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  4. [Form 3] Rallybio Corp Initial Statement of Beneficial Ownership

Rallybio (RLYB) gets new 10% insider filing from ADAR1 group

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Rallybio Corp reported that investment manager ADAR1 Capital Management, LLC and Daniel Schneeberger are each 10% owners of the company’s common stock. The Form 3 shows 623,879 shares of common stock held indirectly through private investment funds and separately managed accounts managed by ADAR1.

ADAR1 and Schneeberger may be deemed to indirectly beneficially own these shares but each disclaims beneficial ownership except to the extent of any pecuniary interest. The filing records an existing indirect holding rather than a new purchase or sale.

Positive

  • None.

Negative

  • None.
Insider ADAR1 Capital Management, LLC, Schneeberger Daniel
Role null | null
Type Security Shares Price Value
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 623,879 shares (Indirect, See Footnote)
Footnotes (1)
  1. The reported securities are owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC, and may be deemed to be indirectly beneficially owned by (i) ADAR1 Capital Management, LLC and (ii) Daniel Schneeberger, the sole manager of ADAR1 Capital Management, LLC. For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.
Indirect common shares held 623,879 shares Common Stock position reported on Form 3
indirectly beneficially owned financial
"may be deemed to be indirectly beneficially owned by (i) ADAR1 Capital Management, LLC"
pecuniary interest financial
"disclaims beneficial ownership of any such securities, except to the extent of his/its pecuniary interest therein"
Section 16 of the Securities Exchange Act of 1934 regulatory
"For purposes of Section 16 of the Securities Exchange Act of 1934, as amended"
A provision of federal securities law that requires company insiders—directors, officers and large shareholders—to publicly report their stock holdings and trades and to surrender any “short-swing” profits from purchases and sales within a six-month window. It acts like a rule that forces leaders to announce their trades and prevents quick buy-sell windfalls, giving investors transparency into insider activity and reducing opportunities for unfair gain.
Understanding Insider Trading Forms →
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
ADAR1 Capital Management, LLC
(Last)(First)(Middle)
3503 WILD CHERRY DRIVE, BUILDING 9
(Street)
AUSTIN TEXAS 78738
(City)(State)(Zip)
UNITED STATES
(Country)		2. Date of Event Requiring Statement (Month/Day/Year)
05/04/2026		3. Issuer Name and Ticker or Trading Symbol
Rallybio Corp [ RLYB ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock623,879ISee Footnote(1)(2)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
1. Name and Address of Reporting Person*
ADAR1 Capital Management, LLC
(Last)(First)(Middle)
3503 WILD CHERRY DRIVE, BUILDING 9
(Street)
AUSTIN TEXAS 78738
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Schneeberger Daniel
(Last)(First)(Middle)
3503 WILD CHERRY DRIVE, BUILDING 9
(Street)
AUSTIN TEXAS 78738
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. The reported securities are owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC, and may be deemed to be indirectly beneficially owned by (i) ADAR1 Capital Management, LLC and (ii) Daniel Schneeberger, the sole manager of ADAR1 Capital Management, LLC.
2. For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.
ADAR1 Capital Management, LLC By: Daniel Schneeberger, Manager /s/ Daniel Schneeberger05/06/2026
/s/ Daniel Schneeberger05/06/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What does the Rallybio (RLYB) Form 3 filed by ADAR1 Capital show?

The Form 3 shows existing indirect holdings of Rallybio common stock. ADAR1 Capital-managed funds and accounts hold 623,879 shares, with ADAR1 and Daniel Schneeberger reported as 10% owners, while each disclaims beneficial ownership beyond any pecuniary interest.

How many Rallybio (RLYB) shares are reported as indirectly owned on this Form 3?

The filing reports 623,879 shares of Rallybio common stock indirectly held. These shares are owned by private investment funds and separately managed accounts managed by ADAR1 Capital Management, rather than directly by the named reporting persons.

Who are the reporting persons on the Rallybio (RLYB) Form 3 filing?

The reporting persons are ADAR1 Capital Management, LLC and Daniel Schneeberger. Both are listed as 10% owners, with the reported securities held by ADAR1-managed private investment funds and separately managed accounts rather than directly in their personal names.

Is this Rallybio (RLYB) Form 3 a new buy or sell of shares?

No, the Form 3 records existing holdings rather than a new transaction. It lists an indirect position of 623,879 Rallybio common shares, with no reported purchase or sale and transaction details marked as a holding entry.

How is beneficial ownership described for ADAR1 and Daniel Schneeberger in the Rallybio Form 3?

They may be deemed to indirectly beneficially own the reported securities through ADAR1-managed vehicles. However, each reporting person disclaims beneficial ownership of the securities except to the extent of his or its pecuniary interest, if any.