# EDGAR Filing Document

**Accession Number:** 0001739410
**File Stem:** 0001674324-26-000002
**Filing Date:** 2026-2
**Character Count:** 21305
**Document Hash:** 899155cc467420b38eeab12e8ffecbc8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001674324-26-000002.hdr.sgml**: 20260227

**ACCESSION NUMBER**: 0001674324-26-000002

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

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260227

**DATE AS OF CHANGE**: 20260227

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Rallybio Corp
- **CENTRAL INDEX KEY:** 0001739410
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 851083789
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92742
- **FILM NUMBER:** 26701061

**BUSINESS ADDRESS:**
- **STREET 1:** 234 CHURCH STREET
- **STREET 2:** SUITE 1020
- **CITY:** NEW HAVEN
- **STATE:** CT
- **ZIP:** 06510
- **BUSINESS PHONE:** 203- 859-3820

**MAIL ADDRESS:**
- **STREET 1:** 234 CHURCH STREET
- **STREET 2:** SUITE 1020
- **CITY:** NEW HAVEN
- **STATE:** CT
- **ZIP:** 06510

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Rallybio Holdings, LLC
- **DATE OF NAME CHANGE:** 20180502
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** 5AM Ventures V, L.P.
- **CENTRAL INDEX KEY:** 0001674324

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

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

**BUSINESS ADDRESS:**
- **STREET 1:** 4 EMBARCADERO CENTER, SUITE 3110
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
- **BUSINESS PHONE:** (415) 993-8565

**MAIL ADDRESS:**
- **STREET 1:** 4 EMBARCADERO CENTER, SUITE 3110
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 2)**

**Rallybio Corp**

*(Name of Issuer)*

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

*(Title of Class of Securities)*

**75120L209**

*(CUSIP Number)*

**Lauren A. Daniel**<br>c/o 5AM Venture Management, LLC<br>4 Embarcadero Center, Suite 3110<br>San Francisco CA 94111<br>(415) 993-8570

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

**02/25/2026**

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

| **CUSIP No.** | **75120L209** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**5AM Ventures V, L.P.** | Name of reporting person<br>**5AM Ventures V, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**135319.00** |
| 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>**135319.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**135319.00** | Aggregate amount beneficially owned by each reporting person<br>**135319.00** | |
| 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>**2.6%** | Percent of class represented by amount in Row (11)<br>**2.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **75120L209** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**5AM Partners V, LLC** | Name of reporting person<br>**5AM Partners V, LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**135319.00** |
| 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>**135319.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**135319.00** | Aggregate amount beneficially owned by each reporting person<br>**135319.00** | |
| 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>**2.6%** | Percent of class represented by amount in Row (11)<br>**2.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **75120L209** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**5AM Opportunities I, L.P.** | Name of reporting person<br>**5AM Opportunities I, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**156469.00** |
| 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>**156469.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**156469.00** | Aggregate amount beneficially owned by each reporting person<br>**156469.00** | |
| 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>**3.0%** | Percent of class represented by amount in Row (11)<br>**3.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **75120L209** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**5AM Opportunities I (GP), LLC** | Name of reporting person<br>**5AM Opportunities I (GP), LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**156469.00** |
| 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>**156469.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**156469.00** | Aggregate amount beneficially owned by each reporting person<br>**156469.00** | |
| 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>**3.0%** | Percent of class represented by amount in Row (11)<br>**3.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **75120L209** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Andrew J. Schwab** | Name of reporting person<br>**Andrew J. Schwab** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**291788.00** |
| 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>**291788.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**291788.00** | Aggregate amount beneficially owned by each reporting person<br>**291788.00** | |
| 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>**5.5%** | Percent of class represented by amount in Row (11)<br>**5.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **75120L209** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Kush Parmar** | Name of reporting person<br>**Kush Parmar** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**291788.00** |
| 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>**291788.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**291788.00** | Aggregate amount beneficially owned by each reporting person<br>**291788.00** | |
| 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>**5.5%** | Percent of class represented by amount in Row (11)<br>**5.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **75120L209** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Scott M. Rocklage** | Name of reporting person<br>**Scott M. Rocklage** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**135319.00** |
| 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>**135319.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**135319.00** | Aggregate amount beneficially owned by each reporting person<br>**135319.00** | |
| 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>**2.6%** | Percent of class represented by amount in Row (11)<br>**2.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

