capital resources to fund our operating plan for approximately twelve months from the date of issuance of the unaudited interim condensed consolidated financial statements included elsewhere in this prospectus, and as a result, there is substantial doubt about our ability to continue as a going concern within the twelve months after the date the unaudited interim condensed consolidated financial statements included elsewhere in this prospectus are issued, and the report of our independent registered public accounting firm on our financial statements as of and for the fiscal year ended December 31, 2025 includes an explanatory paragraph indicating that there is substantial doubt about our ability to continue as a going concern. Our ability to access capital when needed is not assured and if capital is not available to us when, and in the amounts, needed, we may need to delay, scale back or abandon some or all of our development programs and other operations, which could materially affect our business, financial condition and results of operations.

We anticipate that our expenses and capital requirements will increase substantially in connection with our ongoing and planned activities, particularly as we advance the Phase 2b and planned Phase 3 clinical trial in uHTN. In addition, we expect to incur additional costs associated with operating as a public company following the closing of this offering. We expect that our expenses and capital requirements will increase substantially if and as we:

•        conduct our current and contemplated future clinical trials of RTN-001, and conduct preclinical studies and preclinical trials with respect to any future product candidates, including developing our CRO relationships;

•        seek regulatory and marketing approvals for RTN-001 or any of our future product candidates that successfully complete clinical trials;

•        establish and maintain the manufacturing of preclinical and, if approved, clinical supply of RTN-001 and any future product candidates, including developing our CMO relationships;

•        maintain, expand and protect our intellectual property portfolio;

•        expand our operational, financial, and management systems and increase personnel, including personnel to support our preclinical and clinical development, manufacturing and commercialization efforts;

•        establish a sales, marketing and distribution infrastructure in the future to commercialize RTN-001 or any future product candidate for which we may obtain marketing approval;

•        attract, hire, and retain qualified clinical, scientific, operations, commercial, and management personnel;

•        add and maintain operational, financial, and information management systems;

•        navigate any delays in our preclinical studies or clinical trials and regulatory approval negotiations for our product candidates, including as a result of macroeconomic conditions, geopolitical conflicts, or other factors;

•        seek to identify, discover, develop and commercialize additional product candidates; and

•        incur additional legal, accounting or other expenses in operating our business, including the additional costs associated with operating as a public company.

We will need substantial additional funding to support our continuing operations and pursue our growth strategy. As of June 30, 2026 and December 31, 2025, we had cash and cash equivalents of $13.5 million and $18.9 million, respectively. These amounts are not expected to be sufficient to fund our operations for at least twelve months from the date of issuance of the unaudited interim condensed financial statements included elsewhere in this prospectus. See “— Liquidity and Capital Resources.” Until we can generate significant revenue from product sales, if ever, we expect to finance our operations through a combination of equity or debt instruments, collaborations or other strategic transactions. We may be unable to raise additional funds or enter into such other agreements or arrangements when needed on favorable terms, or at all. If we fail to raise capital or enter into such agreements as, and when, needed, we may have to significantly delay, scale back or discontinue the development and commercialization of one or more of our product candidates.

We do not own or operate, and currently have no plans to establish, any manufacturing facilities. We rely, and expect to continue to rely, on third parties for the manufacture of RTN-001 and any future product candidates for preclinical and clinical testing, as well as for commercial manufacture if any such product candidates obtain marketing approval. We are working with our current manufacturers to ensure that we will be able to scale up our manufacturing capabilities to support our clinical plans. In addition, we rely on third parties to package, label, store, and distribute RTN-001, and we intend to continue to rely on third parties if marketing approval is obtained for RTN-001. We believe that this strategy allows us to maintain a more efficient infrastructure by eliminating the need for us to invest in our own manufacturing facilities, equipment, and personnel while also enabling us to focus our expertise and resources on the development of our product candidates.

Based on our current operating plan, we believe that the net proceeds from this offering, together with our existing cash and cash equivalents, will be sufficient to fund our operating expenses and capital expenditure requirements through at least the next 21 months. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. To finance our operations beyond that point, we will need to raise additional capital, which cannot be assured. See “— Liquidity and Capital Resources” below.

Pursuant to the Redux Agreement, we assumed the royalty obligations owed by Redux to Kadmon under the Kadmon Agreement. Such royalty obligations consist of a low-teens percentage of royalties on net sales of RTN-001 and a low-teens percentage of royalties on sublicensing revenue, subject to customary deductions, to be paid each quarter in which net sales are generated or sublicense revenue is received. For more information regarding the Redux Agreement and our Historical Agreements, see “Business — Intellectual Property — Key Agreements.”

Operating Expenses

Research and Development

Research and development expenses consist primarily of costs incurred for our research activities, including our discovery efforts and the development of our product candidates, and include:

•        employee-related expenses, if any, including salaries, related benefits and stock-based compensation expense for employees engaged in research and development functions;

•        fees paid to consultants for services directly related to our product development and regulatory efforts;

•        expenses associated with clinical trials performed by outside vendors or academic collaborators;

•        expenses incurred under agreements with CROs as well as CMOs and consultants that conduct and provide supplies for our preclinical studies and clinical trials;

•        costs associated with clinical and development activities;

•        costs associated with our intellectual property portfolio; and

•        costs related to compliance with regulatory requirements.

We expense research and development costs as incurred. Costs for external development activities are recognized based on an evaluation of the progress to completion of specific tasks using information provided to us by our vendors. Payments for these activities are based on the terms of the individual agreements, which may differ from the pattern of costs incurred, and are reflected in our consolidated financial statements as prepaid or accrued research and development expenses. Upfront and milestone payments for licensing agreements are expensed unless they provide an alternative future benefit, in which case they are capitalized. We currently only have one product candidate. We do not currently track research and development expenses by clinical program, as all of the research and development expenses incurred to date were related to RTN-001.

Research and development activities are central to the anticipated future growth of our business. We expect that our research and development expenses will continue to increase for the foreseeable future as we continue clinical development of RTN-001 and continue to discover and develop additional product candidates. Clinical and preclinical development timelines, the probability of success, and development costs can differ materially from expectations. If any of our product candidates enter into later stages of clinical development, they will generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials.

General and Administrative Expenses

General and administrative expenses consist primarily of personnel-related expenses, including salaries, bonuses, benefits and stock-based compensation for personnel in our executive and finance functions. General and administrative expenses also include professional fees for legal, accounting, auditing, tax and consulting services, insurance costs, travel expenses and facility-related expenses, which include allocated expenses for rent and maintenance of facilities and other operating costs not included in research and development.

We expect that our general and administrative expenses will increase in the near-term as we continue to build a team to support our administrative, accounting and finance, communications, legal and business development efforts. Following this offering, we expect to incur increased expenses associated with being a public company, including costs of hiring additional personnel. accounting, audit, legal, regulatory and tax compliance services, director and officer insurance costs and investor and public relations costs.

Other Income (Expense), Net

Interest Income (Expense)

Interest income for the six-month periods ended June 30, 2026 and 2025 and the fiscal years ended December 31, 2025 and 2024 primarily consists of our investments in money market funds and U.S. treasuries.

Results of Operations

Comparison of the Six Months Ended June 30, 2026 and 2025

The following table summarizes our results of operations for the six-month periods ended June 30, 2026 and 2025:

Research and Development Expenses

Research and development expenses were $6.2 million for the six months ended June 30, 2026, compared to $1.2 million for the six months ended June 30, 2025, an increase of $5.0 million. The increase was primarily driven by costs incurred under agreements with CROs in connection with our ongoing Phase 2b clinical trial for RTN-001, which initiated patient enrollment in October 2025, as well as increased fees paid to scientific consultants and advisors for services related to product development and regulatory activities. In the six months ended June 30, 2025, our research and development activities were focused primarily on chemistry, manufacturing, and controls (“CMC”) related and manufacturing work and scientific consulting in preparation for our Phase 2b clinical trial.

The following table summarizes the components of our research and development expenses for the six-month periods ended June 30, 2026 and 2025:

Clinical trial and CRO costs consist of fees paid to CROs, clinical trial sites and central laboratories in connection with the conduct of our clinical trials of RTN-001, including our Phase 2b clinical trial initiated in October 2025. CMC and drug manufacturing costs consist of fees paid to contract manufacturing organizations (“CMOs”) and other third-party vendors for drug substance and drug product manufacturing, formulation, analytical testing and other CMC-related activities. Scientific consulting and advisory costs consist of fees paid to scientific consultants and advisors for services directly related to our research and development activities. Preclinical and other research and development costs consist of fees paid to vendors for preclinical studies, regulatory consulting and other research and development support services.

All of our research and development expenses relate solely to our single product candidate, RTN-001. As we have only one active development program, we do not allocate research and development expenses by program. We expect our research and development expenses to increase in future periods as we continue to advance RTN-001 through clinical development, including the ongoing Phase 2b clinical trial, and incur higher costs related to clinical trial execution, manufacturing scale-up, and other development activities. These increases will depend on the timing, scope, and outcomes of our development efforts, as well as regulatory requirements and other factors.

General and Administrative Expenses

General and administrative expenses were $1.6 million for the six months ended June 30, 2026, compared to $0.9 million for the six months ended June 30, 2025, an increase of $0.7 million. The increase was primarily driven by personnel-related costs in connection with our planned expansion of personnel to support public company readiness, higher recruiting fees, higher professional fees for accounting, and audit services associated with our preparations for an initial public offering, higher information technology costs, and increased stock-based compensation expense resulting from the vesting of option grants made in the fiscal year ended December 31, 2025. In the six months ended June 30, 2025, general and administrative expenses consisted primarily of legal and consulting costs at a lower level of activity consistent with our earlier stage of development.

Other Income (Expenses), Net

Other income (expense), net was approximately $261 thousand for the six months ended June 30, 2026, compared to $224 thousand for the six months ended June 30, 2025, an increase of $37 thousand. The increase was primarily driven by higher interest income earned on our cash balances, reflecting a larger average cash balance following the completion of our Series B Preferred Stock financing during the fiscal year ended December 31, 2025.

Comparison of the Fiscal Years Ended December 31, 2025 and 2024

The consolidated financial statements as of and for the fiscal year ended December 31, 2025 have been restated to correct an error in our accounting for advance payments made to a CRO, which advance payments were incorrectly recognized as expenses when the related invoices were paid rather than recorded as prepaid expenses and recognized as research and development expense as the related clinical trial activities were performed. The correction reduced previously reported research and development expense, total operating expenses and net loss for the fiscal year ended December 31, 2025 by $2.3 million, and the amounts presented below and discussed in this section reflect the restated amounts. The restatement did not affect our consolidated financial statements for the fiscal year ended December 31, 2024 or our previously reported net cash used in operating activities or cash and cash equivalents. For further information, see Note 3, “Restatement of Previously Issued Financial Statements,” to our consolidated financial statements included elsewhere in this prospectus.

The following table summarizes our results of operations for the fiscal years ended December 31, 2025 and 2024:

Research and Development Expenses

Research and development expenses were $5.1 million for the fiscal year ended December 31, 2025, compared to $1.3 million for the fiscal year ended December 31, 2024, an increase of $3.8 million. The increase was primarily driven by costs incurred under agreements with CROs in connection with the initiation of our Phase 2b clinical trial for RTN-001 in October 2025, as well as increased fees paid to scientific consultants and advisors for services related to product development and regulatory activities. In 2024, our research and development activities were focused primarily on CMC and manufacturing work and scientific consulting in preparation for our Phase 2b clinical trial.

The following table summarizes the components of our research and development expenses for the fiscal years ended December 31, 2025 and 2024:

Clinical trial and CRO costs consist of fees paid to CROs, clinical trial sites and central laboratories in connection with the conduct of our clinical trials of RTN-001, including our Phase 2b clinical trial initiated in October 2025. CMC and drug manufacturing costs consist of fees paid to CMOs and other third-party vendors for drug substance and drug product manufacturing, formulation, analytical testing and other CMC-related activities. Scientific consulting and advisory costs consist of fees paid to scientific consultants and advisors for services directly related to our research and development activities. Preclinical and other research and development costs consist of fees paid to vendors for preclinical studies, regulatory consulting and other research and development support services.

All of our research and development expenses relate solely to our single product candidate, RTN-001. As we have only one active development program, we do not allocate research and development expenses by program. We expect our research and development expenses to increase in future periods as we continue to advance RTN-001 through clinical development, including the ongoing Phase 2b clinical trial, and incur higher costs related to clinical trial execution, manufacturing scale-up, and other development activities. These increases will depend on the timing, scope, and outcomes of our development efforts, as well as regulatory requirements and other factors.

General and Administrative Expenses

General and administrative expenses were $1.8 million for the fiscal year ended December 31, 2025, compared to $1.0 million for the fiscal year ended December 31, 2024, an increase of $0.8 million. The increase was primarily driven by higher professional fees for legal, accounting, and audit services associated with preparations for our initial public offering, increased consulting fees related to general management and advisory services, and increased stock-based compensation expense resulting from option grants made in the fiscal year ended December 31, 2025. In the fiscal year ended December 31, 2024, general and administrative expenses reflected a similar mix of professional fees and consulting costs at a lower level of activity consistent with our earlier stage of development.

Other Income (Expenses), Net

Other income (expense), net was $0.6 million for the fiscal year ended December 31, 2025, compared to $0.4 million for the fiscal year ended December 31, 2024, an increase of $0.2 million. The increase was primarily driven by higher interest income earned on our cash balances, reflecting a larger average cash balance following the completion of our Series B Preferred Stock financing during the fiscal year ended December 31, 2025.

Liquidity and Capital Resources

Sources of Liquidity

To date we have funded our operations primarily through the sale of equity and equity-linked securities. Through June 30, 2026, we have raised approximately $31.0 million of gross proceeds from the issuance of convertible preferred stock. As of June 30, 2026 and December 31, 2025, we had cash and cash equivalents of $13.5 million and $18.9 million, respectively. Our net losses were $6.3 million and $1.9 million for the fiscal years ended December 31, 2025 and 2024, respectively. Our net losses were $7.5 million and $1.9 million for the six-month periods ended June 30, 2026 and 2025, respectively. As of June 30, 2026 and December 31, 2025, we had an accumulated deficit of $15.8 million and $8.3 million, respectively. Since our inception, we have not generated any revenue from product

sales or any other sources and have incurred significant operating losses and negative cash flows from our operations and expect these conditions to continue for the foreseeable future. We have not yet commercialized any product candidates and we do not expect to generate revenue from sales of any products for the foreseeable future, if at all.

Funding Requirements

Our plan of operation is to continue implementing our business strategy, continue development of RTN-001 and continue to expand our research pipeline and our internal research and development capabilities. We expect our expenses to increase substantially in connection with our ongoing activities, particularly as we advance the clinical trials of RTN-001 and related research and development activities. In addition, we expect to incur additional costs associated with operating as a public company following the closing of this offering. Our future capital requirements will depend on many factors, including:

•        the scope, timing, progress, costs, and results of discovery, preclinical development, and clinical trials for RTN-001 and any future product candidates;

•        the number of clinical trials required for regulatory approval of RTN-001 and any future product candidates;

•        the costs, timing, and outcome of regulatory review of RTN-001 and any of future product candidates;

•        the cost of manufacturing clinical and, if approved, commercial supplies of RTN-001 and any future product candidates; the costs and timing of future commercialization activities, including manufacturing, marketing, sales, and distribution, for any of our product candidates for which we receive marketing approval;

•        the costs and timing of preparing, filing, and prosecuting patent applications, maintaining and enforcing our intellectual property rights, and defending any intellectual property-related claims, including any claims by third parties that we are infringing upon their intellectual property rights;

•        our ability to maintain existing, and establish new, strategic collaborations, licensing, or other arrangements and the financial terms of any such agreements, including the timing and amount of any future milestone, royalty, or other payments due under any such agreement;

•        the revenue, if any, received from commercial sales of our product candidates for which we receive marketing approval;

•        expenses to attract, hire and retain, skilled personnel;

•        the potential increase in the number of our employees and establishment of physical facilities to support preclinical studies and clinical trials;

•        the costs of operating as a public company, including expenses related to legal, accounting, and regulatory activities, as well as costs associated with director and officer insurance premiums, investor relations support, and maintaining compliance with exchange listing and SEC requirements;

•        our ability to establish a commercially viable pricing structure and obtain approval for coverage and adequate reimbursement from third-party and government payors;

•        patients’ willingness to pay out-of-pocket for any approved products in the absence of coverage and/or adequate reimbursement from third-party payors;

•        the costs associated with potential product liability claims, including the costs associated with obtaining insurance against such claims and with defending against such claims

•        the effect of competing technological and market developments;

•        the extent to which we acquire or invest in businesses, products and technologies; and

•        the impact of inflation and tariffs, as well as other factors, including economic uncertainty and geopolitical tensions, which may exacerbate the magnitude of the factors discussed above.

A change in the outcome of any of these variables with respect to the development of a product candidate could mean a significant change in the costs and timing associated with the development of that product candidate. As a result, we will need substantial additional funding to support our continuing operations and pursue our growth strategy.

As of June 30, 2026 and December 31, 2025, we had cash and cash equivalents of $13.5 million and $18.9 million, respectively. These amounts are not expected to be sufficient to fund our operations for at least twelve months from the date of issuance of the unaudited interim condensed consolidated financial statements included elsewhere in this prospectus without raising additional capital through equity or debt instruments, collaborations or other strategic transactions. As a result, these conditions and events raise substantial doubt about our ability to continue as a going concern within twelve months after the date the unaudited interim condensed consolidated financial statements included elsewhere in this prospectus are issued.

Our management has concluded that its plans do not alleviate the substantial doubt about our ability to continue as a going concern within twelve months after the date the unaudited interim condensed consolidated financial statements included elsewhere in this prospectus are issued. The unaudited interim condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty. See “Risk Factors — Risks Related to Our Limited Operating History, Business, Financial Position and Capital Requirements — Our recurring losses from operations and financial condition raise substantial doubt about our ability to continue as a going concern and the report of our independent registered public accounting firm on our financial statements as of and for the fiscal year ended December 31, 2025 includes an explanatory paragraph indicating that there is substantial doubt about our ability to continue as a going concern.” Our ability to continue as a going concern is dependent upon our ability to successfully secure sources of financing and ultimately achieve profitable operations.

Based on current operating plans, we believe that the net proceeds from this offering, together with our existing cash and cash equivalents, will be sufficient to fund our operations through at least the next 21 months from the date of this prospectus. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect.

