Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * RTW INVESTMENTS, LP 2. Issuer Name and Ticker or Trading Symbol ALLURION TECHNOLOGIES, INC. [ALUR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 40 10TH AVENUE, 7TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 11/05/2025 (Street) NEW YORK, NY 10014 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, $0.0001 par value per share 11/05/2025 C 822,722 A $3.35 2,147,254 I See footnotes(1)(2) Common Stock, $0.0001 par value per share 11/05/2025 C 631,954 A $3.35 1,659,241 I See footnotes(1)(3) Common Stock, $0.0001 par value per share 11/05/2025 C 37,863 A $3.35 202,096 I See footnotes(1)(4) Common Stock, $0.0001 par value per share 26,551 I See footnotes(1)(4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Convertible Note

$3.35

11/05/2025

A

$2,756,117

(5)(6)

04/16/2031

Common Stock

822,722

$2,756,117

$2,756,117

I

See Footnotes(1)(2)

Convertible Note

$3.35

11/05/2025

C

$2,756,117

(5)(6)

04/16/2031

Common Stock

822,722

$2,756,117

$ 0

I

See Footnotes(1)(2)

Convertible Note

$3.35

11/05/2025

A

$2,117,044

(5)(6)

04/16/2031

Common Stock

631,954

$2,117,044

$2,117,044

I

See footnotes(1)(3)

Convertible Note

$3.35

11/05/2025

C

$2,117,044

(5)(6)

04/16/2031

Common Stock

631,954

$2,117,044

0

I

See footnotes(1)(3)

Convertible Note

$3.35

11/05/2025

A

$126,839

(5)(6)

04/16/2031

Common Stock

37,863

$126,839

$126,839

I

See footnotes(1)(4)

Convertible Note

$3.35

11/05/2025

C

$126,839

(5)(6)

04/16/2031

Common Stock

37,863

$126,839

$ 0

I

See footnotes(1)(4)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
RTW INVESTMENTS, LP 40 10TH AVENUE, 7TH FLOOR NEW YORK, NY 10014	X	X
WONG RODERICK 40 10TH AVENUE, 7TH FLOOR NEW YORK, NY 10014	X	X
RTW MASTER FUND, LTD. 40 10TH AVENUE, 7TH FLOOR NEW YORK, NY 10014	X	X
RTW Innovation Master Fund Ltd. 40 10TH AVENUE, 7TH FLOOR NEW YORK, NY 10014	X	X

Signatures

/s/ Roderick Wong, M.D. - For RTW Investments, L.P., By: Roderick Wong, M.D., Managing Partner		11/07/2025
**Signature of Reporting Person		Date
/s/ Roderick Wong, M.D.		11/07/2025
**Signature of Reporting Person		Date
/s/ Darshan Patel - For RTW Master Fund, Ltd., By Darshan Patel, Director		11/07/2025
**Signature of Reporting Person		Date
/s/ Darshan Patel - For RTW Innovation Master Fund, Ltd., By Darshan Patel, Director		11/07/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	RTW Investments, LP (the "Adviser") manages certain funds that directly hold the securities reported herein, including RTW Master Fund, Ltd. ("Master Fund"), RTW Innovation Master Fund, Ltd. ("RTW Innovation") and other funds or accounts managed by the Adviser (each, an "Other RTW Fund"). Roderick Wong, M.D. serves as the Managing Partner and Chief Investment Officer of the Adviser. Each Reporting Person disclaims beneficial ownership of the securities reported on this Form 4 except to the extent of its or his pecuniary interest, if any, therein, and this report shall not be deemed to be an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.
(2)	Held directly by Master Fund.
(3)	Held directly by RTW Innovation.
(4)	Held by an Other RTW Fund.
(5)	On November 5, 2025, pursuant to the terms of that certain Note Purchase Agreement dated April 14, 2024 as amended through April 15, 2025 (the "Amended Note Purchase Agreement"), the Reporting Persons delivered, and the Issuer accepted, conversion notices to convert $5.0 million aggregate principal amount of the convertible senior secured notes (the "Notes") held by the Reporting Persons at the floor conversion price of $3.35 per share. The remaining outstanding amount of the Notes remains convertible at a conversion price of $40.50 per share, as well as additional conversion prices in the discretion of the Issuer (the "Discretionary Conversions").
(6)	The Notes bear interest at an annual rate of 6.0%, which is payable quarterly in cash, or, at the Issuer's option, in kind for the first three years. The reported amount of shares does not give effect to any increase in principal amount as a result of PIK interest payments. The maturity date of the Notes is April 16, 2031. Pursuant to the Amended Note Purchase Agreement, the RTW Funds may not convert the Notes to the extent that such conversion would result in the RTW Funds beneficially owning more than 9.99% of the Issuer's common stock after giving effect to such conversion, unless converted pursuant to a Discretionary Conversion.
Remarks: Pursuant to the terms of the Amended Note Purchase Agreement, RTW Investments, LP has the right to designate two members of the Issuer's board of directors (the "Board"), and has designated Keith Johns and R. Jason Richey to the Board. Mr. Richey is a consultant of RTW Investments.

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