{"transactions":[{"id":703990,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Pre-Funded Warrant (Right to Buy)","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":true,"shares":1771,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F8","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which Other RTW Fund exchanged, for no additional consideration, 1,771 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 1,771 shares of the Issuer's Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which Other RTW Fund exchanged, for no additional consideration, 1,771 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 1,771 shares of the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Held by an Other RTW Fund."}],"balance_after":1771,"derivative":{"exercise_price":0.0001,"underlying":"Common Stock","underlying_shares":1771},"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":703989,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Pre-Funded Warrant (Right to Buy)","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":true,"shares":19934,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F6","text":"On July 21, 2026, RTW  Biotech Fund entered into an Exchange Agreement with the Issuer pursuant to which the RTW  Biotech Fund exchanged, for no additional consideration, 19,934 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 19,934 shares of  the Issuer's Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"On July 21, 2026, RTW  Biotech Fund entered into an Exchange Agreement with the Issuer pursuant to which the RTW  Biotech Fund exchanged, for no additional consideration, 19,934 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 19,934 shares of  the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"Held directly by RTW Biotech Fund."}],"balance_after":19934,"derivative":{"exercise_price":0.0001,"underlying":"Common Stock","underlying_shares":19934},"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":703988,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Pre-Funded Warrant (Right to Buy)","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":true,"shares":161807,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which the RTW Innovation exchanged, for no additional consideration, 161,807 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for  161,807 shares of  the Issuer's Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which the RTW Innovation exchanged, for no additional consideration, 161,807 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for  161,807 shares of  the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Held directly by RTW Innovation."}],"balance_after":161807,"derivative":{"exercise_price":0.0001,"underlying":"Common Stock","underlying_shares":161807},"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":703987,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Pre-Funded Warrant (Right to Buy)","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":true,"shares":209254,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On July 21, 2026, RTW Master Fund, Ltd. (\"Master Fund\") entered into an Exchange Agreement with the Issuer pursuant to which the Master Fund exchanged, for no additional consideration, 209,254 shares of the Issuer's Common Stock for a pre-funded warrant exercisable for up to 209,254 shares of the Issuer's Common Stock at an exercise price of $0.0001 per share (a \"Pre-Funded Warrant\")."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On July 21, 2026, RTW Master Fund, Ltd. (\"Master Fund\") entered into an Exchange Agreement with the Issuer pursuant to which the Master Fund exchanged, for no additional consideration, 209,254 shares of the Issuer's Common Stock for a pre-funded warrant exercisable for up to 209,254 shares of the Issuer's Common Stock at an exercise price of $0.0001 per share (a \"Pre-Funded Warrant\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Pre-Funded Warrant has no expiration date and is exercisable immediately. Notwithstanding the foregoing, the holder shall not be entitled to exercise the Pre-Funded Warrant to the extent that it would cause the aggregate number of shares of Common Stock beneficially owned by the holder, together with its Attribution Parties (as defined in the Pre-Funded Warrant), to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by Master Fund."}],"balance_after":209254,"derivative":{"exercise_price":0.0001,"underlying":"Common Stock","underlying_shares":209254},"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":703986,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":false,"shares":1771,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F8","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which Other RTW Fund exchanged, for no additional consideration, 1,771 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 1,771 shares of the Issuer's Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which Other RTW Fund exchanged, for no additional consideration, 1,771 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 1,771 shares of the Issuer's Common Stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Held by an Other RTW Fund."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":703985,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":false,"shares":19934,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F6","text":"On July 21, 2026, RTW  Biotech Fund entered into an Exchange Agreement with the Issuer pursuant to which the RTW  Biotech Fund exchanged, for no additional consideration, 19,934 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 19,934 shares of  the Issuer's Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"On July 21, 2026, RTW  Biotech Fund entered into an Exchange Agreement with the Issuer pursuant to which the RTW  Biotech Fund exchanged, for no additional consideration, 19,934 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for 19,934 shares of  the Issuer's Common Stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"Held directly by RTW Biotech Fund."