# EDGAR Filing Document

**Accession Number:** 0001493215
**File Stem:** 0001493215-26-000066
**Filing Date:** 2026-3
**Character Count:** 12970
**Document Hash:** 087f97ecc520081cb6cdd900b643aaa2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001493215-26-000066.hdr.sgml**: 20260302

**ACCESSION NUMBER**: 0001493215-26-000066

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260302

**DATE AS OF CHANGE**: 20260302

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ALLURION TECHNOLOGIES, INC.
- **CENTRAL INDEX KEY:** 0001964979
- **STANDARD INDUSTRIAL CLASSIFICATION:** SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-94138
- **FILM NUMBER:** 26707957

**BUSINESS ADDRESS:**
- **STREET 1:** 11 HURON DR STE 200
- **CITY:** NATICK
- **STATE:** MA
- **ZIP:** 01760
- **BUSINESS PHONE:** 508-647-4000

**MAIL ADDRESS:**
- **STREET 1:** 11 HURON DR STE 200
- **CITY:** NATICK
- **STATE:** MA
- **ZIP:** 01760

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ALLURION TECHNOLOGIES HOLDINGS, INC.
- **DATE OF NAME CHANGE:** 20230207
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** RTW INVESTMENTS, LP
- **CENTRAL INDEX KEY:** 0001493215

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** 40 10TH AVENUE
- **STREET 2:** 7TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10014
- **BUSINESS PHONE:** 646-597-6980

**MAIL ADDRESS:**
- **STREET 1:** 40 10TH AVENUE
- **STREET 2:** 7TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10014

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** RTW INVESTMENTS, LLC
- **DATE OF NAME CHANGE:** 20100602

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 11)**

**ALLURION TECHNOLOGIES, INC.**

*(Name of Issuer)*

**Common Stock, par value $0.0001 per share**

*(Title of Class of Securities)*

**02008G201**

*(CUSIP Number)*

**Roderick Wong, M.D.**<br>RTW Investments, LP<br>40 10th Avenue, Floor 7<br>New York NY 10014<br>(646) 597-6980

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**02/26/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **02008G201** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**RTW Investments, LP** | Name of reporting person<br>**RTW Investments, LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**5891430.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**5891430.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**5891430.00** | Aggregate amount beneficially owned by each reporting person<br>**5891430.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**39.4%** | Percent of class represented by amount in Row (11)<br>**39.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

| **CUSIP No.** | **02008G201** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**RTW Master Fund, Ltd.** | Name of reporting person<br>**RTW Master Fund, Ltd.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**3138798.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**3138798.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3138798.00** | Aggregate amount beneficially owned by each reporting person<br>**3138798.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**21.0%** | Percent of class represented by amount in Row (11)<br>**21.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **02008G201** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**RTW Innovation Master Fund, Ltd.** | Name of reporting person<br>**RTW Innovation Master Fund, Ltd.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**2427089.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**2427089.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**2427089.00** | Aggregate amount beneficially owned by each reporting person<br>**2427089.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**16.2%** | Percent of class represented by amount in Row (11)<br>**16.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **02008G201** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Roderick Wong** | Name of reporting person<br>**Roderick Wong** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**5891430.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**5891430.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**5891430.00** | Aggregate amount beneficially owned by each reporting person<br>**5891430.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**39.4%** | Percent of class represented by amount in Row (11)<br>**39.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.0001 per share

**(b) Name of Issuer:**
ALLURION TECHNOLOGIES, INC.

**(c) Address of Issuer's Principal Executive Offices:**
11 Huron Drive, Natick, MA, 01760

**Item 5. Interest in Securities of the Issuer**

**(a)**
Items 5(a)-(c) of the Schedule 13D are hereby amended and supplemented as follows:

The aggregate percentage of Shares reported to be beneficially owned by the Reporting Persons is based upon the sum of (i) 12,279,181 Shares outstanding as of January 5, 2026 as reported in the Issuer's prospectus dated January 16, 2026 filed with the Securities and Exchange Commission (the "SEC") on January 20, 2026 and (ii) 2,659,565 Shares issued pursuant to an Inducement Offer to Exercise Common Stock Purchase Warrants dated February 24, 2026, which closed on February 26, 2026.

**(b)**
See rows (7) through (10) of the cover pages to this Schedule 13D/A for the number of shares of Common Stock as to which each Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition.

**(c)**
No transactions with respect to the securities of the Issuer have been effected during the past sixty days by any Reporting Person. The percentage ownership reported in this Schedule 13D/A reflect an increase in the number of outstanding shares of the Issuer.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** RTW Investments, LP

**Signature:** /s/ Roderick Wong, M.D.

**Name/Title:** Roderick Wong, M.D., Managing Partner

**Date:** 03/02/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** RTW Master Fund, Ltd.

**Signature:** /s/ Darshan Patel

**Name/Title:** Darshan Patel, Director

**Date:** 03/02/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** RTW Innovation Master Fund, Ltd.

**Signature:** /s/ Darshan Patel

**Name/Title:** Darshan Patel, Director

**Date:** 03/02/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Roderick Wong

**Signature:** /s/ Roderick Wong, M.D.

**Name/Title:** Roderick Wong, M.D.

**Date:** 03/02/2026