Rallybio insider funds buy 50,800 shares

Rhea-AI Filing Summary

Rallybio Corp reported that private investment funds and separately managed accounts managed by ADAR1 Capital Management, LLC, which may be deemed to be indirectly beneficially owned by ADAR1 and Daniel Schneeberger, completed a series of open-market purchases of common stock. On May 11–12, 2026, these accounts bought a total of 50,800 shares of Rallybio common stock in four transactions at weighted average prices around $13.83–$14.00 per share, within disclosed trading ranges from $13.75 to $14.00. Following the most recent transaction, the filing reports 830,584 shares indirectly owned. The reporting persons disclaim beneficial ownership of the securities beyond any pecuniary interest.

Insider Trade Summary

Net Buyer: 50,800 shares

Net Buy 4 txns

Insider ADAR1 Capital Management, LLC, Schneeberger Daniel

Role 10% Owner | 10% Owner

Bought 50,800 shs ($711K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	800	$13.8288	$11K
Purchase	Common Stock	5,100	$13.9984	$71K
Purchase	Common Stock	25,000	$14.00	$350K
Purchase	Common Stock	19,900	$14.00	$279K

Holdings After Transaction: Common Stock — 830,584 shares (Indirect, See Footnote)

Footnotes (4)

1. F1. The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.9164 to $14.0000, inclusive. Each Reporting Person undertakes to provide to Rallybio Corp, any security holder of Rallybio Corp or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
2. F2. The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.7500 to $13.9300, inclusive. Each Reporting Person undertakes to provide to Rallybio Corp, any security holder of Rallybio Corp or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
3. F3. 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.
4. F4. 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.

Key Figures

Total shares purchased: 50,800 shares Shares after latest transaction: 830,584 shares Purchase price per share: $14.0000 per share +4 more

7 metrics

Total shares purchased 50,800 shares Open-market purchases on May 11–12, 2026

Shares after latest transaction 830,584 shares Indirect holdings reported following May 12, 2026 purchase

Purchase price per share $14.0000 per share Two May 11, 2026 transactions in common stock

Purchase price per share $13.8288 per share May 12, 2026 open-market common stock purchase

Trading price range $13.9164–$14.0000 Weighted-average price range in one transaction footnote

Trading price range $13.7500–$13.9300 Weighted-average price range in another transaction footnote

Number of buy transactions 4 transactions All coded P as open-market purchases of common stock

Key Terms

open-market purchase, weighted average price, indirectly beneficially owned, pecuniary interest, +1 more

5 terms

open-market purchase financial

"transaction_action: open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

weighted average price financial

"The reported price is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

indirectly beneficially owned financial

"may be deemed to be indirectly beneficially owned by (i) ADAR1..."

pecuniary interest financial

"except to the extent of his/its pecuniary interest therein, if any"

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.

FAQ

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

What insider transactions did Rallybio Corp (RLYB) report in this Form 4?

The Form 4 reports four open-market purchases of Rallybio common stock totaling 50,800 shares. These transactions were executed on May 11–12, 2026 by accounts managed by ADAR1 Capital Management, LLC at prices around the mid‑teens per share.

Who made the recent Rallybio (RLYB) insider share purchases?

The purchases were made by private investment funds and separately managed accounts managed by ADAR1 Capital Management, LLC. The securities may be deemed indirectly beneficially owned by ADAR1 and Daniel Schneeberger, subject to their pecuniary interest and formal ownership disclaimers.

How many Rallybio (RLYB) shares were bought and at what prices?

Accounts managed by ADAR1 bought 50,800 Rallybio common shares in total. Weighted average prices per transaction ranged from about $13.83 to $14.00, with individual trades occurring between $13.75 and $14.00 per share, as disclosed in the footnotes.

What is the reported Rallybio (RLYB) share position after these insider purchases?

After the latest reported purchase, the filing shows 830,584 Rallybio common shares indirectly owned. This figure reflects holdings of the private funds and managed accounts overseen by ADAR1 Capital Management, LLC, as reported for Section 16 purposes in the Form 4.

Are the Rallybio (RLYB) insider trades described as open-market purchases?

Yes. Each transaction is classified as an open-market purchase of Rallybio common stock. The Form 4 specifies transaction code P with a description of purchases in the open market or private transactions, and provides weighted average prices and trading ranges.

How do the Rallybio (RLYB) Form 4 filers describe their beneficial ownership?

The reporting persons state the securities are owned directly by funds and managed accounts of ADAR1 and may be deemed indirectly owned by them. They disclaim beneficial ownership of the shares except to the extent of any pecuniary interest in those securities.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 05/13/2026 - 09:22 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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. Issuer Name and Ticker or Trading Symbol
Rallybio Corp [ RLYB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/11/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/11/2026		P		5,100	A	$13.9984(1)	784,884	I	See Footnote(3)(4)
Common Stock	05/11/2026		P		25,000	A	$14	809,884	I	See Footnote(3)(4)
Common Stock	05/11/2026		P		19,900	A	$14	829,784	I	See Footnote(3)(4)
Common Stock	05/12/2026		P		800	A	$13.8288(2)	830,584	I	See Footnote(3)(4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount 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

	Director	X	10% 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

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.9164 to $14.0000, inclusive. Each Reporting Person undertakes to provide to Rallybio Corp, any security holder of Rallybio Corp or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

2. The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.7500 to $13.9300, inclusive. Each Reporting Person undertakes to provide to Rallybio Corp, any security holder of Rallybio Corp or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

3. 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.

4. 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 Schneeberger	05/13/2026
	/s/ Daniel Schneeberger	05/13/2026
	** Signature of Reporting Person	Date
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 4 (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 4: SEC 1474 (03-26)