Allurion Technologies, Inc.
ALUR- Exchange
- OTC
- Industry
- Surgical & Medical Instruments & Apparatus
- SEC CIK
- 0001964979
No open-market purchases or sales by Allurion Technologies, Inc. insiders were filed in the last 90 days; no institution reported holding it in 13F filings for Q2 2026; no superinvestor holds it.
Other share classesALURW
Holders of 5% or more of ALUR
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Allurion Technologies, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| RTW Investments, LP | 13D/A | 39.40%5.89M shares | −8.70 ppfrom 48.10% | Jan 10, 20257 filings | Mar 2, 2026 | SEC |
| RTW Investments, LP | 13D/A | 17.60%1.05M shares | – | Feb 24, 20251 filing | Feb 24, 2025 | SEC |
| Leavitt Equity Partners III, L.P. | 13G | 7.80%462.8K shares | New | Feb 26, 20251 filing | Feb 26, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
11 Schedule 13D and 13G filings on Allurion Technologies, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 2, 20264:20 PM ET | RTW Investments, LPand 3 others | 13D/A | 39.40%5.89M shares | −8.70 ppfrom 48.10% | Feb 26, 2026 | SEC |
| Nov 13, 20255:20 PM ET | RTW Investments, LPand 3 others | 13D/A | 48.10%5.89M shares | +4.50 ppfrom 43.60% | Nov 11, 2025 | SEC |
| Nov 7, 20255:21 PM ET | RTW Investments, LPand 3 others | 13D/A | 43.60%4.04M shares | +9.50 ppfrom 34.10% | Nov 5, 2025 | SEC |
| May 15, 20253:33 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 4.99%391.6K shares | 0.00 ppfrom 4.99%Below 5% | Mar 31, 2025 | SEC |
| Apr 17, 20256:34 PM ET | RTW Investments, LPand 3 others | 13D/A | 34.10%2.54M shares | +12.20 ppfrom 21.90% | Apr 15, 2025 | SEC |
| Feb 26, 20254:10 PM ET | Leavitt Equity Partners III, L.P.and 4 others | 13G | 7.80%462.8K shares | New | Jul 1, 2024 | SEC |
| Feb 24, 20254:15 PM ET | RTW Investments, LPand 3 others | 13D/A | 17.60%1.05M shares | – | Feb 20, 2025 | SEC |
| Feb 7, 20254:00 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 4.99%251.7K shares | –Below 5% | Jan 31, 2025 | SEC |
| Jan 29, 20254:10 PM ET | RTW Investments, LPand 3 others | 13D/A | 21.90%1.05M shares | −7.70 ppfrom 29.60% | Jan 28, 2025 | SEC |
| Jan 16, 20258:22 PM ET | RTW Investments, LPand 1 other | 13D/A | 29.60%1.05M shares | +19.61 ppfrom 9.99% | Jan 14, 2025 | SEC |
| Jan 10, 20257:39 PM ET | RTW Investments, LPand 1 other | 13D/A | 9.99%277.8K shares | – | Jan 7, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Allurion Technologies, Inc. shares.
No Form 144 notices for Allurion Technologies, Inc. are on file.