Until such time as we can generate significant revenue from product sales, if ever, we expect to finance our operations from the sale of additional equity or debt instruments, or other capital that comes in the form of strategic collaborations, licensing, or other arrangements. We currently have no credit facility or committed sources of capital. In the event that additional financing is required, we may not be able to raise it on terms acceptable to us, or at all. If we raise additional funds through the issuance of equity or debt securities, it may result in dilution to our existing stockholders. Debt financing or preferred equity financing, if available, may result in increased fixed payment obligations, and the existence of securities with rights that may be senior to those of our common stock. If we incur indebtedness, we could become subject to covenants that would restrict our operations. If capital is not available to us when, and in the amounts, needed, we may need to delay, scale back or abandon some or all of our development programs and other operations, which could materially affect our business, financial condition and results of operations.

If we raise funds through strategic collaboration, licensing or other arrangements, we may relinquish significant rights or grant licenses on terms that are not favorable to us. Our ability to raise additional funds may be adversely impacted by potential worsening global economic conditions and disruptions to, and volatility in, the credit and financial markets in the United States and worldwide. If we are unable to raise additional funds through equity or debt instruments when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market products or product candidates that we would otherwise prefer to develop and market ourselves.

Cash Flows

Comparison of the Six Months ended June 30, 2026 and 2025 and the Fiscal Years Ended December 31, 2025 and 2024

The following table summarizes our cash flows for each of the periods presented:

Operating Activities

During the six months ended June 30, 2026, net cash used in operating activities was $5.4 million, compared to $1.3 million for the six months ended June 30, 2025, an increase of $4.1 million. During the fiscal year ended December 31, 2025, net cash used in operating activities was $7.8 million, compared to $1.8 million for the fiscal year ended December 31, 2024, an increase of $6.0 million.

The increase in cash used in operating activities in the six months ended June 30, 2026 compared to the six months ended June 30, 2025 was primarily driven by higher operating expenditures associated with our ongoing Phase 2b clinical trial of RTN-001, including costs incurred under agreements with CROs and CMOs, and increased general and administrative expenses associated with our preparation for an initial public offering, partially offset by an increase in accounts payable reflecting the timing of vendor payments.

The increase in cash used in operating activities in the fiscal year ended December 31, 2025 compared to the fiscal year ended December 31, 2024 was primarily driven by higher operating expenditures driven by the initiation of our Phase 2b clinical trial for RTN-001, including costs incurred under agreements with CROs and CMOs, and increased general and administrative expenses associated with preparation for our initial public offering, partially offset by an increase in accounts payable.

Investing Activities

There were no investing activities during the six months ended June 30, 2026 and 2025 and the fiscal years ended December 31, 2025 and 2024.

Financing Activities

During the six months ended June 30, 2026, net cash provided by financing activities was approximately $2,300, consisting of $3,322 of proceeds from the exercise of stock options, partially offset by $1,025 of issuance costs paid in connection with our Series B Convertible Preferred Stock financing. During the six months ended June 30, 2025, net cash provided by financing activities was $11.4 million, consisting of net proceeds from the issuance of our Series B Preferred Stock.

During the fiscal year ended December 31, 2025, net cash provided by financing activities was $18.5 million, compared to $3.6 million for the fiscal year ended December 31, 2024, an increase of $14.9 million.

The increase in net cash provided by financing activities in the fiscal year ended December 31, 2025 compared to the fiscal year ended December 31, 2024 was primarily driven by net proceeds of $18.5 million received from the issuance of our Series B Preferred Stock in the fiscal year ended December 31, 2025, compared to net proceeds of $3.6 million received from the issuance of our Series A Preferred Stock in the fiscal year ended December 31, 2024.

Contractual Obligations and Commitments

We enter into contracts in the normal course of business with clinical trial sites, clinical supply manufacturers, CROs, CMOs, and other vendors for clinical trials, research and development services and supplies, and other services and products for operating purposes. These contracts generally provide for termination after a notice period, and, therefore, are cancelable contracts and not separately presented. For additional information regarding our contractual obligations and commitments, see Notes 9 and 10 to our consolidated financial statements included elsewhere in this prospectus.

We are also party to certain license agreements, which contain a number of contractual obligations. Those contractual obligations may entitle us to receive, or may obligate us to make, certain payments. The amount and timing of those payments are unknown or uncertain as we are unable to estimate the timing or likelihood of the events that will obligate those payments. Under the Redux Agreement, we have milestone payment obligations that are contingent upon the achievement of certain development milestones and specified levels of product sales and are required to make certain royalty payments in connection with the sale of products developed under the agreement. We could not estimate the timing or likelihood of achieving the milestones, and accordingly, when such payments will be due, and none of these events were probable to occur as of June 30, 2026. For additional information regarding the Redux Agreement, see “Business — Intellectual Property — Key Agreements” and Note 9 to our consolidated financial statements included elsewhere in this prospectus.

Critical Accounting Estimates

This management’s discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The preparation of the accompanying consolidated financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, expenses and the disclosure of contingent assets and liabilities in our consolidated financial statements. In accordance with GAAP, we evaluate our estimates and judgments on an ongoing basis, including those related to estimates of the fair value of the Company’s common stock and share-based instruments, certain accrued expenses, and the valuation allowance associated with deferred tax assets. We base our estimates on historical experience, known trends and events, and various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

We define our critical accounting policies as those accounting principles that require us to make subjective estimates and judgments about matters that are uncertain and are likely to have a material impact on our financial condition and results of operations, as well as the specific manner in which we apply those principles. While our significant accounting policies are more fully described in Note 2 to our audited consolidated financial statements appearing elsewhere in this prospectus, we believe the following are the critical accounting policies used in the preparation of the accompanying consolidated financial statements that require significant estimates and judgments.

Accrued Research and Development Costs

As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued research and development expenses as of each balance sheet date. This process involves reviewing open contracts and purchase orders, including our site contracts for sites that are participating in ongoing clinical trials, communicating with our personnel to identify services that have been performed on our behalf, and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of the actual cost. The majority of our service providers invoice us monthly in arrears for services performed or when contractual milestones are met and payments are typically due between 30 and 60 days following receipt of the invoice. We make estimates of our accrued expenses as of each balance sheet date based on facts and circumstances known to us at that time. We periodically confirm the accuracy of our estimates with the service providers and make adjustments if necessary.

We base our expenses related to research and development activities on our estimates of the services received and efforts expended pursuant to quotes and contracts with vendors that conduct research and development on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract, and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the research and development expense. In accruing service fees, we estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from our estimate, we adjust the accrual or prepaid balance accordingly. Non-refundable advance payments for goods and services that will be used in future research and development activities are expensed when the activity has been performed or when the goods have been received rather than when the payment is made.

Although we do not expect our estimates to be materially different from amounts incurred, if our estimates of the status and timing of services performed differ from the actual status and timing of services performed, it could result in us reporting amounts that are too high or too low in any particular period.

Stock-Based Compensation

We measure the cost of employee, nonemployee, and director services received in exchange for an award of equity instruments based on the fair value of the award on the date of grant and recognize the related expense over the period during which the employee, nonemployee or director is required to provide service in exchange for the award on a graded-vesting basis.

which is a hybrid between the option pricing method (“OPM”), and the probability-weighted expected return method (“PWERM”). The hybrid method is a combination of PWERM and OPM. The OPM allocates the overall company value to the various share classes based on differences in liquidation preferences, participation rights, dividend policy, and conversion rights, using a series of call options. The call right is valued using a Black-Scholes option pricing model. PWERM employs additional information not used in the OPM, including various market approach calculations depending upon the likelihood of various discrete future liquidity scenarios, such as an initial public offering or sale of the Company, as well as the probability of remaining a private company. In a hybrid method, various exit scenarios are analyzed. A discount for lack of marketability of our common stock is then applied to arrive at an indication of value for our common stock.

In addition to considering the results of these third-party valuations, we considered various objective and subjective factors to determine the fair value of our common stock as of each grant date, which may be a date later than the most recent third-party valuation date, including:

•        the prices of our convertible preferred stock sold to or exchanged between outside investors in arm’s length transactions, and the rights, preferences and privileges of our convertible preferred stock as compared to those of our common stock, including the liquidation preferences of our convertible preferred stock;

•        the progress of our research and development efforts, including the status of preclinical studies and ongoing and planned clinical trials for our product candidates;

•        our stage of development and our business strategy, and material risks related to our business;

•        external market conditions affecting the biopharmaceutical industry, and trends within the biopharmaceutical industry;

•        our financial position, including cash on hand, and our historical and forecasted performance and results of operations;

•        the lack of an active public market for our common stock and our convertible preferred stock;

•        the likelihood of achieving a liquidity event for the holders of our common stock, such as an initial public offering, or a sale of the Company, given prevailing market conditions;

•        the achievement of enterprise milestones, including entering into license agreements;

•        the analysis of initial public offerings and the market performance of similar companies in the biopharmaceutical industry; and

•        the economy in general.

The assumptions underlying these valuations represented management’s best estimate, which involved inherent uncertainties and the application of management’s judgment. As a result, if we used significantly different data and assumptions, our stock-based compensation expense could be materially different.

Following the closing of this offering, the fair value of our common stock will be determined based on the quoted market price of our common stock on the date of option grant.

Internal Control Over Financial Reporting

As described in Note 3 to the consolidated financial statements included elsewhere in this prospectus, in connection with the preparation of our unaudited interim condensed consolidated financial statements for the six months ended June 30, 2026, we identified a material weakness in the design of our internal control over financial reporting related to the accounting for advance payments made to a CRO. Specifically, these advance payments were incorrectly recognized as expenses when the related invoices were paid rather than recorded as prepaid expenses and subsequently recognized as research and development expense as the related clinical trial activities were performed. As a result, we have restated our previously issued consolidated financial statements as of and for the year ended December 31, 2025, as described in Note 3 to the consolidated financial statements. Since the fiscal year ended, December 31, 2025, we have proactively taken steps to improve our internal control over financial reporting,

including hiring a Chief Financial Officer, retaining additional accounting and finance personnel and formalizing and documenting our internal control framework. We have implemented, and continue to undertake, additional steps to address this material weakness, including, but not limited to:

•        hiring and retaining additional accounting and finance personnel with appropriate public company reporting and internal controls expertise;

•        formalizing and documenting our internal control framework, including risk assessment and monitoring activities;

•        engaging third-party advisors to assist in the review of CRO arrangements and related accruals and prepaid balances; and

•        designing and implementing enhanced review, oversight and approval controls.

We cannot assure you that the measures we have taken to date, and are continuing to implement, will be sufficient to remediate the material weakness we have identified or avoid potential future material weaknesses. If the steps we take do not correct the material weakness in a timely manner, we will be unable to conclude that we maintain effective internal control over financial reporting. Accordingly, there could continue to be a reasonable possibility that a material misstatement of our financial statements would not be prevented or detected on a timely basis.

Off-Balance Sheet Arrangements

Since our inception, we did not have, and we do not currently have, any off-balance sheet arrangements as defined under rules and regulations of the SEC.

Recently Issued Accounting Pronouncements

A description of recently issued accounting pronouncements that may potentially impact our financial position and results of operations is disclosed in Note 2 to our consolidated financial statements appearing elsewhere in this prospectus.

We have reviewed all recently issued accounting pronouncements and have determined that, other than as disclosed elsewhere in this prospectus, such standards do not have a material impact on our financial statements or do not otherwise apply to our operations.

Quantitative and Qualitative Disclosures about Market Risks

Interest Rate Risk

Our cash and cash equivalents consist of cash held in readily available checking and money market accounts. We are exposed to market risk related to fluctuations in interest rates and market prices. Our primary exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of United States interest rates. However, because of the short-term nature of the instruments in our portfolio, we do not believe a sudden hypothetical change of 10% in market interest rates would have a material impact on our financial condition or results of operations.

Inflation Risk

Inflation generally affects us by increasing our cost of labor and clinical trial costs. Although we do not believe that inflation has had a material impact on our financial position or results of operations to date, we may experience some effects in the future due to an impact on the costs to conduct clinical trials, labor costs we incur to attract and retain qualified personnel, and other operational costs, which could adversely affect our business, financial condition and results of operations.

Emerging Growth Company and Smaller Reporting Company Status

The JOBS Act permits that an “emerging growth company” may take advantage of the extended transition period to comply with new or revised accounting standards applicable to public companies until those standards would otherwise apply to private companies. We have elected to use the extended transition period under the JOBS

Business

Overview

We are a clinical-stage biopharmaceutical company focused on developing medicines for the treatment of hypertension and other cardiovascular diseases. Our product candidate, RTN-001, is a next-generation, once-daily, oral, small molecule phosphodiesterase-5 (“PDE-5”) inhibitor designed to reduce blood pressure by potentiating nitric oxide signaling, a key mechanism underlying the development and severity of hypertension. While first-generation PDE-5 inhibitors, such as Viagra (sildenafil), were originally studied in cardiovascular indications such as hypertension and angina, we believe they did not have adequate bioavailability and tissue penetration to impact the smooth muscle cells of the central vascular and cardiac tissues and thus failed to achieve clinically meaningful reductions in blood pressure. RTN-001 differs from first-generation PDE-5 inhibitors as it has been specifically engineered to have increased bioavailability and an increased distribution to the muscular arteries in the body such as the aorta and its branches in the central vasculature. In two Phase 2 pilot trials, RTN-001 achieved clinically meaningful placebo-adjusted reductions in systolic blood pressure (“SBP”) and diastolic blood pressure (“DBP”) in patients with hypertension and was generally well tolerated, with no drug-related serious adverse events (“SAEs”) reported. We believe RTN-001 has the potential to be an effective treatment for hypertension with a favorable safety profile and thus be part of an anti-hypertensive treatment approach.

Hypertension is among the most prevalent chronic diseases worldwide and is a leading modifiable risk factor for preventable cardiovascular morbidity and mortality. Even small blood pressure reductions, as low as 5 mmHg, yield measurable improvements in major cardiovascular events and outcomes. Currently, we are developing RTN-001 for the treatment of patients with uncontrolled hypertension (“uHTN”), defined as individuals with blood pressure of 130/80 mmHg or higher while receiving two or more concomitant anti-hypertensive medications; and resistant hypertension (“rHTN”), defined as individuals whose blood pressure does not fall below 130/80 mmHg despite treatment with three or more agents, including a diuretic. In the United States, an estimated 120 million adults, or nearly half of all adults, have hypertension. Because severe hypertension is oftentimes asymptomatic, it is often described by physicians as “the silent killer.” Patients can be either unaware of the severity of their condition or have difficulty remaining compliant with the requisite polypharmacy necessary to control the disease. Persistent elevation of blood pressure is strongly associated with an increased risk of serious clinical consequences, including cardiovascular disease, heart failure, stroke, progressive renal impairment, and other end-organ damage, particularly in patients with other risk factors such as diabetes, obesity and aging. Notwithstanding the broad availability of various antihypertensive therapies, a substantial unmet medical need persists.

RTN-001 was designed to lower blood pressure by enhancing nitric oxide signaling via the nitric oxide-cyclic guanosine monophosphate (“cGMP”) pathway. Nitric oxide is an endogenous vasodilator that directly dilates blood vessels via cGMP activation. Thus, the nitric oxide pathway is a critical component of blood pressure regulation by modulating the level of vascular tone, the degree of contraction of the arterial smooth muscle cells, the major cellular component of the muscular arteries comprising the central vasculature and its branches. PDE-5 is an enzyme that degrades cGMP. By inhibiting cGMP degradation, endogenous nitric oxide-mediated vasoregulatory mechanisms are enhanced. Nitric oxide is also a potent anti-inflammatory molecule, critical for reducing metabolic stress that occurs during the aging process, as well as in medical conditions associated with hypertension such as diabetes, hyperlipidemia and obesity. Enhancing PDE-5 inhibitor-mediated vasodilation is a well-established therapeutic mechanism in penile and pulmonary vasculature tissues, as thinner readily accessible vasculature is involved. As such, first-generation PDE-5 inhibitors are approved for use to treat erectile dysfunction (“ED”) and Type 1 Pulmonary Arterial Hypertension (“PAH”). Notably, first-generation PDE-5 inhibitors were unable to meaningfully reduce blood pressure, which we hypothesize is due to limited biodistribution into the thicker, more compartmentalized, and smooth muscle cell-rich central vascular tissues. RTN-001 was engineered using a proprietary surface chemistry-based platform that enables precise tuning of physicochemical properties to more effectively distribute into cardiovascular smooth muscle tissues than first-generation PDE-5 inhibitors.

In October 2025, we initiated a randomized, multicenter, double-blind, placebo-controlled Phase 2b dose-ranging trial to: (i) identify the minimally effective and optimal dose of the modified release formulation of RTN-001 and (ii) assess the safety and efficacy of RTN-001 for the treatment of adult patients with uHTN while still under treatment with two to five concomitant antihypertensive medications in larger, “real world” settings. The primary endpoint of the trial is the change in peripheral office-seated SBP at week 4 compared to placebo. Key secondary endpoints of the trial include (1) mean change from baseline ambulatory blood pressure monitoring (“ABPM”) over 24 hours and (2) mean change in central blood pressure compared to placebo. Additionally, the trial includes pharmacokinetics and safety assessments to characterize drug

exposure, support dose selection and evaluate the overall safety and tolerability profile of RTN-001. Exploratory endpoints include the assessment of the effect of RTN-001 on renal function and nocturnal hypertension. We believe this trial will enable and inform our planned Phase 3 clinical trial. Initial data is expected in the first half of 2027.

Our Product Candidate: RTN-001

We are developing RTN-001, a next-generation, once-daily, oral, small molecule PDE-5 inhibitor, for the treatment of hypertension. RTN-001 is designed to lower blood pressure by potentiating endogenous nitric oxide levels and signaling, thus favoring the restoration of vascular homeostasis. Nitric oxide ameliorates vascular inflammation and scarring, a key mechanism which, when impaired due to nitric oxide depletion or dysfunctional signaling, can exacerbate hypertension. Hypertension remains the leading modifiable risk factor for cardiovascular morbidity and mortality, yet a substantial proportion of patients fail to achieve blood pressure control while under treatment with multiple concomitant antihypertensive agents. Endothelial dysfunction and impaired nitric oxide signaling contribute to sustained vasoconstriction, vascular inflammation, and fibrosis, which are not directly addressed by many existing therapies.