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":703984,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":false,"shares":161807,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which the RTW Innovation exchanged, for no additional consideration, 161,807 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for  161,807 shares of  the Issuer's Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"On July 21, 2026, RTW Innovation entered into an Exchange Agreement with the Issuer pursuant to which the RTW Innovation exchanged, for no additional consideration, 161,807 shares of the Issuer's Common Stock for a Pre-Funded Warrant exercisable for  161,807 shares of  the Issuer's Common Stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Held directly by RTW Innovation."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":703983,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2026-07-23T21:10:27.000Z","date":"2026-07-21","kind":"other","planned":false,"acquired":false,"shares":209254,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On July 21, 2026, RTW Master Fund, Ltd. (\"Master Fund\") entered into an Exchange Agreement with the Issuer pursuant to which the Master Fund exchanged, for no additional consideration, 209,254 shares of the Issuer's Common Stock for a pre-funded warrant exercisable for up to 209,254 shares of the Issuer's Common Stock at an exercise price of $0.0001 per share (a \"Pre-Funded Warrant\")."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On July 21, 2026, RTW Master Fund, Ltd. (\"Master Fund\") entered into an Exchange Agreement with the Issuer pursuant to which the Master Fund exchanged, for no additional consideration, 209,254 shares of the Issuer's Common Stock for a pre-funded warrant exercisable for up to 209,254 shares of the Issuer's Common Stock at an exercise price of $0.0001 per share (a \"Pre-Funded Warrant\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported herein, including the Master Fund, RTW Innovation Master Fund, Ltd. (\"RTW Innovation\"), RTW Biotech Opportunities Operating Ltd. (\"RTW Biotech Fund\") 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by Master Fund."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001231919-26-000786","document":"form4-07232026_090723.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493215/000123191926000786/form4-07232026_090723.xml","form_type":"4"}},{"id":900922,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":66196,"kind":"person","name":"Gibbons Brendan M.","position":1,"cik":"0001484631","reported_name":"Gibbons Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Legal Officer"}}],"security":"Common Stock","published_at":"2026-02-17T17:10:48.000Z","date":"2025-11-08","kind":"tax_withholding","planned":false,"acquired":false,"shares":1862,"price":1.55,"value":2886.1,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On January 3, 2025, the Issuer effected a 1-for-25 reverse stock split of its common stock, par value $0.0001 per share (the \"Reverse Stock Split\"). The number of securities reported herein have been adjusted to reflect the Reverse Stock Split."}],"balance_after":10408,"source":{"system":"sec-edgar","filing":"0001193125-26-055067","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1484631/000119312526055067/ownership.xml","form_type":"5"}},{"id":901420,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":66238,"kind":"person","name":"Buch Ojas","position":1,"cik":"0002026004","reported_name":"Buch Ojas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-02-17T17:09:02.000Z","date":"2025-11-08","kind":"tax_withholding","planned":false,"acquired":false,"shares":2047,"price":1.55,"value":3172.85,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On January 3, 2025, the Issuer effected a 1-for-25 reverse stock split of its common stock, par value $0.0001 per share (the \"Reverse Stock Split\"). The number of securities reported herein have been adjusted to reflect the Reverse Stock Split."}],"balance_after":10223,"source":{"system":"sec-edgar","filing":"0001193125-26-055054","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2026004/000119312526055054/ownership.xml","form_type":"5"}},{"id":978826,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":72142,"kind":"person","name":"Davin Michael R","position":1,"cik":"0001345975","reported_name":"Davin Michael R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-05T19:23:17.000Z","date":"2025-12-04","kind":"sale","planned":false,"acquired":false,"shares":1606,"price":1.5821,"value":2540.8526,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held by Davin Family Nominee Trust u/a 4/16/04 (\"Davin Family Trust\"), of which the Reporting Person and his spouse serve as trustees. The Reporting Person disclaims Section 16 beneficial ownership of the securities held by the Davin Family Trust, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-25-310088","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1345975/000119312525310088/ownership.xml","form_type":"4"}},{"id":978825,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":72142,"kind":"person","name":"Davin Michael R","position":1,"cik":"0001345975","reported_name":"Davin Michael R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-05T19:23:17.000Z","date":"2025-12-03","kind":"sale","planned":false,"acquired":false,"shares":1606,"price":1.48,"value":2376.88,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held by Davin Family Nominee Trust u/a 4/16/04 (\"Davin Family Trust\"), of which the Reporting Person and his spouse serve as trustees. The Reporting Person disclaims Section 16 beneficial ownership of the securities held by the Davin Family Trust, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose."}],"balance_after":1606,"source":{"system":"sec-edgar","filing":"0001193125-25-310088","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1345975/000119312525310088/ownership.xml","form_type":"4"}},{"id":978824,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":72142,"kind":"person","name":"Davin Michael R","position":1,"cik":"0001345975","reported_name":"Davin Michael R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-05T19:23:17.000Z","date":"2025-11-26","kind":"gift","planned":false,"acquired":true,"shares":2608,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held by Davin Family Nominee Trust u/a 4/16/04 (\"Davin Family Trust\"), of which the Reporting Person and his spouse serve as trustees. The Reporting Person disclaims Section 16 beneficial ownership of the securities held by the Davin Family Trust, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose."}],"balance_after":3212,"source":{"system":"sec-edgar","filing":"0001193125-25-310088","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1345975/000119312525310088/ownership.xml","form_type":"4"}},{"id":978823,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":72142,"kind":"person","name":"Davin Michael R","position":1,"cik":"0001345975","reported_name":"Davin Michael R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-05T19:23:17.000Z","date":"2025-11-26","kind":"gift","planned":false,"acquired":false,"shares":2608,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1206,"source":{"system":"sec-edgar","filing":"0001193125-25-310088","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1345975/000119312525310088/ownership.xml","form_type":"4"}},{"id":978822,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":72142,"kind":"person","name":"Davin Michael R","position":1,"cik":"0001345975","reported_name":"Davin Michael R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-05T19:23:17.000Z","date":"2025-10-03","kind":"gift","planned":false,"acquired":true,"shares":604,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held by Davin Family Nominee Trust u/a 4/16/04 (\"Davin Family Trust\"), of which the Reporting Person and his spouse serve as trustees. The Reporting Person disclaims Section 16 beneficial ownership of the securities held by the Davin Family Trust, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose."}],"balance_after":604,"source":{"system":"sec-edgar","filing":"0001193125-25-310088","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1345975/000119312525310088/ownership.xml","form_type":"4"}},{"id":978821,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":72142,"kind":"person","name":"Davin Michael R","position":1,"cik":"0001345975","reported_name":"Davin Michael R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-05T19:23:17.000Z","date":"2025-10-03","kind":"gift","planned":false,"acquired":false,"shares":604,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On January 3, 2025, the Issuer effected a 1-for-25 reverse stock split of its common stock, par value $0.0001 per share (the \"Reverse Stock Split\"). The number of securities reported herein have been adjusted to reflect the Reverse Stock Split."}],"balance_after":3814,"source":{"system":"sec-edgar","filing":"0001193125-25-310088","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1345975/000119312525310088/ownership.xml","form_type":"4"}},{"id":1000155,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Warrant (Right to Buy)","published_at":"2025-11-13T22:26:01.000Z","date":"2025-11-12","kind":"grant","planned":false,"acquired":true,"shares":96896,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Reporting Persons acquired the shares of Common Stock and Warrants in a private placement by the Issuer.  The purchase price per share of Common Stock and accompanying Warrant was $1.67 per share and accompanying Warrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The Warrant is exercisable following receipt of the Stockholder Approval (as defined herein) at an exercise price of $1.67 per share and terminates on the five year anniversary of the date of the Stockholder Approval. The holder of the Warrant may not exercise such Warrant if the holder, together with its affiliates, would beneficially own more than 4.99% (or, at the election of the holder, 9.99%) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. The Issuer is required to use its reasonable best efforts to hold a meeting of stockholders no later than January 31, 2026 for the purpose of, among other things, obtaining stockholder approval of the issuance of the shares of Common Stock issuable upon exercise of the Warrants (the \"Stockholder Approval\")."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The Warrant is exercisable following receipt of the Stockholder Approval (as defined herein) at an exercise price of $1.67 per share and terminates on the five year anniversary of the date of the Stockholder Approval. The holder of the Warrant may not exercise such Warrant if the holder, together with its affiliates, would beneficially own more than 4.99% (or, at the election of the holder, 9.99%) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. The Issuer is required to use its reasonable best efforts to hold a meeting of stockholders no later than January 31, 2026 for the purpose of, among other things, obtaining stockholder approval of the issuance of the shares of Common Stock issuable upon exercise of the Warrants (the \"Stockholder Approval\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Held by an Other RTW Fund."}],"balance_after":96896,"derivative":{"exercise_price":1.67,"underlying":"Common Stock","underlying_shares":96896},"source":{"system":"sec-edgar","filing":"0001231919-25-000468","document":"form4-11132025_101154.