6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

For the month of June 2025

Commission file number: 001-41842

Abivax SA

(Exact name of Registrant as specified in its charter and translation of Registrant’s name into English)

7-11 boulevard Haussmann

75009 Paris, France

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-

Form 20-F ☒ Form 40-F ☐

On June 2, 2025, Abivax SA (the "Registrant") announced its financial results as of and for the three months ended

March 31, 2025 and issued a press release and its unaudited interim condensed consolidated financial statements,

copies of which are attached hereto as Exhibits 99.1 and 99.2, respectively, and incorporated herein by reference.

Incorporation by Reference

This Report on Form 6-K, including Exhibits 99.1 and 99.2, except for the quotes contained therein, shall be deemed

to be incorporated by reference into the Registrant’s registration statements on Form F-3 (File No. 333-283336) and

Form S-8 (File No. 333-286069) and to be part thereof from the date on which this Report is filed, to the extent not

superseded by documents or reports subsequently filed.

Exhibit Index
Exhibit 99.1	Press release, dated June 2, 2025
Exhibit 99.2	Unaudited Interim Condensed Consolidated Financial Statements

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be

signed on its behalf by the undersigned, thereunto duly.

	Abivax SA<br><br>(Registrant)
Date: June 2, 2025	/s/ Marc de Garidel
	Chief Executive Officer

Exhibit 99.2

Unaudited Interim Condensed Consolidated Financial Statements

	Page
INTRODUCTION.................................................................................................................	1
RISK FACTORS...................................................................................................................	3
OPERATING RESULTS........................................................................................................	4	INDEX TO THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL<br><br>STATEMENTS.........................................................	F-1
---	---

INTRODUCTION

Unless otherwise indicated or the context otherwise requires, “Abivax,” “the Company,” “the Group,” “we,” “us”

and “our” refer to Abivax SA and its consolidated subsidiary, taken as a whole.

“Abivax” and the Abivax logo and other trademarks or service marks of Abivax SA appearing in this quarterly

report are the property of Abivax SA. Solely for convenience, the trademarks, service marks and trade names

referred to in this quarterly report are listed without the ® and ™ symbols, but such references should not be construed

as any indicator that their respective owners will not assert, to the fullest extent under applicable law, their right

thereto. All other trademarks, trade names and service marks appearing in this quarterly report are the property of

their respective owners. We do not intend to use or display other companies’ trademarks and trade names to imply

any relationship with, or endorsement or sponsorship of us by, any other companies.

This quarterly report includes our unaudited condensed consolidated financial statements of financial position as of

March 31, 2025 and December 31, 2024 and the related unaudited condensed consolidated statements of loss,

comprehensive loss and changes in shareholders' equity for each of the three-month periods ended March 31, 2025

and March 31, 2024 and the unaudited condensed consolidated statements of cash flows for the three-month periods

ended March 31, 2025 and March 31, 2024, prepared in accordance with International Financial Reporting

Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”) and adopted by the

European Union ("EU") regulation n°1606/2022 of July 19, 2022. None of our financial statements were prepared in

accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). Our financial statements are

presented in euros and, unless otherwise stated, all monetary amounts are in euros. All references in this quarterly

report to “$”, “U.S. dollars” and “dollars” mean U.S. dollars, and all references to “€”, “EUR” and “euros” mean

European Monetary Union euros, unless otherwise noted. Throughout this quarterly report, references to "ADSs"

mean American Depositary Shares (“ADSs”) or ordinary shares represented by such ADSs, as the case may be.

Special Note Regarding Forward-Looking Statements

This quarterly report contains forward-looking statements within the meaning of Section 27A of the Securities Act

of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended ("Exchange Act"), that

are based on our management’s beliefs and assumptions and on information currently available to our management.

All statements other than present and historical facts and conditions contained in this quarterly report, including

statements regarding our future results of operations and financial positions, business strategy, plans and our

objectives for future operations, are forward-looking statements. When used in this quarterly report, the words

“anticipate,” “believe,” “can,” “could,” “estimate,” “expect,” “intend,” “is designed to,” “may,” “might,” “plan,”

“will,” “would,” “potential,” “predict,” “objective,” “should,” or the negative of these and similar expressions

identify forward-looking statements. Forward-looking statements include, but are not limited to, statements about:

•the prospects of attaining, maintaining and expanding marketing authorization for our drug candidates;

•the potential attributes and clinical advantages of our drug candidates;

•the initiation, timing, progress and results of our preclinical and clinical trials (and those conducted by third

parties) and other research and development programs;

•the timing of the availability of data from our clinical trials;

•the timing of and our ability to advance drug candidates through clinical development;

•the timing or likelihood of regulatory meetings and filings;

•the timing of and our ability to obtain and maintain regulatory approvals for any of our drug candidates;

•our ability to identify and develop new drug candidates from our preclinical studies;

•our ability to develop sales and marketing capabilities and transition into a commercial-stage company;

•the effects of increased competition as well as innovations by new and existing competitors in our industry;

•our ability to enter into strategic relationships or partnerships;

•our ability to obtain, maintain, protect and enforce our intellectual property rights and propriety

technologies and to operate our business without infringing the intellectual property rights and proprietary

technology of third parties;

•our expectations regarding our cash requirements;

•our estimates regarding expenses, future revenues, capital requirements and the need for additional

financing;

•the impact of government laws and regulations;

•our competitive position; and

•unfavorable conditions in our industry, the global economy or global supply chain, including financial and

credit market fluctuations, international trade relations, political turmoil, natural catastrophes, warfare (such

as the Russia-Ukraine war and the Israel-Hamas war), and terrorist attacks.

We encourage you to read and carefully consider all of the risk factors disclosed in our annual report on Form 20-F

for the year ended December 31, 2024 filed with the Securities and Exchange Commission (“SEC”) on March 24,

2025 (the “Annual Report”) under the caption “Item 3.D—Risk Factors” for a more complete understanding of the

risks and uncertainties material to our business, including important factors that may cause our actual results to

differ materially from those expressed or implied by our forward-looking statements. As a result of these factors, we

cannot assure you that the forward-looking statements in this document will prove to be accurate. Furthermore, if

our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant

uncertainties in these forward-looking statements, you should not regard these statements as a representation or

warranty by us or any other person that we will achieve our objectives and plans in any specified time frame or at

all. These forward-looking statements represent our plans, objectives, estimates, expectations and intentions only as

of the date of this filing. We undertake no obligation to publicly update any forward-looking statements, whether as

a result of new information, future events or otherwise, except as required by law.

You should read this document and the documents that we reference herein completely and with the understanding

that our actual future results may be materially different from what we expect. We qualify all of our forward-looking

statements by these cautionary statements.

This quarterly report contains market data and industry forecasts that were obtained from industry publications.

These data involve a number of assumptions and limitations, and you are cautioned not to give undue weight to such

estimates. We have not independently verified any third-party information. While we believe the market position,

market opportunity and market size information included in this quarterly report is generally reliable, such

information is inherently imprecise.

Rounding of Figures

Certain figures (including data expressed in thousands or millions of euros or dollars) and the percentages presented

in this quarterly report have been rounded up or down. Accordingly, totals given may vary slightly from those

obtained by adding the exact (unrounded) values of those same figures.

RISK FACTORS

The Company’s business faces significant risks. You should carefully consider all of the information set forth in this

document and in the Company’s other filings with the SEC, including the risk factors which the Company faces and

which are faced by the Company’s industry described in “Item 3.D—Risk Factors” of the Company’s Annual

Report on Form 20-F for the fiscal year ended December 31, 2024. Our risk factors have not changed materially

from those described in our Annual Report on Form 20-F. Our business, financial condition or results of operations

could be materially adversely affected by any of these risks.

OPERATING RESULTS

Overview

We are a clinical-stage biotechnology company focused on developing therapeutics that harness the body’s

natural regulatory mechanisms to stabilize the immune response in patients with chronic inflammatory diseases. Our

lead drug candidate, obefazimod, is currently being evaluated in the following indications:

•Ulcerative colitis (“UC”): Phase 3 clinical trials for the treatment of adults with moderately to severely

active UC are ongoing (“ABTECT”). On April 29, 2025, we announced that our ABTECT trials reached

full enrollment. Top-line results from the ABTECT 8-week induction trial are expected in the third quarter

of 2025, with the 44-week maintenance data read-out expected during the second quarter of 2026.

•Crohn’s disease (“CD”): On October 3, 2024, we announced the first patient enrolled in our ENHANCE-

CD Phase 2b clinical trial of obefazimod in patients with CD with the 12-week induction data read-out

expected in second half of 2026.

•Combination therapy: In September 2024, we announced initial preclinical combination data of obefazimod

combined with etrasimod in a mouse model of inflammatory bowel diseases (“IBD"). The results showed

that treatment with the combination improved the response on body weight protection and Disease Activity

Index and a synergistic and statistically significant reduction of several cytokines (TNFa, IL-17, IL-6,

IFNg) in the blood compared to each drug alone. Additional preclinical data to support our decision-making

on a combination agent is expected in 2025.

In addition, we have launched a research and development program to generate new potential drug candidates

to strengthen our intellectual property portfolio on the miR-124 platform and to identify additional drug candidates

from our proprietary small molecule library that includes additional miR-124 enhancers. We expect to announce a

follow-on candidate selection in a new indication in the second half of 2025.

Results of Operations

The following table sets forth our results of operations for the three months ended March 31, 2024 and 2025.

(In thousands of euros)	Three-Month<br><br>Ended March 31,<br><br>2024	Three-Month<br><br>Ended March 31,<br><br>2025	% 2024 Change
Other operating income .........................................................	€1,186	€994	(16)%
Total operating income ..................................................................	1,186	994	(16)%
Sales and marketing expenses .................................................	(1,977)	(860)	(57)%
Research and development expenses ......................................	(35,744)	(39,301)	10%
General and administrative expenses ....................................	(8,136)	(8,033)	(1)%
Total operating expenses ...............................................................	(45,857)	(48,194)	5%
Operating loss .................................................................................	(44,671)	(47,200)	6%
Financial expenses .................................................................	(4,228)	(6,723)	59%
Financial income ....................................................................	6,031	1,552	(74)%
Financial income (loss) ..................................................................	1,803	(5,170)	(387)%
Net loss before tax ..........................................................................	(42,867)	(52,370)	22%
Income Tax .............................................................................	—	—	—%
Net loss for the period ....................................................................	€(42,867)	€(52,370)	22%

Total Operating Income

For the three months ended March 31, 2025, our total operating income was €1.0 million, as compared to

€1.2 million for the three months ended March 31, 2024, a decrease of (16)% as detailed below.

Other Operating Income

The following table sets forth our other operating income for the three months ended March 31, 2024 and

2025.

(In thousands of euros)	Three-Month<br><br>Ended March<br><br>31, 2024	Three-Month<br><br>Ended March<br><br>31, 2025	% 2024 Change
CIR (Research Tax Credits) ..............................................................	€1,150	€970	(16)%
Subsidies ...........................................................................................	25	—	(100)%
Other .................................................................................................	12	24	107%
Total other operating income ........................................................	€1,186	€994	(16)%

For the three months ended March 31, 2025, our other operating income was €1.0 million, as compared to

€1.2 million for the three months ended March 31, 2024.

Research Tax Credits

For the three months ended March 31, 2025, we recognized research tax credits for our research and

development projects of €1.0 million, as compared to €1.15 million for the three months ended March 31, 2024.

Although research and development expenses for the three months ended March 31, 2025 increased by 10% as

compared to the three months ended March 31, 2024, there was no significant variation in research tax credits during

the period due to the maximum amount of eligible outsourced research and development expenses being capped and

internal research and development costs being stable.

Total Operating Expenses

For the three months ended March 31, 2025, our total operating expenses were €48.2 million, as compared to

€45.9 million for the three months ended March 31, 2024, an increase of €2.3 million, or 5%. This increase was

primarily due to an increase in research and development expenses of €3.6 million partially offset by a decrease in

sales and marketing expenses by €1.1 million, each as described below.

Sales and Marketing Expenses

For the three months ended March 31, 2025, our total sales and marketing expenses were €0.9 million, as

compared to €2.0 million for the three months ended March 31, 2024, a decrease of €1.1 million. The decrease was

predominantly driven by a reduction in non-critical expenses to manage our cash expenses.

Research and Development Expenses

The following table sets forth our research and development expenses by drug candidate and therapeutic

indication for the three months ended March 31, 2024 and 2025.

(In thousands of euros)	Three-Month<br><br>Ended March<br><br>31, 2024	Three-Month<br><br>Ended March<br><br>31, 2025	% 2024<br><br>Change
Obefazimod ............................................................................................	€34,434	€38,736	12%
Ulcerative Colitis ...........................................................................	30,477	29,175	(4)%
Crohn’s Disease .............................................................................	406	3,394	736%
Rheumatoid Arthritis .....................................................................	2	1	(43)%
Covid-19 .......................................................................................	7	4	(51)%
Obefazimod Other Indication ........................................................	87	—	(100)%
Transversal activities .....................................................................	3,455	6,162	78%
ABX196 ..................................................................................................	4	1	(85)%
Others .....................................................................................................	1,305	564	(57)%
Research and development expenses ...................................................	€35,744	€39,301	10%

For the three months ended March 31, 2025, our research and development expenses were €39.3 million, as

compared to €35.7 million for the three months ended March 31, 2024, an increase of €3.6 million, or 10%. This

increase was primarily due to a €3.0 million increase in expenses related to our CD program, resulting from the

progression of our Phase 2b trials in CD, and a €2.7 million increase in transversal activities related to the overall

expansion of the research and development headcount to support our organizational growth and the issuance of new

equity awards to officers and employees in research and development. These were partially offset by a €1.3 million,

or 4%, decrease in expenses related to our UC clinical program.

General and Administrative Expenses

(In thousands of euros)	Three-Month<br><br>Ended March<br><br>31, 2024	Three-Month<br><br>Ended March<br><br>31, 2025	% 2024<br><br>Change
Personnel costs .....................................................................................	5,274	4,688	(11)%
Consulting and professional fees ..........................................................	1,517	1,935	28%
Other general and administrative expenses ..........................................	1,345	1,410	5%
General and administrative expenses ...............................................	8,136	8,033	(1)%

For the three months ended March 31, 2025, our general and administrative expenses were €8.0 million, as

compared to €8.1 million for the three months ended March 31, 2024, a decrease of €0.1 million, or 1%. This

decrease was primarily due to a decrease in personnel costs of €0.6 million, or 11%, mainly resulting from the

expense recognition pattern of equity awards granted to certain of our officers and employees, many of which were

issued in connection with our U.S. initial public offering and listing on Nasdaq in October 2023, as well as strict

adherence to the approved budget, which includes savings through reducing non-essential spend. These were offset

by increased legal and professional fees and other costs associated with operating as a dual-listed public company.

Operating Loss

For the three months ended March 31, 2025, our net operating loss was €47.2 million, as compared to a net

operating loss of €44.7 million for the three months ended March 31, 2024, an increase of €2.5 million, or 6%. This

increase was primarily due to an increase of €3.6 million in research and development expenses, partially offset by a

decrease of €1.1 million in sales and marketing expenses.

Financial Income (Loss)

For the three months ended March 31, 2025, our net financial loss was €5.2 million, as compared to a net

financial income of €1.8 million for the three months ended March 31, 2024.

For the three months ended March 31, 2025, our net financial loss was mainly driven by interest expenses of

€3.5 million in relation to the first tranche of senior secured convertible bonds with warrants attached in the Kreos /

Claret Financing (the “Kreos / Claret OCABSA”), the second and third tranches of the senior secured bonds in the

Kreos / Claret Financing (drawn on March 28, 2024 and June 21, 2024 respectively) and the senior convertible notes

in the Heights Financing (the "Heights Convertible Notes"), non-cash expense of €1.0 million in relation to our

royalty certificates and foreign exchange losses of €1.0 million (including the €0.4 million non-cash impact of the

revaluation of U.S. dollar-denominated cash and cash equivalents as of March 31, 2025). These costs were partially

offset mainly by interest income of €0.9 million in relation to the invested proceeds from our U.S. initial public

offering and listing on Nasdaq.

