Supplemental Prospectus - Form 424B3

Filed Pursuant to Rule 424(b)(3)

Registration No. 333-274564

Prospectus Supplement No. 9

(To Prospectus dated December 15, 2023)

ALLURION TECHNOLOGIES, INC.

Up to 56,548,268 Shares of Common Stock

This prospectus supplement no. 9 (this "Prospectus Supplement") amends and supplements the prospectus dated December 15, 2023 (as supplemented or amended from time to time, the "Prospectus") which forms part of our Registration Statement on Form S-1/A (Registration Statement No. 333-274564). This Prospectus Supplement is being filed to update and supplement the information included or incorporated by reference in the Prospectus with the information contained in our Current Reports on Form 8-K, filed with the Securities and Exchange Commission (the "SEC") on September 4, 2024 and September 5, 2024, respectively (the "8-Ks"). Accordingly, we have attached the 8-Ks to this Prospectus Supplement.

This Prospectus Supplement updates and supplements the information in the Prospectus and is not complete without, and may not be delivered or utilized except in combination with, the Prospectus, including any amendments or supplements thereto. This Prospectus Supplement should be read in conjunction with the Prospectus, and if there is any inconsistency between the information in the Prospectus and this Prospectus Supplement, you should rely on this Prospectus Supplement.

Our common stock is listed on The New York Stock Exchange ("NYSE") under the symbol "ALUR" and our public warrants are listed on the NYSE under the symbol "ALUR.WS". On September 4, 2024, the last quoted sale price for shares of our common stock as reported on the NYSE was $0.6230 per share, and the last quoted sale price for our public warrants as reported on the NYSE was $0.0800 per warrant.

We are an "emerging growth company" under applicable federal securities laws and will be subject to reduced public company reporting requirements.

Investing in our securities involves a high degree of risk. Before buying any securities, you should carefully read the discussion of the risks of investing in our securities in "Risk Factors" beginning on page 26 of the Prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the securities to be issued under the Prospectus or determined if the Prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this Prospectus Supplement is September 5, 2024.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 02, 2024

Allurion Technologies, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware		001-41767		92-2182207
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(IRS Employer Identification No.)
11 Huron Drive
Natick, Massachusetts		01760
(Address of Principal Executive Offices)		(Zip Code)

Registrant's Telephone Number, Including Area Code: (508) 647-4000

Not Applicable

(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:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common stock, par value $0.0001 per share		ALUR		The New York Stock Exchange
Warrants to purchase 1.420455 shares of common stock, each at an exercise price of $8.10 per share of common stock		ALUR WS		The New York Stock Exchange

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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On September 2, 2024, the Board of Directors (the "Board") of Allurion Technologies, Inc. ("Allurion" or the "Company") appointed Keith Johns to the Board as a Class III director to fill a vacancy created by an increase in the size of the Board from seven members to eight members, effective September 2, 2024.

Mr. Johns' compensation for his service as a non-employee director is anticipated to be consistent with the Company's compensation practices for non-employee directors described in the Company's Registration Statement on Form S-4/A filed with the SEC on July 6, 2023, under the caption "Allurion Non-Employee Director Compensation Policy."

There is no arrangement or understanding between Mr. Johns and any other person pursuant to which he was to be selected as a director of the Company, and he is a not a party to, and has no direct or indirect interest in, any transactions or proposed transactions to which the Company is or will be a participant.

A copy of the press release dated September 3, 2024, announcing such appointment is attached as Exhibit 99.1.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit		Description
99.1		Press Release issued by the registrant on September 3, 2024, furnished herewith.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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.

		ALLURION TECHNOLOGIES, INC.
Date:  September 4, 2024			By:		/s/ Brendan Gibbons
		Name:		Brendan Gibbons
		Title:		Chief Legal Officer

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 29, 2024

Allurion Technologies, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware		001-41767		92-2182207
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(IRS Employer Identification No.)
11 Huron Drive Natick, Massachusetts			01760
(Address of Principal Executive Offices)			(Zip Code)

Registrant's Telephone Number, Including Area Code: (508) 647-4000

Not Applicable

(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:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common stock, par value $0.0001 per share		ALUR		The New York Stock Exchange
Warrants to purchase 1.420455 shares of common stock, each at an exercise price of $8.10 per share of common stock		ALUR WS		The New York Stock Exchange

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 3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On August 29, 2024, Allurion Technologies, Inc. (the "Company") received written notice (the "Notice") from the New York Stock Exchange (the "NYSE") that it is not in compliance with the continued listing standard set forth in Section 802.01B of the NYSE's Listed Company Manual (the "Minimum Market Capitalization Standard") because the average market capitalization of the Company was less than $50.0 million over the consecutive 30 trading-day period ended August 29, 2024 and the Company's last reported stockholders' equity as of August 29, 2024 was less than $50.0 million. The Notice does not result in the immediate delisting of the Company's common stock from the NYSE.