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000468/form4-11132025_101154.xml","form_type":"4"}},{"id":1000154,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Warrant (Right to Buy)","published_at":"2025-11-13T22:26:01.000Z","date":"2025-11-12","kind":"grant","planned":false,"acquired":true,"shares":767848,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Reporting Persons acquired the shares of Common Stock and Warrants in a private placement by the Issuer.  The purchase price per share of Common Stock and accompanying Warrant was $1.67 per share and accompanying Warrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The Warrant is exercisable following receipt of the Stockholder Approval (as defined herein) at an exercise price of $1.67 per share and terminates on the five year anniversary of the date of the Stockholder Approval. The holder of the Warrant may not exercise such Warrant if the holder, together with its affiliates, would beneficially own more than 4.99% (or, at the election of the holder, 9.99%) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. The Issuer is required to use its reasonable best efforts to hold a meeting of stockholders no later than January 31, 2026 for the purpose of, among other things, obtaining stockholder approval of the issuance of the shares of Common Stock issuable upon exercise of the Warrants (the \"Stockholder Approval\")."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The Warrant is exercisable following receipt of the Stockholder Approval (as defined herein) at an exercise price of $1.67 per share and terminates on the five year anniversary of the date of the Stockholder Approval. The holder of the Warrant may not exercise such Warrant if the holder, together with its affiliates, would beneficially own more than 4.99% (or, at the election of the holder, 9.99%) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. The Issuer is required to use its reasonable best efforts to hold a meeting of stockholders no later than January 31, 2026 for the purpose of, among other things, obtaining stockholder approval of the issuance of the shares of Common Stock issuable upon exercise of the Warrants (the \"Stockholder Approval\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held directly by RTW Innovation."}],"balance_after":767848,"derivative":{"exercise_price":1.67,"underlying":"Common Stock","underlying_shares":767848},"source":{"system":"sec-edgar","filing":"0001231919-25-000468","document":"form4-11132025_101154.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000468/form4-11132025_101154.xml","form_type":"4"}},{"id":1000153,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Warrant (Right to Buy)","published_at":"2025-11-13T22:26:01.000Z","date":"2025-11-12","kind":"grant","planned":false,"acquired":true,"shares":991544,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Reporting Persons acquired the shares of Common Stock and Warrants in a private placement by the Issuer.  The purchase price per share of Common Stock and accompanying Warrant was $1.67 per share and accompanying Warrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The Warrant is exercisable following receipt of the Stockholder Approval (as defined herein) at an exercise price of $1.67 per share and terminates on the five year anniversary of the date of the Stockholder Approval. The holder of the Warrant may not exercise such Warrant if the holder, together with its affiliates, would beneficially own more than 4.99% (or, at the election of the holder, 9.99%) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. The Issuer is required to use its reasonable best efforts to hold a meeting of stockholders no later than January 31, 2026 for the purpose of, among other things, obtaining stockholder approval of the issuance of the shares of Common Stock issuable upon exercise of the Warrants (the \"Stockholder Approval\")."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The Warrant is exercisable following receipt of the Stockholder Approval (as defined herein) at an exercise price of $1.67 per share and terminates on the five year anniversary of the date of the Stockholder Approval. The holder of the Warrant may not exercise such Warrant if the holder, together with its affiliates, would beneficially own more than 4.99% (or, at the election of the holder, 9.99%) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. The Issuer is required to use its reasonable best efforts to hold a meeting of stockholders no later than January 31, 2026 for the purpose of, among other things, obtaining stockholder approval of the issuance of the shares of Common Stock issuable upon exercise of the Warrants (the \"Stockholder Approval\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by Master Fund."}],"balance_after":991544,"derivative":{"exercise_price":1.67,"underlying":"Common Stock","underlying_shares":991544},"source":{"system":"sec-edgar","filing":"0001231919-25-000468","document":"form4-11132025_101154.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000468/form4-11132025_101154.xml","form_type":"4"}},{"id":1000152,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-11-13T22:26:01.000Z","date":"2025-11-12","kind":"grant","planned":false,"acquired":true,"shares":96896,"price":1.67,"value":161816.32,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Reporting Persons acquired the shares of Common Stock and Warrants in a private placement by the Issuer.  The purchase price per share of Common Stock and accompanying Warrant was $1.67 per share and accompanying Warrant."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Held by an Other RTW Fund."}],"balance_after":298992,"source":{"system":"sec-edgar","filing":"0001231919-25-000468","document":"form4-11132025_101154.