For the three months ended March 31, 2024, our net financial income was mainly driven by an interest income

of €2.5 million in relation to the invested proceeds from our U.S. initial public offering and listing on Nasdaq, a

decrease in the fair value of the senior convertible notes in the Heights Financing (the "Heights Convertible Notes")

of €1.6 million and foreign exchange gains of €1.6 million (including the €1.0 million non-cash impact of the

revaluation of U.S. dollar-denominated cash and cash equivalents as of March 31, 2024). This income was mainly

offset by interest expenses of €1.5 million in relation to the first tranche of senior secured convertible bonds with

warrants attached in the Kreos / Claret Financing (the “Kreos / Claret OCABSA”) and Heights Convertible Notes,

non-cash expense of €0.9 million in relation to our royalty certificates, a €1.2 million increase in the fair value of

derivatives and transaction costs amounting to €0.6 million.

Income Taxes

For each of the three months ended March 31, 2025 and 2024, our income tax charge was zero.

Net Loss

For the three months ended March 31, 2025, our net loss for the period was €52.4 million, as compared to

€42.9 million for the three months ended March 31, 2024, an increase of €9.5 million, or 22%.

Liquidity and Capital Resources

Sources of Liquidity

We have incurred substantial operating losses since inception and expect to continue to incur significant

operating losses for the foreseeable future and may never become profitable. For the three month period ended

March 31, 2024 and 2025, we reported net losses of €42.9 million and €52.4 million, respectively. As of December

31, 2024, we carried forward accumulated tax losses of €609.4 million.

Since inception, we have financed our operations through the issuance of ordinary shares with gross aggregate

proceeds of €557.2 million, of which €130.0 million of gross proceeds were from offerings of our ordinary shares on

Euronext Paris in February 2023, €223.3 million of gross proceeds were from offering of our ordinary shares in the

form of ADS on the Nasdaq Global Market in our U.S. initial public offering as well as ordinary shares in Europe

(including France) and countries outside of the United States in a private placement in October 2023, bank

borrowings and structured loans for €175.0 million, reimbursements of CIR in an amount of €31.1 million, subsidies

received from Bpifrance (including €17.1 million of subsidies and €1.8 million of conditional advances) and royalty

certificates in an amount of €2.9 million.

Based on (a) our existing cash and cash equivalents of €103.6 million as of March 31, 2025, and (b) the

expected reimbursement of the CIR from 2024 in the second half of 2025 amounting to €5.7 million, we expect, as

of the date of issuance of the unaudited interim condensed consolidated financial statements included in this

quarterly report, to be able to fund our forecasted cash flow requirements into the fourth quarter of 2025. Our

forecasted cash flow requirements take into account our assumption of substantially higher R&D expenditure in

2025 driven by the progression of the Phase 3 clinical trials of obefazimod in UC and the Phase 2b clinical trials for

CD. Under these assumptions and based on our current clinical and operational plans, we would have sufficient

funds to finance our operations through the announcement of our top-line data from the Phase 3 ABTECT-1 and

ABTECT-2 induction trials for UC expected in the third quarter of 2025.

We expect we will be able to extend our financing horizon beyond the fourth quarter of 2025 through

additional dilutive and non-dilutive financing, which could include a combination of capital increase, out-licensing

agreements, venture loans and convertible bonds.

On November 19, 2024, we filed a registration statement on Form F-3 with the SEC, which covers the

offering, issuance and sale, from time to time at prices and on terms to be determined at or prior to the time of the

offering, of up to $350.0 million of our ordinary shares, including ordinary shares represented by ADSs, as well

warrants to purchase ordinary shares or ADSs, individually or in any combination, of which $150.0 million may be

issued pursuant to our ATM Program (as defined below). Also on November 19, 2024, we entered into an equity

distribution agreement with Piper Sandler & Co. (“Piper Sandler”) allowing us to issue and sell from time to time, in

one or more "at the market" offerings through Piper Sandler acting as sales agent, ordinary shares in the form of

ADSs, each ADS representing one ordinary share, nominal value of €0.01 per share, with aggregate gross sales

proceeds of up to $150.0 million (the "ATM Program"). As of March 31, 2025, we have not sold any ADSs pursuant

to the ATM Program.

Based on the above, management has concluded that these factors raise substantial doubt about our ability to

continue as a going concern for a period of 12 months from the date of issuance of the financial statements

accompanying this quarterly report.

Capital Increases

During the three-month period ending March 31, 2025, there has been one capital increase relating to the

vesting of 70,912 AGAs, resulting in the issuance of 70,912 ordinary shares with a par value of €0.01 per share.

Research Tax Credits

From our inception to March 31, 2025, we have benefited from refunds of CIRs in a total amount of

€35.6 million. In November 2024, we received CIRs of €4.5 million with respect to the year ended December 31,

We anticipate to receive CIRs of €5.7 million with respect to the year ended December 31, 2024 in the second

half of 2025.

Bpifrance—Conditional Advances and Subsidies

We have received several conditional advances and subsidies from Bpifrance since our inception. Funds

received from Bpifrance in the form of conditional advances are recognized as financial liabilities, as we have a

contractual obligation to reimburse Bpifrance for such conditional advances in cash based on a repayment schedule.

Each award of an advance is made to help fund a specific development milestone. Subsidies are non-repayable

grants, which are recognized in the financial statements when there exists reasonable assurance that we will comply

with the conditions attached to the subsidies and the subsidies will be received.

Bpifrance—CARENA Contract

As part of the development of therapeutic and diagnostic solutions targeting alternative splicing and RNA

interference in the fields of virology (HIV-AIDS, HTLV-1) and metabolism (obesity), SPLICOS, which we acquired

in October 2014, entered into a Master Support Agreement and a conditional advance contract in December 2013 for

the “CARENA” Strategic Industrial Innovation Project (“CARENA project”), with Bpifrance. Under this contract,

we were eligible to receive up to €3.8 million in conditional advances to develop a therapeutic HIV treatment

program with obefazimod. As of March 31, 2025, we had received €3.4 million of conditional advances and

subsidies.

In June 2024, the Company and Bpifrance agreed to terminate the project due to technical failure.

Bpifrance granted an additional amount of €1.1 million payable to the Company to reimburse additional expenses

incurred as part of the project, and agreed to waive 60% of the remaining conditional advance of €3.3 million and

accrued interests, for which we recognized a subsidy income of €2.3 million in the aggregate. We repaid the

outstanding amounts during the second half of 2024.

Bpifrance—RNP-VIR Contract

As part of the CARENA project, focused on the clinical development of a drug molecule and demonstrating

the validity of an innovative therapeutic approach targeting viral RNPs, we entered into a Master Support

Agreement with Bpifrance, as well as a beneficiary agreement dated March 21, 2017, with conditional advances for

the “RNP-VIR” structuring research and development project for competitiveness. Under the RNP-VIR contract, we

were eligible to receive up to €6.3 million in conditional advances to develop methods for the discovery of new

molecules for the treatment of viral infectious diseases through the development of the “Modulation of RNA

biogenesis” platform. As of March 31, 2025, we had received €3.9 million of conditional advances and subsidies.

In June 2024, the Company and Bpifrance agreed to terminate the project due to technical failure.

Bpifrance claimed the reimbursement of €1.2 million corresponding to overpayments of conditional advances and

subsidies (for which the Group had not incurred the corresponding R&D expenses) and agreed to waive 60% of the

remaining advances of €3.0 million and accrued interests, for which the we recognized a subsidy income of €1.9

million in the aggregate. We repaid the outstanding amounts during the second half of 2024.

Bpifrance—Ebola

The Bpifrance and Occitanie Region joint support agreement was entered into on June 2, 2017 and provides

for conditional advances for a total amount of €0.4 million (€0.1 million from the Languedoc Roussillon Midi

Pyrénées Region and €0.3 million from Bpifrance) for the Ebola program. All funds under this contract were

received. In September 2019, we terminated this program due to the imminent licensing of a competing vaccine for

this indication, as well as changes in the macroeconomic climate for public funding. The reimbursement of the

conditional advance was spread over the period from September 2019 to June 2024.

Indebtedness

For a description of material financing agreements, see "Item 10.C. Material Contracts" of the Company’s

2024 Annual Report on Form 20-F.

During the three month period ending March 31, 2025, we did not enter into any new financing agreements.

Historical Changes in Cash Flows

The following table sets forth our cash inflows and outflows for the three months ended March 31, 2024 and

2025.

(In thousands of euros)	Three-Month<br><br>Ended March 31,<br><br>2024	Three-Month<br><br>Ended March 31,<br><br>2025	% 2024<br><br>Change
Net cash flows used in operating activities ............................................	(34,754)	(33,278)	(4)%
Net cash flows provided by investing activities ...................................	1,901	1,082	(43)%
Net cash flows provided by (used in) financing activities .....................	21,201	(7,837)	(137)%
Effect of movements in exchange rates on cash held ............................	1,319	(700)	(153)%
Revaluation of cash equivalents measured at fair value ........................	—	88	100%
Net increase (decrease) in cash and cash equivalents .....................	(10,334)	(40,646)	293%
		144,221
Cash and cash equivalents at the beginning of the period ...............	251,942	144,221	(43)%
Cash and cash equivalents at the end of the period ..........................	241,608	103,576	(57)%

Operating Activities

For the three months ended March 31, 2025, cash used in operating activities was €(33.3) million, as

compared to €(34.8) million for the three months ended March 31, 2024, a decrease of (1.5) million, or (4)%. Net

cash used in both periods was predominantly related to payments for the progression of our UC and CD trials,

personnel, legal, professional and infrastructure costs associated with operating as a dual-listed public company.

Investing Activities

For the three months ended March 31, 2025, cash provided by investing activities was €1.1 million and was

mainly due to interest received of €1.0 million.

For three months ended March 31, 2024, cash provided by investing activities was €1.9 million and was

mainly composed of interest received of €2.5 million payments, partially offset by the payment of deposits of €0.5

million related to the drawdown on tranche B of the senior secured non-convertible bonds from the Kreos / Claret

Financing.

Financing Activities

For the three months ended March 31, 2025, cash used in financing activities was €(7.8) million, which

consisted of repayments of €6.1 million (of which €3.7 million under the tranches B and C of the Kreos / Claret

Financing and €2.2 million under the Heights convertible notes) and interest payments of €2.0 million.

For the three months ended March 31, 2024, cash provided by financing activities was €21.2 million which

consisted of the drawdown on tranche B (in an amount of €25 million) of the senior secured non-convertible bonds

from the Kreos / Claret Financing, net of disbursed transaction costs (in an amount of €0.4 million), partially offset

by repayments of €2.4 million (of which €2.2 million under the Heights convertible notes) and interest payments of

€1.1 million.

Material Cash Requirements

Contractual Obligations and Loans

The following table sets forth aggregate information about material contractual obligations as of March 31,

2025.

The commitment amounts in the table below are associated with contracts that are enforceable and legally

binding and that specify all significant terms, including fixed or minimum services to be used, fixed, minimum or

variable price provisions, and the approximate timing of the actions under the contracts. Future events could cause

actual payments to differ from these estimates. All amounts except the retirement benefits in the table below are

presented gross and are undiscounted.

	As of March 31, 2025	As of March 31, 2025	As of March 31, 2025
	Less than	More than
(In thousands of euros)	1 year	1 year	Total
Financial debt obligations ..........................	38,994	70,452	109,446
Lease obligations .......................................	995	1,270	2,264
Retirements benefits ..................................	0	759	759
Off-balance sheet obligations ....................	220,526	0	220,526
Total ..........................................................	260,514	72,481	332,995

In the ordinary course of our business, we regularly use the services of subcontractors and enter into research

and partnership arrangements with various CROs and with public-sector partners or subcontractors who conduct

clinical trials and studies in relation to the drug candidates. Off-balance sheet obligations in the table above are

commitments related to these research and partnership agreements. They are classified at less than one year maturity

in the absence of a fixed schedule in contracts, in case of multiple-year contracts, such as CRO contracts. CRO

contracts include payments that are conditional to the completion of future development milestones. The majority of

the commitments with our CROs are cancellable under certain circumstances such as insolvency, study put on hold

by competent authorities, breach in regulations or negligence in the provision of the services.

Our material cash requirements in the above table do not include potential future royalty payments related to

the royalty certificates, amounting to 2% of the future net sales of obefazimod (worldwide and for all indications).

The amount of royalties that may be paid under the royalty certificates is capped at €172.0 million in the aggregate.

Royalty payments are expected to take place before the expiry date of the certificates, which is 15 years after their

issuance date (September 2, 2037).

As of March 31, 2025, our contractual obligations and loans were

€333.0

million, comprising financial debt

obligations of

€109.4

million (in turn, comprising €53.1 million with respect to the second and third tranches of

senior secured non-convertible bonds in the Kreos / Claret Financing, €23.7 million with respect to Heights

Convertible Notes, €30.1 million with respect of the Kreos / Claret OCABSA and €2.6 million with respect to the

PGE) and off-balance sheet obligations of

€220.5

million with respect to purchase obligations.

F-1

INDEX TO UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Condensed Consolidated Statements of Financial Position ...............................................................	F-2
Condensed Consolidated Statements of Loss ....................................................................................	F-3
Condensed Consolidated Statements of Comprehensive Loss ..........................................................	F-4
Condensed Consolidated Statements of Changes in Shareholders’ Equity .......................................	F-5
Condensed Consolidated Statements of Cash Flows .........................................................................	F-6
Notes to the Condensed Consolidated Financial Statements .............................................................	F-7

F-2

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

(Amounts in thousands of euros)	Notes	AS OF<br><br>DECEMBER 31,<br><br>2024	AS OF<br><br>MARCH 31, 2025
ASSETS
Non-current assets
Goodwill	6	18,419	18,419
Intangible assets	7	6,606	6,606
Property, plant and equipment	8	2,666	2,410
Other financial assets	9	5,919	5,979
Other assets	10	948	858
Total non-current assets		34,558	34,273
Current assets
Other financial assets	9	7,554	7,528
Other receivables and assets	10	18,896	21,563
Cash and cash equivalents	11	144,221	103,576
Total current assets		170,671	132,667
TOTAL ASSETS		205,228	166,939
LIABILITIES AND SHAREHOLDERS' EQUITY
Shareholders’ equity
Share capital		633	634
Premiums related to share capital		478,905	479,154
Translation reserves		(75)	136
Retained earnings		(262,637)	(434,147)
Net loss for the period		(176,242)	(52,370)
Total shareholders’ equity	13	40,584	(6,592)
Non-current liabilities
Retirement benefit obligations	16	756	759
Provisions	14	819	1,038
Borrowings	15	29,056	24,373
Convertible loan notes	15	23,370	23,819
Derivative instruments	15	3,620	3,795
Royalty certificates	15	13,023	14,006
Total non-current liabilities		70,645	67,790
Current liabilities
Borrowings	15	22,195	24,091
Convertible loan notes	15	21,574	20,273
Derivative instruments	15	1,166	1,021
Provisions	14	532	765
Trade payables and other current liabilities	17.1	43,824	56,525
Tax and employee-related payables	17.2	4,709	3,065
Total current liabilities		93,999	105,741
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY		205,228	166,939

F-3

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF LOSS

(Amounts in thousands of euros, except per share amounts)	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
Other operating income	1,186	994
Total operating income	1,186	994
Sales and marketing	(1,977)	(860)
Research and development	(35,744)	(39,301)
General and administrative	(8,136)	(8,033)
Total operating expenses	(45,857)	(48,194)
Operating loss	(44,671)	(47,200)
Financial expenses	(4,228)	(6,723)
Financial income	6,031	1,552
Financial gain (loss)	1,803	(5,170)
Net loss before tax	(42,867)	(52,370)
Income tax	—	—
Net loss for the period	(42,867)	(52,370)
Loss per share (/share)
Weighted average number of outstanding shares used for computing basic/diluted loss per share	62,917,553	63,378,911
Basic / diluted loss per share (/share)	(0.68)	(0.83)

All values are in Euros.