In diseases where endothelial cell lining of the arterial wall is damaged (Figure 1), such as being exposed to oxidative stress associated with diabetes or atherosclerosis, nitric oxide release is impaired, thus decreasing cGMP signaling. The prevention of cGMP breakdown by inhibiting PDE-5 has yielded FDA-approved vasoregulatory molecules that treat diseases such as PAH and ED.

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*        Vasodilation (widening) and vasoconstriction (narrowing) are opposing processes that regulate blood flow and arterial pressure by altering the smooth muscle cell contractile state, which regulates the diameter of arteries and arterioles. Nitric oxide is a short acting and critical signaling molecule, synthesized by the endothelium, and it is able to passively permeate the adjacent smooth muscle cells leading to cGMP dependent vasodilation. Nitric oxide deficiency occurs when the cells comprising the arterial vascular lining, the endothelium, are damaged. The most common factors causing this damage are also the most common risk factors for heart disease, including hyperlipidemia, diabetes, tobacco use, aging and obesity. This loss of normal nitric oxide, stemming from disruption of normal endothelial function, can result in end organ damage such as myocardial infarction, stroke and kidney disease.

Unlike first-generation PDE-5 inhibitors, RTN-001 was engineered to enable more effective distribution into cardiovascular smooth muscle tissues and potentiate nitric oxide signaling through its key intracellular secondary messenger, cGMP, within the arterial smooth muscle cell. RTN-001 has been engineered using a pharmacokinetics-first drug design framework to be more bioavailable. Bioavailability refers to the proportion of a drug that remains unbound in the bloodstream and is therefore able to enter blood-perfused tissues and exert a biological effect. By increasing its bioavailability, RTN-001 can more effectively penetrate intracellularly into cardiovascular smooth muscle rich tissues, including the aorta, central vascular tree, and the myocardium of the heart. RTN-001 has been administered to 243 participants across nine completed clinical trials, including two Phase 2 pilot trials in hypertension. In these trials, after treatment with RTN-001, clinically meaningful placebo-adjusted reductions in SBP and DBP were observed in patients with hypertension. RTN-001 was generally well tolerated, with no drug-related SAEs reported. The observed adverse event profile was consistent with the established PDE-5 inhibitor class, consisting primarily of mild to moderate, transient events such as headache, flushing, and visual disturbances.

In the Phase 2 pilot trials, clinically meaningful reductions in both peripheral and central SBP and DBP were observed with various doses of an immediate release formulation of RTN-001. In the largest of these trials, Trial 07-08, 40 hypertensive patients were treated with either 5 or 10 mg of an immediate release formulation of RTN-001, in a randomized, double blind, placebo-controlled cross over trial (14 days on placebo, 14 days on RTN-001) with a primary endpoint of change in placebo corrected SBP at 14 days, with key secondary endpoints including safety and pharmacokinetics. While this trial was not powered for statistical significance, due to its small sample size, treatment effects in supine SBP for the 5 and 10 mg RTN-001 groups were statistically significant (p < 0.01 and p < 0.05, respectively) at all time points except for the 24-hour timepoint for 10 mg RTN-001 (p = 0.0532). There were no SAEs observed in this trial. In Trial 07-05, blood pressure reduction effects were observed in patients with hypertension receiving up to four concomitant antihypertensive medications. Reductions in both peripheral and central blood pressure were also observed at trough, which is the lowest serum concentration of drug measured right before the next dose is given. Across these trials, reductions in blood pressure were observed as early as one hour post-dose. Reducing central blood pressure has been shown epidemiologically to have a positive correlation with reduced cardiovascular events, in particular, a decrease in the incidence of stroke. The results of Trial 07-05 and Trial 07-08 may not be predictive of the outcome of our Phase 2b dose-ranging trial or our planned Phase 3 clinical trial of RTN-001 due to both the larger patient populations of those clinical trials and the differences in clinical trial design that may be required. As a result, we cannot predict how RTN-001 will perform in ongoing and future clinical trials.

Our ongoing Phase 2b clinical trial uses a modified-release formulation of RTN-001, which is intended to provide improved 24-hour blood pressure control enabling once-daily dosing, and reducing previously observed mild to moderate and transient side effects seen in first-generation PDE-5 inhibitors by prolonging the rise to reach maximum pharmacokinetic concentrations (“Cmax”), and also reducing patient-to-patient pharmacokinetic variability, which we believe has the potential to translate into better patient tolerability and outcomes. Initial data is expected in the first half of 2027.

In addition to development of RTN-001 for the treatment of hypertension, we plan to expand the clinical development of RTN-001 into additional cardiovascular or renal indications where the underlying disease pathology can be addressed by potentiating nitric oxide signaling in cardiac, renal and vascular tissues in a diversity of arterial vascular beds. We also intend to explore combination treatments of RTN-001 with approved generic or off patent molecules that has the potential to act synergistically with other hypertension therapies as well as other cardiovascular and renal indications.

Our Team and Corporate History

We were founded in 2023 by a leadership team with significant experience in surface chemistry technologies and small molecule drug discovery and development. Dr. Paul Sweetnam, our Chief Scientific Officer (“CSO”), was the CSO at Surface Logix, Inc., a Delaware corporation (“Surface Logix”), where he, along with three other members of the Retension development team, led the conceptualization, invention and early development of RTN-001. In April 2011, Eric Keller, our Chief Executive Officer (“CEO”), led Surface Logix’s acquisition by Nano Terra, Inc. (“Nano Terra”) where he served in the role of CEO, the establishment of NT Life Sciences, LLC (“NT Life”), a joint venture between a subsidiary of Nano Terra and Kadmon Corporation LLC, a Delaware limited liability company (f/k/a Kadmon Pharmaceuticals, LLC) (“Kadmon”), and the licensing of RTN-001 and other compounds to Kadmon through a sublicense agreement with NT Life. In 2019, Kadmon entered into an exclusive sublicense agreement for RTN-001 and other compounds with Redux Therapeutics, LLC, a Massachusetts limited liability company (“Redux”), a therapeutic asset acquisition and development company. Mr. Keller and Dr. Sweetnam, our CEO and CSO, respectively, are each a manager of Redux. In 2021, Kadmon’s parent entity was acquired by Sanofi S.A. (“Sanofi”), and Kadmon became a wholly owned subsidiary of Sanofi. In 2023, Retension IP, a wholly-owned subsidiary of the Company and formerly a subsidiary of Redux, entered into a sublicense agreement with Redux, pursuant to which we were granted an exclusive, worldwide, royalty-bearing right and license to develop, manufacture and commercialize RTN-001. We also retain ownership of all clinical data arising from the nine completed clinical trials conducted by Surface Logix, including the two Phase 2 pilot trials for the treatment of hypertension.

Our management team is advised by our Scientific Advisory Board, which is composed of physicians and investigators with expertise in hypertension, nephrology and cardiology. Our Scientific Advisory Board provides us with insight and advice on the clinical development of RTN-001, including the diagnosis and management of uHTN and rHTN, cardiorenal disease and the design and conduct of clinical trials to evaluate cardiovascular-related diseases, and we consult with individual members of our Scientific Advisory Board from time to time on matters within their respective areas of expertise. For additional information regarding the members of our Scientific Advisory Board, see “Management — Scientific Advisory Board.”

Our Strategy

Our goal is to develop and commercialize RTN-001 as a differentiated therapeutic option capable of overcoming the limitations of current antihypertensive treatments for patients with hypertension. We are also exploring RTN-001’s utility across other cardiovascular or renal indications. Key elements of our strategy include:

•        Advance RTN-001 through clinical development for the treatment of hypertension.    We are conducting a randomized, double-blind, placebo-controlled Phase 2b clinical trial to evaluate the safety and efficacy of a modified formulation of RTN-001 in patients with uHTN with initial data expected in the first half of 2027. Hypertension is one of the most common chronic conditions globally, where an estimated 120 million adults, or nearly half of all adults in the United States, had hypertension in 2020. Following completion of our Phase 2b clinical trial, we plan to engage with the FDA in an end-of-Phase 2 meeting and, if supported by the data, initiate a Phase 3 clinical trial.

•        Develop RTN-001 for additional indications where dysregulation of nitric oxide-cGMP signaling contributes to disease pathophysiology.    We believe RTN-001 has the potential to be developed beyond hypertension into additional indications in which impaired nitric oxide-cGMP signaling is believed to be involved, including cardiovascular or renal indications.

•        Explore combination treatments of RTN-001 with approved generic or off patent molecules.    We believe RTN-001 has the potential to act synergistically or additively with other hypertension therapies to more effectively and/or safely treat hypertension as well as other cardiovascular and renal indications.

•        Opportunistically evaluate strategic partnerships to maximize the value of RTN-001.    As we advance the development of RTN-001 and continue to generate additional clinical data, we intend to evaluate the best path for maximizing the value of RTN-001. For certain geographies, we may opportunistically enter into strategic partnerships to accelerate the development and maximize the commercial potential of RTN-001.

•        Selectively evaluate opportunities to expand our pipeline beyond RTN-001.    Our team has experience in various aspects of drug discovery, clinical development, business development and commercialization. We will continue to leverage our team’s expertise to selectively evaluate potential strategic partnerships, collaborations, licenses and acquisitions to expand our pipeline, particularly in cardiovascular indications.

Background on Hypertension

Hypertension is defined by the American College of Cardiology and the American Heart Association (“AHA”) as resting peripheral blood pressure greater than or equal to 130 mmHg when the heart is contracting, known as systolic blood pressure, or greater than or equal to 80 mmHg when the heart is relaxed, known as diastolic blood pressure. Long-term data from the Antihypertensive and Lipid-Lowering Treatment to Prevent Heart Attack Trial (“ALLHAT”) study published in 2002 demonstrates that an incremental 5 mmHg reduction in SBP, which was a clinically meaningful endpoint accepted by the FDA, correlates with a 10% reduction in major cardiovascular outcomes.

Hypertension is one of the most common chronic conditions globally and is a major modifiable risk factor for cardiovascular morbidity and mortality, as well as a modifiable risk factor to prevent a variety of diseases related to end organ damage such as renal disease. Despite long-standing clinical awareness and the availability of multiple treatment classes, hypertension remains widely prevalent, inadequately diagnosed and/or treated — even among patients taking up to five antihypertensive medications and/or unable to tolerate the polypharmacy needed to reach blood pressure goals. The World Health Organization estimates that approximately 1.4 billion adults aged 30 to 79 years worldwide had hypertension in 2024. According to the Global Burden of Disease Study 2021, approximately 10.8 million cardiovascular deaths worldwide were due to high SBP in 2021. In the United States, an estimated 120 million adults, or nearly half of all adults, had hypertension in 2020. Of adults with hypertension, approximately 50% were receiving treatment for hypertension. About 30 million patients, or roughly half of those taking anti-hypertensive medications, fail to achieve guideline-recommended blood pressure goals. Approximately 10 million patients fail to achieve guideline-recommended blood pressure goals despite being on three or more anti-hypertensive medications and may require additional antihypertensive medications. This population is often referred to as having rHTN. Notably, chronic kidney disease (“CKD”) is considered both a cause and a result of rHTN with approximately 33% of rHTN patients having CKD. Conversely, in patients with CKD, between one-third to one-half have rHTN. The inability of patients to reach individual blood pressure target goal contributes to increased rates of cardiovascular events, end-organ damage and premature mortality, costing the United States healthcare system an estimated $131 billion each year. In 2023

alone, hypertension contributed to approximately 664,470 deaths in the United States, underscoring its public health impact. Clinical evidence supports that even modest reductions in SBP can meaningfully reduce cardiovascular risk. Clinical studies have further highlighted the importance of achieving consistent, 24-hour blood pressure control, as elevated nighttime blood pressure is strongly associated with increased cardiovascular risk. These findings reinforce the need for therapeutic approaches that utilize a differentiated mechanism of action capable of delivering sustained blood pressure reductions.

Recent regulatory and clinical guideline developments have materially improved the commercial and development outlook for novel antihypertensive therapies. Current FDA guidance, established in 2008 and 2011, clarified a streamlined approval pathway for antihypertensive drug development by recognizing blood pressure reduction as an established surrogate endpoint for decreased cardiovascular risk and, in many situations, no longer requires long and expensive pre-approval cardiovascular outcomes trials. AHA guidelines lowered treatment targets to 130/80 mmHg, which have expanded the diagnosed and treatable population for hypertension, increasing demand for new therapeutic options. FDA guidance also supports evaluation of antihypertensive therapies in patients receiving multiple antihypertension medications, enabling potential approval for use across the broader hypertension population rather than limiting the indication to uncontrolled or resistant hypertension subsets.

Taken together, the continued high prevalence of hypertension, the challenges many patients face in achieving guideline-recommended targets — with approximately 70% of all treated hypertensive patients in the United States in 2020 failing to achieve their blood pressure goal — and the economic burden associated with the treatment of hypertension underscores a substantial unmet medical need for new treatment options. Innovative therapies with differentiated mechanisms and the potential to complement existing standards of care may help more patients achieve durable blood pressure control and reduce the long-term burden of hypertension-related complications.

The Vascular System

The vascular system is a network of arteries, arterioles, capillaries, venules, and veins that directs and regulates blood flow. Arteries and arterioles play a central role in blood pressure control by regulating vascular resistance, which is largely determined by the contractile state of vascular smooth muscle tissues within the vessel wall (Figure 2).

Large elastic arteries, such as the aorta and major conduit vessels, support blood flow from the heart and influence central blood pressure, while smaller resistance arteries and arterioles regulate peripheral vascular resistance and regional blood flow. Together, these vascular compartments determine both central and peripheral blood pressure profiles, which are increasingly recognized as distinct but may contribute to cardiovascular risk.

The arterial wall is composed of three primary layers: the intima, media (containing elastic tissue and smooth muscle tissue), and externa (Figure 2). The intima contains the endothelial cell layer, which serves as a critical regulator of vascular homeostasis through the release of vasoactive mediators. The media is composed predominantly of vascular smooth muscle cells arranged circumferentially around the vessel lumen. Contraction and relaxation of these smooth muscle cells directly control vessel diameter and, consequently, vascular resistance and blood pressure. The externa provides structural support and contains fibroblasts, nerves, and microvasculature that contribute to vessel integrity and signaling.

The relative thickness, cellular composition, and functional importance of these layers vary substantially across the vascular system, with large elastic arteries, pulmonary arteries and resistance arterioles all exhibiting distinct structural and biomechanical properties (Figure 3). These differences influence not only the regulation of vascular tone, but also the pharmacokinetic and pharmacodynamic behavior of drugs that act within the vascular wall. For example, first-generation PDE-5 inhibitors demonstrated vascular activity in tissues such as the penile and pulmonary vasculature, where thinner vessel walls and lower elastin content facilitated drug penetration to vascular smooth muscle tissues. In contrast, in thicker, more structurally complex and elastin heavy vascular tissue that comprise much of the systemic circulation, these agents exhibited limited diffusion through the vessel wall, reducing effective engagement of smooth muscle tissues within the medial layer.

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*        Cross section of a large elastic artery. Image depicts a large artery (i.e., aorta) with basal lamina and intimal layer (endothelium) the outer layer facing lumen and multiple layers smooth muscle each separated by an elastic fiber layers. (A) High magnification image of the elastin layers (red) in a large artery (20 µm). A cross-section of the penile erectile tissue

          corpora cavernosa consists of a meshwork of interconnected blood-filled sinusoids (vascular spaces) lined by endothelium and separated by trabeculae of smooth muscle and collagen. (B) High magnification image of this meshwork structure (20 µm).

Normal vascular tone reflects a balance between contracting and dilating signals acting on vascular smooth muscle tissue. These signals arise from neurohormonal pathways, circulating factors, and endothelial-derived mediators. Endothelial-dependent vasodilation is particularly important for maintaining arterial compliance and limiting excessive vascular resistance.

In hypertension, structural and functional changes occur throughout the vascular system. These include increased vascular smooth muscle tone, reduced vasodilatory capacity, reduced production of nitric oxide by endothelial cells and progressive arterial stiffening. Such changes contribute to sustained elevations in blood pressure and increased cardiac workload and may reinforce hypertension over time.

Balancing reactive oxygen species (“ROS”) and eliminating inflammatory molecules requires maintaining a delicate redox equilibrium, where ROS signaling functions normally without accumulating to levels that damage tissues and trigger chronic inflammation. For example, oxidative stress induced by endothelial nitric oxide synthase (“eNOS”) uncoupling plays a notable role in the pathogenesis of arterial hypertension, which is a highly prevalent cardiovascular risk factor, as discussed in detail above, of morbidity and mortality.

Increasing clinical attention has been directed toward the distinction between peripheral blood pressure, typically measured at the brachial artery, and central blood pressure within the aorta and proximal arterial tree. Central blood pressure more directly reflects the load experienced by the heart and cerebral circulation and has been shown in multiple studies to correlate closely with cardiovascular outcomes. Therapeutic strategies capable of improving vascular function across both central and peripheral compartments may therefore offer meaningful advantages in long-term cardiovascular risk reduction.

Collectively, these features highlight the central role of vascular smooth muscle tissue regulation and endothelial function in blood pressure control. Disruption of normal vasodilatory signaling within the arterial wall can increase vascular resistance, reduce arterial compliance, and contribute to sustained hypertension, providing a biologic foundation for therapies that target vascular tone and endothelial-dependent mechanisms.

Current Treatment Landscape

Hypertension is commonly managed through a combination of lifestyle modification and medications, with current clinical guidelines targeting blood pressure levels below 130/80 mmHg. When lifestyle measures are insufficient, physicians initiate treatment with established antihypertensive drug classes, including angiotensin-converting enzyme (“ACE”) inhibitors, angiotensin receptor blockers (“ARBs”), beta blockers, calcium channel blockers, and thiazide diuretics. These agents are often used in combination, as many patients require two or more medications to achieve guideline-recommended blood pressure goals.