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

**(b) Name of Issuer:**
Rallybio Corp

**(c) Address of Issuer's Principal Executive Offices:**
234 CHURCH STREET, SUITE 1020, NEW HAVEN, CT, 06510

This Amendment No. 2 (this "Amendment No. 2" or this "Schedule 13D/A") amends and supplements the statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") on August 12, 2021 and amended on June 7,  2022 (as amended, the "Statement") by the Reporting Persons. Unless otherwise defined herein, capitalized terms used in this Amendment No. 2 shall have the meanings ascribed to them in the Statement. Unless amended or supplemented below, the information in the Statement remains unchanged.

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

**(a)**
Rows 11 and 13 of each Reporting Person's cover page to this Schedule 13D/A set forth the aggregate number of shares of common stock and percentages of the shares of common stock beneficially owned by such Reporting Person and are incorporated by reference. The percentage set forth in each row 13 is based upon 5,280,471 shares of common stock outstanding as of December 30, 2025 as reported in the Issuer's definitive proxy statement filed with the SEC on January 2, 2026 and giving effect to an 8-for-1 reverse split of the Issuer's common stock, which was effected on February 2, 2026.

The Reporting Persons' beneficial ownership of the Issuer's common stock consists of (i) 135,319 shares of common stock directly held by 5AM V; and (ii) 156,469 shares of common stock directly held by 5AM Opportunities.

5AM Partners V is the sole general partner of 5AM V and shares voting and dispositive power over the securities held by 5AM Partners V. 5AM Opportunities GP is the sole general partner of 5AM Opportunities and shares voting and dispositive power over the securities held by 5AM Opportunities. Schwab and Drs. Parmar and Rocklage are the managing members of 5AM Partners V and share voting and dispositive power over the securities held by 5AM V. Schwab and Dr. Parmar are the managing members of 5AM Opportunities GP and share voting and dispositive power over the securities held by 5AM Opportunities.

**(b)**
Rows 7 through 10 of each Reporting Person's cover page to this Schedule 13D/A set forth the number of shares of common stock as to which such 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 and are incorporated by reference.

**(c)**
Except as set forth below, none of the Reporting Persons has effected any transactions with respect to the securities of the Issuer during the past sixty days.

On February 25, 2025, 5AM V sold an aggregate of 87,052 shares in open market transactions at prices ranging from $6.00 to $6.15 (weighted average sales price of $6.07 per share).
On February 26, 2025, 5AM V sold an aggregate of 75,000 shares in open market transactions at prices ranging from $6.00 to $6.14 (weighted average sales price of $6.06 per share).

### 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:** 5AM Ventures V, L.P.

**Signature:** /s/ Scott M. Rocklage

**Name/Title:** By 5AM Partners V, LLC, its General Partner, By Scott M. Rocklage, Managing Member

**Date:** 02/27/2026

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:** 5AM Partners V, LLC

**Signature:** /s/ Scott M. Rocklage

**Name/Title:** By Scott M. Rocklage, Managing Member

**Date:** 02/27/2026

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:** 5AM Opportunities I, L.P.

**Signature:** /s/ Kush Parmar

**Name/Title:** By 5AM Opportunities I (GP), LLC, its General Partner, By Kush Parmar, Managing Member

**Date:** 02/27/2026

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:** 5AM Opportunities I (GP), LLC

**Signature:** /s/ Kush Parmar

**Name/Title:** By Kush Parmar, Managing Member

**Date:** 02/27/2026

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:** Andrew J. Schwab

**Signature:** /s/ Andrew J. Schwab

**Name/Title:** Andrew J. Schwab

**Date:** 02/27/2026

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:** Kush Parmar

**Signature:** /s/ Kush Parmar

**Name/Title:** Kush Parmar

**Date:** 02/27/2026

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:** Scott M. Rocklage

**Signature:** /s/ Scott M. Rocklage

**Name/Title:** Scott M. Rocklage

**Date:** 02/27/2026