F-4

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE

LOSS

(Amounts in thousands of euros)	Notes	FOR THE<br><br>THREE<br><br>MONTHS<br><br>ENDED<br><br>MARCH 31,<br><br>2024	FOR THE<br><br>THREE<br><br>MONTHS<br><br>ENDED<br><br>MARCH 31,<br><br>2025
Net loss for the period		(42,867)	(52,370)
Items that will not be reclassified to profit or loss		9	40
Actuarial gains on retirement benefit obligations	16	9	40
Items that are or may be reclassified subsequently to profit or loss		(38)	211
Foreign currency translation differences		(38)	211
Other comprehensive (loss) income		(29)	250
Total comprehensive loss for the period		(42,896)	(52,119)

F-5

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

(Amounts in thousands of euros)	Notes	NUMBER OF<br><br>SHARES<br><br>ISSUED	SHARE<br><br>CAPITAL	PREMIUMS<br><br>RELATED TO<br><br>SHARE<br><br>CAPITAL	TRANSLATION<br><br>RESERVE	RETAINED<br><br>EARNINGS	NET LOSS<br><br>FOR THE<br><br>YEAR	TOTAL<br><br>SHAREHOLDER<br><br>'S EQUITY
AS OF<br><br>JANUARY 1, 2024		62,928,818	629	478,218	112	(135,210)	(147,740)	196,009
Net loss for the period		—	—	—		—	(42,867)	(42,867)
Other comprehensive income	16	—	—	—	(38)	9	—	(29)
Total comprehensive loss for the period		—	—	—	(38)	9	(42,867)	(42,896)
Appropriation of prior period net loss		—	—	—		(147,740)	147,740	—
Shares based compensation expense	14	—	—	—	—	5,755	—	5,755
Transactions on treasury shares	13.1	—	—	—	—	3	—	3
AS OF<br><br>MARCH 31, 2024		62,928,818	629	478,218	75	(277,184)	(42,867)	158,872
AS OF<br><br>DECEMBER 31, 2024		63,347,837	633	478,905	(75)	(262,637)	(176,242)	40,584
Net loss for the period		—	—	—		—	(52,370)	(52,370)
Other comprehensive income	16	—	—	—	211	40	—	250
Total comprehensive loss for the period		—	—	—	211	40	(52,370)	(52,119)
Appropriation of prior period net loss		—	—	—		(176,242)	176,242	—
Issue of share warrants	14	—	—	250	—	—	—	250
Issue of free shares	14	70,912	1	(1)	—	—	—	—
Shares based compensation expense	14	—	—	—	—	4,692	—	4,692
AS OF<br><br>MARCH 31, 2025		63,418,749	634	479,155	136	(434,147)	(52,370)	(6,592)

F-6

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Amounts in thousands of euros)	Notes	FOR THE<br><br>THREE<br><br>MONTHS<br><br>ENDED<br><br>MARCH 31, 2024	FOR THE<br><br>THREE<br><br>MONTHS<br><br>ENDED<br><br>MARCH 31, 2025
Cash flows used in operating activities
Net loss for the period		(42,867)	(52,370)
Adjustments for:
Elimination of amortization of intangibles and depreciation of property, plant and equipment		211	273
Elimination of retirement benefit obligations	16	30	36
Elimination of share-based compensation expenses	14	5,755	4,689
(-) Net gain on sale of treasury shares		(6)	—
Interest expenses and other financial expenses	21	3,044	5,318
Financial income	21	(4,276)	(1,026)
Effect of unwinding the discount related to advances	9	(182)	(233)
Decrease in derivatives and liabilities fair value	15	(384)	1,081
Other		—	(58)
Cash flows used in operating activities before change in working capital requirements		(38,675)	(42,289)
Decrease (increase) in other receivables and other assets		(677)	(2,161)
Increase (decrease) in trade payables		5,199	12,754
Increase (decrease) in tax and social security liabilities		(576)	(1,608)
Increase (decrease) in deferred income and other liabilities		(25)	26
Changes in working capital requirements		3,921	9,011
Cash flows used in operating activities		(34,754)	(33,278)
Cash flows used in investing activities
Acquisitions of property, plant and equipment	8	(12)	(44)
Advances reimbursed by (made to) CROs	10	—	18
Increase in Deposits and other financial assets	9	(542)	(6)
Decrease in Deposits	9	—	130
Interest received	21	2,454	984
Cash flows provided by investing activities		1,901	1,082
Cash flows provided by financing activities
Net proceeds from non-convertible bond loans	15	24,625	—
Repayments of non-convertible bond loans	15	—	(3,705)
Repayments of convertible loan notes	15	(2,188)	(2,188)
Repayments of conditional advances	15	(28)	—
Payments of the lease liabilities	15	(143)	(230)
Interest paid	15	(1,070)	(1,965)
Other		3	250
Cash flows provided by (used in) financing activities		21,201	(7,837)
Effect of movements in exchange rates on cash held	11	1,319	(700)
Revaluation of cash equivalents measured at fair value	11	—	88
Decrease in cash and cash equivalents		(10,334)	(40,646)
Cash and cash equivalents at the beginning of the period	11	251,942	144,221
Cash and cash equivalents at the end of the period	11	241,608	103,576
Decrease in cash and cash equivalents		(10,334)	(40,646)

F-7

ABIVAX SA NOTES TO THE UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Note 1. The Group

Note 1.1. Information on the Group and its business

ABIVAX SA (the “Company”) is a société anonyme incorporated under the laws of France on December 4, 2013. Its registered office

is located at 7-11 Boulevard Haussmann—75009 Paris, France. The Company is developing therapeutics designed to harness the

body’s natural regulatory mechanisms to stabilize the immune response in patients with chronic inflammatory diseases.

These unaudited interim condensed consolidated financial statements as of and for the three months ended March 31, 2025 comprise

the Company and ABIVAX LLC (the “Subsidiary”), the United States subsidiary of ABIVAX SA, created on March 20, 2023 under

the laws of the State of Delaware (together referred to as the “Group”).

The Group has incurred losses since its inception and had shareholders’ equity of €(6,592) thousand as of March 31, 2025. The Group

anticipates incurring additional losses until such time, if ever, that it can generate significant revenue from its drug candidates which

are currently under development. Substantial additional financing will be needed by the Group to fund its operations and to

commercially develop its drug candidates, if approved.

The Group's future operations are highly dependent on a combination of factors, including: (i) the success of its research and

development activities; (ii) regulatory approval and market acceptance of its proposed future products; (iii) the timely and successful

completion of additional financing and (iv) the development of competitive therapies by other biotechnology and pharmaceutical

companies. As a result, the Group is, and expects to continue to be, in the short to mid-term, financed through the issuance of new

equity or debt instruments.

The Group is focusing its efforts on the following points:

•Continuation of the Phase 3 clinical trial program (ABTECT) for obefazimod in moderately to severely active ulcerative

colitis (“UC”).

•Initiating the Phase 2b clinical trial (ENHANCE-CD) of obefazimod in Crohn’s disease (“CD”).

•Evaluating oral or injectable combination therapy candidates with obefazimod in UC.

•Selecting a follow-on candidate for obefazimod.

Note 1.2. Date of authorization of issuance

The unaudited interim condensed consolidated financial statements and related notes have been prepared under the responsibility of

management of the Group and were approved and authorized for issuance by the Group’s board of directors on May 28, 2025.

Note 2. Basis of preparation

Except for share data and per share amounts, the unaudited interim condensed consolidated financial statements are presented in

thousands of euros. Amounts are rounded up or down the nearest whole number for the calculation of certain financial data and other

information contained in these accounts. Accordingly, the total amounts presented in certain tables may not be the exact sum of the

preceding figures.

F-8

Statement of compliance

These unaudited interim condensed consolidated financial statements as of March 31, 2025 and for the three-month periods ended

March 31, 2025 and 2024 have been prepared in accordance with IAS 34 “Interim Financial Reporting” as issued by IASB and as

adopted by the European Union (EU) and should be read in conjunction with the latest Group’s annual financial statements for the

years ended December 31, 2022, 2023 and 2024, prepared in accordance with IFRS as issued by IASB and as adopted by the EU.

They do not include all the information required for a complete set of financial statements prepared under IFRS. They do, however,

include selected notes explaining significant events and transactions in order to understand the changes in the Group’s financial

position and performance since the last annual financial statements.

The accounting policies used to prepare these unaudited interim condensed financial statements are identical to those applied by the

Group as of December 31, 2024, except for:

•the texts whose application is compulsory as from January 1, 2025;

•the specific provisions of IAS 34 used in the preparation of the unaudited interim condensed consolidated financial

statements.

The application of the new Amendments to IAS 21 "The Effects of Changes in Foreign Exchange Rates – Lack of Exchangeability" is

mandatory for annual reporting periods beginning on or after January 1, 2025.The Group assessed the impacts resulting from the

application of these issued accounting pronouncements and concluded that impacts are not material.

The standards and interpretations not yet mandatory as of March 31, 2025 are the following:

•Amendments to IFRS 9 Financial Instruments and IFRS 7 Financial Instruments: Disclosures – Amendments to the

Classification and Measurement of Financial Instruments, whose application is for annual reporting periods beginning on or

after January 1, 2026 (not yet approved by the EU);

•Amendments to IFRS 9 Financial Instruments and IFRS 7 Financial Instruments: Disclosures – Contracts Referencing

Nature-dependent Electricity, whose application is for annual reporting periods beginning on or after January 1, 2026 (not yet

approved by the EU);

•IFRS 18 Presentation and Disclosure in Financial Statements, whose application is for annual reporting periods beginning on

or after January 1, 2027 (not yet approved by the EU);

•IFRS 19 Subsidiaries without Public Accountability: Disclosures, whose application is for annual reporting periods beginning

on or after January 1, 2027 (not yet approved by the UE), and

•Annual Improvements Volume 11, whose application is for annual reporting periods beginning on or after January 1, 2026

(not yet approved by the UE).

These texts have not been early adopted. The expected impacts are not considered significant, except for IFRS 18, for which the Group

has not completed its assessment to date.

Preparation of the financial statements

The unaudited interim condensed consolidated financial statements of the Group were prepared on a historical cost basis, with the

exception of certain asset and liability categories and in accordance with the provisions set out in IFRS such as employee benefits

measured using the projected unit credit method, the Heights notes (classified under "Convertible loan notes") measured at fair value

and derivative financial instruments measured at fair value.

Going concern

The Group has incurred substantial operating losses since inception and expects to continue to incur significant operating losses for the

foreseeable future and may never become profitable. For the three-month period ended March 31, 2025, the Group had a net loss of

€52,370 thousand. In addition, the Group had negative shareholder's equity of €(6.6) million as at March 31, 2025 driven by the losses

incurred.

F-9

Since inception, the Group has financed its operations through the issuance of ordinary shares with gross aggregate proceeds of

€557.2 million, of which €130 million of gross proceeds were from offerings of its ordinary shares on Euronext Paris in February 2023

and €223.3 million of gross proceeds were from its offering of ordinary shares in the form of American Depository Shares ("ADS") on

the Nasdaq Global Market as well as ordinary shares in Europe (including France) and countries outside of the United States in a

private placement in October 2023, bank borrowings and structured loans for €175.0 million, reimbursements of Research Tax Credits

(Crédit d’Impôt Recherche (“CIR”)) in an aggregate amount of €35.6 million, subsidies received from Banque Publique

d’Investissement (“Bpifrance”) (including €17.1 million of subsidies and €1.8 million of conditional advances) and royalty certificates

in an amount of €2.9 million.

Based on (a) the Group’s existing cash and cash equivalents of €103.6 million as of March 31, 2025 and (b) the expected

reimbursement of the CIR from 2024 in the second half of 2025 amounting to €5.7 million, the Group expects, as of the date of

issuance of these financial statements, to be able to fund its forecasted cash flow requirements into the fourth quarter of 2025. This

takes into account management's assumptions of higher R&D expenditure in 2025 driven by the progression of the Phase 3 clinical

trials of obefazimod in UC and the Phase 2b clinical trials for CD. Under these assumptions and based on the Group's current clinical

and operational plans, the Group would have sufficient funds to finance its operations in the fourth quarter of 2025, i.e. through the

announcement of its top-line data from the Phase 3 ABTECT-1 and ABTECT-2 induction trials for UC expected in the third quarter of

2025.

The elements referred to above, as well as (c) the Group's expectation to generate operating losses and negative operating cash flows

in the future, and (d) the need for additional funding to support its planned operations, result in a material uncertainty that may cast

significant doubt (or raise substantial doubt as contemplated by Public Company Accounting Oversight Board standards) regarding its

ability to continue as a going concern for a period of one year after the date that these consolidated financial statements are issued. The

Group continues to monitor its spending of 2025 expenses, ensuring strict adherence to the approved budget, which includes projected

savings through the gating of non essential spend and to pursue additional cash resources through public or private equity or debt

financings, regional out licensing agreements and/or royalty financing. The Group has concluded that substantial doubt exists about

the Group’s ability to continue as a going concern for a period of at least 12 months from the date of issuance of these consolidated

financial statements.

The accompanying financial statements have been prepared on a going concern basis, which contemplates the realization of assets and

satisfaction of liabilities in the ordinary course of business. The 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 may be necessary if the

Group is unable to continue as a going concern.

Impact of the Ukraine/Russia Hostilities on the Group

In February 2022, Russia invaded Ukraine. The conflict has already had major implications for the global economy and the rate of

inflation, particularly in relation to the supply of energy, raw materials and food products. It has also caused intense volatility on the

financial markets, something that is still ongoing at the reporting date and has pushed down stock market prices around the world.

Given these developments, the Group has decided not to include Russia and Belarus in its global Phase 3 program for obefazimod in

UC. However, the global scale of this conflict cannot be predicted at this stage. The Group, therefore, cannot rule out an adverse

impact of this conflict on its business, including in terms of access to raw materials, logistics, the performance of clinical studies and

in relation to any future financing the Group may seek.

The long-term safety and efficacy extension of the Phase 2b maintenance trial of obefazimod in moderately to severely active UC is

the Group’s only clinical trial with patients currently enrolled in Ukraine. The Phase 2b 12-month assessment was carried out in all the

Ukrainian patients before the war broke out and these patients are therefore included in the one-year maintenance results that were

reported on April 6, 2022. Ukrainian patients who completed the two-year Phase 2b maintenance trial have been transitioned to the

long-term safety and efficacy trial that is still on-going. The Group also has a few Ukrainian sites active in the western part of Ukraine

in the ABTECT Phase 3 clinical trials. None of these sites are located in the Crimea Region of Ukraine, the so-called Donetsk

People’s Republic, or the so-called Luhansk People’s Republic. The Group continues to monitor developments in the region, but any

instability as a result of the war may have material adverse impacts on these clinical sites, which could negatively impact our Phase 3

clinical trials.

F-10

Together with its CROs, the Group is making considerable efforts to ensure the follow-up of patients who are unable to come to the

study centers. Monitoring takes place through a remote monitoring system that was established and used successfully during the

COVID-19 pandemic.