In accordance with applicable NYSE procedures, within 45 days from receipt of the Notice, the Company intends to submit a plan to the NYSE advising it of the definitive action(s) the Company has taken, is taking, or plans to take that would bring it into conformity with the Minimum Market Capitalization Standard within 18 months of receipt of the Notice (the "Cure Period"). Upon receipt of such plan, the NYSE will evaluate the plan and determine whether the Company has made a reasonable demonstration of its ability to come into conformity with the relevant listing standards within the Cure Period. If the NYSE accepts the Company's plan, the NYSE will review the Company on a quarterly basis to confirm compliance with the plan. If the Company's plan is not accepted, the Company fails to comply with the plan or does not meet the Minimum Market Capitalization Standard at the end of the Cure Period, it will be subject to NYSE's prompt initiation of suspension and delisting procedures.

The Notice has no immediate impact on the listing of the Company's common stock, which will continue to be listed and traded on the NYSE during such cure period, subject to the Company's compliance with other NYSE continued listing standards. The Company's common stock will continue to trade on the NYSE under the symbol "ALUR" with the designation of ".BC" to indicate the status of the shares as "below criteria." If the Company does not regain compliance with the Minimum Market Capitalization Standard, the Company's common stock will be subject to suspension and delisting from the NYSE. If the Company's common stock ultimately were to be delisted, it could negatively impact the Company by reducing the liquidity and market price of the Company's common stock. Furthermore, the Notice is not anticipated to impact the ongoing business operations of the Company or its reporting requirements with the U.S. Securities and Exchange Commission.

The Company had previously received a notice on August 12, 2024 that the Company was not in compliance with NYSE's minimum average closing price listing requirement in Section 802.01A of the NYSE Listed Company Manual.

Cautionary Note Regarding Forward-Looking Statements

This Current Report on Form 8-K contains forward-looking statements within the meaning of the U.S. federal and state securities laws. These forward-looking statements generally are identified by the words "believe," "project," "expect," "anticipate," "estimate," "intend," "strategy," "future," "opportunity," "plan," "may," "should," "will," "would," "will be," "will continue," "will likely result," and similar expressions and include statements regarding the Company's plans to notify the NYSE that it intends to cure the market capitalization deficiency and return to compliance with the applicable NYSE continued listing standards, its intention to remain listed on the NYSE, and its options to regain compliance with the NYSE's continued listing standards. Forward-looking statements are predictions, projections and other statements about future events that reflect the current beliefs and assumptions of the Company's management based on information currently available to them and, as a result, are subject to risks and uncertainties. Many factors could cause actual future results or developments to differ materially from the forward-looking statements in this communication, including but not limited to (i) the ability of the Company to obtain and maintain regulatory approvals for and successfully commercialize its products and offerings, including the Allurion Balloon, (ii) the timing of, and results from, the Company's clinical studies and trials, (iii) the evolution of the markets in which the Company competes, (iv) the ability of the Company to defend its intellectual property and satisfy regulatory requirements, (v) the impact of global economic conditions and geopolitical events on the Company's business, (vi) the Company's expectations regarding its market opportunities, (vii) the risk of economic downturns and a changing regulatory landscape in the highly competitive industry in which the Company operates, (viii) the risk that the Notice and noncompliance with NYSE continued listing standards may impact the Company's results of operations, business operations and reputation and the trading prices and volatility of the Company's common stock, and (ix) the Company's ability to continue to meet NYSE continued listing standards. The foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties described in the "Risk Factors" section of the Company's Annual Report on Form 10-K filed on March 26, 2024 (as subsequently amended) and other documents filed by the Company from time to time with the U.S. Securities and Exchange Commission. These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise. The Company does not give any assurance that it will achieve its expectations.

Item 7.01 Regulation FD Disclosure.

As required by Section 802.01B, the Company issued a press release on September 5, 2024, announcing that it had received the notice of noncompliance with the NYSE's continued listing standards. A copy of the press release is being furnished herewith as Exhibit 99.1.

Item 9.01 Financial Statements and Exhibits.

(d)

Exhibits

Exhibit		Description
99.1		Press Release of Allurion Technologies, Inc., dated September 5, 2024.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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.

			ALLURION TECHNOLOGIES, INC.
Date: September 5, 2024			By:		/s/ Brendan Gibbons
		Name: Title:		Brendan Gibbons Chief Legal Officer