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SCHEDULE 13D/A 0000902664-23-004381 0001493215 XXXXXXXX LIVE 9 Common Stock, par value $0.0001 per share 11/05/2025 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 4035142.00 0.00 4035142.00 4035142.00 N 43.6 IA PN 0001493219 N RTW Master Fund, Ltd. WC N E9 0.00 2147254.00 0.00 2147254.00 2147254.00 N 23.2 CO 0001776733 N RTW Innovation Master Fund, Ltd. WC N E9 0.00 1659241.00 0.00 1659241.00 1659241.00 N 17.9 CO 0001493280 N Roderick Wong AF N X1 0.00 4035142.00 0.00 4035142.00 4035142.00 N 43.6 HC IN Common Stock, par value $0.0001 per share ALLURION TECHNOLOGIES, INC. 11 Huron Drive Natick MA 01760 Item 3 of the Schedule 13D is hereby amended and supplemented as follows: The information set forth in Item 5(c) of this Amendment No. 9 is incorporated by reference herein to this Item 3. Item 4 of the Schedule 13D is hereby amended and supplemented as follows: The information set forth in Item 5(c) of this Amendment No. 9 is incorporated by reference herein to this Item 4. 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 (i) 7,762,681 Shares outstanding as of August 8, 2025, as disclosed in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 19, 2025, and (ii) an additional 1,492,539 Shares issued pursuant to the November 2025 Conversion Notice (as defined in Item 6). The remaining principal amount of the Notes are subject to a beneficial ownership conversion limitation such that the RTW Funds cannot convert Notes to the extent it would result in the RTW Funds and their affiliates beneficially owning more than 9.99% of the Issuer's Shares, except as described in Item 6 hereof. The Warrants held by the RTW Funds are subject to a Blocker (as defined in Item 4 of Amendment No. 2 to the Schedule 13D), which is currently set at 4.99% and can be increased to 9.99% upon 61 days' prior notice by RTW. See rows (7) through (10) of the cover pages to this Schedule 13D 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. On November 5, 2025, the RTW Funds delivered the November 2025 Conversion Notice to acquire 1,492,539 Shares. Other than as reported herein, the Reporting Persons did not effect any transactions with respect to the Shares during the past sixty (60) days. Item 6 of the Statement is hereby amended and supplemented as follows: On November 5, 2025, pursuant to the terms of the Amended Note Purchase Agreement, the RTW Funds provided the Company with, and the Company accepted, a conversion notice (the "November 2025 Conversion Notice"), pursuant to which $5.0 million aggregate principal amount of the Notes was converted into an aggregate of 1,492,539 Shares. RTW Investments, LP /s/ Roderick Wong, M.D. Roderick Wong, M.D., Managing Partner 11/07/2025 RTW Master Fund, Ltd. /s/ Roderick Wong, M.D. Roderick Wong, M.D., Director 11/07/2025 RTW Innovation Master Fund, Ltd. /s/ Roderick Wong, M.D. Roderick Wong, M.D., Director 11/07/2025 Roderick Wong /s/ Roderick Wong, M.D. Roderick Wong, M.D. 11/07/2025