Note 3. Significant events for the year ended December 31, 2024 and the three months ended March 31, 2025 and subsequent

events

F-11

Note 3.1. For the year ended December 31, 2024

Changes in management – February-December 2024

On February 7, 2024, the Group announced the appointment of Ana Sharma as Vice President, Global Head of Quality. Ms. Sharma

left the Group in November 2024.

On April 2, 2024, the Group announced the appointment of Camilla Soenderby as Independent Board Member and also a member of

the Appointments and Compensation Committee. Ms. Soenderby replaces Santé Holdings S.R.L., represented by Mr. Paolo Rampulla,

who will continue to contribute to the work of the Board of Directors as an observer alongside Mr. Maurizio PetitBon from Kreos

Capital/Blackrock.

In July 2024, the Group announced the appointment of Sylvie Grégoire as Independent Board Member, Chairman of the Board and

also a member of the Audit Committee. Ms. Grégoire replaces Ms. Brosgart as Director, Mr. de Garidel as Chairman, and Mr. Hong as

member of the Audit Committee.

As the Group entered into the final stages of the ABTECT program and prepared to commence the Phase 2b ENHANCE-CD trial, Dr.

Fabio Cataldi was appointed as Chief Medical Officer, taking over from Dr. Sheldon Sloan, MD, M Bioethics.

Additionally, David Zhang, Ph.D joined the Group as Chief Strategy Officer. Dr. Zhang has internal responsibility for Biometrics,

Quality, HEOR and Regulatory.

Finally, the Group also announced that Chief Commercial Officer Michael Ferguson has left the organization to pursue other

opportunities.

On November 13, 2024, the Group announced the appointment of Mark Stenhouse as Board Observer & Advisor to the Group.

On December 23, 2024, the Group announced the resignation of Dr. Philippe Pouletty, representative of Truffle Capital, as director of

the Group, effective on December 31, 2024.

Share-based compensation plans – February-September 2024

In February, March, May, July and September 2024, the Group issued seven free-share compensation plans to certain of its officers

and employees, representing a maximum of 1,946,125 shares in the aggregate, the vesting of which is subject to the following service

condition: 50% of the AGAs vest at the end of a two-year period from the allocation date, 25% at the end of a three-year period from

the allocation date and 25% at the end of a four-year period from the allocation date (with the exception of the 20,000 2024-6 AGAs,

whose vesting conditions are set forth in Note 14).

In March 2024, the Group granted its independent Board members the right to subscribe up to

77,820

share warrants (BSA) in the

aggregate, the vesting of which is subject to a service condition of four years, by tranches of 25% each, vested on each anniversary

date. All the BSAs have been subscribed.

The detailed terms and conditions and the accounting treatment of these plans are presented in Note 14 to the annual consolidated

financial statements of the Group as of December 31, 2024 accompanying the Group’s annual report on Form 20-F for the year ended

December 31, 2024 filed with the Securities and Exchange Commission on March 24, 2025 (the “Annual Report”).

Drawdown of Tranches B and C of the Kreos / Claret Financing – March-June 2024

On March 28, 2024 and June 21, 2024, the Group drew down €25 million related to tranche B and €25 million related to tranche C of

senior secured non-convertible bonds from the Kreos / Claret Financing. These second and third tranches each consist of 25,000,000

senior secured non-convertible bonds with a par value of €1.00 each, that will not be listed on any market.

The detailed characteristics of these bond loans and their accounting treatments are set forth in Note 15.1 to the annual consolidated

financial statements of the Group as of December 31, 2024 accompanying the Group’s Annual Report.

Bpifrance RNP-VIR and Carena conditional advances – June 2024

F-12

In June 2024, the Group and Bpifrance renegotiated the RNP-VIR and CARENA conditional advances:

•Under the RNP-VIR contract, the Group was eligible to receive up to €6.3 million in conditional advances to further develop

methods for the discovery of new molecules for the treatment of viral infectious diseases through the development of the

“Modulation of RNA biogenesis” platform. Between September 2017 and November 2019, the Group had received repayable

conditional advances amounting €4,032 thousands and subsidies amounting to €1,123 thousand in relation to the RNP-VIR

project.

In June 2024, the Group and Bpifrance agreed to terminate the project due to technical failure. Bpifrance claimed the

reimbursement of €1,241 thousand corresponding to overpayments of conditional advances and subsidies (for which the

Group had not incurred the corresponding R&D expenses) and agreed to waive 60% of the remaining advances of

€2,945 thousand and accrued interests, which resulted in a subsidy income of €1,872 thousand in the aggregate (see Note 18).

The outstanding amount was fully repaid by the Group during the last quarter of 2024.

•Under the CARENA agreement, the Group was eligible to receive up to €3,840 thousand to develop a therapeutic HIV

treatment program with ABX464. Between December 2013 and June 2016, the Group had received repayable conditional

advances amounting €2,187.

In June 2024, the Group and Bpifrance agreed to terminate the project due to technical failure. Bpifrance granted an

additional amount of €1,068 thousand payable to the Group to reimburse additional expenses incurred as part of the project,

and agreed to waive 60% of the remaining conditional advance of €3,255 thousand and accrued interests, which resulted in a

subsidy income of €2,251 thousand in the aggregate (see Note 18). The outstanding amount was fully repaid by the Group

during the last quarter of 2024.

Establishment of an At-the-Market ("ATM") Program on Nasdaq - November 2024

On November 19, 2024, the Group announced the implementation of an At-The-Market program (“ATM Program”) allowing the

Group to issue and sell, including with unsolicited investors who have expressed an interest, ordinary shares in the form of ADSs,

each ADS representing one ordinary share, nominal value €0.01 per share, of the Group, with aggregate gross sales proceeds of up to

$150,000 thousand (subject to French regulatory limits and within the limits of the investors’ requests expressed in the context of the

program), from time to time, pursuant to the terms of an equity distribution agreement with Piper Sandler & Co. (“Piper Sandler”),

acting as sales agent. The timing of any issuances in the form of ADSs will depend on a variety of factors. The ATM Program will be

effective until terminated in accordance with the equity distribution agreement or if ADSs representing the maximum gross sales

proceeds have been sold thereunder. To the extent that ADSs are sold pursuant to the ATM Program, the Group currently intends to

use the net proceeds (after deduction of fees and expenses), if any, of sales of ADSs issued under the ATM Program primarily to fund

the research and development of the Group's product candidates, for working capital and general corporate purposes, at its discretion.

A shelf registration statement on Form F-3, including a base prospectus relating to the Group's securities and an equity distribution

agreement prospectus relating to the ATM Program, was filed with the SEC and went into effect during 2024. The base prospectus

provides for the potential sale of ADSs of the Group with aggregate gross sales proceeds of up to $350,000 thousand (including the

$150,000 thousand covered by the equity distribution agreement prospectus) to grant additional flexibility to the Group in connection

with its financing strategy. The specific terms of any securities to be offered pursuant to the base prospectus will be specified in one or

more prospectus supplements to the base prospectus. As of the date of issuance of our Annual Report, the Group has not utilized the

ATM Program.

Note 3.2. For the three-month period ended March 31, 2025

F-13

Share-based compensation plans – January-March 2025

In January 2025, the Group granted its independent Board members, as well as one of its Board Observers and Advisor, the right to

subscribe up to 125,000 share warrants (BSA) in the aggregate, the vesting of which (if subscribed) is subject to a service condition of

four years, by tranches of 25% each, vested on January, 1 of each year.

In February and March 2025, the Group issued five free-share compensation plans to certain of its officers and employees,

representing a maximum of 4,540,727 shares in the aggregate, the vesting of which is subject to the following service condition: 50%

of the AGAs vest at the end of a two-year period from the allocation date, 25% at the end of a three-year period from the allocation

date and 25% at the end of a four-year period from the allocation date (with the exception of the 123,102 2025-2 AGAs, which vest at

the end of a two-year period from the allocation date). Moreover, the vesting of half of the 4,319,500 2025-1 AGAs is subject to the

occurrence of a tender offer on the securities issued by the Group and resulting in a change of control of the Group before the second

anniversary of the grant date. Finally, the vesting of 50,000 AGA 2025-5 is subject to the achievement of milestones related to clinical

studies.

The detailed terms and conditions of these plans are set forth in Note 14.

Note 3.3. Subsequent events

Change in management – April 2025

On April 22, 2025, the Group announced the appointment of Dominik Höchli, MD to the Board of Directors of Abivax, effective

immediately.

Completion of enrollment for the Phase 3 ABTECT trials in patients with moderately to severely active UC - April 2025

On April 29, 2025, the Group announced the completion of enrollment for the Phase 3 ABTECT trials in patients with moderately to

severely active UC.

Share-based compensation plan – April-May 2025

In April 2025, the Group granted to one of its Board members the right to subscribe up to 39,370 share warrants (BSA), the vesting of

which is subject to a service condition of four years, by tranches of 25% each, vested on May, 1 of each year. The BSAs were

subscribed in May 2025.

F-14

Note 4. Accounting principles

The Group's accounting policies are the same as those described in the annual consolidated financial statements of the Group as of

December 31, 2024 accompanying the Annual Report.

Use of judgments and estimates

In preparing these unaudited condensed consolidated financial statements, management has made judgments and estimates that affect

the application of the Group’s accounting policies and the reported amounts of assets and liabilities, income and expenses. Actual

values may differ from estimated values.

The significant judgments made by management in the application of the Group’s accounting policies and the key sources of

estimation uncertainty are the same as those described in the annual consolidated financial statements of the Group as of December 31,

2024 accompanying the Annual Report.

Measurement of fair values

A number of the Group’s accounting policies require the measurement of fair values, for both financial and non-financial assets and

liabilities.

When measuring the fair value of an asset or a liability, the Group uses market observable data as far as possible. Fair values are

categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows.

•Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities.

•Level 2: inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly

(i.e., prices) or indirectly (i.e., derived from prices).

•Level 3: inputs for the asset or liability that are not based on observable market data (unobservable inputs).

Seasonality of operations

The Group’s operations are not subject to significant seasonality.

Note 5. Segment information

The assessment of the Group’s performance and the decisions about resources to be allocated are made by the chief operating decision

maker, based on the management reporting system of the Group. The Group identified the Chief Executive Officer of the Group as

“Chief operating decision maker”. The Chief operating decision maker reviews on an aggregated basis the incurred expenses for

allocating and evaluating performance of the Group.

The Group operates in a single operating segment: R&D of pharmaceutical products in order to market them in the future.

Substantially all operations, assets, liabilities, and losses of the Group are located in France. As of March 31, 2025, the Subsidiary’s

contributions to the Group’s assets, liabilities and net losses were less than 10%.

Note 6. Goodwill and impairment test

Goodwill relates to the acquisition of Splicos SAS that occurred in 2014 (i.e., prior to the transition date to IFRS) which was merged

into the Group the same year.

Goodwill from the Splicos SAS acquisition corresponds to the “Modulation of RNA biogenesis / splicing” technological platform,

from which derived the lead drug candidate of the Group: ABX464.

In accordance with IAS 36, goodwill is allocated to groups of cash generating units (CGUs) at a level corresponding to the lead drug

candidates. Thus, goodwill from Splicos SAS is allocated to the ABX464 CGU.

The net carrying amount of Splicos SAS goodwill is €18419 thousand as of December 31, 2024 and March 31, 2025.

F-15

The ABX464 product candidate being currently in development, a clinical trial failure or a failure to obtain a marketing approval

could result in an impairment. As of March 31, 2025, the Group has not identified any indication of impairment loss related to

goodwill, intangible or tangible assets.

Note 7. Intangible assets

Intangible assets are mainly comprised of the intellectual property underlying:

(i)The collaboration and license agreement with the CNRS, Montpellier 2 university and the Curie for which the Group

paid a milestone of €40 thousand in September 2019 as a result of the entry in phase 2 of ABX464.

(ii)Patents acquired through the acquisition of Prosynergia of €6,529 thousand. The patents are not yet amortized, similarly

to licenses, and are included in the ABX464 CGU for impairment test purposes.

F-16

Licenses and patents recognized as Intangible assets are not amortized since they are not operating in a manner intended by the

management. As a consequence, and in accordance with IAS 36, those assets were subject to an annual impairment test as of

December 31, 2024, which did not result in any impairment loss. As of March 31, 2025, no indicator of impairment has been

identified.

(amounts in thousands of euros)	LICENCES	SOFTWARES	PATENTS	OTHER<br><br>INTANGIBLE<br><br>ASSETS	TOTAL
GROSS VALUES
AS OF<br><br>JANUARY 1, 2024	120	24	6,529	—	6,673
Acquisition	—	—	—	—	—
Disposal	—	—	—	—	—
AS OF<br><br>MARCH 31, 2024	120	24	6,529	—	6,673
GROSS VALUES
AS OF<br><br>DECEMBER 31, 2024	120	27	6,529	—	6,677
Acquisition	—	—	—	—	—
Disposal	—	—	—	—	—
AS OF<br><br>MARCH 31, 2025	120	27	6,529	—	6,677	(amounts in thousands of euros)	LICENCES	SOFTWARES	PATENTS	OTHER<br><br>INTANGIBLE<br><br>ASSETS	TOTAL
---	---	---	---	---	---
AMORTIZATION
AS OF<br><br>JANUARY 1, 2024	(45)	(24)	—	—	(70)
Increase	—	—	—	—	—
Disposal	—	—	—	—	—
AS OF<br><br>MARCH 31, 2024	(45)	(24)	—	—	(70)
AS OF<br><br>DECEMBER 31, 2024	(45)	(25)	—	—	(70)
Increase	—	—	—	—	—
Disposal	—	—	—	—	—
AS OF<br><br>MARCH 31, 2025	(45)	(25)	—	—	(70)	(amounts in thousands of euros)	LICENCES	SOFTWARES	PATENTS	OTHER<br><br>INTANGIBLE<br><br>ASSETS	TOTAL
---	---	---	---	---	---
NET BOOK VALUES
AS OF<br><br>MARCH 31, 2024	75	—	6,529	—	6,604
AS OF<br><br>DECEMBER 31, 2024	75	3	6,529	—	6,606
AS OF<br><br>MARCH 31, 2025	75	2	6,529	—	6,606

F-17

Note 8. Property, plant and equipment

The following tables present changes in property, plant and equipment including the right of use of assets (or “ROU”) as of March

31, 2024 and 2025:

(amounts in thousands of euros)	BUILDINGS		EQUIPMENT		FURNITURE<br><br>AND<br><br>COMPUTER<br><br>EQUIPMENT		TOTAL		OF WHICH<br><br>ROU
GROSS VALUES
AS OF<br><br>JANUARY 1, 2024	1,346	—	513		507		2,366		1,262
Acquisition	—				12		12		—
Disposal	—		—		—		—		—
Effect of the change in foreign currency exhange rates	6		—		1		7		6
AS OF<br><br>MARCH 31, 2024	1,352	—	513	—	521	—	2,385	—	1,268
AS OF<br><br>DECEMBER 31, 2024	2,818	—	513		698		4,029		2,526
Acquisition	—		—		25		25		—
Disposal	—		(29)		(5)		(34)		—
Effect of the change in foreign currency exchange rates	(4)		—		(16)		(20)		(21)
AS OF<br><br>MARCH 31, 2025	2,814	—	484	—	702	—	4,000	—	2,505	(amounts in thousands of euros)	BUILDINGS	EQUIPMENT	FURNITURE<br><br>AND<br><br>COMPUTER<br><br>EQUIPMENT	TOTAL	OF WHICH<br><br>ROU
---	---	---	---	---	---	---	---	---
DEPRECIATION
AS OF<br><br>JANUARY 1, 2024	(837)	—	(387)	—	(265)	—	(1,488)	(761)
Increase	(176)		(10)		(39)		(225)	(150)
Disposal	—		—		3		3	—
AS OF<br><br>MARCH 31, 2024	(1,013)	—	(396)	—	(301)	—	(1,710)	(911)
AS OF<br><br>DECEMBER 31, 2024	(613)	—	(419)	—	(332)	—	(1,363)	(575)
Increase	(224)		(8)		(34)		(266)	(194)
Disposal	—		29		5		34	—
Effect of the change in foreign currency exhange rates	1		—		5		6	2
AS OF<br><br>MARCH 31, 2025	(836)	—	(398)	—	(356)	—	(1,590)	(767)

F-18

(amounts in thousands of euros)	BUILDINGS		EQUIPMENT		FURNITURE<br><br>AND<br><br>COMPUTER<br><br>EQUIPMENT		TOTAL		OF WHICH<br><br>ROU
NET BOOK VALUES
AS OF<br><br>MARCH 31, 2024	350	—	116	—	220	—	686	—	357
AS OF<br><br>DECEMBER 31, 2024	2,205	—	94	—	366	—	2,666	—	1,950
AS OF<br><br>MARCH 31, 2025	1,978	—	86	—	346	—	2,410	—	1,738

Right of use assets relate to buildings, vehicles and furniture. The net book value of right of use assets related to buildings amounted to

€312 thousand as of March 31, 2024 and €1,655 thousand as of March 31, 2025.

