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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13D/A 0000902664-23-004381 0001493215 XXXXXXXX LIVE 11 Common Stock, par value $0.0001 per share 02/26/2026 false 0001964979 02008G201 ALLURION TECHNOLOGIES, INC. 11 Huron Drive Natick MA 01760 Roderick Wong, M.D. (646) 597-6980 RTW Investments, LP 40 10th Avenue, Floor 7 New York NY 10014 0001493215 N RTW Investments, LP AF N DE 0.00 5891430.00 0.00 5891430.00 5891430.00 N 39.4 IA PN 0001493219 N RTW Master Fund, Ltd. WC N E9 0.00 3138798.00 0.00 3138798.00 3138798.00 N 21.0 CO 0001776733 N RTW Innovation Master Fund, Ltd. WC N E9 0.00 2427089.00 0.00 2427089.00 2427089.00 N 16.2 CO 0001493280 N Roderick Wong AF N X1 0.00 5891430.00 0.00 5891430.00 5891430.00 N 39.4 HC IN Common Stock, par value $0.0001 per share ALLURION TECHNOLOGIES, INC. 11 Huron Drive Natick MA 01760 Items 5(a)-(c) of the Schedule 13D are hereby amended and supplemented as follows: The aggregate percentage of Shares reported to be beneficially owned by the Reporting Persons is based upon the sum of (i) 12,279,181 Shares outstanding as of January 5, 2026 as reported in the Issuer's prospectus dated January 16, 2026 filed with the Securities and Exchange Commission (the "SEC") on January 20, 2026 and (ii) 2,659,565 Shares issued pursuant to an Inducement Offer to Exercise Common Stock Purchase Warrants dated February 24, 2026, which closed on February 26, 2026. See rows (7) through (10) of the cover pages to this Schedule 13D/A for the number of shares of Common Stock as to which each Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition. No transactions with respect to the securities of the Issuer have been effected during the past sixty days by any Reporting Person. The percentage ownership reported in this Schedule 13D/A reflect an increase in the number of outstanding shares of the Issuer. RTW Investments, LP /s/ Roderick Wong, M.D. Roderick Wong, M.D., Managing Partner 03/02/2026 RTW Master Fund, Ltd. /s/ Darshan Patel Darshan Patel, Director 03/02/2026 RTW Innovation Master Fund, Ltd. /s/ Darshan Patel Darshan Patel, Director 03/02/2026 Roderick Wong /s/ Roderick Wong, M.D. Roderick Wong, M.D. 03/02/2026