For patients with CKD (estimated Glomerular Filtration Rate (“eGFR”) <60 ml/min per 1.75 m2) 2021 Kidney Disease Improving Global Outcomes (“KDIGO”) guidelines, which have been accepted by AHA, have lowered target SBP from 130 mm Hg to 120 for most non-dialysis CKD patients, thus increasing the need for additional and potent anti-hypertensive treatments that can be given safely to this medically complex patient population. Management of rHTN patients with CKD can be complex due to the high prevalence of comorbidities (such as diabetes, hyperlipidemia and obesity), polypharmacy and side effects of current therapies. Current AHA guidelines for CKD patients with hypertension recommend first-line use of an angiotensin converting enzyme inhibitor (“ACE inhibitor”) or angiotensin receptor blocker (“ARB”), but not both), especially in the presence of albuminuria. Given the increased incidence of hyperkalemia with inhibition of the renin angiotensin aldosterone (“RAAS”) axis, oftentimes a loop diuretic is added. By definition, rHTN patients need additional anti-hypertensive treatment and while mineralocorticoid receptor antagonists (“MRAs”) such as spironolactone or aldosterone synthase inhibitors can be effective, additional electrolyte abnormalities such as hyperkalemia and hyponatremia are prevalent and require close monitoring. RTN-001 inhibits PDE-5 and acts through the nitric oxide-cGMP pathway, a mechanism that is independent of the RAAS axis, and

accordingly we would not expect it to be associated with electrolyte abnormalities and associated monitoring. RTN-001 has not been evaluated in patients with CKD, and any benefit to this population relative to aldosterone-targeted therapies has not been established.

Despite the availability of multiple therapeutic classes, hypertension often remains difficult to control because its pathophysiology involves the dysregulation of several interconnected organ systems, including renal, cardiovascular, endocrine, and central nervous system. As a result, physicians typically initiate treatment with antihypertensive agents selected primarily from the following five drug classes, which may later be combined with other therapies if the patient’s target blood pressure is not successfully achieved with the initial treatment. Key limitations of existing therapeutic classes in reducing blood pressure are set forth in Figure 4 below:

Nitrates, which act as nitric oxide donors to activate soluble guanylate cyclase (“sGC”), and sGC stimulators, which directly target the enzyme to increase cGMP production, also target the nitric oxide-cGMP pathway to induce vasodilation, but are currently not FDA-approved for chronic systemic hypertension. Nitrates are primarily indicated for angina and sGC stimulators are approved for pulmonary hypertension and heart failure. Both classes can cause reflex tachycardia or hypotension, which limits their use for long-term systemic blood pressure control compared to ACE inhibitors or ARBs.

Treatment strategies continue to evolve as clinicians seek more durable and consistent blood pressure control, including greater emphasis on understanding differences between central and peripheral blood pressure and their respective associations with cardiovascular outcomes. While endothelial dysfunction and impaired nitric oxide signaling are increasingly recognized as a core mechanism in hypertension, they are not directly targeted by currently approved antihypertensive drug classes, which primarily act through volume reduction, RAAS modulation, or calcium-channel blockade.

The Role of Nitric Oxide Deficiency in Hypertension

Nitric oxide is a naturally produced vasodilator and a key regulator of vascular tone and blood pressure control. Within the vascular endothelium, endothelial nitric oxide synthase produces nitric oxide, which activates cGMP signaling in vascular smooth muscle tissue and promotes vasodilation. This pathway plays an essential role in maintaining healthy vascular function and represents a distinct and complimentary mechanism compared to existing antihypertensive agents (Figure 5).

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*        Schematic figure of the nitric oxide-cGMP pathway. Nitric Oxide is synthesized by nitric oxide synthase in endothelial cells, diffuses through extracellular matrix (e.g., elastin and laminin) and smooth muscle plasma membrane. Once inside the smooth muscle cell, it activates guanylate cyclase which in turn increase intracellular cGMP. cGMP mediates relaxation of these cells resulting in the reduction of blood pressure. RTN-001 blocks the breakdown of cGMP by PDE-5 thereby enhancing endogenous cGMP signaling.

Nitric oxide is critical to regulation of vascular tone by diffusing, as a gaseous signaling molecule, into the underlying smooth muscle cells. The arterial endothelium acts as a mechanosensor, releasing nitric oxide, which is synthetized via eNOS or NOS3. Unlike membrane bound receptors, the primary receptor for nitric oxide is sGC located in the cytosol of smooth muscle cells. When nitric oxide binds to sGC, it increases that enzyme’s activity by one hundred-fold and activated sGC converts guanosine triphosphate (“GTP”) to cGMP. Accumulating cGMP acts primarily through protein kinase G (“PKG”), which promotes Ca++ sequestration and also activates myosin light chain phosphatase, directly inducing relaxation, independent of calcium concentration. In healthy physiologic states, the signal is transient and endogenous PDE-5 acts as a nitric oxide “off” switch to hydrolyze cGMP to an inactive form.

In settings where the arterial vasculature is abnormal or under stress (such as hypertension, diabetes, smoking, hyperlipidemia, and aging), a highly selective and potent inhibition with a PDE-5 inhibitor such as RTN-001 may prevent the degradation of cGMP and may potentiate endogenous nitric oxide levels.

A reduction in nitric oxide availability, a component of endothelial dysfunction, is increasingly recognized as an important contributor to the development and progression of several cardiovascular-related diseases, including hypertension. Nitric oxide production can be reduced by lower activity of nitric oxide synthase, the enzyme that produces nitric oxide in blood vessels, as well as by oxidative stress, age-related vascular changes, and cardiovascular risk factors such as smoking. As nitric oxide levels decline, vascular vasodilatory capacity diminishes, resulting in increased vascular resistance and elevated blood pressure.

Because cGMP is a key second messenger in this pathway, we believe therapeutic approaches restoring nitric oxide-cGMP signaling by increasing endogenous nitric oxide availability or enhancing downstream cGMP signaling can be highly effective in restoring vascular homeostasis and repairing pathologic nitric oxide-cGMP uncoupling. Traditional nitric oxide-donating therapies, including organic nitrates, have demonstrated that enhancing nitric oxide signaling can reduce central blood pressure. However, these agents have thus far been limited by short pharmacologic duration, tolerance development, and inconsistent blood pressure effects.

Another approach to potentiate the effects of nitric oxide is to inhibit PDE-5, an enzyme that degrades cGMP in vascular smooth muscle tissue. Inhibiting PDE-5 can increase and prolong cGMP signaling downstream of nitric oxide, thereby enhancing nitric oxide-mediated vasodilation without directly impacting the levels of nitric oxide. Accordingly, we believe approaches designed to enhance nitric oxide-cGMP signaling downstream rather than directly donate nitric oxide may support more consistent blood pressure control in patients.

The ability of PDE-5 inhibition to promote vascular homeostasis is based on its ability to preserve an endogenous modulatory signaling system that has been altered by exogenous disease processes such as hyperlipidemia, inflammatory reactive oxidative stress, hypertension, atherosclerosis, and aging. PDE-5 inhibition does not create cGMP; this mechanism of action prevents the destruction or hydrolysis of existing cGMP by inhibiting PDE-5 enzymatic activity. This mechanism of action relies on the body’s own natural pulsatile arterial endothelial nitric oxide production (endogenous nitric oxide synthesized by eNOS), elevating cGMP levels within a physiologic range. In comparison, external nitrates are prodrugs that are metabolized into nitric oxide and can cause sGC to produce an exogenous, supraphysiologic “surge” of cGMP.

Limitations of First-Generation PDE-5 Inhibitors

Inhibition of PDE-5 has been demonstrated to increase cGMP levels and enhance smooth-muscle relaxation, which enhances the physiologic effects of nitric oxide on vascular tone and blood pressure regulation. Because PDE-5 inhibition acts downstream by reducing cGMP breakdown, its pharmacologic effect is influenced by the level of upstream nitric oxide-cGMP pathway activity.

This therapeutic approach has been validated by existing commercial therapies, such as Viagra, in ED and PAH. Initially, PDE-5 inhibitors, including Viagra, were explored for systemic blood pressure reduction. However, these agents did not achieve consistent reductions in blood pressure, which we believe was due to insufficient distribution to cardiovascular tissues relevant to hypertension. Their use in hypertension has therefore remained limited, despite the underlying mechanistic rationale.

Our Solution

RTN-001 is designed to address key limitations of first-generation PDE-5 inhibitors, including their limited distribution to cardiovascular tissues and failure to achieve clinically meaningful reductions in blood pressure. A proprietary biophysical chemistry approach was used to optimize tissue distribution, non-target protein interactions, absorption, half-life and pharmacokinetic and pharmacodynamic properties, supporting sustained effects on vascular smooth muscle.

Molecular interactions occur at biological surfaces, including those formed by proteins, lipids, and aqueous environments. Characterizing how drug candidates behave at these interfaces provides insight into protein binding, membrane absorption and permeability, and tissue distribution, helping guide molecular design decisions during compound optimization and development. In particular, increasing the flexibility of molecular fragments (“Modulons”) can facilitate a greater range of dynamic spatial conformations to optimize the pharmacodynamic properties of small drug molecules.

The design of RTN-001 was optimized using a biophysical chemistry platform (the “Modulon Platform”) consisting of two key technologies: (1) a surface chemistry approach using self-assembled monolayers (“SAMs”) which is a highly versatile, molecular-level tool that is used to build diverse, functionalized biological surfaces by

controlling surface properties like hydrophobicity, charge, and chemical functionality; and (2) a medicinal chemistry approach that modifies Modulons to control interactions between small molecules with water, lipids, proteins, and cell surfaces. The Modulon Platform facilitates a rational and iterative approach to drug optimization (Figure 6).

Generated by a proprietary structure and biophysical chemistry-based platform that enables precise tuning of physicochemical properties, RTN-001 was originally developed from a biochemically validated target and scaffold and designed using the Modulon Platform to minimize off-target protein interactions and increase free fraction of drug in smooth muscle tissue and increase exposure to free drug in vascular smooth muscle tissue, improve permeability within arterial tissue. The result is a distribution profile that potentially differentiates RTN-001 from earlier PDE-5 inhibitors, which were not designed for prolonged engagement of large-vessel vascular tissues.

Collectively, we believe the initial design principles utilized to engineer RTN-001 during discovery and clinical trial results to date support RTN-001’s potential as a differentiated therapeutic candidate for hypertension, where potentiated nitric oxide signaling in cardiovascular tissues is an important consideration that is not addressed by current available treatment options.

With the current approaches to blood pressure control remaining unchanged, we believe our next-generation PDE-5 inhibitor has the potential to serve as a differentiated and targeted option for use both as monotherapy and in combination with existing antihypertensive agents across a broad range of patients.

Based on data from preclinical studies performed by Surface Logix, it was observed that Levitra exhibited high binding to smooth-muscle-associated proteins, which results in off-target protein binding within the extracellular matrices, which we believe would limit drug penetration and reduce the amount of free drug available to reach target

cells deeper within the vascular wall. RTN-001 was designed to minimize these interactions, resulting in a higher proportion of unbound active drug reaching vascular smooth muscle tissues responsible for regulating vascular tone and blood pressure.

Comparative surface plasmon resonance (“SPR”) protein-binding assays demonstrated key distinctions between RTN-001 and Levitra, a first-generation PDE-5 inhibitor (Figure 7). While RTN-001 and Levitra were observed to have similar affinity for common plasma protein binding (albumin, α-glycoprotein), RTN-001 was observed to have significantly lower binding to arterial extracellular matrix proteins in the vascular smooth muscle tissues, including elastin and laminin. Levitra exhibited higher levels of binding across multiple plasma, cytoskeletal, and smooth-muscle-associated proteins. This reduced binding to vascular proteins may help preserve greater free-drug availability at the intended site of action within the arterial compartment, supporting the rationale that RTN-001 may be less bound by vascular proteins and therefore may be better able to reach and engage its target in the smooth muscle tissues of the arterial wall.

Based on data from Levitra’s preclinical studies reported in its NDA submitted to the FDA in 2003, the overall drug exposure (“AUC”) of 1 mg 14C-labeled-Levitra in cardiovascular smooth muscle tissues, including the aorta and heart, over a 24-hour period following administration to rats was less than or equal to 0.5 µg-equivalents/g tissue/1 mg drug.

In a preclinical quantitative tissue-distribution study using 14C-labeled RTN-001 measuring AUC over a 24-hour period following administration of 5 mg/kg (~1.375 mg) to rats, RTN-001 was observed to achieve greater than 4.25 µg-equivalents/g tissue/1 mg drug in cardiovascular smooth muscle tissues in male rats, in which the highest non-excretory tissue concentrations were observed in the aorta and heart (Figure 8). We believe that the resulting high level of free drug availability of RTN-001 in cardiovascular smooth muscle supports our expectation that RTN-001 may more effectively distribute to cardiovascular smooth muscle tissues than have been observed previously. These cardiovascular smooth muscle tissues play an important role in blood pressure regulation.

RTN-001 is metabolized in vivo by liver microsomes via enzyme CYP3A4 to produce RTN-146, which compared to RTN-001 has similar selectivity and a similar half-maximal inhibitory concentration (“IC50”) (a widely used pharmacological measure to quantify how much of a drug is needed to inhibit a biological process or target by half). While RTN-146 is present at greater plasma concentrations than RTN-001 and is strongly correlated with PDE-5 inhibitor class-related adverse events, it does not exhibit the tissue distribution characteristics and blood pressure reductions observed with RTN-001.

In head-to-head studies performed by Surface Logix using a spontaneously hypertensive rat model, RTN-001 was observed to produce greater dose-responsive reductions in SBP than those observed with first-generation PDE-5 inhibitors (Figure 9).

In Trial 07-08, RTN-001 was observed to (i) show a statistically significant mean placebo-adjusted reduction in SBP over eight hours of –8.8 mmHg (p-value =0.0019) and a statistically significant maximal placebo-adjusted reduction in SBP of –12.8 mmHg (p-value <0.0001) and (ii) produce a sustained reduction in blood pressure (Figure 10). In contrast, published data for Levitra show a mean maximal placebo-adjusted reduction in standing SBP of –2.0 mmHg and -5.0 mmHg at a 5 mg dose and 10 mg dose, respectively, and a maximal placebo-adjusted reduction in SBP of –5.0 mmHg, which were not statistically significant (although one patient experienced a decrease of >30.0 mmHg after administration of a 5 mg and 10 mg tablet). We believe that these data support the mechanistic rationale that reduced binding to cardiovascular smooth muscle tissue may help preserve higher free-drug fraction available to reach the arterial compartment and contribute to RTN-001’s vascular-tissue selectivity.

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*        Absolute change in SBP over time on day 1 following administration of RTN-001 at the doses shown in Figure 10.

RTN-001 Clinical Development

Clinical Data in Hypertension

RTN-001 has been evaluated in two randomized, placebo-controlled Phase 2 pilot trials (Trial 07-05 and Trial 07-08) in adults with hypertension receiving up to four concomitant antihypertensive medications. The patients in both trials were administered an immediate release formulation of RTN-001 once daily in various dosages (5 mg, 10 mg or 20 mg) or placebo. Both trials evaluated office-seated SBP and DBP at prespecified timepoints, including early post-dose and trough assessments.

Placebo-adjusted reductions in SBP and DBP were observed across all evaluated dosages of RTN-001, with maximal effect observed in the first 6 hours, and clinically significant effect sustained through 16 hours. RTN-001 was well tolerated in both trials, with no treatment-related SAEs reported. Adverse events observed were consistent with the understood safety profile of the PDE-5 inhibitor class and were generally mild and transient.

Phase 2 Pilot Trial 07-05

Trial 07-05 was a two-part, randomized, double-blind, placebo-controlled crossover Phase 2 pilot trial conducted at a single clinical site in the United Kingdom in adults with SBP greater than or equal to 140 mmHg to lower than or equal to 200 mmHg and/or DBP greater than or equal to 90 mmHg to less than or equal to 120 mmHg (Figure 11). Patients were permitted to continue up to four concomitant antihypertensive medications.

•        Part 1 (Single Dose):    Patients received single oral doses of 5 mg or 20 mg RTN-001 under fed/post-breakfast state. Blood pressure was assessed at baseline and at 1 and 2 hours post-dose with the primary objective of determining a dose of RTN-001 to be used for Part 2.

•        Part 2 (Repeat Dose):    Patients received once-daily 10 mg RTN-001 or placebo under fed/post-breakfast state for 12 days. Office-based peripheral and central blood pressure was measured at trough (pre-dose) and post-dose on Days 0, 12, and 24, with the primary endpoint being blood pressure at trough.

Baseline Patient Demographics and Characteristics

Trial 07-05 enrolled a predominantly male (78.3%) and entirely white (100%) population with a mean age of approximately 63 years. The participants had a mean height of 173.4 cm and a mean weight of 83.6 kg, with a mean Body Mass Index (“BMI”) of 27.8 kg/m². At screening for Part 1 of Trial 07-05, mean office-seated peripheral SBP and DBP were 160.4 mmHg and 89.3 mmHg, respectively. At screening for Part 2 of Trial 07-05, mean office-seated peripheral SBP and DBP were 163.7 mmHg and 89.4 mmHg, respectively. Patients were permitted to continue up to four concomitant antihypertensive medications.

Efficacy

In Part 1 of Trial 07-05, a dosage of 10 mg of RTN-001 was selected to be used in Part 2 of Trial 07-05. In Part 2 of Trial 07-05, after treatment with RTN-001 at 10 mg, a placebo-corrected reduction in SBP of –7.56 mmHg and a placebo-corrected reduction in DBP of –4.56 mmHg was observed at one hour post-dose. Placebo-corrected endpoints measured pre-dose (at trough) on Days 12 and 24 also showed reductions in SBP of −5.92 mmHg and DBP −5.25 mmHg, compared with baseline (Figure 12).

Administration of a once-daily 10 mg dose of RTN-001 demonstrated clinically meaningful blood pressure reduction from one-hour post-dose through the trough measurement compared to placebo. RTN-001 observed a placebo-adjusted reduction of –7.56 mmHg SBP and –4.56 mmHg DBP at the one-hour peak. Most notably, reduction of blood pressure remained sustained at trough with a placebo-adjusted decrease of –5.92 mmHg SBP and –5.25 mmHg DBP.

Central aortic blood pressure, measured via pulse wave analysis, demonstrated sustained and clinically meaningful reductions at both peak and trough measurements compared to placebo. Administration of 10 mg RTN-001 was observed to produce a placebo-adjusted reduction in central SBP of –7.64 mmHg at 1 hour (Day 1) and –10 mmHg at 24 hours (Day 12). Central DBP reductions of –3.83 mmHg at 1 hour and –7.33 mmHg at 24 hours were observed. Mean arterial pressure (MAP), a summary measure integrating both systolic and diastolic effects and predictive of cardiorenal outcomes, demonstrated placebo-adjusted reductions of –5.11 mmHg at 1 hour and –7.56 mmHg at 24 hours on Day 12 (Figure 13).