As of March 31, 2025, no indicator of impairment has been identified.

Note 9. Other financial assets

Other financial assets break down as follows:

(amounts in thousands of euros)	AS OF<br><br>DECEMBER 31,<br><br>2024	AS OF<br><br>MARCH 31,<br><br>2025
OTHER FINANCIAL ASSETS
Advances related to CRO contracts	4,929	4,986
Deposits	863	866
Other	126	126
Total other non-current financial assets	5,919	5,979
Advances related to CRO contracts	7,418	7,528
Other deposits	136	—
Total other current financial assets	7,554	7,528
Other financial assets	13,473	13,507

Advances related to CRO contracts

These advances granted in 2022 for clinical studies are to be recovered at the end of the studies after final reconciliation with pass-

through costs, which are being invoiced and paid as studies are carried out. These long-term advances were measured at fair value on

initial recognition, using discount rates ranging from 0.19% to 7.16%, and are subsequently measured at amortized cost. The recovery

dates of the first two advances are scheduled in the second half of 2025.

During the first half of 2023, additional advances related to CRO contracts amounting to €1,620 thousand were made (undiscounted

amount). These long-term advances were measured at fair value on initial recognition, using discount rates ranging from 7.09% to

7.59%, and are subsequently measured at amortized cost.

At inception, a prepaid expenses asset was recognized for the difference between the advances’ nominal value and fair value, and

spread over the term of the advances, at the rate of recognition of the related R&D expenses (see Note 10).

In March 2024, a change order was signed with the CRO, extending the scope (addition of maintenance studies) and end date of one of

the studies to 2029, thus postponing the recovery date of the corresponding advance of €5,538 thousand from June 2026 to June 2029.

The Group considered that this asset modification met the criteria for derecognition, and recognized a new financial asset at fair value

on that date, using a discount rate of 6.83%. Since the Group considers that these advances are made in exchange for a discount on

future services to be received from the CROs, a prepaid expense asset was also recognized for the difference between the

derecognized asset carrying value and new asset fair value, and spread over the term of the advance in a similar manner.

F-19

The credit risk related to these advances is deemed insignificant due to the CROs' credit ratings.

Deposits

Deposits include the Paris and Boston offices lease contracts, the ATM Program, as well as other security deposits.

Note 10. Other receivables and other assets

Other receivables and other assets break down as follows:

(amounts in thousands of euros)	AS OF<br><br>DECEMBER 31,<br><br>2024	AS OF<br><br>MARCH 31,<br><br>2025
OTHER RECEIVABLES AND OTHER ASSETS
Prepaid expenses - non current	948	858
Total non-current other assets	948	858
Research tax credit ("CIR")	5,774	6,743
VAT receivables	9,841	11,980
Prepaid expenses	3,233	2,815
Credit notes	48	24
Total current other receivables and assets	18,896	21,563
Other receivables and other assets	19,843	22,422

Research tax credit (“CIR”)

The CIR is recognized as Other Operating Income in the year to which the eligible research expense relates. The Group received the

payment of the CIR for the 2023 tax year in the amount of €4,493 thousand in the second half of 2024 and expects to receive the CIR

for the 2024 tax year of €5,774 thousand in the second half of 2025. The additional CIR of €970 thousand recorded over the three-

month ended March 31, 2025 relates to research expenses incurred the period.

Prepaid expenses

Prepaid expenses as of March 31, 2025 include prepaid expenses related to CRO contracts for an amount of €1,445 thousand (see Note

9) and other expenses from various suppliers amounting to €2,228 thousand.

Note 11. Cash and cash equivalents

Cash and cash equivalents break down as follows:

(amounts in thousands of euros)	AS OF<br><br>DECEMBER 31,<br><br>2024	AS OF<br><br>MARCH 31, 2025
CASH AND CASH EQUIVALENTS
Cash equivalents	87,265	69,711
Cash	56,956	33,865
Cash and cash equivalents	144,221	103,576

Cash equivalents mainly include term deposits with short-term maturities and highly liquid investments in mutual funds as of

December 31, 2024 and March 31, 2025 respectively.

F-20

As of December 31, 2024 and March 31, 2025, in addition to the Group’s bank accounts, cash includes notice accounts amounting to

€44,239 thousand and €26,915 thousand respectively. These funds are available on demand within 24 hours and without penalty.

As of December 31, 2024 and March 31, 2025, the impact of the revaluation of cash and cash equivalents held in U.S. dollars into the

Group's presentation currency is a net financial gain of €2,035 thousand and a net financial loss of €447 thousand, respectively.

Note 12. Financial assets and liabilities

The following table shows the carrying amounts and fair value of financial assets and financial liabilities, including their

levels in the fair value hierarchy.

Tax and employee-related payables are non-financial liabilities and are therefore excluded from the tables below. They are

presented in Note 17.2.

	AS OF<br><br>DECEMBER 31, 2024
(amounts in thousands of euros)	AMOUNT<br><br>RECOGNIZED<br><br>IN THE<br><br>STATEMENT<br><br>OF FINANCIAL<br><br>POSITION	FAIR VALUE	ASSETS/<br><br>LIABILITIES<br><br>AT FAIR<br><br>VALUE<br><br>THROUGH<br><br>PROFIT AND<br><br>LOSS	ASSETS AT<br><br>AMORTIZED<br><br>COST	LIABILITIES<br><br>AT AMORTIZED<br><br>COST
Other financial assets (2)	13,473	12,690	—	12,690	—
Other receivables and assets (2)	19,843	19,843	—	19,843	—
Cash and cash equivalents (1)	144,221	144,221	—	144,221	—
Total financial assets	177,537	176,754	—	176,754	—
Financial liabilities—non-current portion (4, Note 15)	69,069	73,497	3,620	—	69,877
Financial liabilities—current portion (3, Note 15)	44,935	44,935	21,183	—	23,752
Trade payables and other current liabilities (3)	43,824	43,824	—	—	43,824
Total financial liabilities	157,828	162,256	24,803	—	137,453	AS OF<br><br>MARCH 31, 2025
---	---	---	---	---	---
(amounts in thousands of euros)	AMOUNT<br><br>RECOGNIZED<br><br>IN THE<br><br>STATEMENT<br><br>OF FINANCIAL<br><br>POSITION	FAIR VALUE	ASSETS/<br><br>LIABILITIES<br><br>AT FAIR<br><br>VALUE<br><br>THROUGH<br><br>PROFIT AND<br><br>LOSS	ASSETS AT<br><br>AMORTIZED<br><br>COST	LIABILITIES<br><br>AT AMORTIZED<br><br>COST
Other financial assets (2)	13,507	12,500	—	12,500	—
Other receivables and assets (2)	22,422	22,422	—	22,422	—
Cash and cash equivalents (1)	103,576	103,576	65,088	38,488	—
Total financial assets	139,504	138,497	65,088	73,410	—
Financial liabilities—non-current portion (4, Note 15)	65,993	63,055	3,795	—	59,260
Financial liabilities—current portion (3, Note 15)	45,386	45,386	19,885	—	25,501
Trade payables and other current liabilities (3)	56,525	56,525	—	—	56,525
Total financial liabilities	167,904	164,966	23,680	—	141,286

(1) The fair value of cash and cash equivalents is determined based on Level 1 fair value measurement and corresponds to the

market value of the assets.

(2) The carrying amount of financial assets measured at amortized cost is deemed to be a reasonable estimate of fair value, except

for the long-term advances made to CROs, whose fair value is determined based on Level 3 fair value measurement and is estimated

based on future cash-flows discounted at market rates, using credit spreads ranging from 104 bp to 218 bp as of December 31, 2024

F-21

and 105 bp to 325 bp as of March 31, 2025. As of December 31, 2024 and March 31, 2025, an increase in the credit spread by +100 bp

would result in a decrease in the advances fair value by €236 thousand and €206 thousand respectively.

(3) The carrying amount of short-term financial liabilities measured at amortized cost was deemed to be a reasonable estimate of

fair value.

(4) The fair value of the royalty certificates, Heights convertible notes, Kreos / Claret BSA and Minimum Return Indemnifications

is based on Level 3 fair value measurement and is estimated based on models and assumptions detailed in Note 15. The fair value of

other long-term financial liabilities is determined based on Level 3 fair value measurement and is estimated based on future cash-flows

discounted at market rates, using the following assumptions:

•For the debt components of the Kreos / Claret OCABSA (tranche A) and the tranches B and C of the Kreos / Claret straight

bond loans, a credit spread of 750 bp as of December 31, 2024 and 1,000 bp as of March 31, 2025.

As of December 31, 2024 and March 31, 2025, an increase in the credit spread by +100 bp would result in a decrease in the

Kreos / Claret tranche A (OCABSA), tranches B and C debt components fair value by respectively €538 thousand and

€773 thousand respectively.

•For the PGE loan (on both reporting dates), a credit spread of 900 bp as of December 31, 2024 and 950 bp as of March 31,

As of December 31, 2024 and March 31, 2025, an increase in the credit spread by +100 bp would result in a decrease

in the PGE loan fair value by €39 thousand and €15 thousand respectively.

Note 13. Shareholders’ equity

Note 13.1. Share capital issued

The Group manages its capital to ensure that it will be able to continue as a going concern while maximizing the return to

shareholders through the optimization of the debt and equity balance.

As of March 31, 2025, the Group’s share capital amounted to 634 thousand divided into 63,418,749 ordinary shares issued with a

par value of €0.01 each, fully paid up, after taking into account the various capital increases that took place since the inception.

Share capital does not include founders’ share subscription warrants (“bons de souscription de parts de créateur d’entreprise” or

“BCE”), share subscription warrants (“Bons de souscription d’actions,” or “BSA”) and free shares (“Attributions gratuites d’actions,”

or “AGA”) that have been granted to certain investors or natural persons, both employees and non-employees of the Group, but not yet

exercised.

The Group held none of its own shares as of December 31, 2024 and March 31, 2025.

The number of outstanding ordinary shares was 63,347,837 and 63,418,749 as of December 31, 2024 and March 31, 2025,

respectively.

Note 13.2. Change in share capital

The increase in the share capital for the period ended March 31, 2025 relates to the vesting of 70,912 AGAs, resulting in the issuance

of 70,912 ordinary shares with a par value of €0.01 per share (see Note 14).

Distribution of dividends

The Group did not distribute any dividends for any of the periods presented, does not have any present plan to pay any cash dividends

on its equity securities in the foreseeable future and currently intends to retain all available funds and any future earnings to operate

and expand its business.

F-22

Note 14. Share-based payments

The Group has granted BCEs, BSAs and free shares (attributions gratuities d’actions, or “AGAs”). These plans qualify as “equity

settled” under IFRS 2. The Group does not have any obligation to purchase these instruments in the event of departure or if a specific

event does not occur.

BCEs

The following tables summarize the data relating to BCEs:

GRANT DA<br><br>TE	TYPE	TOTAL<br><br>NUMBER<br><br>OF BCEs<br><br>ISSUED	NUMBER<br><br>OF BCEs<br><br>OUTSTAND<br><br>ING AS OF<br><br>JANUARY<br><br>1, 2025	NUMBER<br><br>OF ISSUED<br><br>BCEs	NUMBER<br><br>OF LAPSED<br><br>BCEs	NUMBER<br><br>OF<br><br>EXERCISE<br><br>D BCEs	NUMBER<br><br>OF BCEs<br><br>OUTSTAND<br><br>ING	NUMBER<br><br>OF BCEs<br><br>EXERCISA<br><br>BLE	MAXIMUM<br><br>NUMBER<br><br>OF<br><br>SHARES<br><br>TO BE<br><br>ISSUED IF<br><br>ALL<br><br>CONDITIO<br><br>NS ARE<br><br>MET
				FOR THE THREE MONTHS ENDED<br><br>MARCH 31, 2025			AS OF<br><br>MARCH 31, 2025
	Total BCEs	496,965	330,179	—	—	—	330,179	245,962	330,179

BSAs

The following tables summarize the data relating to BSAs:

GRANT<br><br>DATE	TYPE	TOTAL<br><br>NUMBER<br><br>OF BSAs<br><br>ISSUED	NUMBER<br><br>OF BCAs<br><br>OUTSTAND<br><br>ING AS OF<br><br>JANUARY<br><br>1, 2025	NUMBER<br><br>OF ISSUED<br><br>BSAs	NUMBER<br><br>OF LAPSED<br><br>BSAs	NUMBER<br><br>OF<br><br>EXERCISE<br><br>D BSAs	NUMBER<br><br>OF BSAs<br><br>OUTSTAND<br><br>ING	NUMBER<br><br>OF BSAs<br><br>EXERCISA<br><br>BLE	MAXIMUM<br><br>NUMBER<br><br>OF SHARES<br><br>TO BE<br><br>ISSUED IF<br><br>ALL<br><br>CONDITIO<br><br>NS ARE<br><br>MET
				FOR THE THREE MONTHS ENDED<br><br>MARCH 31, 2025			AS OF<br><br>MARCH 31, 2025
	Total BSAs	447,344	223,944	125,000	—	—	348,944	146,124	348,944

BSAs granted in January

2025

In January 2025, the Group granted its independent Board members, as well as one of its Board Observers and Advisor, the right to

subscribe up to 125,000 share warrants (BSA) in the aggregate, the vesting of which (if subscribed) is subject to a service condition of

four years, by tranches of 25% each, vested on January, 1 of each year. Additionally, the BSAs are subject to a vesting acceleration

condition in case of a tender offer on the securities issued by the Group and resulting in a change of control of the Group. All of the

granted BSAs were subscribed by the beneficiaries in February 2025.

