Rallybio Corp (RLYB)
Data as of , from SEC Form 4 filings.
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About Rallybio Corp (RLYB)
Rallybio Corp files with the SEC under CIK 0001739410 and is classified as pharmaceutical preparations. We track it alongside the rest of the Health Care sector. The registration was withdrawn on 5 May 2026, so the planned offering is not going ahead in its filed form.
RLYB Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Option exercise | 12 | 93,944 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
RLYB insider transactions (Form 4)
3314 Form 4 filings on record, the earliest from May 13, 2025, newest first.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
 Jonathan I. Lieber - Officer | Option exercise | Common Stock | 3,910 | $6.08 | $24K | |
| Jonathan I. Lieber - Officer | Option exercise | Option (Right to Buy) | 3,910 | $0.00 | - | |
| Stephen Uden - Officer | Option exercise | Common Stock | 22,456 | $6.08 | $137K | |
| Stephen Uden - Officer | Option exercise | Option (Right to Buy) | 22,456 | $0.00 | - | |
| Jonathan I. Lieber - Officer | Option exercise | Common Stock | 5,000 | $6.08 | $30K | |
| Jonathan I. Lieber - Officer | Option exercise | Option (Right to Buy) | 5,000 | $0.00 | - | |
| Hui Liu - Director | Option exercise | Common Stock | 3,562 | $2.38 | $8K | |
| Hui Liu - Director | Option exercise | Common Stock | 8,482 | $7.60 | $64K | |
| Hui Liu - Director | Option exercise | Option (Right to Buy) | 3,562 | $0.00 | - | |
| Hui Liu - Director | Option exercise | Option (Right to Buy) | 8,482 | $5.60 footnote F2 | $47K | |
| ||||||
 Wendy Chung - Director | Option exercise | Common Stock | 3,562 | $2.38 | $8K | |
| Wendy Chung - Director | Option exercise | Option (Right to Buy) | 3,562 | $0.00 | - | |
| Helen M. Boudreau | Option exercise | Common Stock | 3,562 | $2.38 | $8K | |
| Helen M. Boudreau | Option exercise | Option (Right to Buy) | 3,562 | $0.00 | - | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 6,009 | $13.98 footnote F1 | $84K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 10,000 | $13.98 footnote F2 | $140K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 200 | $13.80 | $3K | |
| ||||||
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 4,081 | $13.80 footnote F1 | $56K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 75,178 | $14.00 | $1.05M | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 100 | $13.80 | $1K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 200 | $13.95 | $3K | |
| ||||||
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 5,100 | $14.00 footnote F1 | $71K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 25,000 | $14.00 | $350K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 19,900 | $14.00 | $279K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 800 | $13.83 footnote F2 | $11K | |
| ||||||
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 3,900 | $13.90 footnote F1 | $54K | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 116,904 | $13.97 footnote F2 | $1.63M | |
| ADAR1 Capital Management, LLC - 10% Owner | Open-market purchase | Common Stock | 35,101 | $14.00 footnote F3 | $491K | |
| ||||||
| Jonathan I. Lieber - Officer | Grant or award | Common Stock | 2,500 | $0.00 | - | |
| Jonathan I. Lieber - Officer | Open-market sale | Common Stock | 789 footnote F1 | $5.06 | $4K | |
| ||||||
| Martin Mackay - Director | Grant or award | Option (Right to Buy) | 18,055 | $3.60 | $65K | |
| Ronald Hunt - Director | Grant or award | Option (Right to Buy) | 14,305 | $3.60 footnote F2 | $51K | |
| ||||||
| Ronald Hunt - Director | Grant or award | Option (Right to Buy) | 28,500 | $0.00 | - | |
Item 5.02, 9.01
Item 1.01, 3.02, 5.01, 5.02, 7.01, 9.01
Item 1.02, 9.01
Item 5.02
RLYB insider trading FAQ
What is the latest insider trade for RLYB?
Rallybio Corp (RLYB) had 5 insider filings in the last 90 days, with the most recent on 2026-10-13. The full record for RLYB runs to 14 Form 4 filings, the earliest from 2025-05-13. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying RLYB stock?
No insider purchases of RLYB were filed in the last 90 days. 14 purchases are on record for this company.
How many insiders are selling RLYB stock?
No insider sales of RLYB were filed in the last 90 days. 1 sale is on record for this company.
Where can I see RLYB SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects RLYB Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Jonathan I. Lieber view on EDGAR
- - Stephen Uden view on EDGAR
- - Jonathan I. Lieber view on EDGAR
- - Hui Liu view on EDGAR
- - Wendy Chung view on EDGAR
- - Helen M. Boudreau view on EDGAR
- - ADAR1 Capital Management, LLC view on EDGAR
- - ADAR1 Capital Management, LLC view on EDGAR
- - ADAR1 Capital Management, LLC view on EDGAR
Related companies with recent insider activity
Learn more
- What the Form 4 transaction codes mean
- Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
- Insider activity in Health Care
- Where RLYB's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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