The results of Trial 07-05 may not be predictive of the outcome of our Phase 2b dose-ranging trial or our planned Phase 3 clinical trial of RTN-001, due to both the larger patient populations of those clinical trials and the differences in clinical trial design that may be required. As a result, we cannot anticipate how RTN-001 will perform in ongoing and future clinical trials.

Safety

No SAEs were reported in Trial 07-05 (Figure 14). In Trial 07-05, four patients discontinued administration of RTN-001 due to mild-moderate AEs (one patient from dyspepsia in the placebo group; one patient from headache and dyspepsia at 5 mg RTN-001; one patient from itchy face and eyes at 10 mg RTN-001; and one patient from headache at 20 mg RTN-001).

Figure 14. Safety and Tolerability Results from Trial 07-05

Phase 2 Pilot Trial 07-08

Trial 07-08 was a randomized, double-blind, crossover Phase 2 pilot trial in Germany that evaluated once-daily RTN-001 at 5 mg or 10 mg dosages in adults with hypertension. The 28-day trial included patients that continued to take up to three concomitant antihypertensive medications and also compared the blood pressure reduction effects of RTN-001 in fasted compared to semi-fasted state. The primary objective was to evaluate the effect of RTN-001 on supine peripheral SBP and DBP at prespecified timepoints through 24 hours post-dose on Days 1 and 14 (Figure 15).

A total of 40 patients were exposed to study treatment. Baseline mean supine SBP and DBP were 143.6 mmHg and 83.3 mmHg, respectively, in the 5 mg cohort and 136.1 and 79.6 mmHg, respectively, in the 10 mg cohort. Blood pressure assessments included supine and standing SBP, DBP and ABPM.

Baseline Patient Demographics and Characteristics

Trial 07-08 enrolled a diverse hypertensive population with a mean age ranging from 57.5 years in patients that were administered 5 mg of RTN-001 to 60.0 years in patients that were administered 10 mg of RTN-001, consisting of 65% and 55% males, respectively. The trial participants had mean BMIs of 28.1 kg/m² and 28.4 kg/m² for the patients that were administered 5 mg and 10 mg of RTN-001, respectively. Baseline blood pressure was consistent between the two groups, with mean supine SBP and DBP values of approximately 143.6 mmHg and 83.3 mmHg, respectively for the 5 mg group and 136.1 mmHg and 79.6 mmHg, respectively, for the 10 mg group. Patients were permitted to continue up to three concomitant antihypertensive medications.

Efficacy

After treatment with RTN-001, reductions in SBP and DBP were observed to be most pronounced during the first 12 hours after dosing, coinciding with peak plasma concentrations (Figure 16).

Trial 07-08 was not powered for statistical significance. Peak placebo-corrected reductions were observed in supine SBP for RTN-001 at 5 mg (–12.8 mmHg, p<0.0001) and 10 mg (–9.9 mmHg, p=0.0005) and in DBP for RTN-001 at 5 mg (–5.6 mmHg, p=0.0001) and at 10 mg (–6.6 mmHg, p<0.0001) at peak effect. Mean 6-hour post-dose placebo-corrected SBP reductions were observed on Day 1 for RTN-001 at 5 mg (–9.9 mmHg, p<0.0001) and 10 mg (–7.3 mmHg, p=0.0013), with corresponding DBP reductions of –4.1 mmHg (p=0.0002) and –3.8 mmHg (p=0.0008), respectively. Mean 12-hour post-dose placebo-corrected SBP reductions were observed on Day 1 for RTN-001 at 5 mg (–9.1 mmHg, p<0.0001) and 10 mg (–7.0 mmHg, p=0.0007), with corresponding DBP reductions of –3.8 mmHg (p=0.0002) and –3.8 mmHg (p=0.0004), respectively. Effects at 16–24 hours were attenuated, consistent with declining drug exposure at later timepoints. After treatment with RTN-001, reductions in additional blood pressure measures were also observed, including ABPM and standing office blood pressure. These findings were directionally consistent with the peripheral supine results. The results of Trial 07-08 may not be predictive of the outcome of our Phase 2b

dose-ranging trial or our planned Phase 3 clinical trial of RTN-001, due to both the larger patient populations of those clinical trials and the differences in clinical trial design that may be required. As a result, we cannot anticipate how RTN-001 will perform in ongoing and future clinical trials.

In an exploratory analysis in Trial 07-08, it was observed that, on average, patients with higher baseline blood pressure experienced a greater magnitude of blood pressure reduction than those with a lower baseline blood pressure at similar plasma concentrations of RTN-001. We believe patients with a higher baseline blood pressure may be responsive to RTN-001.

Moreover, patients in the RTN-001 5 mg cohort had a mean baseline supine SBP of 143.6 mmHg, which was approximately 7.5 mmHg higher compared to the RTN-001 10 mg cohort at 136.1 mmHg (Figure 18).

We believe this difference in baseline blood pressure may be related to the lower reduction in SBP observed in the RTN-001 10 mg cohort as compared to the RTN-001 5 mg cohort. Patients with low baseline that were evaluated in this exploratory analysis in Trial 07-08 would not meet the inclusion criteria for our Phase 2b clinical trial. The results

of exploratory analysis in Trial 07-08 may not be predictive of the outcome of our Phase 2b dose-ranging trial or our planned Phase 3 clinical trial of RTN-001, due to both the larger patient populations of those clinical trials and the differences in clinical trial design that may be required. As a result, we cannot anticipate how RTN-001 will perform in ongoing and future clinical trials.

Pharmacokinetics and Exposure/Response

RTN-001 was rapidly absorbed, with peak plasma concentrations occurring between 1.2–1.6 hours. Plasma concentrations of RTN-001 increased proportionally when comparing the RTN-001 5 mg and 10 mg dosages. By 16 hours, RTN-001 plasma concentrations declined substantially and were low or undetectable at 24 hours. Observed blood pressure reductions correlated with periods of higher RTN-001 plasma concentration.

In an exploratory analysis of plasma concentration and blood pressure reduction, the immediate release formulation of RTN-001 was observed to maintain plasma concentrations above 1–2 ng/mL for approximately 4-6 hours at 5 mg and 6-8 hours at 10 mg after dosing. Mean supine SBP reductions were observed to increase with RTN-001 plasma concentration up to approximately 1–2 ng/mL and to plateau at higher concentrations, with concentrations above 2 ng/mL observed to result in limited additional blood pressure reduction (Figure 20).

Safety

RTN-001 was generally well tolerated and no SAEs were reported (Figure 21). Two discontinuations occurred due to treatment-emergent adverse events (“TEAEs”) (one patient from stress, one patient from headache) in patients receiving 10 mg of RTN-001. TEAEs were mostly mild to moderate in intensity, with headache being the most frequently reported event (25% in each active-treatment group compared to 7.7% for placebo).

Figure 21. Safety and Tolerability Results from Trial 07-08

Prior Clinical Data

RTN-001 has been evaluated in a clinical development program consisting of a total of nine trials conducted between 2005 and 2009 by Surface Logix, including the two Phase 2 pilot trials for the treatment of hypertension discussed above. Other than Trial 09-09, all trials evaluated the immediate release formulation of RTN-001. In the nine trials, a total of 265 subjects were enrolled, of whom 243 received RTN-001 for up to 14 days across single- and multiple-dose cohorts.

Apart from the two Phase 2 pilot trials for the treatment of hypertension discussed above, the seven additional clinical trials consisted of four Phase 1 trials conducted in healthy volunteers and one Phase 1 trial and two Phase 2 trials in patients experiencing various cardiovascular or vasoregulatory conditions evaluating RTN-001 for the treatment of erectile dysfunction, endothelial dysfunction and Raynaud’s disease, which provided further pharmacodynamic data on vascular responsiveness, informed dose selection and supported advancement into later-stage clinical development.

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1        Internal analysis of unpublished studies.

Across the clinical trials, the immediate release formulation of RTN-001 was observed to have a consistent pharmacokinetic profile, evidence of vascular pharmacodynamic activity, and was generally well tolerated. There have been no observed drug-related SAEs reported with RTN-001. The most commonly reported adverse events in the seven additional trials included headache, chromatopsia, dizziness, visual disturbance, blurred vision, and photophobia, consistent with the PDE-5 inhibitor class and mechanism of action consistent with the safety and tolerability results observed in the two completed Phase 2 pilot trials for the treatment of hypertension. The frequency of adverse events was observed to be highest early in the dosing period and to decline with continued dosing (Figure 22).

These seven additional trials identified above were not powered for clinical significance. The trial for erectile dysfunction was a double-blind cross over randomized controlled trial with 40 male patients with history of erectile dysfunction. This trial was an adaptive design trial to determine the maximum tolerated and lowest effective dose of a single dose of immediate release RTN-001. The primary endpoint, beyond safety, tolerability, and pharmacokinetics, was a difference in mean time penile rigidity (greater than or equal to 60%) compared to placebo as assessed by RigiScan® plethysmography monitoring. There was a statistical difference in this parameter in patients receiving 10 and 40 mg, respectively, at 30 minutes to 4 hours post dose and by subjects receiving 10, 20, 40 and 60 mg at 23.5 hours to 25 hours post dose.

With respect to endothelial function, this clinical trial was performed in a single center and was a double blind randomized controlled trial of single and multiple doses of RTN-001 and was focused on safety, pharmacokinetics and was a non-statistically powered evaluation of a qualitative, non-invasive measure of endothelial function (assessment of fingertip hyperemia using peripheral arterial tonometry (“RH-PAT”)) as a pharmacodynamic marker. A total of 48 subjects were enrolled, and 41 patients completed the trial. There were no safety concerns throughout the trial and improvement in the RH-PAT index was observed in the seven-day repeat dose subjects taking 5 mg (compared to placebo) at day 7.

In a small, single center, non-statistically powered double-blind placebo controlled randomized trial in 17 subjects with secondary Raynaud’s Disease, subjects were treated with 10 mg of RTN-001 for 14 days. The primary endpoint was severity of secondary Raynaud’s disease-related attacks during the 14-day RTN-001 dosing period. Compared to baseline, there was no clinically relevant difference between the two treatment groups with high degrees of variability in self-scoring.

Development of a Modified Release Formulation

RTN-001 has been evaluated to date using an immediate release formulation across doses ranging from 5 mg to 80 mg. The compound is rapidly absorbed and exhibits a linear elimination rate.

Evaluation of individual patient-level pharmacokinetic and pharmacodynamic data identified three limitations of the immediate release formulation of RTN-001:

•        Decreased plasma concentrations over 24 hours corresponded with reduced efficacy at trough;

•        Cmax corresponded to the incidence of transient non-serious tolerability events, including headache, flushing, and visual disturbances without providing meaningful additional blood pressure reduction; and

•        Substantial inter-subject variability in systemic exposure was observed.

Plasma concentrations of RTN-001 and RTN-146, its active metabolite, were evaluated when optimizing the modified release formulation of RTN-001 for tolerability.

Concentration of parent compound RTN-001 and metabolite RTN-146 in plasma after oral administration to Sprague-Dawley rats.

In vitro enzymatic assays performed by Surface Logix, consisting of IMAP and scintilallion technologies, yielded observed IC50 values of 0.15 nM and 0.26 nM for RTN-001 and RTN-146, respectively. These studies indicate the inhibition of PDE-5 by both molecules with observed values comparable to the first-generation PDE-5 inhibitor, vardenafil, and greater potency observed than sildenafil and tadalafil in head-to-head assays. In another set of head-to-head enzymatic assays performed by Surface Logix, RTN-001 and RTN-146 were observed to exhibit selectivity profiles across other phosphodiesterase isoforms comparable to that of first-generation PDE-5 inhibitors. Both RTN-001 and RTN-146 demonstrated favorable safety and tolerability profiles.

Two modified release dose strengths (10 mg and 20 mg) of RTN-001 were evaluated in Trial 09-09 and compared with a 15 mg immediate release formulation of RTN-001 (Figure 25). The trial demonstrated that treatment with the modified release formulation resulted in (i) sustained exposure across the 24-hour dosing interval (ii) reductions in Cmax and (iii) improvements in patient-to-patient variability in Cmax. The central graph in Figure 25 shows the plasma concentration of RTN-001 following administration of an immediate release formulation or a modified release formulation.

The pharmacokinetic profile of the modified release formulation of RTN-001 was observed to have a number of advantages over the pharmacokinetic profile of the immediate release formulation of RTN-001. The first was the ability of the modified release formulation to maintain higher concentrations of RTN-001 at 24 hours. The 10 mg and 20 mg doses of the modified release formulation were observed to have mean RTN-001 plasma concentrations of 1.06 ng/mL and 1.48 ng/mL, respectively, at 24 hours, compared to 0.263 ng/mL for the 15 mg dose of the immediate release formulation. We believe the results provide support that the modified release formulation of RTN-001 can provide greater observed 24-hour blood pressure reductions with a once-daily dosing.

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*        A. Pharmacokinetic parameters for RTN-001 in plasma, presented as arithmetic mean values from the pharmacokinetic properties of patients in Trial 09-09, comparing the RTN-001 20 mg modified release formulation administered in the fasted state (n=12) with the RTN-001 15 mg immediate release reference formulation administered in the fasted state (n=12). Cmax denotes peak plasma concentration, tmax denotes time to peak plasma concentration presented as median with range, C24 denotes plasma concentration at 24 hours post-dose, and MRT denotes mean residence time. Drug concentrations are presented on a logarithmic scale based on results from Trial 09-09. Data from RTN-001 15 mg immediate release formulation and RTN-001 20 mg modified release formulation were based on results from Trial 09-09. B. Individual-subject peak plasma concentrations of RTN-001 and RTN-146 combined, following administration of the immediate release formulation and the modified release formulation of RTN-001.

Secondly, the modified release formulation was observed to result in a lower combined Cmax of RTN-001 and RTN-146. The 10 mg and 20 mg doses of the modified release formulation of RTN-001 resulted in mean RTN-146 Cmax levels of 15.6 and 31.2 ng/mL, respectively, compared to 74.7 ng/mL for the 15 mg dose of the immediate release formulation of RTN-001. We believe the lower combined Cmax levels of RTN-001 and RTN-146 may be associated with a lower probability of PDE-5 inhibitor class-related adverse events (such as headache, flushing and visual disturbances).

Although RTN-001 Cmax and RTN-146 Cmax increased in parallel, RTN-146 Cmax was observed to be approximately eight times that of RTN-001 Cmax across doses and was strongly correlated with most PDE-5 inhibitor class-related adverse events. Adverse events such as visual adverse events (e.g. chromatopsia) (Figure 26) were observed to scale with dose.

An analysis of pharmacokinetic and blood pressure data from Trial 07-08 identified a plasma drug concentration of RTN-001 of 1-2 ng/mL as the threshold observed to be associated with blood pressure reduction, with concentrations above 2 ng/mL observed to result in limited additional blood pressure reduction. Based on pharmacokinetic modeling of the modified release formulation of RTN-001 at the 15 mg, 30 mg and 45 mg doses selected for the Phase 2b clinical trial, an estimated 54.5%, 90.9% and 100% of patients, respectively, are anticipated to exhibit a 24-hour timepoint concentration (“C24”) above 1 ng/mL, and 27.3%, 54.5% and 81.8% of patients, respectively, are anticipated to exhibit a C24 above 2 ng/mL. Based on the same modeling, we believe a higher dose, such as 60 mg, would result in limited additional blood pressure reduction as 100% and 86.4% of patients were modeled to achieve >1 ng/mL and >2 ng/mL, respectively. In addition, we expect that the higher dose would increase RTN-001 Cmax and RTN-146 Cmax and, correspondingly, the risk of PDE-5 inhibitor class-related adverse events, without additional blood pressure reduction. The results of the pharmacokinetic modeling of the modified release formulation of RTN-001 may not be predictive of the outcome of our Phase 2b dose-ranging trial or our planned Phase 3 clinical trial of RTN-001 due to both the larger patient populations of those clinical trials and the differences in clinical trial design that will be required. As a result, we cannot predict how RTN-001 will perform in ongoing and future clinical trials.

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*        Predicted mean steady-state plasma concentration–time profiles for RTN-001(solid lines) and its metabolite, RTN-146 (dotted lines), following once-daily (QD) oral administration of an RTN-001 modified-release (MR) tablet in the fasted state. The profiles shown are derived from pharmacokinetic modeling and represent predicted values; they do not depict observed results from any clinical trial.

We believe that the pharmacokinetic characteristics of the modified release formulation of RTN-001 may provide more sustained blood pressure control across the 24-hour dosing interval, improved tolerability, and more predictable and consistent patient response, in each case, relative to the immediate release formulation of RTN-001. Our ongoing Phase 2b clinical trial uses the modified release formulation of RTN-001 for the treatment of patients with uHTN.

Phase 2b Dose-Ranging Trial in Hypertension

In October 2025, following acceptance of our investigational new drug application (“IND”) by the FDA, we initiated a randomized, multicenter, double-blind, placebo-controlled Phase 2b dose-ranging trial in approximately 31 clinical sites in the United States, as of the date of this prospectus, to evaluate RTN-001 in approximately 280 adults with uHTN receiving two to five concomitant antihypertensive medications (Figure 28). As of September 11, 2026, approximately 40% of subjects were enrolled in our Phase 2b clinical trial. The trial includes four cohorts of 70 patients receiving either placebo or one of three doses of the modified release formulation of RTN-001 (15 mg, 30 mg or 45 mg) once-daily under fasting conditions for 12 weeks. Dose selection was informed by pharmacokinetic/pharmacodynamic relationships and tolerability data generated across prior clinical trials.

The primary endpoint is the change from baseline in peripheral office-seated SBP at week 4 compared to placebo. Key secondary endpoints of the trial include (1) mean change from baseline ABPM over 24 hours and (2) mean change in central blood pressure compared to placebo. Additionally, the trial includes pharmacokinetics and safety assessments to characterize drug exposure, support dose selection and evaluate the overall safety and tolerability profile of RTN-001. The trial evaluates RTN-001 doses 15 mg, 30 mg and 45 mg to determine the appropriate dose of RTN-001 for our planned Phase 3 clinical trial. Initial data is expected in the first half of 2027.

Assuming a standard deviation of 11 mmHg and a 10% dropout rate, the trial is designed to detect a 7 mmHg between-group difference in SBP. The results of this trial are expected to guide dose selection and design considerations for our planned Phase 3 trial.