The fair value of the BSAs was determined at grant date using the Black Scholes model, with the following assumptions:

F-23

TYPE	FAIR VALUE<br><br>OF THE<br><br>UNDERLYING<br><br>SHARE	FAIR VALUE<br><br>OF THE BSA	NUMBER OF<br><br>BSAs	SUBSCRIPTI<br><br>ON PRICE	STRIKE<br><br>PRICE PER<br><br>SHARE	RISK FREE<br><br>RATE	EXPECTED<br><br>MATURITY	VOLATILITY
BSA-2025-1	€6.13	[€3.5-€3.9]	100,000	€2.00	€6.63	4.65%	[5.5-7 years]	60.88%
BSA-2025-2	€6.13	[€3.5-€3.9]	25,000	€2.00	€6.63	4.65%	[5.5-7 years]	60.88%

AGAs

The following tables summarize the data relating to AGAs as well as the assumptions used for the measurement thereof in

accordance with IFRS 2—Share-based Payment:

GRANT<br><br>DATE	TYPE	TOTAL<br><br>NUMBER OF<br><br>AGAs ISSUED	NUMBER OF<br><br>AGAs<br><br>OUTSTANGIN<br><br>G AS OF<br><br>JANUARY 1,<br><br>2025		NUMBER OF<br><br>ISSUED AGAs	NUMBER OF<br><br>LAPSED AGAs		NUMBER OF<br><br>VESTED AGAs		NUMBER OF AGAs<br><br>OUTSTANDING
					FOR THE PERIOD ENDED MARCH 31, 2025					AS OF MARCH 31, 2025
	Total AGAs	9,088,148	3,388,040	3<br><br>3<br><br>8<br><br>8<br><br>0<br><br>4<br><br>0	4,540,727	-72,875	0	-70,912	0	7,784,980	TYPE	FAIR VALUE OF<br><br>THE<br><br>UNDERLYING<br><br>SHARE	FAIR VALUE OF<br><br>THE AGA	MATURITY	VOLATILITY	RISK FREE RATE
---	---	---	---	---	---
AGA-2025-1	€5.82	€5.82	N/A	N/A	N/A
AGA-2025-2	€5.82	€5.82	N/A	N/A	N/A
AGA-2025-3	€5.82	€5.82	N/A	N/A	N/A
AGA-2025-4	€5.82	€5.82	N/A	N/A	N/A
AGA-2025-5	€6.17	€6.17	N/A	N/A	N/A

AGAs granted in February and March 2025

In February 2025, , certain of the Group’s officers and employees were allocated respectively 4,319,500 AGAs (AGA plan 2025-1),

123,102 AGAs (AGA plan 2025-2), 17,625 AGAs (AGA plans 2025-3) and 30,500 AGAs (AGA plan 2025-4) in the aggregate, the

vesting of which is subject to certain conditions:

•Subject to remaining employed with the Group, each such officer or employee’s AGAs will be vested as follows: (i) 50% at

the end of a two-year period from the allocation date, (ii) 25% at the end of a three-year period from the allocation date and

(iii) 25% at the end of a four-year period from the allocation date (service condition).

•By exception to the above, the vesting of half of the 4,319,500 2025-1 AGAs is subject to the occurrence of a tender offer on

the securities issued by the Group and resulting in a change of control of the Group before the second anniversary of the grant

date.

•Additionally, all the remaining 2025-1 AGAs as well as the 2025-2, 2025-3 and 2025-4 AGAs are subject to a vesting

acceleration condition in case of a tender offer on the securities issued by the Group and resulting in a change of control of

the Group.

In March 2025, a Group employee was allocated respectively 50,000 AGAs (AGA plan 2025-5), the vesting of which is subject to the

achievement of certain milestones related to clinical studies and market authorization of ABX464 in UC and CD.

Breakdown of the compensation expenses accounted for the three-month periods ended March 31, 2024 and 2025:

F-24

TYPE<br><br>(in thousands of euros)	FOR THE<br><br>THREE<br><br>MONTHS<br><br>ENDED<br><br>MARCH 31,<br><br>2024	FOR THE<br><br>THREE<br><br>MONTHS<br><br>ENDED<br><br>MARCH 31,<br><br>2025
BCEs	(28)	—
BSAs	—	(65)
AGAs	(5,727)	(4,623)
Social taxes related to AGAs	(461)	(683)
Total	(6,216)	(5,372)

Note 15. Financial liabilities

Financial liabilities break down as follows:

(amounts in thousands of euros)
FINANCIAL LIABILITIES	AS OF<br><br>DECEMBER 31,<br><br>2024	AS OF<br><br>MARCH 31, 2025
Kreos & Claret bond loans	26,373	21,930
Lease liabilities	1,431	1,191
PGE	1,252	1,252
Borrowings	29,056	24,373
Kreos / Claret convertible notes (OCABSA)	23,370	23,819
Convertible loan notes	23,370	23,819
Kreos / Claret Minimum Return Indemnifications	3,620	3,795
Derivative instruments	3,620	3,795
Royalty certificates	13,023	14,006
Other financial liabilities	13,023	14,006
Total non-current financial liabilities	69,069	65,993
Kreos & Claret bond loans	20,028	21,902
Lease liabilities	932	931
PGE	1,235	1,258
Borrowings	22,195	24,091
Heights convertible notes	21,574	20,273
Convertible loan notes	21,574	20,273
Kreos / Claret BSA	1,166	1,021
Derivative instruments	1,166	1,021
Total current financial liabilities	44,935	45,386
Total financial liabilities	114,004	111,379

Note 15.1. Structured debt financing with Kreos & Claret subscribed in August 2023 – “Kreos / Claret Financing”

The Kreos / Claret Financing consists of three tranches of €25,000 thousand each in aggregate principal amount (the convertible

OCABSA and the second and third tranches of non-convertible bonds, respectively the "tranches A, B and C") as well as a Minimal

F-25

Return Indemnification ("MRI") to the benefit of the bondholders.

In addition to the Kreos / Claret OCABSA, the Group has issued share warrants (the “tranche A-B BSA” and “tranche C BSA”),

giving Kreos and Claret the right to subscribe to up to 214,198 and 405,832 ordinary shares respectively.

The OCABSA are compound instruments, split between (i) a debt component (then measured at amortized cost) and (ii) an equity

component corresponding to the conversion option and the attached OCABSA warrants.

The OCABSA warrants are considered as an embedded component of the bonds rather than a separate stand-alone financial

instrument.

The Kreos / Claret second and third tranches are hybrid instruments, split between (i) debt host contracts accounted for at amortized

cost and (ii) bifurcated embedded derivatives accounted for at fair value through profit and loss, corresponding to the Minimal Return

Indemnifications and the prepayment options (the fair value of the prepayment options being deemed insignificant at issuance and as

of December 31, 2024 and March 31, 2025).

As the A-B and C warrants (the "Kreos / Claret BSA") are contractually transferable separately from the bonds and are redeemable in

a variable number of ordinary shares of the Group, they are classified as standalone derivative financial liabilities.

The detailed terms and conditions and the accounting treatment of these instruments are presented in Note 15.1 to the annual

consolidated financial statements of the Group as of December 31, 2024 accompanying the Group’s Annual Report.

F-26

Measurement of the Kreos / Claret second and third tranches hybrid instruments

At inception, the net cash proceeds reflect the tranches' initial fair values. The fair values of the Minimal Return Indemnifications were

deducted from the initial carrying values of the debt components of each tranche, which were subsequently measured at amortized cost

using the EIR method.

The fair values of the Minimum Return Indemnifications were measured using the following assumptions:

Tranche B Minimum Return Indemnification (issued in March<br><br>2024)	AS OF DECEMBER 31, 2024	AS OF MARCH 31, 2025
Final redemption scenario probability	95%	95%
Minimal return	1.40x	1.40x
Discount rate	7.5%	10%
Probability-weighted present value of shortfall payment (in<br><br>thousands of €)	2,635 (Final redemption)<br><br>136 (Tender offer)	2,669 (Final redemption)<br><br>139 (Tender offer)
Probability-weighted fair value of tranche A-B warrants with MRI<br><br>(in thousands of €)	104 (Final redemption)	108 (Final redemption)
Probability-weighted fair value of tranche A-B warrants without<br><br>MRI (in thousands of €)	241 (Final redemption)	225 (Final redemption)
Total fair value of MRI (in thousands of €)	2,499 (Final redemption, i.e. a+b-c)<br><br>136 (Tender offer)	2,552 (Final redemption)<br><br>139 (Tender offer)
Fair value of Tranche B MRI (in thousands of €)	2,636	2,691	Tranche C Minimum Return Indemnification (issued in June<br><br>2024)	AS OF DECEMBER 31, 2024	AS OF MARCH 31, 2025
---	---	---
Final redemption scenario probability	95%	95%
Minimal return	1.30x	1.30x
Discount rate	7.5%	10%
(a) Probability-weighted present value of shortfall payment (in<br><br>thousands of €)	1,160 (Final redemption)<br><br>43 (Tender offer)	1,233 (Final redemption)<br><br>52 (Tender offer)
(b) Probability-weighted fair value of tranche C warrants with MRI<br><br>(in thousands of €)	684 (Final redemption)	597 (Final redemption)
(c) Probability-weighted fair value of tranche C warrants without<br><br>MRI (in thousands of €)	903 (Final redemption)	779 (Final redemption)
Total fair value of MRI (in thousands of €)	941 (Final redemption, i.e. a+b-c)<br><br>43 (Tender offer)	1,051 (Final redemption)<br><br>52 (Tender offer)
Fair value of Tranche C MRI (in thousands of €)	984	1,104

For the purpose of measuring the fair value of the MRI (shortfall payment), the fair value of the tranche A-B and C BSA was

measured with a Black Scholes model under the Final redemption scenario and with a Monte Carlo model under the Tender offer

scenario.

As of December 31, 2024, using the same assumption with an increase of +1% volatility, €+1 share price, +1% risk-free rate, +10% in

the probability of achieving the Final redemption scenario and +1% discount rate would result in changes of the MRI B and C fair

value by respectively €-1 thousand, €-3 thousand, €-3 thousand, €+3 thousand and €-82 thousand.

As of March 31, 2025, using the same assumption with an increase of +1% volatility, €+1 share price, +1% risk-free rate, +10% in the

probability of achieving the Final redemption scenario and +1% discount rate would result in changes of the MRI B and C fair value

by respectively €-3 thousand, €-87 thousand, €-9 thousand, €-2 thousand and €-74 thousand.

F-27

Measurement of the Kreos / Claret tranche A-B-C BSA

The Kreos / Claret tranche A-B and tranche C BSA are measured at fair value using a Black-Scholes valuation model. The model

considers two probability-weighted scenarios, i.e. (i) the 7-year expiry of the BSA and (ii) an earlier exercise upon a tender offer. The

main data and assumptions are the following:

Kreos/Claret Tranche A-B BSA (issued in August 2023)	AS OF DECEMBER 31, 2024	AS OF MARCH 31, 2025
Number of outstanding BSA	214,198	214,198
Exercise price per share	€18.67	€18.67
Ordinary share price	€6.76	€5.75
Exercise date	19/08/2030 (expiry)<br><br>18/02/2027 (tender offer)	19/08/2030 (expiry)<br><br>18/02/2027 (tender offer)
7-year expiry scenario probability	95%	95%
Volatility	44.3% (expiry)<br><br>44.3% (tender offer)	51.7% (expiry)<br><br>51.7% (tender offer)
Dividend	—%	—%
Risk-free rate	2.9% (expiry)<br><br>2.9% (tender offer)	2.4% (expiry)<br><br>2.4% (tender offer)
Fair value of issued Kreos/Claret Tranche A-B BSA	243	227	Kreos/Claret Tranche C BSA (issued in November 2023)	AS OF DECEMBER 31, 2024	AS OF MARCH 31, 2025
---	---	---
Number of outstanding BSA	405,832	405,832
of which, number of conditional BSA	0	0
Exercise price per share	€9.86	€9.86
Ordinary share price	€6.67	€5.75
Exercise date	01/11/2030 (expiry)<br><br>18/02/2027 (tender offer)	01/11/2030 (expiry)<br><br>18/02/2027 (tender offer)
7-year expiry scenario probability	95%	95%
Probability of Drawdown of Tranche C credit facility	Drawn on June 21, 2024	Drawn on June 21, 2024
Volatility	44.3% (expiry)<br><br>44.3% (tender offer)	51.7% (expiry)<br><br>51.7% (tender offer)
Dividend	0	—%
Risk-free rate	2.9% (expiry)<br><br>2.9% (tender offer)	2.4% (expiry)<br><br>2.4% (tender offer)
Fair value of issued Kreos/Claret Tranche C BSA	923	794

As of December 31, 2024, using the same assumption with an increase of +1% volatility, €+1 share price, +1% risk-free rate and

+10% in the probability of achieving the 7 years expiry scenario would result in an increase of Kreos / Claret A-B and C BSA fair

value by respectively €37 thousand, €350 thousand, €61 thousand and€75 thousand.

As of March 31, 2025, using the same assumption with an increase of +1% volatility, €+1 share price, +1% risk-free rate and +10% in

the probability of achieving the 7-year expiry scenario would result in an increase of Kreos / Claret A-B and C BSA fair value by

respectively €30 thousand, €339 thousand, €45 thousand and €74 thousand.

F-28

Note 15.2. Heights convertible notes

The Heights convertible notes consists of (i) a host debt instrument and (ii) conversion and settlement options representing embedded

derivatives. The whole instrument is measured at fair value through profit or loss ("FVTPL") at each reporting date.

In application of the Amendments to IAS 1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-

current, and Non-current Liabilities with Covenants, the Heights convertible notes are classified as current financial liabilities.

The fair value of the Heights convertible notes (including the embedded features) has been measured with a Monte Carlo model,

considering two probability-weighted scenarios: (i) a Put Event or Default/Dissolution scenario and (ii) a voluntary conversion at

maturity scenario. The main data and assumptions are the following:

Heights convertible notes (issued in August 2023)	AS OF<br><br>DECEMBER 31, 2024	AS OF<br><br>MARCH 31, 2025
Number of outstanding notes	350	350
Original principal amount (in thousands of €)	35,000	35,000
Interest rate	6%	6%
Conversion price per share	€23.77	€23.77
Ordinary share price	€6.76	€5.75
Maturity date	24/08/2025 (put event)<br><br>24/08/2027 (HTM/voluntary conversion)	24/08/2025 (put event)<br><br>24/08/2027 (HTM/voluntary conversion)
Held to maturity / voluntary conversion scenario<br><br>probability	75%	75%
Initial price limit	€14.43	€14.43
Early redemption amount (put event)	120%	120%
Volatility	50%	50%
Credit spread	25%	25%
Risk-free rate	2.9%	2.4%
Fair value of Heights convertible notes (in<br><br>thousands of €)	20,017	18,864

As of December 31, 2024, using the same assumptions with an increase of +1% volatility, €+1 share price, +1% risk-free rate and

+10% probability of achieving the held to maturity scenario would result in a change in the Heights convertible notes fair value by

respectively €+2 thousand, €+39 thousand, €-219 thousand and €-631 thousand.

As of March 31, 2025, using the same assumptions with an increase of +1% volatility, €+1 share price, +1% risk-free rate and +10%

probability of achieving the held to maturity scenario would result in a change in the Heights convertible notes fair value by

respectively €+5 thousand, €+36 thousand, €-166 thousand and €-667 thousand.

On the limit date for the drawdown of the second tranche of the Heights Financing (i.e. August 4, 2024), the Group had not drawn

down this tranche and has therefore forgone its right to do so in the future.

F-29

Note 15.3. State guaranteed loan – “PGE”

The payment of the next installment of the PGE is scheduled in June 2025.

Note 15.4. Lease liabilities

The variations in lease liabilities are set forth below:

(amounts in thousands of euros)	LEASE LIABILITY
AS OF<br><br>DECEMBER 31, 2023	540
(+) Increase	6
(-) Decrease	(177)
AS OF<br><br>MARCH 31, 2024	369
AS OF<br><br>DECEMBER 31, 2024	2,363
(+) Increase
(-) Decrease	(241)
AS OF<br><br>MARCH 31, 2025	2,122

Lease liabilities mainly relate the Group’s former headquarters in Paris (the lease of which ended on June 2024), the Boston office

entered into in November 2023, the Montpellier offices entered into in April 2024, the new Paris headquarters entered into in May

2024 and to a lesser extent to vehicles, parking lots and printers (Note 8).

As of December 31, 2024 and March 31, 2025, the lease liabilities of the Paris headquarters and Boston offices represented 93% and

90% of the total lease liability, respectively.

