FMR LLC Reports 7.1% Stake in Rallybio

RALLYBIO CORP ownership disclosure: FMR LLC reports beneficial ownership of 372,827 shares of common stock, equal to 7.1% of the class as of 03/02/2026.

Rhea-AI Filing Summary

RALLYBIO CORP ownership disclosure: FMR LLC reports beneficial ownership of 372,827 shares of common stock, equal to 7.1% of the class as of 03/02/2026. The filing states FMR LLC has sole voting and dispositive power over these 372,827 shares.

The filing also attributes dispositive power over the same 372,827 shares to Abigail P. Johnson. Signatures are dated 03/05/2026 and an Exhibit 99 is referenced for a 13d-1(k)(1) agreement.

Insights

Institutional Ownership Analyst

FMR LLC holds a >5% stake in Rallybio, a notable institutional position.

FMR LLC reports 372,827 shares representing 7.1% of common stock as of 03/02/2026. The disclosure lists sole voting and dispositive power for FMR LLC, indicating direct control over disposition decisions.

Investor implications depend on whether this position is strategic or passive; subsequent filings (e.g., amendments or Schedule 13D) would clarify intent. The referenced Exhibit 99 may contain the 13d-1(k)(1) agreement governing any shared/attributed holdings.

Securities Compliance Counsel

Filing appears procedural and consistent with Schedule 13G reporting requirements.

The Schedule 13G lists the filer, address, CUSIP, and ownership details including sole voting and dispositive powers totaling 372,827 shares (7.1%); signatures cite powers of attorney dated in 2023 and certification dates 03/05/2026.

Compliance points to watch: the referenced Exhibit 99 and any future amendments that would indicate active intent; timing and any change in percent ownership would be disclosed in subsequent SEC filings.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does FMR LLC report in RLYB (Rallybio) in this Schedule 13G?

FMR LLC reports beneficial ownership of 372,827 shares, representing 7.1% of Rallybio common stock as of 03/02/2026. The filing states FMR LLC has sole voting and dispositive power over those shares.

Does Abigail P. Johnson have voting or dispositive power over RLYB shares?

The filing attributes dispositive power for 372,827 shares to Abigail P. Johnson while listing zero shared voting power. Signatures dated 03/05/2026 reference powers of attorney for authority.

What form and document details are included in the Rallybio filing?

This is a Schedule 13G for Rallybio common stock (CUSIP 75120L209). It names the filer (FMR LLC), provides an address, ownership amount, and references Exhibit 99 for a 13d-1(k)(1) agreement.

Does the Schedule 13G indicate whether FMR LLC plans to change its position in RLYB?

The Schedule 13G reports current ownership and control attributes but does not state any plans to buy or sell. Future intent or changes would appear in amendments or a Schedule 13D if disclosed.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 03/06/2026 - 10:09 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

RALLYBIO CORP

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

03/02/2026

(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)

SCHEDULE 13G

CUSIP Number(s):

1

Names of Reporting Persons

FMR LLC

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 372,827.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 372,827.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

372,827.00

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)

7.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s):

1

Names of Reporting Persons

Abigail P. Johnson

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 372,827.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

372,827.00

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)

7.1 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: RALLYBIO CORP
(b)	Address of issuer's principal executive offices: 234 Church Street,Suite 1020,New Haven,CT,US,06510
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(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: 372827.00
(b)	Percent of class: 7.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 372827.00
	(iv) Shared power to dispose or to direct the disposition of: 0.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the COMMON STOCK of RALLYBIO CORP. No one other person's interest in the COMMON STOCK of RALLYBIO CORP is more than five percent of the total outstanding COMMON STOCK.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See attached Exhibit 99.
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 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.

FMR LLC

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 3, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	03/05/2026

Abigail P. Johnson

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 26, 2023, by and on behalf of Abigail P. Johnson**
Date:	03/05/2026

Comments accompanying signature: * This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 10, 2023, accession number: 0000315066-23-000003. ** This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 31, 2023, accession number: 0000315066-23-000038.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.