Next Steps

Following completion of our ongoing Phase 2b clinical trial for the treatment of patients with uHTN, we intend to request an End-of-Phase 2 meeting with the FDA and, if supported by the data, we plan to initiate a Phase 3 trial designed to further evaluate the efficacy of RTN-001 for the treatment of uHTN and rHTN and establish long-term safety of RTN-001 for chronic use to support an NDA filing.

We intend to explore RTN-001 in patient populations with unmet medical need and where dysregulation of nitric oxide-cGMP signaling contributes to disease pathophysiology focusing on areas where first generation PDE-5 inhibitors have been studied but their effect was limited due to inadequate bioavailability and/or cellular penetration. These indications include but are not limited to: combined pre- post- capillary pulmonary hypertension (“CpcPH”) due to heart failure, non-obstructive hypertrophic cardiomyopathy (“NOHCM”) and heart failure with preserved ejection (“HFpEF”).

Manufacturing

We do not own or operate manufacturing facilities for the production of RTN-001, nor do we have plans to develop our own manufacturing operations in the foreseeable future. We currently depend on third-party contract manufacturers for our required raw materials, active pharmaceutical ingredients, and finished product candidates for our clinical trials, with some of those suppliers located in the United States and others located outside the United States. See “Risk Factors — Risks Related to Our Reliance on Third Parties — We currently rely on third parties for the manufacture of RTN-001 for clinical development and expect to continue to rely on third parties for the foreseeable future. This reliance on third parties increases the risk that we will not have sufficient quantities of RTN-001 or such quantities at an acceptable cost, which could delay, prevent or impair our development or potential commercialization efforts.”

Competition

The biopharmaceutical industry is highly dynamic, characterized by rapid technological advancements, evolving understandings of disease mechanisms, and a strong emphasis on intellectual property. We anticipate facing competition from a broad range of entities, including large pharmaceutical and specialty pharmaceutical companies, other biotechnology companies, and public and private research organizations. Many of these competitors have substantial financial resources, extensive expertise in research and development, and well-established manufacturing and marketing capabilities.

If RTN-001 is developed successfully and approved for commercial use, we expect to compete primarily with existing therapies targeting uHTN and rHTN against existing therapies and emerging approaches. For further discussion of the risks we face relating to competition, see the section titled “Risk Factors — Risks Related to Commercialization of RTN-001 and any Future Product Candidates — We will face significant competition, and if our competitors develop and commercialize technologies or product candidates more rapidly than we do, or their technologies or product candidates are more effective, safer or less expensive than RTN-001 or any future product candidates we develop, our business and our ability to develop and successfully commercialize products will be adversely affected.”

Intellectual Property

Protection of our intellectual property is fundamental to the long-term success of our business. We believe that our continued success depends in large part on our product candidates, the skills of our employees and their ability to continue to innovate and advance our product candidates. We rely primarily on a combination of patent, license agreements, trade secret laws and know-how, as well as contractual provisions with employees and third parties, to establish and protect our intellectual property rights. We also provide products and information to our vendors and collaborators pursuant to agreements with non-disclosure terms and other conditions that impose restrictions on use and disclosure. We further make use of contractual obligations that require our employees, consultants and contractors with access to our proprietary information to execute nondisclosure and assignment of intellectual property agreements to preserve our intellectual property rights. We generally control access to our proprietary and confidential information through the use of internal and external controls that are subject to periodic review.

The proprietary nature of, and protection for, RTN-001 are important parts of our strategy to develop and commercialize RTN-001 as an alternative treatment to address the unmet medical need in hypertension and other cardiovascular or renal indications.

As of the date of this prospectus, we license one issued U.S. patent under the Historical Agreements and own one issued U.S. patent, one pending U.S. patent application and two pending international patent applications related to RTN-001. Under the Historical Agreements, we currently license a U.S. composition of matter patent covering RTN-001 that nominally expires in 2027. We may not be able to obtain patent term extensions on this patent if we are not able to file an application for marketing approval of RTN-001 until after its nominal expiration date. In March 2025, we were granted a patent to the preferred crystalline polymorph form of RTN-001, which has a nominal expiration date in 2044. In addition, we filed a continuation-in-part application directed to this preferred crystalline polymorph form with additional data. We also provisionally filed a combination therapy patent for RTN-001, which is pending and which would have a nominal expiration date in 2044, if granted. We currently have Patent Cooperation Treaty (“PCT”) filings initiated to establish patent-pending status across a number of jurisdictions outside the United States, including the European Union, Japan and China. Our patents will expire between 2027 and 2044, assuming no patent term extensions or adjustments. In addition, the Company has filed and intends to file additional patent applications worldwide to cover unique formulations and combination products that improve the pharmacokinetics and pharmacodynamics of RTN-001 for the treatment of hypertension as well as other potential indications, and methods of treatment for certain indications.

Our patent strategy includes using the filed patent applications to continue to obtain patented subject matter relevant to current and future product candidates and related technologies, supplemented by additional patent filings covering conceptual methods, specific aspects of current and proposed products, including unique formulations and combination products that improve the pharmacokinetics or pharmacodynamics of RTN-001 for the treatment of hypertension as well as other potential indications, and methods of treatment for certain indications. We also engage in strategic analysis of our patent assets and pursue additional patent claims from our existing portfolio that may provide us with market advantages and assess for opportunities to file additional patent applications on new innovations.

We intend to protect our brands through registration of trademark rights. As of the date of this prospectus, the Company does not own any registered trademarks. We continue to rely, in part, on trade secrets and know-how to protect certain proprietary technology underlying RTN-001 for which we are not pursuing patent protection and other technological innovations to develop and maintain our competitive position. We protect our proprietary rights through a variety of methods, including confidentiality and assignment agreements with employees, consultants, suppliers, collaborators and others who may have access to our proprietary information. See “Risk Factors — Risks Related to Intellectual Property” for more information regarding the risks relating to intellectual property.

Background of RTN-001 Related Licensing Rights

RTN-001 was originally discovered and developed by Surface Logix. In April 2011, Eric Keller, our CEO, led Surface Logix’s acquisition by Nano Terra, where he served in the role of CEO, the establishment of NT Life, a joint venture between a subsidiary of Nano Terra and Kadmon, and the licensing of RTN-001 and other compounds to Kadmon through a sublicense agreement with NT Life. In 2019, Kadmon entered into an exclusive sublicense agreement for RTN-001 and other compounds with Redux, a therapeutic asset acquisition and development company. Mr. Keller and Dr. Sweetnam, our CEO and CSO, respectively, are each a manager of Redux. In 2021, Kadmon’s parent entity was acquired by Sanofi, and Kadmon became a wholly owned subsidiary of Sanofi. In 2023, Retension IP, a wholly-owned subsidiary of the Company and formerly a subsidiary of Redux, entered into a sublicense agreement with Redux, pursuant to which we were granted an exclusive, worldwide, royalty-bearing right and license to develop, manufacture and commercialize RTN-001. We also retain ownership of all clinical data arising from the nine completed clinical trials conducted by Surface Logix, including the two Phase 2 pilot trials for the treatment of hypertension.

Key Agreements

As discussed above, we have obtained the rights related to the development and commercialization of RTN-001 pursuant to a series of key licenses and sublicenses as described below. While our rights to the development of RTN-001 are derived primarily from the Redux Agreement, a summary of the material terms of the key agreements related to these rights are described in further detail below.

Surface Logix Agreement

In April 2011, pursuant to the License Agreement between NT Life and Surface Logix (the “Surface Logix Agreement”), Surface Logix granted NT Life an exclusive, worldwide, sublicensable license under certain intellectual property rights to develop, manufacture, and commercialize certain product candidates of Surface Logix, including RTN-001 (formerly known as SLx-2101). Surface Logix also granted to NT Life a non-exclusive, worldwide, sublicensable license under Surface Logix’s platform technology to develop, manufacture, and commercialize certain products (including RTN-001). Surface Logix retained ownership of all licensed intellectual property and core platform technology, while NT Life owns any new intellectual property developed by NT Life, except for improvements made to Surface Logix’s platform which are owned by Surface Logix.

NT Life may terminate the Surface Logix Agreement, in whole or in part, with six months’ notice, though Surface Logix may accelerate the effective date termination on 30 days’ notice. Either party may terminate the agreement for a material breach if not cured within 60 days or in the case of the other party’s voluntary or involuntary insolvency, if not dismissed or released within 120 days. Surface Logix may terminate with immediate effect upon written notice if NT Life challenges Surface Logix’s patents, and the Surface Logix Agreement automatically terminates if NT Life is dissolved. The Surface Logix Agreement provides that NT Life’s failure to meet required clinical development milestones, which have been achieved, or to use ongoing commercially reasonable efforts to develop a program may, on a product-by-product basis, trigger a reversion of product rights, automatically terminating the license to NT Life for the affected products. Upon termination of the Surface Logix Agreement, (i) all applicable licenses to NT Life would terminate, and (ii) any and all sublicenses granted by NT Life would remain in effect according to their terms with Surface Logix deemed the licensor thereunder.

NT Life Agreement

In April 2011, NT Life and Kadmon entered into a Sub-License Agreement (the “NT Life Agreement”), pursuant to which NT Life granted Kadmon an exclusive, worldwide, sublicensable sublicense to develop, manufacture and commercialize products, including RTN-001 (formerly known as SLx-2101). NT Life also granted to Kadmon a non-exclusive, worldwide, sublicensable license under Surface Logix’s platform technology to develop, manufacture, and commercialize certain products (including RTN-001). Kadmon may terminate the NT Life Agreement, in whole or in part, with six months’ notice, though NT Life may accelerate the effective date termination on 30 days’ notice. Either party may terminate the agreement for a material breach if not cured within 60 days or in the case of the other party’s voluntary or involuntary insolvency, if not dismissed or released within 120 days. NT Life may terminate with immediate effect upon written notice if Kadmon challenges any licensed patents, and the NT Life Agreement automatically terminates if Kadmon is dissolved. The NT Life Agreement provides that Kadmon’s failure to meet required clinical development milestones, which have been achieved, or to use ongoing commercially reasonable efforts to develop a program may, on a product-by-product basis, trigger a reversion of product rights, automatically

terminating the license to Kadmon for the affected products. Upon termination of the NT Life Agreement, (i) all applicable licenses to Kadmon would terminate, and (ii) any and all sublicenses granted by Kadmon would remain in effect according to their terms with NT Life deemed the licensor thereunder.

Kadmon Agreement

On February 2019, Kadmon and Redux entered into an Exclusive Sub-License Agreement, as amended (the “Kadmon Agreement” and, together with the Surface Logix Agreement and NT Life Agreement (the “Historical Agreements”)). Pursuant to the Kadmon Agreement, Kadmon granted to Redux an exclusive, worldwide, sublicensable sublicense to develop, manufacture and commercialize two product candidates, RTN-001 (formerly known as SLx-2101 and KD-027) and KD-026, with Kadmon retaining responsibility for royalty and sublicense revenue payments under a merger agreement dated April 2011 pursuant to which Surface Logix merged with Nano Terra.

Redux is obligated to pay a low-teen percentage royalty of net sales and sublicense revenue to Kadmon for licensed products. Redux also granted to Kadmon a right of first negotiation, pursuant to which, prior to Redux, its affiliates or any sublicensee granting or assigning a right to a third party to commercialize a licensed product in a country in the territory, Redux must offer Kadmon the first right to negotiate such a deal. If Kadmon does not exercise its right of first negotiation or the parties are unable to agree to terms of such a deal, Redux, its affiliates or its sublicensee is free to negotiate and enter into such an agreement with a third party.

Pursuant to the Kadmon Agreement, Redux was obligated to meet certain diligence milestones, itself or through affiliates or sublicensees, to initiate a Phase 2 or Phase 3 clinical trial with respect to at least one of the two product candidates licensed under the Kadmon Agreement within 24 months of the effective date of the Kadmon Agreement. Redux had the option to extend this diligence period by an additional 12 months per extension, for a total of two extensions. For each extension of the diligence period, Redux was obligated to pay to Kadmon a non-refundable, one-time, lump sum payment of $150,000. The parties to the Kadmon Agreement extended the diligence period through two subsequent amendments dated February 13, 2019 and June 27, 2022, respectively. See discussion under “Redux Agreement” below regarding payment of extension fees.

Kadmon may terminate the Kadmon Agreement for Redux’s failure to meet diligence milestones or challenges to licensed patents by Redux or a third party that Redux materially assists. Redux may terminate the Kadmon Agreement voluntarily with 60 days’ notice. The Kadmon Agreement is automatically terminated upon the dissolution of Redux. Either party may terminate the Kadmon Agreement for the other party’s material breach if not cured within 45 days of notice or for the other party’s voluntary or involuntary insolvency, if not dismissed or released within 120 days. Upon termination of the Kadmon Agreement, (i) all applicable licenses to Redux would terminate, and (ii) any and all sublicenses granted by Redux would remain in effect according to their terms with Kadmon deemed the licensor thereunder.

Redux Agreement

On November 17, 2023, our subsidiary, Retension IP entered into a Sublicense Agreement (the “Redux Agreement”) with Redux, pursuant to which Redux granted to Retension IP an exclusive, worldwide, sublicensable license to Redux’s intellectual property rights under the Kadmon Agreement to develop, manufacture and commercialize licensed products, including RTN-001 (formerly known as KD-027). The right to develop, manufacture and commercialize the other product candidate licensed under the Kadmon Agreement (formerly known as KD-026) was granted to Response, an affiliate of the Company. In connection with the Redux Agreement, Redux assigned to Retension IP the patent portfolio owned by Redux that covered RTN-001 and related compounds, including two U.S. patent applications related to RTN-001 formulations and methods of treatment.

The Redux Agreement incorporates by reference the terms and conditions of the Kadmon Agreement, including the diligence milestones and royalty obligations thereunder. As contemplated under the terms of the Redux Agreement, in December 2021, Redux paid to Kadmon the $150,000 extension fee, which was later reimbursed to Redux by Response, an affiliate of the Company, to extend the second extended diligence period. The diligence milestones under the Kadmon Agreement were satisfied by the Company’s initiation of its Phase 2b clinical trial for RTN-001. For a discussion of our relationships with affiliated entities, see “Management” and “Certain Relationships and Related Party Transactions — Sublicense Agreements.”

Under the Redux Agreement, Retension IP assumed the royalty obligations owed by Redux to Kadmon, consisting of a low-teens percentage of royalties on net sales of RTN-001 and a low-teens percentage of royalties on sublicensing revenue, subject to customary deductions, to be paid each quarter in which net sales are generated or sublicense revenue is received.

•        Phase 3:    The product candidate is administered to an expanded patient population to further evaluate dosage, to provide substantial evidence of efficacy and to further test for safety, generally at multiple geographically dispersed clinical trial sites. These clinical trials are intended to establish the overall risk-benefit ratio of the product candidate and provide an adequate basis for product labeling.

Post-approval trials, sometimes referred to as Phase 4 studies, may be conducted after initial marketing approval. These trials are used to gain additional experience from the treatment of patients in the intended therapeutic indication. In certain instances, the FDA may mandate the performance of Phase 4 clinical trials as a condition of approval of an NDA.

During the development of a new drug, sponsors are given opportunities to meet with the FDA at certain points. These points may be prior to submission of an IND, at the end of Phase 2, and before an NDA is submitted. Meetings at other times may be requested. These meetings can provide an opportunity for the sponsor to share information about the data gathered to date, for the FDA to provide advice, and for the sponsor and the FDA to reach agreement on the next phase of development.

Concurrent with clinical trials, companies usually complete additional animal studies and must also develop additional information about the chemistry and physical characteristics of the drug and finalize a process for manufacturing the product in commercial quantities in accordance with cGMPs. The manufacturing process must be capable of consistently producing quality batches of the product candidate and, among other things, the manufacturer must develop methods for testing the identity, strength, quality and purity of the final drug. In addition, appropriate packaging must be selected and tested, and stability studies must be conducted to demonstrate that the product candidate does not undergo unacceptable deterioration over its shelf life.

U.S. Review and Approval Process

The results of product development, preclinical and other nonclinical studies and clinical trials, along with descriptions of the manufacturing process, analytical tests conducted on the chemistry of the drug, proposed labeling and other relevant information are submitted to the FDA as part of an NDA requesting approval to market the product. The submission of an NDA is subject to the payment of substantial user fees; a waiver of such fees may be obtained under certain limited circumstances.

The FDA conducts a preliminary review of all NDAs within the first 60 days after submission, before accepting them for filing, to determine whether they are sufficiently complete to permit substantive review. The FDA may request additional information rather than accept an NDA for filing. In this event, the NDA must be resubmitted with the additional information. The resubmitted application also is subject to review before the FDA accepts it for filing. Once accepted for filing, the FDA reviews an NDA to determine, among other things, whether a product is safe and effective for its intended use and whether its manufacturing is cGMP-compliant to assure and preserve the product’s identity, strength, quality and purity. Under the Prescription Drug User Fee Act (“PDUFA”), guidelines that are currently in effect, the FDA has a goal of 10 months from the date of “filing” of a standard NDA for a new molecular entity to review and act on the submission. This review typically takes 12 months from the date the NDA is submitted to FDA because the FDA has approximately two months to make a “filing” decision after it the application is submitted.

The FDA may refer an application for a novel drug to an advisory committee. An advisory committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates and provides a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions. Before approving an NDA, the FDA will typically conduct a pre-approval inspection of the facility or facilities where the product is manufactured. Additionally, before approving an NDA, the FDA may inspect one or more clinical trial sites to assure compliance with GCPs.

After the FDA evaluates an NDA and conducts inspections of manufacturing facilities where the investigational product and/or its drug substance will be produced, the FDA may issue an approval letter or a Complete Response Letter (“CRL”). An approval letter authorizes commercial marketing of the drug with prescribing information for specific indications contained in the labeling approved by the FDA as part of the NDA approval process. A CRL indicates that the review cycle of the application is complete, and the application will not be approved in its present form. A CRL usually describes the specific deficiencies in the NDA identified by the FDA and may require additional

clinical data, such as an additional clinical trial or other significant and time-consuming requirements related to clinical trials, nonclinical studies or manufacturing. If a CRL is issued, the sponsor must resubmit the NDA to address all of the deficiencies identified in the letter or withdraw the application. Even if such data and information are submitted, the FDA may decide that the NDA does not satisfy the criteria for approval.

