Rallybio: ADAR1 reports 926,352 shares (17.5%)

Rallybio Corporation: ADAR1 Capital Management, LLC and Daniel Schneeberger report beneficial ownership of 926,352 shares of Common Stock, representing 17.5% of the class.

Rhea-AI Filing Summary

Rallybio Corporation: ADAR1 Capital Management, LLC and Daniel Schneeberger report beneficial ownership of 926,352 shares of Common Stock, representing 17.5% of the class. The filing states this percentage is based on 5,298,137 shares outstanding as of May 8, 2026. The shares are owned directly by private funds and separately managed accounts advised by ADAR1; Mr. Schneeberger is the sole manager and files as a control person.

Insights

Governance Specialist

Large passive stake disclosed by an investment adviser and its manager.

The filing lists 926,352 shares and a 17.5% ownership stake based on an outstanding share count of May 8, 2026. The position is held by private funds and separately managed accounts managed by ADAR1 Capital Management, LLC, and Mr. Schneeberger is named as the control person.

Voting and dispositive power are reported as shared for these shares. Subsequent disclosures could show changes; timing of any sales or additional reporting is not included in this excerpt.

Investor-Relations Analyst

Disclosure clarifies ownership but does not signal an immediate corporate action.

The Schedule 13G treats the position as beneficial ownership by ADAR1-managed accounts with Mr. Schneeberger filing as a control person; the form format implies passive intent unless otherwise stated.

Cash‑flow treatment and any planned transactions are not disclosed in the excerpt; future filings would show if the stake is active or passive.

Key Figures

Reported shares owned: 926,352 shares Percent of class: 17.5% Shares outstanding used: 5,298,137 shares

3 metrics

Reported shares owned 926,352 shares owned by private funds and managed accounts of ADAR1

Percent of class 17.5% based on 5,298,137 shares outstanding as of <date>May 8, 2026</date>

Shares outstanding used 5,298,137 shares as reported in the Company's Form 10-Q for quarter ended March 31, 2026

Key Terms

beneficially owned, shared dispositive power, control person, Schedule 13G

4 terms

beneficially owned regulatory

"The amounts reported in boxes 6, 8, and 9 represent 926,352 shares of common stock"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power regulatory

"Shared Dispositive Power 926,352.00"

control person regulatory

"Mr. Schneeberger is filing this Schedule 13G as a control person"

A control person is an individual or entity that can significantly influence a company’s decisions and direction through ownership, voting power, or contractual rights—think of them as the captain who can steer the ship. Investors care because a control person’s choices affect corporate strategy, board appointments, and transactions that can raise or lower a stock’s value, and they often carry additional legal responsibilities and disclosure requirements to protect other shareholders.

Schedule 13G regulatory

"This Schedule is being filed on behalf of each of the following persons"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

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

What stake does ADAR1 report in Rallybio (RLYB)?

ADAR1 reports beneficial ownership of 926,352 shares, representing 17.5% of the class. The percentage uses an outstanding share base of 5,298,137 shares as of May 8, 2026, per the filing.

Who is Daniel Schneeberger in the RLYB Schedule 13G?

Mr. Schneeberger is the sole manager of ADAR1 Capital Management, LLC and files as a control person. The filing states he may be deemed to indirectly beneficially own the reported shares.

Are the shares held directly or indirectly for RLYB?

The filing states the 926,352 shares are owned directly by private funds and separately managed accounts managed by ADAR1. Mr. Schneeberger’s beneficial ownership is described as indirect via his management role.

Does the Schedule 13G indicate ADAR1 will sell Rallybio shares?

The filing does not disclose any planned sales or transactions. It lists current beneficial ownership by ADAR1-managed accounts without describing disposition plans or cash‑flow treatment.

What outstanding share count does the filing use for RLYB ownership percentage?

The percentage is based on 5,298,137 shares outstanding as of May 8, 2026, referenced from Rallybio’s Form 10-Q for the quarter ended March 31, 2026, cited in the Schedule 13G.

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

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Accepted by SEC EDGAR 06/05/2026 - 04:34 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Rallybio Corporation

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

75120L209

(CUSIP Number)

05/31/2026

(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

ADAR1 Capital Management, 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

TEXAS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 926,352.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 926,352.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

926,352.00

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)

17.5 %

12

Type of Reporting Person (See Instructions)

IA, OO

Comment for Type of Reporting Person: The amounts reported in boxes 6, 8, and 9 represent 926,352 shares of common stock, par value $0.0001 per share ("Common Stock"), of Rallybio Corporation (the "Company") owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC. Such securities may be deemed to be indirectly beneficially owned by ADAR1 Capital Management, LLC. The percentage in box 11 is based on 5,298,137 shares of Common Stock outstanding as of May 8, 2026, as reported in the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed with the Securities and Exchange Commission on May 13, 2026.

SCHEDULE 13G

CUSIP Number(s): 75120L209

1

Names of Reporting Persons

Daniel Schneeberger

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

SWITZERLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 926,352.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 926,352.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

926,352.00

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)

17.5 %

12

Type of Reporting Person (See Instructions)

HC, IN

Comment for Type of Reporting Person: The amounts reported in boxes 6, 8, and 9 represent 926,352 shares of common stock, par value $0.0001 per share ("Common Stock"), of Rallybio Corporation (the "Company") owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC. Such securities may be deemed to be indirectly beneficially owned by Daniel Schneeberger, the sole manager of ADAR1 Capital Management, LLC. The percentage in box 11 is based on 5,298,137 shares of Common Stock outstanding as of May 8, 2026, as reported in the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed with the Securities and Exchange Commission on May 13, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Rallybio Corporation
(b)	Address of issuer's principal executive offices: 234 Church Street, New Haven, CT 06510
Item 2.
(a)	Name of person filing: This Schedule is being filed on behalf of each of the following persons (each, a "Reporting Person" and collectively, the "Reporting Persons"): (i) ADAR1 Capital Management, LLC ("ADAR1 Capital Management"); and (ii) Daniel Schneeberger ("Mr. Schneeberger").
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the Reporting Persons is 3503 Wild Cherry Drive, Building 9, Austin, Texas 78738.
(c)	Citizenship: (i) ADAR1 Capital Management is a Texas limited liability company; and (ii) Mr. Schneeberger is a citizen of Switzerland.
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP Number(s): 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: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
(b)	Percent of class: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
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.
	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.
	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. Mr. Schneeberger is filing this Schedule 13G as a control person in respect of shares beneficially owned by ADAR1 Capital Management, an investment adviser as described in SS 240.13d-1(b)(1)(ii)(E).
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.

ADAR1 Capital Management, LLC

Signature:	/s/ Daniel Schneeberger
Name/Title:	Daniel Schneeberger, Manager
Date:	06/05/2026

Daniel Schneeberger

Signature:	/s/ Daniel Schneeberger
Name/Title:	Daniel Schneeberger, in his individual capacity
Date:	06/05/2026

Exhibit Information

Exhibit A: Joint Filing Agreement