Rallybio director exercises options for 14,820 shares

A Rallybio director's exercise spanned three price tranches, with per-share exercise prices of $7.60, $2.38 and $15.28.

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Rhea-AI Filing Summary

Rallybio Corp (RLYB) director Robert Lorne Hopfner exercised three options on October 12, 2026, acquiring 14,820 common shares. The options covered 9,196 shares at an exercise price of $7.60 per share, 3,562 at $2.38, and 2,062 at $15.28. All three options were issued or granted under Rallybio’s 2021 Equity Incentive Plan. The 9,196-share option was issued in lieu of $51,500 in retainer fees.

Insider Trade Summary

14,820 shares exercised/converted

Exercise 6 txns

Insider Hopfner Robert Lorne

Role Director

Type	Security	Shares	Price	Value
Exercise	Option (Right to Buy) ^{F2, F1}	9,196	$0.56	$5K
Exercise	Option (Right to Buy) ^F3	3,562	$0.00	$0.00
Exercise	Option (Right to Buy) ^F4	2,062	$0.00	$0.00
Exercise	Common Stock	9,196	$7.60	$70K
Exercise	Common Stock	3,562	$2.38	$8K
Exercise	Common Stock	2,062	$15.28	$32K

Holdings After Transaction: Option (Right to Buy) — 0 contracts (Direct); Common Stock — 14,820 shares (Direct)

Footnotes (4)

F1. The option vests as to the underlying shares of Common Stock in 12 equal installments, each on the last day of each month of calendar year 2025.
F2. This option was issued to the reporting person pursuant to the Company's 2021 Equity Incentive Plan in lieu of retainer fees of $51,500.
F3. The option was granted under the Company's 2021 Equity Incentive Plan. The option vests on the earlier of May 13, 2026 or the date of the Company's 2026 Annual Meeting of Stockholders.
F4. The option was granted under the Company's 2021 Equity Incentive Plan. The option vests on the earlier of May 15, 2025 or the date of the Company's 2025 Annual Meeting of Stockholders.

Key Figures

Shares acquired through exercises: 14,820 shares Shares underlying first exercised option: 9,196 shares Exercise price for first option: $7.60 per share +4 more

7 metrics

Shares acquired through exercises 14,820 shares Three option exercises on October 12, 2026

Shares underlying first exercised option 9,196 shares Exercise on October 12, 2026

Exercise price for first option $7.60 per share Option covering 9,196 shares

Shares underlying second exercised option 3,562 shares Exercise on October 12, 2026

Exercise price for second option $2.38 per share Option covering 3,562 shares

Shares underlying third exercised option 2,062 shares Exercise on October 12, 2026

Exercise price for third option $15.28 per share Option covering 2,062 shares

Key Terms

2021 Equity Incentive Plan, retainer fees, vests

3 terms

2021 Equity Incentive Plan financial

"pursuant to the Company's 2021 Equity Incentive Plan"

retainer fees financial

"in lieu of retainer fees of $51,500"

vests financial

"The option vests on the earlier of May 13, 2026"

FAQ

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

How many RLYB shares did Robert Lorne Hopfner acquire through option exercises?

Robert Lorne Hopfner acquired 14,820 Rallybio common shares by exercising three options on October 12, 2026. The options covered 9,196 shares at $7.60 per share, 3,562 at $2.38, and 2,062 at $15.28.

What were the vesting terms for Hopfner's RLYB options?

The 9,196-share option vests in 12 equal installments, each on the last day of each month of calendar year 2025. The 3,562-share option vests on the earlier of May 13, 2026 or the date of Rallybio’s 2026 Annual Meeting of Stockholders; the 2,062-share option vests on the earlier of May 15, 2025 or the date of Rallybio’s 2025 Annual Meeting of Stockholders.

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

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Available on EDGAR 10/14/2026 - 04:35 PM EDT Accepted by SEC EDGAR 10/14/2026 - 04:34 PM EDT

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^*

Hopfner Robert Lorne

(Last)

(First)

(Middle)

C/O RALLYBIO CORPORATION

PO BOX 325

(Street)

EAST BERLIN

CONNECTICUT

06023

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/12/2026

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

X	Form filed by One Reporting Person
	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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	10/12/2026		M		9,196	A	$7.6	9,196	D
Common Stock	10/12/2026		M		3,562	A	$2.38	12,758	D
Common Stock	10/12/2026		M		2,062	A	$15.28	14,820	D

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Option (Right to Buy)	$7.6	10/12/2026		M			9,196	⁽¹⁾	01/02/2035	Common Stock	9,196	$0.56⁽²⁾	0	D
Option (Right to Buy)	$2.38	10/12/2026		M			3,562	⁽³⁾	05/13/2035	Common Stock	3,562	$0	0	D
Option (Right to Buy)	$15.28	10/12/2026		M			2,062	⁽⁴⁾	05/15/2034	Common Stock	2,062	$0	0	D

Explanation of Responses:

1. The option vests as to the underlying shares of Common Stock in 12 equal installments, each on the last day of each month of calendar year 2025.

2. This option was issued to the reporting person pursuant to the Company's 2021 Equity Incentive Plan in lieu of retainer fees of $51,500.

3. The option was granted under the Company's 2021 Equity Incentive Plan. The option vests on the earlier of May 13, 2026 or the date of the Company's 2026 Annual Meeting of Stockholders.

4. The option was granted under the Company's 2021 Equity Incentive Plan. The option vests on the earlier of May 15, 2025 or the date of the Company's 2025 Annual Meeting of Stockholders.

	By: /s/ Jonathan Lieber, Attorney-in-Fact	10/14/2026
	** 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)

Source: View Original Filing on SEC EDGAR