If a product receives regulatory approval, the approval may be significantly limited to specific diseases and dosages or the indications for use may otherwise be limited, which could restrict the commercial value of the product. In addition, the FDA may require a sponsor to conduct Phase 4 testing, which involves clinical trials designed to further assess a drug’s safety and effectiveness after NDA approval, and may require testing and surveillance programs to monitor the safety of approved products that have been commercialized. The FDA may also place other conditions on approval including the requirement for a risk evaluation and mitigation strategy (“REMS”), to assure the safe use of the drug. If the FDA concludes a REMS is needed, the sponsor of the NDA must submit a proposed REMS. The FDA will not approve the NDA without an approved REMS, if required. A REMS could include medication guides, physician communication plans or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. Any of these limitations on approval or marketing could restrict the commercial promotion, distribution, prescription or dispensing of products.

In addition, the Pediatric Research Equity Act (“PREA”), requires a sponsor to conduct pediatric clinical trials for most drugs, for a new active ingredient, new indication, new dosage form, new dosing regimen or new route of administration. Under PREA, original NDAs and supplements must contain a pediatric assessment unless the sponsor has received a deferral or waiver. The required trial must evaluate the safety and effectiveness of the product for the claimed indications in all relevant pediatric subpopulations and support dosing and administration for each pediatric subpopulation for which the product is safe and effective. Certain conditions qualify for a waiver because they rarely or never occur in pediatrics. The sponsor or FDA may request a deferral of pediatric clinical trials for some or all of the pediatric subpopulations. A deferral may be granted for several reasons, including a finding that the drug is ready for approval for use in adults before pediatric clinical trials are complete or that additional safety or effectiveness data needs to be collected before the pediatric clinical trials begin. The FDA must send a non-compliance letter to any sponsor that fails to submit the required assessment, keep a deferral current or fails to submit a request for approval of a pediatric formulation.

Expedited Development and Review Programs

The FDA has a number of programs intended to expedite the development or review of a marketing application for a new drug. For example, the fast track designation program is intended to expedite or facilitate the process of developing and reviewing product candidates that meet certain criteria. Specifically, investigational drugs are eligible for fast track designation if they are intended to treat a serious or life-threatening disease or condition and demonstrate the potential to address unmet medical needs for the disease or condition. The sponsor of a fast track product candidate has opportunities for more frequent interactions with the applicable FDA review team during product development and, once an NDA is submitted, the product candidate may be eligible for priority review. With regard to a fast track product candidate, the FDA may consider for review sections of the NDA on a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the sections of the NDA, the FDA agrees to accept sections of the NDA and determines that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the NDA.

A product candidate intended to treat a serious or life-threatening disease or condition may also be eligible for breakthrough therapy designation to expedite its development and review. A product candidate can receive breakthrough therapy designation if preliminary clinical evidence indicates that the product candidate, alone or in combination with one or more other drugs or biologics, may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. The designation includes all of the fast track program features, as well as more intensive FDA interaction and guidance beginning as early as Phase 1 and an organizational commitment to expedite the development and review of the product candidate, including involvement of senior managers.

Any product candidate submitted to the FDA for approval, including a product candidate with a fast track designation or breakthrough designation, may also be eligible for other types of FDA programs intended to expedite development and review, such as priority review and accelerated approval. An NDA is eligible for priority review if the product candidate is designed to treat a serious condition, and if approved, would provide a significant improvement in safety or efficacy compared to marketed products. The FDA will attempt to direct additional resources to the

•        the issuance of safety alerts, Dear Healthcare Provider letters, press releases and other communications containing warnings or other safety information about the product; or

•        injunctions or the imposition of civil or criminal penalties.

In addition, the FDA closely regulates the marketing, labeling, advertising and promotion of drug products. A company can make only those claims relating to safety and efficacy that are approved by the FDA and in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses. Failure to comply with these requirements in the promotion of a drug can result in, among other things, adverse publicity, warning letters, corrective advertising and potential civil and criminal penalties. Physicians may prescribe legally available products for uses that are not described in the product’s labeling and that differ from those tested by us and approved by the FDA. Such off-label uses are common across medical specialties and are undertaken based on the clinical judgment of the physician. Physicians may believe that such off-label uses are the best treatment for many patients in varied circumstances. The FDA does not regulate the practice of medicine or the behavior of physicians in their choice of treatments. The FDA does, however, restrict manufacturers’ communications on the subject of off-label use of their products.

Orphan Drug Designation and Regulatory Exclusivity

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug intended to treat a rare disease or condition, which is a disease or condition that affects fewer than 200,000 individuals in the United States or, if it affects more than 200,000 individuals in the United States, there is no reasonable expectation that the cost of developing and making a drug product available in the United States for this type of disease or condition will be recovered from sales of the product. Orphan designation must be requested before submitting an NDA. After the FDA grants orphan designation, the identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan designation does not convey any advantage in or shorten the duration of the regulatory review and approval process.

If a product that has orphan designation subsequently receives the first FDA approval for the disease or condition for which it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications to market the same drug for the same disease or condition for seven years, except in limited circumstances, such as a showing of clinical superiority to the product with orphan exclusivity or inability to manufacture the product in sufficient quantities. The designation of such drug also entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages and user-fee waivers. However, competitors may receive approval of different products for the indication for which the orphan product has exclusivity or obtain approval for the same product but for a different indication for which the orphan product has exclusivity. Orphan exclusivity also could block the approval of a competing product for seven years if a competitor obtains approval of the “same drug,” as defined by the FDA, or if a product candidate is determined to be contained within the competitor’s product for the same disease or condition. In addition, if an orphan-designated product receives marketing approval for an indication broader than what is designated, it may not be entitled to orphan exclusivity.

NCE, NCI, and Pediatric Regulatory Exclusivities

Regulatory exclusivity provisions under the FDCA can delay the submission or the approval of certain marketing applications. The FDCA provides a five-year period of non-patent data exclusivity within the United States to the first applicant to obtain approval of an NDA for a new chemical entity (“NCE”). A drug is a new chemical entity if the FDA has not previously approved any other new drug containing the same active moiety, which is the molecule or ion responsible for the action of the drug substance. During the NCE exclusivity period, the FDA may not accept for review an abbreviated new drug application (“ANDA”), or an NDA submitted under Section 505(b)(2) (505(b)(2) NDA) submitted by another company for another drug based on the same active moiety, regardless of whether the drug is intended for the same indication as the original innovative drug or for another indication, where the applicant does not own or have a legal right of reference to all the data required for approval. However, an ANDA or 505(b)(2) NDA may be submitted after four years after the NCE’s NDA approval if the application contains a certification of patent invalidity or non-infringement to one of the patents listed with the FDA by the innovator NDA holder.

The FDCA alternatively provides three years of marketing exclusivity for an NDA, or supplement to an existing NDA if new clinical investigations (“NCI”), other than bioavailability studies, that were conducted or sponsored by the applicant are deemed by the FDA to be essential to the approval of the application, for example new indications, dosages or strengths of an existing drug. This three-year NCI exclusivity covers only the modification for which the drug received approval on the basis of the new clinical investigations and does not prohibit the FDA from approving ANDAs or 505(b)(2) NDAs for drugs containing the active agent for the original indication or condition of use. Five-year

NCE exclusivity and three-year NCI exclusivity will not delay the submission or approval of a full NDA. However, an applicant submitting a full NDA would be required to conduct, or obtain a right of reference to, all of the preclinical studies and adequate and well-controlled clinical trials necessary to demonstrate safety and effectiveness.

Pediatric exclusivity is another type of marketing exclusivity available in the United States. Pediatric exclusivity provides for an additional six months of marketing exclusivity attached to another period of exclusivity, the latest of existing patent or regulatory exclusivity to which the drug is entitled, if a sponsor conducts clinical trials in children that “fairly respond” to a written request for pediatric studies from the FDA. A sponsor may request FDA to issue such a written request. The issuance of a written request does not require the sponsor to undertake the described clinical trials.

Other Healthcare Laws

Pharmaceutical companies are subject to additional healthcare regulation and enforcement by the federal government and by authorities in the states and foreign jurisdictions in which they conduct their business and may constrain the financial arrangements and relationships through which we research as well as sell, market and distribute any products for which we obtain marketing approval. Such laws include, without limitation, federal and state anti-kickback, fraud and abuse, false claims, data privacy and security and physician and other healthcare provider transparency laws and regulations. If our significant operations are found to be in violation of any of such laws or any other governmental regulations that apply, they may be subject to penalties, including, without limitation, administrative, civil and criminal penalties, damages, fines, disgorgement, the curtailment or restructuring of operations, integrity oversight and reporting obligations, exclusion from participation in federal and state healthcare programs and imprisonment.

Coverage and Reimbursement

Sales of any product depend, in part, on the extent to which such product will be covered by third-party payors, such as federal, state, and foreign government healthcare programs, commercial insurance and managed healthcare organizations, and the level of reimbursement for such product by third-party payors. Decisions regarding the extent of coverage and amount of reimbursement to be provided are made on a plan-by-plan basis. The coverage determination process is often a time-consuming and costly process that will require us to provide scientific and clinical support for the use of our products to each payor separately, with no assurance that coverage and adequate reimbursement will be obtained. These third-party payors are increasingly reducing reimbursements for medical products, drugs and services. In addition, the U.S. government, state legislatures and foreign governments have continued implementing cost-containment programs, including price controls, restrictions on coverage and reimbursement and requirements for substitution of generic products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit sales of any product. Decreases in third-party reimbursement for any product or a decision by a third-party payor not to cover a product could reduce physician usage and patient demand for the product and also have a material adverse effect on sales.

Healthcare Reform

In March 2010, the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act, each as amended (collectively known as the “ACA”), was enacted, which substantially changed the way healthcare is financed by both governmental and private insurers, and significantly affected the pharmaceutical industry. The ACA contains a number of provisions, including those governing enrollment in federal healthcare programs, reimbursement adjustments and changes to fraud and abuse laws. By way of example, the ACA:

•        increased the minimum level of Medicaid rebates payable by manufacturers of brand name drugs from 15.1% to 23.1% of the average manufacturer price;

•        required collection of rebates for drugs paid by Medicaid managed care organizations;

•        required manufacturers to participate in a coverage gap discount program, under which they must agree to offer 70 percent point-of-sale discounts off negotiated prices of applicable brand drugs to eligible beneficiaries during their coverage gap period, as a condition for the manufacturers’ outpatient drugs to be covered under Medicare Part D; and

•        imposed a non-deductible annual fee on pharmaceutical manufacturers or importers who sell “branded prescription drugs” to specified federal government programs.

Other legislative changes have been proposed and adopted in the United States since the ACA was enacted. On August 16, 2022, the Inflation Reduction Act of 2022 (“IRA”) was signed into law. The IRA included, among other provisions, several measures intended to lower the cost of prescription drugs and related healthcare reforms. Specifically, the IRA authorizes and directs the Centers for Medicare and Medicaid Services (“CMS”) to set drug prices for certain Medicare Part B and Part D qualified drugs with the greatest expense to the program, with the first year of maximum price applicability to begin in 2026 and an expanding list of selected drugs each year after. The IRA further authorizes CMS to levy a financial penalty on pharmaceutical manufacturers that increase the price of certain Medicare Part B and Part D drugs faster than the rate of inflation. Finally, the IRA creates significant changes to the Medicare Part D benefit design by capping Part D beneficiaries’ annual out-of-pocket spending at $2,000 beginning in 2025 and creating new financial liabilities for drug manufacturers and health plans providing Part D benefits. In addition, the Center for Medicare and Medicaid Innovation (CMMI) has announced two new mandatory models that propose MFN pricing for certain products covered by Medicare and one new voluntary model that proposes MFN pricing for products covered by Medicaid. These models, or other models announced by CMMI could result in significantly lower reimbursement for products. We cannot be sure whether additional or related legislation or rulemaking will be issued or enacted, or what impact, if any, such changes will have on the profitability of any of our drug candidates, if approved for commercial use, in the future.

Moreover, there has recently been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products, which has resulted in several Congressional inquiries, proposed and enacted legislation and executive orders issued by the President designed to, among other things, bring more transparency to product pricing, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drug products. Individual states in the United States have also become increasingly active in implementing regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.

Europe and Rest of World Government Regulation

Our regulatory strategy involves filing clinical trial applications for our early-stage clinical trials in jurisdictions outside of the United States to support enrollment in our clinical trials. As a result, in addition to regulations in the United States, we expect to be subject to a variety of regulations in other jurisdictions that we may in the future select to test or commercialize our product candidates, which may govern, among other things, clinical trials and any commercial sales and distribution of our products. Whether or not we obtain FDA approval of a product, we would need to obtain the requisite approvals from regulatory authorities in foreign countries prior to the commencement of clinical trials or marketing of the product in those countries. Certain countries outside of the United States have a similar process that requires the submission of a clinical trial application much like the IND prior to the commencement of human clinical trials. In the EU, for example, a CTA must be submitted to each country’s national health authority and an EC, much like the FDA and IRB, respectively. Once the CTA is approved in accordance with a country’s requirements, clinical trial development may proceed.

The requirements and process governing the conduct of clinical trials, product licensing, pricing, and reimbursement vary from country to country. In all cases, the clinical trials must be conducted in accordance with GCPs and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

To obtain regulatory approval of an investigational drug or biological product under EU regulatory systems, we must submit a marketing authorization application, either under a centralized procedure administered by the European Medicines Agency or one of the procedures administered by competent authorities in the EU member states. The application used to file the NDA in the United States is similar to that required in the EU, with the exception of, among other things, country-specific document requirements.

For other countries outside of the EU, the requirements governing the conduct of clinical trials, product licensing, pricing, and reimbursement vary from country to country. In all cases, again, the clinical trials must be conducted in accordance with GCPs and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

If we or our potential collaborators fail to comply with applicable foreign regulatory requirements, we may be subject to, among other things, fines, suspension or withdrawal of regulatory approvals, product recalls, seizure of products, operating restrictions, and criminal prosecution.

Data Privacy, Information Security and Cybersecurity Laws

In the ordinary course of business, we process personal data, and other sensitive information, including proprietary and confidential business data, trade secrets, intellectual property, sensitive third-party data, business plans, transactions, financial information, and data we collect about trial participants in connection with clinical trials, or collectively, sensitive data. Accordingly, we are subject to numerous data privacy and security obligations, including foreign and U.S. federal, state, and local laws, regulations, guidance, industry standards, external and internal privacy and security policies, contractual requirements, and other obligations related to data privacy and security.

These data privacy and security laws are evolving and may impose potentially conflicting obligations. Such obligations may include, without limitation, the Federal Trade Commission Act, the GDPR, DSP, and HIPAA, as amended by HITECH. In addition, over the past few years, numerous U.S. states have enacted comprehensive privacy laws that impose certain obligations on covered businesses, and similar laws are being considered in several other states, as well as at the U.S. federal level. These new laws are examples of the increasingly stringent and evolving regulatory frameworks related to personal data processing that may increase our compliance obligations and exposure for any noncompliance.

Additionally, because we collect personal data from individuals outside of the United States, through clinical trials or otherwise, we are, or may become, subject to foreign data privacy and security laws, such as the GDPR. Foreign data privacy and security laws impose significant and complex compliance obligations on entities that are subject to those laws. For example, the GDPR applies to any company established in the EEA processing personal data and to companies established outside the EEA that process personal data in connection with the offering of goods or services to data subjects in the EEA or the monitoring of the behavior of data subjects in the EEA. These obligations may include limiting personal data processing to only what is necessary for specified, explicit, and legitimate purposes, requiring a legal basis for personal data processing, requiring the appointment of a data protection officer in certain circumstances, imposing transparency obligations in relation to data subjects, requiring data protection impact assessments in certain circumstances, limiting the collection and retention of personal data, establishing rights for data subjects; formalizing a heightened and codified standard for data subject consents, requiring the implementation and maintenance of technical and organizational safeguards for personal data, mandating notice of certain personal data breaches to the relevant supervisory authority(ies) and affected individuals, and mandating the appointment of representatives in the EU in certain circumstances. For more information, see the risk factor in this prospectus titled “We and our service providers may be subject to a variety of privacy and data security laws and contractual obligations, which could increase compliance costs, and our actual or perceived failure to comply with such laws and obligations could subject us to potentially significant liability, fines or penalties and otherwise harm our business.”

Facilities

Our principal executive office is located at 1104 West Broad Street #1029, Falls Church, Virginia 22046. We currently do not lease any research and development, laboratory, or office space. We believe that suitable facilities will be available in the future if and when needed.

Legal Proceedings

From time to time, we may be subject to various legal proceedings and claims that arise in the ordinary course of our business. Regardless of the outcome, litigation can have a material adverse effect on us because of defense and settlement costs, diversion of management resources, and other factors. We are not currently a party to any legal proceeding, and we are not aware of any pending or threatened legal proceeding against us that we believe, individually or taken together, could have a material adverse effect on our business, operating results or financial condition.

Management

Executive Officers and Directors

Set forth below is certain biographical and other information regarding our directors and our executive officers as of September 18, 2026.

____________

*        Appointed to join the board of directors effective as of, and contingent upon, the closing of this offering.

The following are brief biographies describing the backgrounds of our executive officers and directors.

Executive Officers

Eric Keller, J.D. has served as our CEO and a director since the Company’s inception in July 2023. Mr. Keller has been a manager of Redux since 2017; co-founder and director of Response since 2021 where he has led the development of a Phase 2 clinical asset for antipsychotic-induced weight gain and post-GLP-12 weight rebound; and co-founder, CEO and director of Restor since September 2024. Since 2022, Mr. Keller has been the acting President and a director of Noveome Biotherapeutics, Inc., where he led the development of ST-266, a non-cellular biologic for the treatment of necrotizing enterocolitis in neonatal infants, and a member of the board of directors of SGH2 Energy Global, Inc. a company focused on the production of green hydrogen from biogenic waste. He is also the founder and a senior advisor of Hyperion Biosystems, Inc. since January 2014, where he has helped guide the development of a suite of pioneering medical diagnostic technologies. From September 2015 to September 2024, Mr. Keller was Chief Business Officer of SipNose, Ltd., where he helped lead the development of a novel direct-nose-to-brain delivery device and drug-device combination products and sale of the company to AptarGroup, Inc. From January 2006 to July 2014, Mr. Keller was the co-founder and CEO at Nano Terra, Inc., where he led numerous industrial partnerships around the company’s surface chemistry platform and the acquisition of Surface Logix and the subsequent out-license of three clinical assets, including RTN-001 and Rezurock. Mr. Keller received his A.B. from Harvard College and J.D. from Boston College. We believe that Mr. Keller is qualified to serve on our board of directors because of his executive leadership roles at multiple biopharmaceutical companies and extensive industry knowledge.