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000468/form4-11132025_101154.xml","form_type":"4"}},{"id":1000151,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-11-13T22:26:01.000Z","date":"2025-11-12","kind":"grant","planned":false,"acquired":true,"shares":767848,"price":1.67,"value":1282306.16,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Reporting Persons acquired the shares of Common Stock and Warrants in a private placement by the Issuer.  The purchase price per share of Common Stock and accompanying Warrant was $1.67 per share and accompanying Warrant."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held directly by RTW Innovation."}],"balance_after":2427089,"source":{"system":"sec-edgar","filing":"0001231919-25-000468","document":"form4-11132025_101154.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000468/form4-11132025_101154.xml","form_type":"4"}},{"id":1000150,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-11-13T22:26:01.000Z","date":"2025-11-12","kind":"grant","planned":false,"acquired":true,"shares":991544,"price":1.67,"value":1655878.48,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Reporting Persons acquired the shares of Common Stock and Warrants in a private placement by the Issuer.  The purchase price per share of Common Stock and accompanying Warrant was $1.67 per share and accompanying Warrant."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by Master Fund."}],"balance_after":3138798,"source":{"system":"sec-edgar","filing":"0001231919-25-000468","document":"form4-11132025_101154.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000468/form4-11132025_101154.xml","form_type":"4"}},{"id":1004863,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"exercise","planned":false,"acquired":false,"price":126839,"reported_value":126839,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"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\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by an Other RTW Fund."}],"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":37863},"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004862,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"grant","planned":false,"acquired":true,"price":126839,"reported_value":126839,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"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\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by an Other RTW Fund."}],"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":37863},"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004861,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"exercise","planned":false,"acquired":false,"price":2117044,"reported_value":2117044,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"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\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by RTW Innovation."}],"balance_after":0,"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":631954},"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004860,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"grant","planned":false,"acquired":true,"price":2117044,"reported_value":2117044,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"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\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by RTW Innovation."}],"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":631954},"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004859,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"exercise","planned":false,"acquired":false,"price":2756117,"reported_value":2756117,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"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\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Held directly by Master Fund."}],"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":822722},"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004858,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"grant","planned":false,"acquired":true,"price":2756117,"reported_value":2756117,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"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\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Held directly by Master Fund."}],"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":822722},"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004857,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"exercise","planned":false,"acquired":true,"shares":37863,"price":3.35,"value":126841.05,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by an Other RTW Fund."}],"balance_after":202096,"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004856,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"exercise","planned":false,"acquired":true,"shares":631954,"price":3.35,"value":2117045.9,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by RTW Innovation."}],"balance_after":1659241,"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1004855,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-11-07T22:18:07.000Z","date":"2025-11-05","kind":"exercise","planned":false,"acquired":true,"shares":822722,"price":3.35,"value":2756118.7,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Held directly by Master Fund."}],"balance_after":2147254,"source":{"system":"sec-edgar","filing":"0001231919-25-000449","document":"form4-11072025_101100.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000123191925000449/form4-11072025_101100.xml","form_type":"4"}},{"id":1138515,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":79456,"kind":"person","name":"Gaur Shantanu","position":1,"cik":"0001985825","reported_name":"Gaur Shantanu","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-05-21T20:15:08.000Z","date":"2025-05-19","kind":"purchase","planned":false,"acquired":true,"shares":8000,"price":3.0605,"value":24484.