8-K

UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Allurion Technologies, Inc.

(Exact name of Registrant as Specified in Its Charter)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition.

On January 12, 2026, Allurion Technologies, Inc. issued a press release announcing selected preliminary financial results for the quarter and year ended December 31, 2025. The full text of that press release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by reference.

The information contained in this Item 2.02 of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, is intended to be furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

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 hereunto duly authorized.

EX-99.1

Exhibit 99.1

Allurion Announces Preliminary Fourth Quarter and Full-Year 2025 Results

Strong quarter-over-quarter revenue growth with continued, substantial improvement in operating expenses and operating loss

NATICK, Mass. – January 12, 2026 – Allurion Technologies, Inc. (NYSE: ALUR), a pioneer in metabolically healthy weight loss, today announced preliminary, unaudited results for the fourth quarter and full year 2025. Management expects preliminary, unaudited results for the period as follows:

• Fourth quarter revenue of $3.3 million to $3.7 million, a 22% to 37% increase quarter-over-quarter, and full-year revenue of approximately $15 million
• Substantial improvement in operating expenses and operating loss quarter-over-quarter and as compared to prior year

“We are pleased with our results from the fourth quarter, where we grew revenue meaningfully quarter-over-quarter for the first time in more than one year as our new commercial strategy implemented after our strategic pivot in 2025 began to take hold,” said Dr. Shantanu Gaur, Founder and Chief Executive Officer. “We have also continued to reduce our operating losses through a sharpening of our strategic focus, and, with that, I believe we have set ourselves up for an even more efficient 2026. With a potential FDA approval of our Allurion Smart Capsule on the horizon, I believe 2026 will be a historic year for Allurion.”

About Allurion Allurion is a pioneer in metabolically healthy weight loss. The Allurion Program is a weight-loss platform that combines the Allurion Smart Capsule, the world’s first and only swallowable, ProcedurelessTM gastric balloon for weight loss, the Allurion Virtual Care Suite, including the Allurion Mobile App for consumers and Allurion Insights for healthcare providers featuring the Iris AI Platform, and the Allurion Connected Scale. The Allurion Virtual Care Suite is also available to providers separately from the Allurion Program to help customize, monitor, and manage weight-loss therapy for patients regardless of their treatment plan. The Allurion Smart Capsule is an investigational device in the United States.

For more information about Allurion and the Allurion Virtual Care Suite, please visit www.allurion.com.

Allurion is a trademark of Allurion Technologies, Inc. in the United States and countries around the world.

Estimated Preliminary Results for the Fourth Quarter and Fiscal Year Ended December 31, 2025 (Unaudited)

Set forth above are certain estimated preliminary financial results and other key business metrics for the fourth quarter and fiscal year ended December 31, 2025. These estimates are based on the information available to us at this time. Our actual results may vary from the estimated preliminary results presented here due to the completion of our financial closing procedures, final adjustments and other developments that may arise between now and the time the financial results for the fourth quarter ended December 31, 2025 are finalized. The estimated preliminary financial results and other key business metrics have not been audited or reviewed by our independent registered public accounting

firm. These estimates should not be viewed as a substitute for our full, interim, or annual financial statements. Accordingly, you should not place undue reliance on this preliminary data.

Forward-Looking Statements

This press release contains forward-looking statements that reflect Allurion’s beliefs and assumptions based on information currently available. In some cases, you can identify forward-looking statements by the following words: “may,” “will,” “could,” “would,” “should,” “expect,” “intend,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “project,” “potential,” “continue,” “ongoing” or the negative of these terms or other comparable terms, although not all forward-looking statements contain these words. Although Allurion believes it has a reasonable basis for each forward-looking statement contained in this release, these statements involve risks and uncertainties that may cause actual results, levels of activity, performance or achievements to be materially different from the information expressed or implied by these forward-looking statements.

Forward-looking statements in this press release include, but are not limited to, statements regarding: establishing a new standard for weight loss; pioneering in metabolically healthy weight loss; enhancing short and long-term operational and financial results; receiving FDA approval of the Allurion Smart Capsule; and other statements about future events that reflect the current beliefs and assumptions of Allurion’s management based on information currently available to management.

Allurion cannot assure you that the forward-looking statements in this press release will prove to be accurate. These forward looking statements are subject to a number of risks and uncertainties, including, among others, general economic, political and business conditions; the ability of Allurion to obtain and maintain regulatory approval for, and successfully commercialize, the Allurion Program, including the Allurion Balloon; the timing of, and results from, Allurion’s clinical studies and trials, including with respect to the combination of GLP-1s with the Allurion Balloon; the evolution of the markets in which Allurion competes, including the impact of GLP-1 drugs; the ability of Allurion to maintain its listing on the New York Stock Exchange; a changing regulatory landscape in the highly competitive industry in which Allurion competes; the impact of the imposition of current and potential tariffs and trade negotiations, and those factors discussed under the heading “Risk Factors” in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on March 27, 2025, and as amended on August 19, 2025, and updated from time to time by its other filings with the SEC, and its Quarterly Report on Form 10-Q filed with the SEC on November 17, 2025. Undue reliance should not be placed on forward-looking statements, which speak only as of the date they are made. Allurion undertakes no obligation to update any forward-looking statements to reflect any new information, events, or circumstances after the date they are made, or to reflect the occurrence of unanticipated events, other than as required by applicable law.

Media Contact press@allurion.com

Investor Contact investors@allurion.com