Comparable stake leader
RTW INVESTMENTS, LP
SEC ownership of ALLURION TECHNOLOGIES, INC.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001964979.
Disclosed value leader
RTW INVESTMENTS, LP
Comparable rows
6/16
Latest evidence
31 Mar 2026
- Public ticker
- ALUR, ALURW on OTC
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
RTW INVESTMENTS, LP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
6 of 16
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
RTW INVESTMENTS, LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001964979
- Issuer location
- Natick, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ALLURION TECHNOLOGIES, INC. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
RTW INVESTMENTS, LP
Disclosed value leader
RTW INVESTMENTS, LP
Comparable rows
6/16
Latest evidence
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 39%
10 rows are not safely comparable across share classes.
13D/G row: RTW INVESTMENTS, LP
Showing 1-8 of 16 holder rows.
Quick read
RTW INVESTMENTS, LP leads the comparable SEC ownership view at 39%.
6 of 16 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens RTW INVESTMENTS, LP's linked filing trail.
Comparable ownership
Top 5
RTW INVESTMENTS, LP
39%
Leavitt Equity Partners III, L.P.
7.8%
Brendan M. Gibbons
0.07%
Ojas Buch
0.07%
Michael R. Davin
0.01%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 16 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| RTW INVESTMENTS, LP |
13D/G
3/4/5
Director, 10%+ Owner
|
39%
|
$8,542,574
5,891,430 shares
|
$0 | 26 Feb 2026 |
| Leavitt Equity Partners III, L.P. |
13D/G
|
7.8%
|
$198,988
462,762 shares
|
$0 | 01 Jul 2024 |
| Brendan M. Gibbons |
3/4/5
Chief Legal Officer
|
0.07%
|
$16,132
10,408 shares
|
— | 31 Dec 2025 |
| Ojas Buch |
3/4/5
Chief Operating Officer
|
0.07%
|
$15,845
10,223 shares
|
— | 31 Dec 2025 |
| Michael R. Davin |
3/4/5
Director
|
0.01%
|
$1,809
1,206 shares
|
-$4,918 | 03 Oct 2025 |
| HARBOUR INVESTMENTS, INC. |
13F
Company
|
0%
|
$1
2 shares
|
— | 31 Mar 2026 |
| Krishna K. Gupta |
3/4/5
Director, 10%+ Owner
|
—
class O/S missing
|
$3,608,111
1,919,208 shares
|
— | 23 Oct 2023 |
| S. Omar Ishrak |
3/4/5
Director
|
—
class O/S missing
|
$6,218,939
3,307,946 shares
|
— | 23 Oct 2023 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$4,918.
Buys
$0
Insiders: 0
Sells
$4,918
Insiders: 1
Net
-$4,918
Shares: -3,212
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 3,212
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 3,212 | $0 | $4,918 | -$4,918 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-15 of 15 reporting-owner rows connected to ALLURION TECHNOLOGIES, INC.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
15
Largest Forms 3/4/5 holder
S. Omar Ishrak
Net 12M change
-$4,918
Latest report
31 Dec 2025
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| S. Omar Ishrak | Director | $6,218,939 | Mixed | 23 Oct 2023 | ||
| Krishna K. Gupta | Director, 10%+ Owner | $3,608,111 | Mixed | 23 Oct 2023 | ||
| Ram Chuttani | Chief Medical Officer | $3,126,244 | Mixed | 02 May 2024 | ||
| Keith B. Johns II | Director | $1,092,388 | Mixed | 08 Nov 2024 | ||
| RTW INVESTMENTS, LP | Director, 10%+ Owner | $499,316 | Mixed | 12 Nov 2025 | ||
| Benoit Chardon | Chief Commercial Officer | $374,464 | Mixed | 12 Dec 2023 | ||
| Milena Alberti-Perez | Director | $141,000 | Mixed | 11 Mar 2024 | ||
| Shantanu Gaur | Chief Executive Officer, Director | $101,109 | Mixed | 19 May 2025 | ||
| Nicholas Sheridan Lewin | Director | $85,042 | Mixed | 23 Oct 2023 | ||
| Larson Douglas Hudson | Director | $85,042 | Mixed | 23 Oct 2023 | ||
| Brendan M. Gibbons | Chief Legal Officer | $16,132 | Mixed | 31 Dec 2025 | ||
| Ojas Buch | Chief Operating Officer | $15,845 | Mixed | 31 Dec 2025 | ||
| Michael R. Davin | Director | $1,809 | -$4,918 | -73% | Mixed | 03 Oct 2025 |
| Christopher J. Geberth | Chief Financial Officer | Mixed | 01 Aug 2023 | |||
| Robert Jason Richey | Director | Mixed | 30 Dec 2024 |
Recent insider transactions for ALLURION TECHNOLOGIES, INC.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Michael R. Davin | ALUR | Common Stock | Sale | -100% | $2,541 | $1.58 | -1,606 | 0 | 04 Dec 2025 | See footnote |
| Michael R. Davin | ALUR | Common Stock | Sale | -50% | $2,377 | $1.48 | -1,606 | 1,606 | 03 Dec 2025 | See footnote |
| Michael R. Davin | ALUR | Common Stock | Gift | 431.8% | 2,608 | 3,212 | 26 Nov 2025 | See footnote | ||
| Michael R. Davin | ALUR | Common Stock | Gift | -68.4% | -2,608 | 1,206 | 26 Nov 2025 | Direct | ||
| Rtw Investments, Lp | ALUR | Common Stock, $0.0001 par value per share | Award | 144.7% | 1,856,288 | 3,138,798 | 12 Nov 2025 | See footnotes | ||
| Rtw Investments, Lp | ALUR | Warrant (Right to Buy) | Award | 1,856,288 | 991,544 | 12 Nov 2025 | See footnotes | |||
| Brendan M. Gibbons | ALUR | Common Stock | Tax liability | -15.2% | -1,862 | 10,408 | 08 Nov 2025 | Direct | ||
| Ojas Buch | ALUR | Common Stock | Tax liability | -16.7% | -2,047 | 10,223 | 08 Nov 2025 | Direct | ||
| Rtw Investments, Lp | ALUR | Common Stock, $0.0001 par value per share | Conversion of derivative security | 228% | 1,492,539 | 2,147,254 | 05 Nov 2025 | See footnotes | ||
| Rtw Investments, Lp | ALUR | Convertible Note | Conversion of derivative security | 0 | $0 | 05 Nov 2025 | See footnotes | |||
| Rtw Investments, Lp | ALUR | Convertible Note | Award | 0 | $2,117,044 | 05 Nov 2025 | See footnotes | |||
| Rtw Investments, Lp | ALUR | Convertible Note | Conversion of derivative security | 0 | $0 | 05 Nov 2025 | See Footnotes | |||
| Rtw Investments, Lp | ALUR | Convertible Note | Award | 0 | $2,756,117 | 05 Nov 2025 | See Footnotes | |||
| Michael R. Davin | ALUR | Common Stock | Gift | 604 | 604 | 03 Oct 2025 | See footnote | |||
| Michael R. Davin | ALUR | Common Stock | Gift | -13.7% | -604 | 3,814 | 03 Oct 2025 | Direct |
* marks a reported price that did not pass the local price check.