Rallybio Corp
Ownership
Ownership Structure
Who owns Rallybio Corp (RLYB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 29.2% of the shares are freely tradable; institutional investors hold 98.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| ADAR1 Capital Management LLC | 17.44 | 926,352 | +4,411.1 | 06/30/2026 |
| FMR Inc | 14.96 | 794,720 | +0.2 | 06/30/2026 |
| Viking Global Investors LP | 9.87 | 524,347 | +0.0 | 06/30/2026 |
| TPG GP A, LLC | 7.13 | 378,551 | +0.0 | 06/30/2026 |
| Nantahala Capital Management, LLC | 7.09 | 376,844 | +25.3 | 06/30/2026 |
| Pivotal bioVenture Partners Investment Advisor LLC | 5.66 | 300,579 | +0.0 | 06/30/2026 |
| Renaissance Technologies Corp | 3.76 | 199,907 | +27.7 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.25 | 172,497 | +54.0 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Fidelity Growth Company Fund | 3.90 | 207,412 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.53 | 134,620 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Uden Stephen | Chief Executive Officer | 148,864 | 2,352,051 $ | Oct 27, 2026 | direct |
| Mackay Martin | Director | 125,032 | 1,975,506 $ | Nov 4, 2026 | direct |
| Lieber Jonathan I | Chief Financial Officer | 44,139 | 697,396 $ | Nov 2, 2026 | direct |
| Hunt Ronald | Director | 29,125 | 460,175 $ | Nov 4, 2026 | direct |
| Hopfner Robert Lorne | Director | 14,820 | 234,156 $ | Oct 12, 2026 | direct |
| Liu Hui | Director | 12,044 | 190,295 $ | Sep 24, 2026 | direct |
| Boudreau Helen M | Director | 8,604 | 135,943 $ | Oct 16, 2026 | direct |
| Soteropoulos Paula | Director | 6,544 | 103,395 $ | Oct 16, 2026 | direct |
| Chung Wendy | Director | 5,624 | 88,859 $ | Oct 26, 2026 | direct |
| Nash Christine A | Director | 3,562 | 56,280 $ | Oct 28, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nov 4, 2026 | Mackay Martin | Director | Other | 18,055 | 4.45 | 80,345 |
| Nov 4, 2026 | Mackay Martin | Director | Other | 3,562 | 2.38 | 8,478 |
| Nov 4, 2026 | Mackay Martin | Director | Other | 11,607 | 7.60 | 88,213 |
| Nov 4, 2026 | Hunt Ronald | Director | Other | 14,305 | 4.45 | 63,657 |
| Nov 2, 2026 | Lieber Jonathan I | Chief Financial Officer | Other | 7,124 | 14.88 | 106,005 |
| Oct 29, 2026 | Lieber Jonathan I | Chief Financial Officer | Other | 13,589 | 6.08 | 82,621 |
| Oct 29, 2026 | Lieber Jonathan I | Chief Financial Officer | Other | 7,875 | 14.88 | 117,180 |
| Oct 29, 2026 | Hunt Ronald | Director | Other | 2,062 | 15.28 | 31,507 |
| Oct 29, 2026 | Hunt Ronald | Director | Other | 9,196 | 7.60 | 69,890 |
| Oct 29, 2026 | Hunt Ronald | Director | Other | 3,562 | 2.38 | 8,478 |
| Oct 28, 2026 | Nash Christine A | Director | Other | 3,562 | 2.38 | 8,478 |
| Oct 27, 2026 | Uden Stephen | Chief Executive Officer | Other | 33,244 | 6.08 | 202,124 |
| Oct 27, 2026 | Lieber Jonathan I | Chief Financial Officer | Sell | 599 | 16.04 | 9,608 |
| Oct 26, 2026 | Lieber Jonathan I | Chief Financial Officer | Other | 2,500 | 0.00 | – |
| Oct 26, 2026 | Chung Wendy | Director | Other | 2,062 | 15.28 | 31,507 |
| Oct 16, 2026 | Soteropoulos Paula | Director | Other | 3,562 | 2.38 | 8,478 |
| Oct 16, 2026 | Boudreau Helen M | Director | Other | 2,062 | 15.28 | 31,507 |
| Oct 12, 2026 | Hopfner Robert Lorne | Director | Other | 2,062 | 15.28 | 31,507 |
| Oct 12, 2026 | Hopfner Robert Lorne | Director | Other | 3,562 | 2.38 | 8,478 |
| Oct 12, 2026 | Hopfner Robert Lorne | Director | Other | 9,196 | 7.60 | 69,890 |
| Oct 9, 2026 | Lieber Jonathan I | Chief Financial Officer | Other | 3,910 | 6.08 | 23,773 |
| Oct 6, 2026 | Uden Stephen | Chief Executive Officer | Other | 22,456 | 6.08 | 136,532 |
| Sep 29, 2026 | Lieber Jonathan I | Chief Financial Officer | Other | 5,000 | 6.08 | 30,400 |
| Sep 24, 2026 | Liu Hui | Director | Other | 8,482 | 7.60 | 64,463 |
| Sep 24, 2026 | Liu Hui | Director | Other | 3,562 | 2.38 | 8,478 |
| Sep 16, 2026 | Chung Wendy | Director | Other | 3,562 | 2.38 | 8,478 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 13, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.