Cormorant Asset Management (RLYB) now reports 0% beneficial ownership of Rallybio

Rhea-AI Filing Summary

Cormorant Asset Management, LP and Bihua Chen report that they no longer beneficially own any shares of Rallybio Corp common stock. They state beneficial ownership of 0 shares, representing 0.0% of Rallybio’s common stock, with no sole or shared voting or dispositive power.

The ownership percentages are based on 5,298,137 shares of Rallybio common stock outstanding as of May 8, 2026, as referenced from Rallybio’s Quarterly Report for the period ended March 31, 2026. The filers also indicate that the statement should not be construed as an admission of beneficial ownership for purposes of Section 13.

Key Figures

Beneficially owned shares: 0 Percent of class owned: 0.0% Shares outstanding: 5,298,137 shares +1 more

4 metrics

Beneficially owned shares 0 Shares of Rallybio common stock beneficially owned by the reporting persons

Percent of class owned 0.0% Percent of Rallybio common stock class beneficially owned by the reporting persons

Shares outstanding 5,298,137 shares Rallybio common stock outstanding as of May 8, 2026, from the company’s Quarterly Report

Par value per share $0.0001 per share Par value of Rallybio Corp common stock

Key Terms

beneficial owner, Sole Voting Power, dispositive power, percent of class

4 terms

beneficial owner regulatory

"for the purposes of Section 13 of the Act, the beneficial owner of the shares"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

Sole Voting Power regulatory

"Sole Voting Power 0.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power regulatory

"Sole Dispositive Power 0.00 8 | Shared Dispositive Power 0.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

percent of class financial

"Percent of class: 0.0%"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

FAQ

What change in ownership does this Schedule 13G/A report for RLYB?

Cormorant Asset Management, LP and Bihua Chen report 0 shares of Rallybio Corp common stock, indicating 0.0% beneficial ownership and no sole or shared voting or dispositive power over Rallybio shares.

Who are the reporting persons in this Rallybio (RLYB) Schedule 13G/A amendment?

The reporting persons are Cormorant Asset Management, LP, a Delaware limited partnership, and Bihua Chen. They report with respect to shares previously directly held by certain Cormorant funds advised by Cormorant Asset Management.

What percentage of Rallybio (RLYB) does Cormorant Asset Management now own?

Cormorant Asset Management and Bihua Chen report beneficial ownership of 0.0% of Rallybio Corp’s common stock, with no shares over which they have sole or shared voting or dispositive power.

On what share count is the 0.0% Rallybio (RLYB) ownership calculation based?

The 0.0% figure is calculated using 5,298,137 shares of Rallybio common stock outstanding as of May 8, 2026, as referenced from Rallybio’s Quarterly Report for the period ended March 31, 2026.

What is the class of securities covered in this Rallybio (RLYB) Schedule 13G/A?

The filing covers Rallybio Corp’s Common Stock, par value $0.0001 per share, with CUSIP number 75120L209, for which the reporting persons now state zero beneficial ownership.

Do the filers admit beneficial ownership of Rallybio (RLYB) shares in this amendment?

The reporting persons state that the filing should not be construed as an admission that any of them is, for purposes of Section 13 of the Exchange Act, the beneficial owner of the shares reported.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/14/2026 - 02:06 PM Accepted by SEC EDGAR 08/14/2026 - 02:05 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Rallybio Corp

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

75120L209

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 75120L209

1

Names of Reporting Persons

Cormorant Asset Management, LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): 75120L209

1

Names of Reporting Persons

Bihua Chen

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Rallybio Corp
(b)	Address of issuer's principal executive offices: PO Box No. 325, East Berlin, CT 06023
Item 2.
(a)	Name of person filing: Cormorant Asset Management, LP Bihua Chen This statement is filed by (i) Cormorant Asset Management, LP, a Delaware limited partnership, and the investment adviser to certain funds (the "Cormorant Funds"), with respect to the shares directly held by the Cormorant Funds and (ii) Bihua Chen with respect to the shares directly held by the Cormorant Funds. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Act, the beneficial owner of the shares reported herein.
(b)	Address or principal business office or, if none, residence: 200 Clarendon Street, 50th Floor Boston, MA 02116
(c)	Citizenship: Cormorant Asset Management, LP - Delaware Bihua Chen - United States
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP No.: 75120L209
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 0
(b)	Percent of class: 0.0%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0 The percentages reported herein with respect to the Reporting Persons' holdings are calculated based upon a statement in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, as filed with the Securities and Exchange Commission on May 13, 2026, that there were 5,298,137 shares of Common Stock of the Issuer outstanding as of May 8, 2026.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Cormorant Asset Management, LP

Signature:	/s/ Bihua Chen
Name/Title:	Bihua Chen, Managing Member
Date:	08/14/2026

Bihua Chen

Signature:	/s/ Bihua Chen
Name/Title:	Bihua Chen
Date:	08/14/2026

Exhibit Information

Joint Filing Statement, incorporated by reference to the Joint Filing Statement included with the Schedule 13G filed by the Reporting Persons on May 15, 2026.