Alex Schwartz has served as our Chief Financial Officer since April 2026. Most recently, from August 2025 to March 2026, Mr. Schwartz was the Vice President of Financial Planning & Analysis and Investor Relations at Ventyx Biosciences, Inc. (“Ventyx”) (acquired by Eli Lilly and Company). Prior to his tenure at Ventyx, Mr. Schwartz held roles of increasing responsibility in finance and investor relations at Allakos Inc. as Vice President, Strategic Finance and Investor Relations from August 2021 to May 2025, NGM Biopharmaceuticals, Inc. as Executive Director of Investor Relations from August 2020 to August 2021 and Esperion Therapeutics, Inc. as Senior Director of Investor Relations from April 2018 to July 2020. Earlier in his career, Mr. Schwartz served as Vice President, Biotechnology Equity Research analyst at Stifel, Nicolaus & Company, with a coverage focus on small- and mid-cap biotechnology companies. Mr. Schwartz began his career as a trader at Schonfeld Group. He holds an M.B.A. in finance from Boston College and a Bachelor’s degree in Finance from Indiana University.

Paul Sweetnam, Ph.D. has served as our CSO since the Company’s inception in July 2023. Dr. Sweetnam previously served on our board of directors from the Company’s inception in July 2023 until November 2023. Dr. Sweetnam is currently a Technical Consultant for US Biologicals since January 2018; a manager of Redux; co-founder and CSO of Response since September 2021; and co-founder CSO and director of Restor since September 2024. From August 2001 to February 2011, Dr. Sweetnam was the CSO at Surface Logix, Inc. where he led research and development efforts to progress three candidate molecules from early drug discovery through early-stage clinical development, including RTN-001. From February 2011 through February 2019, Dr. Sweetnam served as Vice President of Research at Nano Terra, Inc. From March 1996 to March 2001, Dr. Sweetnam was the Vice President of Research Technologies at Bayer AG. From August 1988 to February 1996, Dr. Sweetnam held senior roles at Pfizer Inc. (NYSE: PFE) and Nova Pharmaceuticals, Inc. (acquired by Scios Therapeutics, Inc.). Dr. Sweetnam received his B.S. in Biology from University of Maine and his Ph.D. in Biology at Georgetown University, completed his postdoctoral fellowship in the Departments of Psychiatry and Pharmacology at Yale University School of Medicine, and was an assistant professor in the Miami Project to Cure Paralysis at the University of Miami School of Medicine.

Alison D. Schecter, M.D. has served as our Chief Medical Officer since February 2026. From 2024 to 2025, Dr. Schecter was the Senior Vice President and Head of Clinical Development at Mineralys Therapeutics, Inc. (Nasdaq: MLYS), where she oversaw the completion of three successful registration trials in resistant hypertension. Previously, she served as Chief Executive Officer of Molecules to Medicine Advisory Group, a consultancy group serving venture capital firms and other investor platforms from July 2022 to January 2026.  From March 2021 to May 2022, Dr. Schecter was President, Research and Development, of Axcella Health Inc., a Flagship biotechnology company focused on developing endogenous metabolic modulators. Previously, from July 2019 to February 2021, Dr. Schecter served as Chief Medical Officer at Selecta Biosciences, Inc. and from January 2016 to June 2019 as Global Project Head and business development liaison, Rare Diseases at Sanofi-Genzyme garnering U.S. and Japan approval of Xenpozyme®, the first and only FDA approved disease-specific treatment for non–central nervous system manifestations of acid sphingomyelinase deficiency in adults and children. From January 2015 to June 2016, Dr. Schecter was Head of Hemophilia Programs at Baxalta Incorporated, until its acquisition by Shire plc (Nasdaq: SHPG), where she was instrumental in obtaining multinational approvals for Adynovate and advancing other hematologic candidates. Earlier, she held roles of increasing responsibility in translational medicine, cardiovascular and metabolism product innovation at the Northeast J&J Innovation Center and the Novartis Institutes of Biomedical Research. Dr. Schecter currently serves on the scientific advisory boards of Rapafusyn Pharmaceuticals, Inc. since September 2020 and Tectonic Therapeutic, Inc. (Nasdaq: TECX) since October 2019. Prior to transitioning to industry, Dr. Schecter, an Associate Professor (now adjunct) in the departments of Immunology and Medicine, is a nationally and internationally recognized researcher in the areas of inflammation, vascular biology, and thrombosis and was the co-founder of the Cardiovascular Research Institute at the Icahn School of Medicine at Mount Sinai. Dr. Schecter received a B.A. in Biology and History from Mount Holyoke College and an M.D. from SUNY Downstate Health Sciences University. She completed a three-year residency in internal medicine at Johns Hopkins, a Cardiology fellowship at Massachusetts General Hospital and a Research Fellowship at Mount Sinai School of Medicine and board certifications in Internal Medicine and Cardiology.

Sabine Bisson, Ph.D. has served as our Chief Operating Officer since January 2024. She has nearly 20 years of experience in biopharmaceutical drug development across oncology, immunology, and cardiometabolic diseases, spanning programs from preclinical development through global regulatory approval and commercialization. Prior to her current roles, Dr. Bisson served as Vice President, Development Leadership at Volastra Therapeutics, Inc. from July 2022 to July 2023 and as Executive Director, Program Lead and Head of the Program & Portfolio Management Office at Cellectis S.A. from January 2021 to July 2022. She previously held positions of increasing responsibility at Regeneron Pharmaceuticals, Inc. from October 2008 to January 2021, including serving as a program lead for immuno-oncology and cardiometabolic assets. With extensive experience in development and regulatory approval processes, including global submissions, she has played a key role in bringing drugs, including Praluent®, Dupixent®, and Libtayo® to market across multiple indications. Dr. Bisson received her Ph.D. in Biochemistry and Molecular Biology from the University of Calgary and completed postdoctoral research at the Howard Hughes Medical Institute at the University of California, San Francisco.

Non-Employee Directors

Michael Joseph Berendt, Ph.D. has served as Chairman of our board of directors since December 2023. Dr. Berendt has served as Chairman of the board of directors of Response since 2022 and he is expected to assume the role of interim CEO of Restor in the near future upon Mr. Keller’s anticipation resignation as a CEO of Restor. From 2017 to 2023, Dr. Berendt was a life sciences industry consultant. From November 2013 to November 2016, Dr. Berendt was the CEO and Chief Scientist of Telesta Therapeutics Inc. From July 2011 to November 2013, Dr. Berendt was a life sciences industry consultant. From March 2006 to July 2011, Dr. Berendt served as the President and CEO of Aegera Therapeutics Inc. From August 2004 to December 2005, Dr. Berendt served as Managing Director of Research Corporation Technologies, Inc. From November 2000 to August 2004, Dr. Berendt served as Managing Director of AEA Investors LP. Dr. Berendt also worked for 18 years, from 1982 to 2000, in the pharmaceutical industry where he served in a number of senior management positions including Senior Vice President of Research for the Pharmaceutical Division of Bayer AG, and a Group Director of Drug Discovery at Pfizer Inc. Dr. Berendt previously served on the board of directors of Waters Corporation from 1998 to October 2021. Dr. Berendt received his B.S. in Biology from Ohio Dominican College, M.S. in Microbiology from Miami University and Ph.D. in Medical Microbiology and Immunology from The Hahnemann Medical College. We believe that Dr. Berendt is qualified to serve on our board of directors because of the valuable technical insight he brings from his experience in the pharmaceutical industry both from a management and a scientific perspective.

Franklin M. Berger has served on our board of directors since December 2025. Mr. Berger has more than 25 years of experience in capital markets and financial analysis. Mr. Berger also serves on the board of directors of Satellos Biosience Inc. (Nasdaq: MSLE) since September 2023, and Kezar Life Sciences, Inc. (Nasdaq: KZR) since January 2016. Mr. Berger previously served on the board of directors of ESSA Pharma Inc. from March 2015 to October 2025, Rain Therapeutics, Inc. from May 2020 to January 2024, Atreca Inc. from October 2014 to May 2024, BELLUS Health, Inc. from May 2010 to June 2023, Tocagen, Inc. from October 2014 to December 2020, Proteostasis Therapeutics, Inc. from February 2016 to December 2020 and Five Prime Therapeutics, Inc. from October 2014 to April 2021. From January 2007 to June 2008, Mr. Berger worked at Sectoral Asset Management Inc., an investment management firm, as a founder of the small-cap focused NEMO Fund. Prior to that, he served at J.P. Morgan Securities, a securities brokerage company, most recently as Managing Director, Equity Research and Senior Biotechnology Analyst, and served in similar capacities at investment banking firms Salomon Smith Barney and Josephthal & Co. Mr. Berger received his B.A. in International Relations from Johns Hopkins University, M.A. in International Economics from Johns Hopkins University and M.B.A from Harvard University. He serves on the Council of Rockefeller University and was a Founding Fellow of the Biotechnology Study Center at New York University School of Medicine. We believe that Mr. Berger is qualified to serve on our board of directors based on his extensive pharmaceutical- and biotechnology-focused investment-related experience.

Donald Olds, M.B.A. has served on our board of directors since November 2023. Mr. Olds also serves on the board of directors of a number of U.S. and Canadian public and private companies, including Response since 2022, Agrinam Acquisition Corp. (TSX: AGRI.U) since 2022, Cannara Biotech Inc. (TSX: LOVE) since 2020, Aifred Health Inc. since 2019, Grace Therapeutics, Inc. (Nasdaq: GRC) since 2018 and GoodFood Markets Corp. (TSX: FOOD) since 2017. From 2012 to 2019, Mr. Olds was the President and Chief Executive Officer of NEOMED Institute or chair of the board of directors, where he led its successful merger with Centre for Drug Research and Development to form adMare BioInnovations, a life sciences innovation enterprise in Canada. Prior to that Mr. Olds held executive positions at multiple private and public biotechnology companies. Mr. Olds currently serves as the lead director and audit committee chair of Goodfood Market Corp., and Cannara Biotech Inc. Mr. Olds received his B.Sc. in Agriculture from the University of British Columbia, M.Sc. in Renewable Resources from McGill University and M.B.A. from McGill University. We believe that Mr. Olds is qualified to serve on our board of directors because of his extensive experience and industry knowledge and governance expertise from serving on multiple public, private and not-for-profit boards and holding senior executive positions in private and public life sciences companies.

Non-Employee Director Joining the Board Upon the Closing of This Offering

Our board of directors has appointed Dr. Pavan Cheruvu to serve as a director, effective as of, and contingent upon, the closing of this offering.

Pavan Cheruvu, M.D. has served as the Chief Executive Officer of Amanat Acquisition Corp. since May 2026 and has served on the board of directors of Imbria Pharmaceuticals since September 2025. From March 2022 to February 2026, Dr. Cheruvu was the President and Chief Executive Officer of Bitterroot Bio, a biotechnology company focused

on developing therapies in the field of cardio-immunology. From December 2015 to March 2018, he was a member of the executive team at Roivant Sciences and from March 2018 to March 2022, he was the President and Chief Executive Officer of Sio Gene Therapies. From June 2008 to June 2011, he was a management consultant at McKinsey & Company, where he focused on organizational and R&D strategy serving large- and mid-cap biopharmaceutical companies. Over the course of his career, Dr. Cheruvu has worked with multiple biotechnology and medical device companies with focus areas spanning neurology, oncology, women’s health and cardiology. Prior to his roles in academia and industry, he served as a policy intern at the Office of Science and Technology Policy at the White House. Dr. Cheruvu received in B.S. in Biomedical Engineering and Electrical Engineering from Duke University, M.Sc in Computer Science from the University of Oxford, and M.D. from Harvard University and the Massachusetts Institute of Technology. We believe that Dr. Cheruvu is qualified to serve on our board of directors because of his scientific and medical expertise and extensive leadership experience in the biopharmaceutical and life sciences industries.

Scientific Advisory Board

Our Scientific Advisory Board is composed of physicians and investigators with expertise in hypertension, nephrology and cardiology. Our Scientific Advisory Board provides us with insight and advice on the clinical development of RTN-001, including the diagnosis and management of uHTN and rHTN, cardiorenal disease and the design and conduct of clinical trials to evaluate cardiovascular-related diseases. We consult with individual members of our Scientific Advisory Board from time to time on matters within their respective areas of expertise. Each member of our Scientific Advisory Board is employed by, or has consulting, teaching, clinical or other commitments to, academic or medical institutions or other entities other than us, and devotes only a limited portion of his time to our affairs. The members of our Scientific Advisory Board are not our employees. The current members of our Scientific Advisory Board are set forth below.

Omar Al Dhaybi, M.D., M.Sc, FASN is a hypertension specialist and Director of the American Heart Association Comprehensive Hypertension Center at Mount Sinai Fuster Heart, where he serves as Assistant Professor of Medicine at the Icahn School of Medicine at Mount Sinai. He completed his nephrology fellowship at the University of Chicago, followed by advanced subspecialty training in hypertension at the American Heart Association Comprehensive Hypertension Center at the University of Chicago under Dr. George Bakris. Dr. Al Dhaybi is board certified in hypertension by the American Heart Association. His clinical practice and research focus on resistant and secondary hypertension, including hypertension associated with chronic kidney disease, hypertension associated with endocrine disorders, renovascular disease, autonomic disorders, and hypertension in pregnancy.

James L. Januzzi, M.D. is the Adolph Hutter Professor of Medicine at Harvard Medical School and has been a member of the Massachusetts General Hospital Cardiology Division since 2000, where he directs the Dennis and Marilyn Barry Fellowship in Cardiology Research. He is also the Chief Scientific Officer and C. Michael Gibson Chair at the Baim Institute for Clinical Research. Dr. Januzzi completed his residency in internal medicine at Brigham and Women’s Hospital, followed by a cardiology and echocardiography fellowship at Massachusetts General Hospital, and is board certified in internal medicine by the American Board of Internal Medicine. His clinical practice focuses on heart failure and chronic coronary artery disease, and his research focuses on cardiac biomarker testing. Dr. Januzzi has published more than 1000 manuscripts, is routinely among the top 1% most cited authors in cardiology and was named the 2024 ACC Distinguished Clinical Researcher.

Luke J. Laffin, M.D. is a preventive cardiologist and hypertension specialist in the Preventive Cardiology and Rehabilitation Section of the Robert and Suzanne Tomsich Department of Cardiovascular Medicine at the Sydell and Arnold Miller Family Heart, Vascular and Thoracic Institute at Cleveland Clinic, where he has been on staff since 2018. He is also the Medical Director of the Cleveland Clinic Coordinating Center for Clinical Research (C5Research) and an Associate Professor of Medicine within the Cleveland Clinic Lerner College of Medicine at Case Western Reserve University. Dr. Laffin received his medical degree from Vanderbilt University School of Medicine, completed his residency at the University of Chicago and completed fellowships there in hypertensive diseases and cardiovascular disease. His clinical and research focus centers on hypertension, lipid disorders, obesity and cardiometabolic disease. Dr. Laffin currently serves as Chair of the Steering Committee for our ongoing Phase 2b clinical trial of RTN-001.

Professor Ian Wilkinson is a clinical pharmacologist and researcher in hypertension and cardiovascular disease. He serves as Professor of Therapeutics at the University of Cambridge, where he leads the Division of Experimental Medicine and Immunotherapeutics and directs the Cambridge Clinical Trials Unit and the Office of Translational Research. He is also an Honorary Consultant Physician in Clinical Pharmacology and General Medicine

at Cambridge University Hospitals. Professor Wilkinson’s research centers on the physiology and pharmacology of the cardiovascular system, with a particular focus on hypertension, arterial stiffness and endothelial function. Over more than 30 years, he has led numerous national and international trials and studies aimed at understanding the causes of hypertension and identifying optimal treatments, and his group has developed research partnerships with a range of pharmaceutical and device companies. Professor Wilkinson currently serves as President of the British and Irish Hypertension Society, where he has helped lead the development of national hypertension guidelines. He is a Fellow of the British Hypertension Society, a Fellow of the British Pharmacological Society and a Fellow of the American Heart Association.

Randall M. Zusman, M.D. is the Director of the Division of Hypertension at the Massachusetts General Hospital Heart Center in Boston, Massachusetts, and an Associate Professor of Medicine at Harvard Medical School. Dr. Zusman has been designated a Specialist in Clinical Hypertension by the American Society of Hypertension. Dr. Zusman received his M.D. from Yale University School of Medicine and completed his internship, residencies and chief residency at Massachusetts General Hospital, followed by fellowships at the National Heart, Lung and Blood Institute and in the Cardiology Unit at Massachusetts General Hospital. His primary clinical interests are the evaluation and treatment of patients with hypertension, hypercholesterolemia, atrial fibrillation and angina pectoris, and cardiac risk reduction strategies.

Family Relationships

Our executive officers are appointed by, and serve at the discretion of, our board of directors. There are no family relationships among any of our directors, including Dr. Cheruvu, who will join the Board upon the closing of the offering, or executive officers.

Board Composition

Our board of directors currently consists of four members: Messrs. Keller, Berger, Olds and Dr. Berendt. Our Board has appointed Dr. Cheruvu to serve as a director, effective as of, and contingent upon, the closing of this offering. Our Bylaws, which will be effective immediately prior to the closing of this offering, will provide that the authorized number of directors shall be fixed from time to time by resolution of our board of directors.

Certain members of our current board of directors were elected pursuant to the provisions of a voting agreement, which will terminate upon the closing of this offering as described further in “Certain Relationships and Related Party Transactions — Voting Agreement.”

On August 12, 2026, Mr. Sincock, a former member of our board of directors, resigned as a director effective immediately. On August 12, 2026, the Company and CRS Capital Ventures I, LLC, an entity controlled by Mr. Sincock, executed that certain Termination of Consulting Agreement (the “Termination Agreement”) to the August 1, 2025 Consulting Agreement entered between the Company and CRS Capital Ventures I, LLC (the “CRS Consulting Agreement”) to be effective immediately upon the closing of this offering. As contemplated in the CRS Consulting Agreement, the Termination Agreement acknowledged that the unvested portion of the warrants to purchase 48,310 shares of the Company’s common stock will vest in full as of the closing of this offering. See “Certain Relationships and Related Party Transactions — CRS Consulting Agreement and Termination Agreement.”