SEC Form NT 10-Q filed by Allurion Technologies Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 12b-25

NOTIFICATION OF LATE FILING

If the notification relates to a portion of the filing checked above, identify the Item(s) to which the notification relates: N/A

PART I — REGISTRANT INFORMATION

ALLURION TECHNOLOGIES, INC.

(Full Name of Registrant)

Not Applicable

(Former Name if Applicable)

11 Huron Drive

(Address of Principal Executive Office (Street and Number))

Natick, Massachusetts 01760

(City, State and Zip Code)

PART II — RULES 12b-25(b) AND (c)

If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate)

PART III — NARRATIVE

State below in reasonable detail the reasons why Forms 10-K, 20-F, 11-K, 10-Q, 10-D, N-CEN, N-CSR, or the transition report or portion thereof, could not be filed within the prescribed time period.

Allurion Technologies, Inc. (the “Company”) is unable, without unreasonable effort or expense, to file its Quarterly Report on Form 10-Q for the quarter ended September 30, 2025 (the “Form 10-Q”) by the November 14, 2025 filing date applicable to a non-accelerated filer for the reasons discussed in this Form 12b-25.

The Company needed additional time beyond the original filing deadline for the Form 10-Q to complete its preparation and review of items that occurred subsequent to quarter end. As of the date of this notification of late filing, such preparation and review have been completed. The Company expects to file the Form 10-Q on the date hereof, which is within the five-day extension period provided by filing this notification.

PART IV — OTHER INFORMATION

Cautionary Note on Forward-Looking Statements

This Form 12b-25 includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act. All statements, other than statements of historical fact, included in this Form 12b-25 are forward-looking statements, including statements regarding the Company’s expectations regarding the timing of the filing with the SEC of the Form 10-Q. Such forward looking statements may be identified by, among other things, the use of forward-looking terminology such as “believe,” “expect,” “may,” “could,” “would,” “plan,” “intend,” “estimate,” “predict,” “potential,” “continue,” “should” or “anticipate” or the negative thereof or other variations thereon or comparable terminology.

Forward-looking statements are based on beliefs and assumptions by management and the Board of Directors of the Company (the “Board”), and on information currently available to the Board and management. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statement. Potential consequences of the matters discussed in this Form 12b-25 include, but are not limited to: the risk that the completion and filing of the Form 10-Q will take longer than expected and will not be completed by the extension period provided by Rule 12b-25 of the Securities Exchange Act of 1934, as amended; the possibility that the New York Stock Exchange may delist the Company’s securities; the possibility that the Company will become delinquent in its filings with the SEC; the risk of investigations or actions by governmental authorities or regulators and the consequences thereof, including the imposition of civil or criminal penalties; and the risk that the Company may become subject to stockholder lawsuits or claims. It is very difficult to predict the effect of known factors, and the Company cannot anticipate all factors that could affect actual results that may be important to an investor. All

forward-looking information should be evaluated in the context of these risks, uncertainties and other factors, including those factors disclosed under “Risk Factors” in the Company’s Annual Report on Form 10-K filed with the SEC on March 27, 2025, as amended, and the Company’s subsequent reports filed with the SEC.

All forward-looking statements in this Form 12b-25 are based on information available to the Company as of the date hereof. The Company undertakes no obligation to revise or publicly release the results of any revision to these forward-looking statements, except as required by law. Given these risks and uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements.

ALLURION TECHNOLOGIES, INC.

(Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.