Lease expenses related to contracts for which a lease liability and right of use asset is recognized under IFRS 16 were €114 thousand

and €219 thousand for the three-month periods ended March 31, 2024 and 2025, respectively. They were recognized for (i)

€150 thousand and €194 thousand as Depreciation expenses and (ii) €5 thousand and €19 thousand as Interest expenses, for the three-

month periods ended March 31, 2024 and 2025, respectively.

Lease expenses related to short-term lease contracts and low value assets that are not included in the valuation of the lease liability

amount to €3 thousand, and €87 thousand for the three-month periods ended March 31, 2024 and 2025, respectively.

Note 15.5. Royalty certificates

The royalty certificates are measured at amortized cost using the EIR method.

The fair value of the royalty certificates, calculated using the same model as their initial measurement, amounts to €7,313 thousand as

of December 31, 2024 and €7,354 thousand as of March 31, 2025.

The fair value of the royalty certificates is based on the net present value of royalties, which depends on assumptions made by the

Group with regards to the probability of success of its studies (“POS”), the commercialization budget of obefazimod (“peak

penetration”) and the Group's WACC. In addition, royalty projections have been adjusted to reflect any difference between the

Group’s value derived from management projections and the Group’s market capitalization.

F-30

As of December 31, 2024, using the same assumptions with an increase of +5 points of POS, +5% of peak penetration (best case

scenario), +1% WACC and €+1 share price would result in a change in the royalty certificates fair value by respectively €

+572 thousand, €+1,735 thousand, €-314 thousand and €+1,160 thousand. Using the same assumptions with a decrease of -5% points

of POS, -5% of peak penetration (worst case scenario) and -1% WACC and €-1 share price would result in a change in the royalty

certificates fair value by respectively €-572 thousand, €-2,527 thousand, €+332 thousand and €-1,160 thousand.

As of March 31, 2025, using the same assumptions with an increase of +5 points of POS, +5% of peak penetration (best case

scenario), +1% WACC and €+1 share price would result in a change in the royalty certificates fair value by respectively €

+575 thousand, €+1,782 thousand, €-302 thousand and €+1,273 thousand. Using the same assumptions with a decrease of -5% points

of POS, -5% of peak penetration (worst case scenario) and -1% WACC and €-1 share price would result in a change in the royalty

certificates fair value by respectively €-575 thousand, €-2,595 thousand, €+318 thousand and €-1,273 thousand.

F-31

Note 15.6. Change in financial liabilities

Changes in financial liabilities, excluding derivative instruments, are presented below as of March 31, 2024 and 2025:

(Amounts in thousands of euros)
FINANCIAL LIABILITIES (excluding<br><br>derivatives instruments)	Kreos/<br><br>Claret<br><br>convertible<br><br>notes<br><br>(OCABSA)	Kreos &<br><br>Claret<br><br>bond<br><br>loans	Heights<br><br>convertibl<br><br>e notes	PGE	Conditional<br><br>advances BPI	Lease<br><br>liabilities	Royalty<br><br>certificates	Total
AS OF<br><br>JANUARY 1, 2024	21,643	—	29,605	3,678	6,771	540	12,229	74,466
Proceeds	—	23,585	—	—		—	—	23,585
Repayments	—	—	(2,188)	—	(28)	(177)	—	(2,392)
Interest paid	(563)	(32)	(492)	(11)		5		(1,093)
Non-cash changes: classification of<br><br>embedded derivatives as separate<br><br>derivative financial instruments	—	(2,729)	—	—	—	—	—	(2,729)
Non-cash changes: (gain)/loss on<br><br>recognition or derecognition	—	—	(147)	—	—	—	—	(147)
Non-cash changes: interest expense and<br><br>other	963	(39)	474	41	22	1	932	2,392
Non-cash changes: other fair value<br><br>remeasurement	—	—	(1,571)	—	—	—	—	2,024
AS OF<br><br>MARCH 31, 2024	22,043	20,785	25,680	3,708	6,765	368	13,161	96,106
(Amounts in thousands of euros)
FINANCIAL LIABILITIES (excluding<br><br>derivatives instruments)	Kreos/<br><br>Claret<br><br>convertibl<br><br>e notes<br><br>(OCABSA<br><br>)	Kreos &<br><br>Claret<br><br>bond<br><br>loans	Heights<br><br>convertib<br><br>le notes	PGE	Conditional<br><br>advances BPI	Lease<br><br>liabilitie<br><br>s	Royalty<br><br>certificate<br><br>s	Total
AS OF<br><br>JANUARY 1, 2025	23,370	46,401	21,574	2,488	—	2,363	13,023	109,218
Proceeds	—	—	—	—	—	—	—	—
Repayments	—	(3,705)	(2,188)	—	—	(230)	—	(6,122)
Interest paid	(563)	(1,019)	(361)	—	—	(19)	—	(1,962)
Non-cash changes: (gain)/loss on<br><br>recognition or derecognition	—	—	(147)	—	—	—	—	(147)
Non-cash changes: interest expense and<br><br>other	1,012	2,155	344	22	—	19	983	4,535
Non-cash changes: other fair value<br><br>remeasurement	—	—	1,051	—	—	—	—	1,051
Non cash changes : Effect of the change in<br><br>foreign currency exhange rates	—	—	—	—	—	(11)	—	(11)
AS OF<br><br>MARCH 31, 2025	23,819	43,832	20,273	2,510	—	2,122	14,006	106,563

For the three-month period ended March 31, 2024, proceeds from the issuance of the Kreos / Claret tranche B bond loan are presented

net of transaction costs and deposits (corresponding to the prepayments of half of the last debt installments on issuance date) included

in the debt discount using the EIR method, and amounting to €875 thousand and €540 thousand respectively. Net proceeds from non-

convertible bond loans of €24,625 thousand disclosed in the Unaudited Condensed Consolidated Statements of Cash Flows for the

three-month period ended March 31, 2024 do not include transaction fees of (i) €500 thousand related to the Kreos / Claret tranche A-

B warrants classified as prepaid expenses as of December 31, 2023.

Note 15.7. Change in derivative instruments

Changes in derivative instruments, are presented below as of March 31, 2024 and 2025:

F-32

(amounts in thousands of euros)	Kreos/Claret BSA	Kreos/Claret<br><br>Minimum Return<br><br>Indemnifications	Total
DERIVATIVE FINANCIAL<br><br>INSTRUMENTS
AS OF<br><br>JANUARY 1, 2024	2,579	—	2,579
(+) Issuance	—	1,683	1,683
(+) Increase in fair value	1,187	—	1,187
AS OF<br><br>MARCH 31, 2024	3,766	1,683	5,449
AS OF<br><br>JANUARY 1, 2025	1,166	3,620	4,786
(+) Increase in fair value		175	175
(-) Decrease in fair value	(145)		(145)
AS OF<br><br>MARCH 31, 2025	1,021	3,795	4,816

Details related to these instruments' accounting treatments and terms and conditions are set forth in Notes 15.1 and 15.2 of these

financial statements, as well as in Notes 15.1 and 15.2 to the annual consolidated financial statements of the Group as of December 31,

2024 accompanying the Group’s Annual Report.

Note 15.8. Breakdown of financial liabilities by maturity

The following are the remaining contractual maturities of financial liabilities as of December 31, 2024 and March 31, 2025. The

amounts are gross and undiscounted, and include contractual interest payments.

	AS OF<br><br>DECEMBER 31, 2024
CURRENT AND NON-CURRENT<br><br>FINANCIAL LIABILITIES	GROSS<br><br>AMOUNT	CONTRACTUAL<br><br>CASH FLOWS	LESS THAN 1<br><br>YEAR	FROM 1 TO 2<br><br>YEARS	FROM 2 TO 5<br><br>YEARS	LONGER<br><br>THAN 5<br><br>YEARS
(amounts in thousands of euros)
Heights convertible notes	21,574	24,063	8,750	8,750	6,563	—
Kreos/Claret convertible notes<br><br>(OCABSA)	23,370	30,653	2,250	19,943	8,460	—
Other Kreos/Claret bond loans	46,401	58,080	24,016	25,715	8,348	—
PGE	2,488	2,586	1,293	1,293	—	—
Royalty certificates	13,023	—	—	—	—	—
Lease liabilities	2,363	2,512	993	996	516	7
Derivative instruments	4,786	4,786	1,166	—	3,620	—
Total financial liabilities	114,004	122,680	38,468	56,698	27,507	7

F-33

	AS OF<br><br>MARCH 31, 2025
CURRENT AND NON-CURRENT<br><br>FINANCIAL LIABILITIES	GROSS<br><br>AMOUNT	CONTRACTUAL<br><br>CASH FLOWS	LESS THAN 1<br><br>YEAR	FROM 1 TO 2<br><br>YEARS	FROM 2 TO 5<br><br>YEARS	LONGER<br><br>THAN 5<br><br>YEARS
(amounts in thousands of euros)
Heights convertible notes	20,273	23,680	9,866	9,341	4,473	—
Kreos/Claret convertible notes<br><br>(OCABSA)	23,819	30,090	2,250	27,840	—	—
Other Kreos/Claret bond loans	43,832	53,089	25,585	27,504	—	—
PGE	2,510	2,586	1,293	1,293	—	—
Royalty certificates (1)	14,006	—	—	—		—
Lease liabilities	2,122	2,264	995	956	314	—
Derivative instruments	4,816	4,816	1,021	3,795		—
Total financial liabilities	111,379	116,526	41,009	70,730	4,787	—

(1) The contractual cash flows above do not include potential future royalty payments related to the royalty certificates, amounting to

2% of the future net sales of obefazimod (worldwide and for all indications). The amount of royalties that may be paid under the

royalty certificates is capped at €172.0 million in the aggregate. Royalty payments are expected to take place before the expiry date of

the certificates, which is 15 years after their issuance date (September 2, 2037), and would be included in the "from 2 to 5 years" and

"longer than 5 years" maturity categories according to management's projections.

Note 16. Retirement benefit obligations

Retirement benefit obligations include the liability for the defined benefit plan, measured based on the provisions stipulated

under the applicable collective agreements, i.e. the French pharmaceutical industry’s collective agreement. This commitment

only applies to employees subject to French law. Employees in the U.S. benefit from defined contribution plans (401(k)).

Note 17. Payables and other current liabilities

Note 17.1. Trade payables and other current liabilities

Trade payables and other current liabilities break down as follows:

(amounts in thousands of euros)
TRADE PAYABLES AND OTHER CURRENT LIABILITIES	AS OF<br><br>DECEMBER 31,<br><br>2024	AS OF<br><br>MARCH 31, 2025
Trade payables	30,748	34,046
Accrued invoices	13,049	22,480
Other	26	—
Trade payables and other current liabilities	43,824	56,525

The increase in accrued invoices as of March 31, 2025 compare to December 31, 2024 is mainly explained by upcoming

milestones and increased activity on ABTECT reflecting the progress on phase 3 clinical trials.

F-34

Note 17.2. Tax and employee-related payables

Tax and employee-related payables are presented below:

(amounts in thousands of euros)
TAX AND EMPLOYEE-RELATED PAYABLES	AS OF<br><br>DECEMBER 31,<br><br>2024	AS OF<br><br>MARCH 31, 2025
Employee-related payables	2,742	1,353
Social security and other	1,783	1,506
Other tax and related payments	184	207
Tax and employee-related payables	4,709	3,065

Note 18. Operating income

Operating income is composed as below:

(amounts in thousands of euros)
OPERATING INCOME	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
Research tax credit ("CIR")	1,150	970
Subsidies	25	—
Other	12	24
Total operating income	1,186	994

Research tax credit (“CIR”)

The Group carries out research and development projects. As such, it has benefited from a research tax credit for the periods ended

March 31, 2024 and 2025 for an amount of €1,150 thousand and €970 thousand, respectively.

Subsidies

Subsidies primarily relate to the Bpifrance RNP-VIR and CARENA conditional advances, the repayments of which were partly

waived by Bpifrance in June 2024, for €1,872 thousand and €2,251 thousand respectively (see Note 3.1).

Other

For the three-month period ended March 31, 2025, the line item "Other" mainly includes issuance, cancellation and depositary service

fees collected from ADSs holders by Citibank, who is acting as the Group's exclusive depositary for its publicly listed and freely

traded ADSs. As part of the depositary agreement between Citibank and the Group, the latter is entitled to receive a portion of the

aforementioned fees collected by Citibank.

Note 19. Operating expenses

Note 19.1. Sales and marketing

F-35

(amounts in thousands of euros)
SALES AND MARKETING	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
Personnel costs	1,090	470
Consulting and professional fees	546	218
Other sales and marketing expenses	342	172
Sales & Marketing	1,977	860

The sales and marketing expenses as of March 31, 2025 consist primarily in consulting costs associated with market research in

preparation for the Group's future sales and commercialization efforts in the U.S.

Note 19.2. Research and development

Research and development expenses break down as follows:

(amounts in thousands of euros)
RESEARCH AND DEVELOPMENT EXPENSES	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
Sub-contracting, studies and research	27,075	29,153
Personnel costs	4,552	5,069
Consulting and professional fees	3,209	3,981
Intellectual property fees	341	239
Other research and development expenses	567	860
Research and development expenses	35,744	39,301

For the three-month period ended March 31, 2025, research and development expenses were €39,301 thousand, as compared to

€35,744 thousand for the three-month period ended March 31, 2024. This increase was primarily due to a €2,988 thousand increase in

expenses related to the CD program, resulting from the progression of the Phase 2b trials in CD and a €2,707 thousand increase in

transversal activities related to the overall expansion of the research and development headcount to support the Group's organizational

growth and the issuance of new equity awards to officers and employees in research and development. These were partially offset by a

€1,302 thousand decrease in expenses related to the UC clinical program.

Note 19.3. General and administrative

(amounts in thousands of euros)
GENERAL AND ADMINISTRATIVE EXPENSES	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
Personnel costs	5,274	4,688
Consulting and professional fees	1,517	1,935
Other general and administrative expenses	1,345	1,410
General and administrative expenses	8,136	8,033

For the three-month period ended March 31, 2025, general and administrative expenses were €8,033 thousand, as compared to

€8,136 thousand for the three-month period ended March 31, 2024. This decrease was primarily due to a decrease in personnel costs of

€586 thousand, or 11%, mainly resulting from the expense recognition pattern of equity awards granted to certain of the Group's

F-36

officers and employees, many of which were issued in connection with the Group's U.S. initial public offering and listing on Nasdaq in

October 2023, as well as strict adherence to the approved budget, which includes savings through the gating of non essential spend.

These were partially offset by increased legal and professional fees and other costs associated with operating as a dual-listed public

company.

Note 20. Employees

The Group’s average workforce during the periods ended March 31, 2024 and 2025 was as follows:

HEADCOUNTS	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
France	34	42
United States	27	27
Total	61	69

F-37

Note 21. Financial gain (loss)

The financial loss breaks down as follows:

(amounts in thousands of euros)
FINANCIAL GAIN (LOSS)	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
Interest on bond loans	39	(2,155)
Interest on convertible loan notes	(1,436)	(1,356)
Interest on conditional advances	(51)	(22)
Interest on royalty certificates	(932)	(983)
Interest on lease liabilities	(5)	(19)
Increase in derivatives fair value	(1,187)	(175)
Increase in other liabilities at fair value through profit and loss	—	(1,051)
Transaction costs	(581)	—
Foreign exchange losses	(69)	(954)
Other	(5)	(6)
Financial expenses	(4,228)	(6,723)
Interest income	2,534	859
Decrease/(increase) in derivatives fair value	—	145
Decrease/(increase) in other liabilities at fair value through profit and loss	1,571	—
Effect of unwinding the discount related to advances made to CROs	182	233
Day-one gain on recognition of financial liabilities	147	147
Foreign exchange gains	1,585	80
Other financial income	12	88
Financial income	6,031	1,552
Financial gain (loss)	1,803	(5,170)

Increases and decreases in the fair value of derivatives for the three-month period ended March 31, 2025 are detailed in Notes 15.1,

15.2 and 15.7.

