RLYB (Rallybio Corporation Common Stock)

Insider Trading Activity

Every open-market purchase and sale reported by RLYB officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.

Form 4 Filings
50
most recent
Open-Market Buys
5
code P
Sales
2
code S
Reporting Insiders
17
current holders
RLYB — Recent Form 4 Transactions (latest 2026-07-10)
FiledInsiderRole TypeSharesValue
2026-07-10 Helen M Boudreau Director M
2026-05-20 Daniel Schneeberger 10%+ Owner Buy
2026-05-15 ADAR1 Capital Management, LLC 10%+ Owner Buy
2026-05-13 Daniel Schneeberger 10%+ Owner Buy
2026-05-06 ADAR1 Capital Management, LLC 10%+ Owner Buy
2026-02-23 Jonathan I Lieber Chief Financial Officer MIXED
2026-02-20 MARTIN MACKAY Director A
2026-02-20 RONALD HUNT Director A
2025-05-15 Helen M Boudreau Director A
2025-05-15 Wendy Chung Director A
2025-05-15 RONALD HUNT Director A
2025-05-15 Robert Lorne Hopfner Director A
2025-05-15 Hui Liu Director A
2025-05-15 Paula Soteropoulos Director A
2025-05-15 MARTIN MACKAY Director A
2025-05-15 Christine A Nash Director A
2025-02-19 Jonathan I Lieber Chief Financial Officer A
2025-02-19 Stephen Uden Chief Executive Officer A
2025-02-19 Steven Ryder Chief Medical Officer A
2025-01-06 MARTIN MACKAY Director A
2025-01-06 Robert Lorne Hopfner Director A
2025-01-06 Hui Liu Director A
2025-01-06 RONALD HUNT Director A
2024-05-17 Wendy Chung Director A
2024-05-17 Christine A Nash Director A
2024-05-17 Robert Lorne Hopfner Director A
2024-05-17 RONALD HUNT Director A
2024-05-17 Helen M Boudreau Director A
2024-05-17 Hui Liu Director A
2024-05-17 KUSH PARMAR Director A
2024-05-17 Paula Soteropoulos Director A
2024-02-16 MARTIN MACKAY Executive Chairman A
2024-02-16 Steven Ryder Chief Medical Officer A
2024-02-16 Jonathan I Lieber Chief Financial Officer A
2024-02-16 Stephen Uden Chief Executive Officer A
2024-01-04 RONALD HUNT Director A
2024-01-04 KUSH PARMAR Director A
2023-05-19 Robert Lorne Hopfner Director A
2023-05-19 Helen M Boudreau Director A
2023-05-19 KUSH PARMAR Director A
2023-05-19 Christine A Nash Director A
2023-05-19 Hui Liu Director A
2023-05-19 Wendy Chung Director A
2023-05-19 RONALD HUNT Director A
2023-05-19 Paula Soteropoulos Director A
2023-03-16 Jonathan I Lieber See Remarks Buy
2023-03-09 SCOTT M ROCKLAGE 10%+ Owner Sell
2023-03-09 KUSH PARMAR Director Sell
2023-02-06 MARTIN MACKAY Chief Executive Officer A
2023-02-06 Steven Ryder Chief Medical Officer A
RLYB — Current Insider Holders
InsiderRole Shares HeldValue
10%+ Owner 926,152
10%+ Owner 909,843
10%+ Owner 524,347
10%+ Owner 309,871
Director 297,371
Director 291,599
Director 249,239
Director 211,798
211,798
10%+ Owner 175,762
10%+ Owner 162,760
10%+ Owner 156,469
Chief Executive Officer 89,790
Executive Chairman 89,329
See Remarks 34,076
Director 6,542
Chief Financial Officer 4,904
How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the RLYB quote page; the site-wide leaderboard is on the insider transactions hub.