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.06 to $3.07, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range."}],"balance_after":16000,"source":{"system":"sec-edgar","filing":"0000950170-25-075780","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1964979/000095017025075780/ownership.xml","form_type":"4"}},{"id":1169767,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-04-17T22:36:58.000Z","date":"2025-04-16","kind":"exercise","planned":false,"acquired":false,"price":5000000,"reported_value":5000000,"ownership":{"direct":false,"nature":"Please see footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"On April 15, 2025, the conversion price of $5.0 million aggregate principal amount of the convertible senior secured notes held by the Reporting Persons (the \"Notes\") was amended from $40.50 per share to $3.35 per share.  The remaining outstanding amount of the Notes remain convertible at a conversion price $40.50 per share, as well as additional conversion prices in the discretion of the Issuer (the \"Discretionary Conversions\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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 Note Purchase Agreement, as amended, 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 Company's common stock after giving effect to such conversion, unless converted pursuant to a Discretionary Conversion."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported on this Form 3, including RTW Master Fund, Ltd. (\"Master Fund\") and RTW Innovation Master Fund, Ltd. (\"RTW Innovation,\" and, together with Master Fund and other funds or accounts managed by the Adviser, the \"RTW Funds\"). 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by RTW Funds."}],"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":1492539},"source":{"system":"sec-edgar","filing":"0001062993-25-007660","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000106299325007660/form4.xml","form_type":"4"}},{"id":1169766,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Note","published_at":"2025-04-17T22:36:58.000Z","date":"2025-04-16","kind":"grant","planned":false,"acquired":true,"price":5000000,"reported_value":5000000,"ownership":{"direct":false,"nature":"Please see footnotes"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"On April 15, 2025, the conversion price of $5.0 million aggregate principal amount of the convertible senior secured notes held by the Reporting Persons (the \"Notes\") was amended from $40.50 per share to $3.35 per share.  The remaining outstanding amount of the Notes remain convertible at a conversion price $40.50 per share, as well as additional conversion prices in the discretion of the Issuer (the \"Discretionary Conversions\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"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 Note Purchase Agreement, as amended, 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 Company's common stock after giving effect to such conversion, unless converted pursuant to a Discretionary Conversion."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported on this Form 3, including RTW Master Fund, Ltd. (\"Master Fund\") and RTW Innovation Master Fund, Ltd. (\"RTW Innovation,\" and, together with Master Fund and other funds or accounts managed by the Adviser, the \"RTW Funds\"). 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by RTW Funds."}],"derivative":{"exercise_price":3.35,"expiration_date":"2031-04-16","underlying":"Common Stock","underlying_shares":1492539},"source":{"system":"sec-edgar","filing":"0001062993-25-007660","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000106299325007660/form4.xml","form_type":"4"}},{"id":1169765,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-04-17T22:36:58.000Z","date":"2025-04-16","kind":"exercise","planned":false,"acquired":true,"shares":37863,"price":3.35,"value":126841.05,"ownership":{"direct":false,"nature":"Please see footnotes"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported on this Form 3, including RTW Master Fund, Ltd. (\"Master Fund\") and RTW Innovation Master Fund, Ltd. (\"RTW Innovation,\" and, together with Master Fund and other funds or accounts managed by the Adviser, the \"RTW Funds\"). 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by RTW Funds."}],"balance_after":164233,"source":{"system":"sec-edgar","filing":"0001062993-25-007660","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493219/000106299325007660/form4.xml","form_type":"4"}},{"id":1169764,"issuer":{"id":8577,"kind":"organization","name":"ALLURION TECHNOLOGIES, INC."},"owners":[{"id":28978,"kind":"organization","name":"RTW INVESTMENTS, LP","position":1,"cik":"0001493215","reported_name":"RTW INVESTMENTS, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":27749,"kind":"person","name":"WONG RODERICK","position":2,"cik":"0001493280","reported_name":"WONG RODERICK","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73213,"kind":"person","name":"RTW MASTER FUND, LTD.","position":3,"cik":"0001493219","reported_name":"RTW MASTER FUND, LTD.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73214,"kind":"person","name":"RTW Innovation Master Fund Ltd.","position":4,"cik":"0001776733","reported_name":"RTW Innovation Master Fund Ltd.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, $0.0001 par value per share","published_at":"2025-04-17T22:36:58.000Z","date":"2025-04-16","kind":"exercise","planned":false,"acquired":true,"shares":631954,"price":3.35,"value":2117045.9,"ownership":{"direct":false,"nature":"Please see footnotes"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"RTW Investments, LP (the \"Adviser\") manages certain funds that directly hold the securities reported on this Form 3, including RTW Master Fund, Ltd. 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