The decrease and increase in other liabilities at fair value through profit or loss ("FVTPL") mainly relate to the Heights notes for the

three-month period ended March 31, 2024 and March 31, 2025 respectively (see Note 15.2).

Transaction costs for the three-month period ended March 31, 2024 mainly relate to the amortization of the prepaid expenses related to

the transaction costs of the Kreos / Claret tranche C bond loans.

Interest income mainly relates to the invested proceeds from (i) the Group's initial public offering on the Nasdaq Global Market

and the concurrent European Private Placement from October 2023, and (ii) the Kreos / Claret and Heights Financings.

Foreign exchange losses for the three-month period ended March 31, 2025 relate to the translation of cash and cash equivalents held in

U.S. dollars into the Group's presentation currency as of March 31, 2025 (see Note 11), resulting in a loss of €447 thousand, and to

other realized and unrealized losses on foreign exchange transactions.

Note 22. Income tax

The Group incurred tax losses in the current period and prior years. As the recoverability of these tax losses is not considered probable

in subsequent periods due to the uncertainties inherent in the Group’s business, the Group has not recognized deferred tax assets

beyond deferred tax liabilities arising within the same taxable entity under the same taxable regime and with consistent timing of

reversal, after considering, if applicable, limitations in the use of deductible tax losses carried forward from prior periods applicable

under tax laws in France and in the U.S.

F-38

Note 23. Income (loss) per share

Basic losses per share is calculated by dividing income (loss) attributable to equity holders of the Group by the weighted-

average number of outstanding ordinary shares for the period.

Diluted losses per share are calculated by adjusting the weighted average number of ordinary outstanding shares to assume

conversion of all dilutive potential ordinary shares.

(amounts in thousands of euros, except share data)
BASIC AND DILUTED LOSS PER SHARE	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2024	FOR THE THREE<br><br>MONTHS ENDED<br><br>MARCH 31, 2025
Weighted average number of outstanding shares	62,917,553	63,378,911
Net loss for the period	(42,867)	(52,370)
Basic and diluted loss per share (€/share)	(0.68)	(0.83)

Since net results for the three-month period ended March 31, 2024 and 2025 are losses, potentially dilutive instruments (BCEs, BSAs,

AGAs, the OCABSA, the Kreos / Claret BSAs and the Heights notes) have been excluded from the computation of diluted weighted-

average shares outstanding, because such instruments had an antidilutive impact. Consequently, the diluted losses per share are the

same as the basic losses per share.

Note 24. Related parties

Except for share-based compensation plans (see Note 14), the Group has not engaged in any new transaction with its related parties

over the three-month period ended March 31, 2025.

Note 25. Off-balance sheet commitments given

On December 12, 2024, the Group was notified of a claim from the seller of Prosynergia requesting the payment of an earn-out in

connection with the transaction. Legal proceedings are ongoing in French court. The Group has not recorded any provision in its

financial statements in connection with this claim due to uncertainty in the outcome of this proceeding.

Over the period ended March 31, 2025, the Group has not given any significant additional off-balance sheet commitment or amended

already existing commitments. The off-balance sheet commitments given by the Group as of March 31, 2025 are identical to

December 31, 2024, which the exception of the following changes in the commitments related to CRO contracts:

In the ordinary course of business, the Group regularly uses the services of subcontractors and enters into research and partnership

arrangements with various contract research organizations, or CROs, and with public- sector partners or subcontractors, who conduct

clinical trials and studies in relation to the drug candidates. As of December 31, 2024 and March 31, 2025, the Group’s commitments

amounted to respectively €234,908 thousand and €220,526 thousand. The cost of services performed by CROs is recognized as an

operating expense as incurred.

F-39

Note 26. Off-balance sheet commitments received and contingent assets

Over the three-month period ended March 31, 2025, the Group has not received any significant additional commitment and has not

identified any contingent assets susceptible to being recognized in the future.

Note 27. Management and assessment of financial risks

The Group is exposed to interest rate risk, credit risk, foreign currency risk and liquidity risk. The Group has not identified any

significant changes in the identified credit and interest rate risks as of March 31, 2025 compared to December 31, 2024.

Liquidity risk

The remaining contractual maturities of financial liabilities as of December 31, 2024 and March 31, 2025 are presented in Note 15.8.

The Group's estimate of its cash runway as of the date of approval of these financial statements is set forth in Note 2 - Going concern.

Foreign currency risk

The Group is exposed to a risk of exchange rates fluctuations on commercial transactions performed in currencies different from the

functional currency of the Group entity recording the transactions.

For three-month period ended March 31, 2025, expenses in U.S. dollars totaled €3,101 thousand based on the average annual

exchange rate on that date. As a result, an adverse 10% change in the exchange rate for the U.S. dollar against the euro would have

resulted in a foreign exchange rate loss of approximately €345 thousand for the three-month period ended March 31, 2025.

At this stage, the Group has not adopted any other recurring mechanism of hedging to protect its activity against currency fluctuations.

From time to time, the Group may nevertheless subscribe currency term accounts in order to cover a commitment in currency as

described above. The Group may consider in the future using a suitable policy to hedge exchange risks in a more significant manner if

needed.

Document

Abivax Presents First Quarter 2025 Financial Results

PARIS, France, June 2, 2025, 10:00 p.m. CEST – Abivax SA (Euronext Paris: FR0012333284 – ABVX / Nasdaq – ABVX) (“Abivax” or the “Company”), a clinical-stage biotechnology company focused on developing therapeutics that harness the body’s natural regulatory mechanisms to modulate the inflammatory response in patients with chronic inflammatory diseases, announces today its key financial results for the quarter ended March 31, 2025.

Abivax provided the following updates on its business and operational goals in press releases published:

•On January 9, 2025 in a press release titled “Abivax Achieves Key Milestone in Phase 3 ABTECT Trial Enrollment”

•On January 23, 2025 in a press release titled “Abivax Announces Presentation of Seven Abstracts for Obefazimod in Ulcerative Colitis at 2025 European Crohn’s and Colitis Organization 20th Annual Congress”

•On January 28, 2025 in a press release titled “Abivax Publishes 2025 Financial Calendar”

•On February 21, 2025 in a press release titled “Abivax to Host Key Opinion Leader (KOL) Webcast on March 17, 2025”

•On March 24, 2025 in a press release titled “Abivax Announces Full Year 2024 Financial Results”

•On March 26, 2025 in a press release titled “Abivax Publishes Financial Reports with the French and U.S. Securities Regulatory Agencies”

•On April 22, 2025 in a press release titled “Abivax Announces Appointment of Dominik Höchli, MD to Board of Directors”

•On April 22, 2025 in a press release titled “Abivax Announces Annual General Meeting Details as Company Advances Toward Key 2025 Value-Driving Milestones”

•On April 29, 2025 in a press release titled “Abivax Announces Completion of Enrollment for the Phase 3 ABTECT Trials in Patients with Moderately to Severely Active Ulcerative Colitis”

First Quarter 2025 Financial Highlights (IFRS figures)

(Consolidated, unaudited results)

Income Statement	Three months ended<br><br>March 31,		Change
in millions of euros	2025	2024
Total operating income	1.0	1.2	-0.2
Total operating expenses
of which Research and Development costs	(39.3)	(35.7)	(3.6)
of which Sales and Marketing costs	(0.9)	(2.0)	1.1
of which General and Administrative costs	(8.0)	(8.1)	0.1
Operating loss	(47.2)	(44.7)	(2.5)
Financial (loss) income	(5.2)	1.8	(7.0)
Net loss for the period	(52.4)	(42.9)	(9.5)
Balance Sheet	March 31, 2025	December 31, 2024	Change
---	---	---	---
in millions of euros
Net financial position	18.5	53.4	(34.9)
of which other current financial assets and other current receivables and assets*	26.3	23.2	2.6
of which available cash and cash equivalents	103.6	144.2	(40.6)
(of which financial liabilities)**	(111.4)	(114.0)	2.6
Total Assets	166.9	205.2	(38.3)
Total Shareholders’ Equity	(6.6)	40.6	(47.2)
* Excluding items of the liquidity contract (liquidity and own shares) and prepaid expenses<br><br>** Financial liabilities include borrowings, convertible loan notes, derivative instruments, royalty certificates and other financial liabilities

•Operating loss increased by EUR 2.5M to EUR -47.2M for the three months ended March 31, 2025 compared to EUR -44.7M for the three months ended March 31, 2024. Operating income, consisting predominantly of Research Tax Credits and Subsidies, decreased by EUR 0.2M to EUR 1.0M for the three months ended March 31, 2025 compared to EUR 1.2M for the three months ended March 31, 2024. The increase in operating loss was driven by operating expenses as described further below.

•Research and development (R&D) expenses increased by EUR 3.6M to EUR -39.3M in the first quarter of 2025 compared to EUR -35.7M in the same period in 2024. This increase was predominantly driven by expenses related to:

◦A EUR 3.0M, or 736% increase related to our Crohn’s Disease (CD) clinical program, driven by the progression of Phase 2b clinical trials for obefazimod in CD;

◦A EUR 2.7M, or 78%, increase in transversal activities related to the overall expansion of the R&D headcount to support our organizational growth and the issuance of new equity awards to officers and employees in R&D; and

◦Partially offset by a decrease of EUR 1.3M, or -4%, related to our Ulcerative Colitis (UC) clinical program as our Phase 3 clinical trials reached full enrollment.

•Sales and marketing (S&M) expenses decreased to EUR -0.9M for the three-month period ended March 31, 2025 compared to EUR -2.0M for the same period in 2024. The decrease was predominantly driven by a reduction in non-critical expenses to manage our cash expense.

•General and administrative (G&A) expenses decreased to EUR -8.0M for the first quarter of 2025 compared to EUR -8.1M for the first quarter of 2024. This decrease was primarily due to:

◦A decrease in personnel costs of EUR 0.6M, resulting from the expense recognition pattern of equity awards granted to certain of our officers and employees, many of which were issued in connection with our U.S. initial public offering and listing on Nasdaq in October 2023;

◦Offset by EUR 0.4M increase related to legal and professional fees and other costs associated with operating as a dual-listed public company.

•For the three-months ended March 31, 2025, our EUR -5.2M net financial loss was driven primarily by the following items:

◦Interest expenses of EUR -3.5M in relation to borrowings and loans;

◦Non-cash expense of EUR -1.0M in relation in relation to our royalty certificates; and

◦Foreign Exchange losses of EUR -1.0M;

◦Mostly offset by interest income of EUR 0.9M in relation to the invested proceeds from our U.S. initial public offering and listing on Nasdaq.

•Cash position as of March 31, 2025 was EUR 103.6M compared to EUR 144.2M as of December 31, 2024. The decrease was due to EUR -33.3M used in operating activities and EUR -7.8M related to principal and interest paid on our debt facilities. This decrease was partially offset by EUR 1.0M of interest received on cash.

Based on the currently available funds and operating assumptions, Abivax expects to be able to finance its operating cash flow requirements into the fourth quarter of 2025.

*****

About Abivax

Abivax is a clinical-stage biotechnology company focused on developing therapeutics that harness the body’s natural regulatory mechanisms to stabilize the immune response in patients with chronic inflammatory diseases. Based in France and the United States, Abivax’s lead drug candidate, obefazimod (ABX464), is in Phase 3 clinical trials for the treatment of moderately to severely active ulcerative colitis. More information on the Company is available at www.abivax.com. Follow us on LinkedIn and on X, formerly Twitter, @ABIVAX.

Contacts:

Abivax Investor Relations

Patrick Malloy

patrick.malloy@abivax.com

+1 847 987 4878

FORWARD-LOOKING STATEMENTS

This press release contains forward-looking statements, forecasts and estimates, including those relating to the Company’s business and financial objectives. Words such as “design,” “expect,” “forward,” “future,” “potential,” “plan,” “project,” “will” and variations of such words and similar expressions are intended to identify forward-looking statements. These forward-looking statements include statements concerning or implying the therapeutic potential of Abivax's drug candidates, Abivax’s cash runway, and other statements that are not historical fact. Although Abivax’s management believes that the expectations reflected in such forward-looking statements are reasonable, investors are cautioned that forward-looking information and statements are subject to various risks, contingencies and uncertainties, many of which are difficult to predict and generally beyond the control of Abivax, that could cause actual results and developments to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. A description of these risks, contingencies and uncertainties can be found in the documents filed by the Company with the French Autorité des Marchés Financiers pursuant to its legal obligations including its universal registration document (Document d’Enregistrement Universel) and in its Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission on March 24, 2025 under the caption “Risk Factors.” These risks, contingencies and uncertainties include among other things, the uncertainties inherent in research and development, future clinical data and analysis, decisions by regulatory authorities, such as the FDA or the EMA, regarding whether and when to approve any drug candidate, as well as their decisions regarding labelling and other matters that could affect the availability or commercial potential of such product candidates. and the availability of funding sufficient for the Company’s foreseeable and unforeseeable operating expenses and capital

expenditure requirements. Special consideration should be given to the potential hurdles of clinical and pharmaceutical development including further assessment by the Company and regulatory agencies and IRBs/ethics committees following the assessment of preclinical, pharmacokinetic, carcinogenicity, toxicity, CMC and clinical data. Furthermore, these forward-looking statements, forecasts and estimates are made only as of the date of this press release. Readers are cautioned not to place undue reliance on these forward-looking statements. Abivax disclaims any obligation to update these forward-looking statements, forecasts or estimates to reflect any subsequent changes that the Company becomes aware of, except as required by law. Information about pharmaceutical products (including products currently in development) that is included in this press release is not intended to constitute an advertisement. This press release is for information purposes only, and the information contained herein does not constitute either an offer to sell, or the solicitation of an offer to purchase or subscribe securities of the Company in any jurisdiction. Similarly, it does not give and should not be treated as giving investment advice. It has no connection with the investment objectives, financial situation or specific needs of any recipient. It should not be regarded by recipients as a substitute for exercise of their own judgment. All opinions expressed herein are subject to change without notice. The distribution of this document may be restricted by law in certain jurisdictions. Persons into whose possession this document comes are required to inform themselves about and to observe any such restrictions.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

For the month of June 2025

Commission file number: 001-41842

Abivax SA

7-11 boulevard Haussmann

75009 Paris, France

Incorporation by Reference

SIGNATURES

Unaudited Interim Condensed Consolidated Financial Statements

TABLE OF CONTENTS

INTRODUCTION

Special Note Regarding Forward-Looking Statements

Rounding of Figures

RISK FACTORS

OPERATING RESULTS

Overview

Results of Operations

Total Operating Income

Other Operating Income

2025.

Research Tax Credits

Total Operating Expenses

Sales and Marketing Expenses

Research and Development Expenses

General and Administrative Expenses

Operating Loss

Financial Income (Loss)

Income Taxes

Net Loss

Liquidity and Capital Resources

Sources of Liquidity

Capital Increases

Research Tax Credits

Bpifrance—Conditional Advances and Subsidies

Bpifrance—CARENA Contract

Bpifrance—RNP-VIR Contract

Bpifrance—Ebola

Indebtedness

Historical Changes in Cash Flows

2025.

Operating Activities

Investing Activities

Financing Activities

Material Cash Requirements

Contractual Obligations and Loans

2025.

€333.0

€109.4

€220.5

F-1

INDEX TO UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

F-2

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

F-3

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF LOSS

F-4

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE

LOSS

F-5

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

F-6

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

F-7

ABIVAX SA NOTES TO THE UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Note 1. The Group

Note 1.1. Information on the Group and its business

Note 1.2. Date of authorization of issuance

Note 2. Basis of preparation

F-8

Statement of compliance

Preparation of the financial statements

Going concern

F-9

2025.