Robert Lorne Hopfner - 12 Oct 2026 Form 4 Insider Report for Rallybio Corp (RLYB)

Reporting relationship: Director
Issuer ticker: RLYB
Reported as of: 12 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 14 Oct 2026, 16:34:53 UTC
Prior SEC filing: 22 Dec 2025
Source filing: View source filing
Reporting owner signature: By: /s/ Jonathan Lieber, Attorney-in-Fact

Filing notes and source

Key filing fact

Robert Lorne Hopfner filed Form 4 for Rallybio Corp (RLYB) on 14 Oct 2026.

Key facts

This page summarizes Robert Lorne Hopfner's Form 4 filing for Rallybio Corp (RLYB).
6 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 14 Oct 2026, 16:34.

Change

Previous filing in this sequence was filed on 22 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001551966 Primary reporting owner

Hopfner Robert Lorne

Relationship: Director
Address: C/O RALLYBIO CORPORATION, PO BOX 325, EAST BERLIN
Signature: By: /s/ Jonathan Lieber, Attorney-in-Fact
Signature date: 14 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

RLYB transaction

Common Stock

Options Exercise

Transaction value
Shares: +9,196
Change %
Price: $7.60^*
Shares after: 9,196
Date: 12 Oct 2026
Ownership: Direct

RLYB transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,562
Change %: +39%
Price: $2.38^*
Shares after: 12,758
Date: 12 Oct 2026
Ownership: Direct

RLYB transaction

Common Stock

Options Exercise

Transaction value
Shares: +2,062
Change %: +16%
Price: $15.28^*
Shares after: 14,820
Date: 12 Oct 2026
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

RLYB transaction Derivative

Option (Right to Buy)

Options Exercise

Transaction value
Shares: -9,196
Change %: -100%
Price: $0.5600^*
Shares after: 0
Date: 12 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 9,196
Exercise price: $7.60
Footnotes: F1, F2

RLYB transaction Derivative

Option (Right to Buy)

Options Exercise

Transaction value
Shares: -3,562
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 12 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,562
Exercise price: $2.38
Footnotes: F3

RLYB transaction Derivative

Option (Right to Buy)

Options Exercise

Transaction value
Shares: -2,062
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 12 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,062
Exercise price: $15.28
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote 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.

Footnote 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.

Footnote 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.

Footnote 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.