RLYB Rallybio Corporation
Rallybio Corporation (RLYB) Institutional Ownership
What the institutions did with RLYB last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| ADAR1 Capital Management, LLC | 926.4K | 21.8% |
| FMR LLC | 794.7K | 18.7% |
| VIKING GLOBAL INVESTORS LP | 524.3K | 12.3% |
| TPG GP A, LLC | 378.6K | 8.9% |
| Nantahala Capital Management, LLC | 376.8K | 8.9% |
| Pivotal bioVenture Partners Investment Advisor LLC | 300.6K | 7.1% |
| RENAISSANCE TECHNOLOGIES LLC | 199.9K | 4.7% |
| VANGUARD CAPITAL MANAGEMENT LLC | 172.5K | 4.1% |
| Almitas Capital LLC | 120.7K | 2.8% |
| Rangeley Capital, LLC | 104.9K | 2.5% |
| CITADEL ADVISORS LLC | 72.2K | 1.7% |
| Mariner, LLC | 50.6K | 1.2% |
| JANE STREET GROUP, LLC | 47.4K | 1.1% |
| GEODE CAPITAL MANAGEMENT, LLC | 32.0K | 0.8% |
| BlackRock, Inc. | 30.3K | 0.7% |
| HRT FINANCIAL LP | 25.7K | 0.6% |
| XTX Topco Ltd | 21.5K | 0.5% |
| VANGUARD FIDUCIARY TRUST CO | 16.8K | 0.4% |
| TWO SIGMA INVESTMENTS, LP | 16.6K | 0.4% |
| STATE STREET CORP | 13.0K | 0.3% |
| Quadrature Capital Ltd | 13.0K | 0.3% |
| DIMENSIONAL FUND ADVISORS LP | 11.3K | 0.3% |
| Vanguard Global Advisers, LLC | 1.4K | 0.0% |
| Hartford Financial Management Inc. | 812 | 0.0% |
| SBI Securities Co., Ltd. | 506 | 0.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| ADAR1 Capital Management, LLC | Increased | 20.5K | 926.4K | +905.8K |
| Cormorant Asset Management, LP | Sold Out | 400.0K | 0 | -400.0K |
| Balyasny Asset Management L.P. | Sold Out | 376.6K | 0 | -376.6K |
| Laurion Capital Management LP | Sold Out | 302.8K | 0 | -302.8K |
| 5AM Venture Management, LLC | Sold Out | 291.8K | 0 | -291.8K |
| JOHNSON & JOHNSON | Sold Out | 152.9K | 0 | -152.9K |
| Nantahala Capital Management, LLC | Increased | 300.6K | 376.8K | +76.2K |
| Rangeley Capital, LLC | Increased | 30.1K | 104.9K | +74.7K |
| Almitas Capital LLC | Reduced | 191.2K | 120.7K | -70.5K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 112.0K | 172.5K | +60.5K |
| CITADEL ADVISORS LLC | Increased | 19.9K | 72.2K | +52.3K |
| JANE STREET GROUP, LLC | New | 0 | 47.4K | +47.4K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 156.5K | 199.9K | +43.4K |
| DELTEC ASSET MANAGEMENT LLC | Sold Out | 33.8K | 0 | -33.8K |
| HRT FINANCIAL LP | New | 0 | 25.7K | +25.7K |
| GTS SECURITIES LLC | Sold Out | 22.0K | 0 | -22.0K |
| TWO SIGMA INVESTMENTS, LP | New | 0 | 16.6K | +16.6K |
| STATE STREET CORP | New | 0 | 13.0K | +13.0K |
| Quadrature Capital Ltd | New | 0 | 13.0K | +13.0K |
| BlackRock, Inc. | Increased | 17.5K | 30.3K | +12.8K |
| ACADIAN ASSET MANAGEMENT LLC | Sold Out | 10.4K | 0 | -10.4K |
| XTX Topco Ltd | Increased | 11.2K | 21.5K | +10.3K |
| UBS Group AG | Reduced | 7.9K | 146 | -7.8K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 35.4K | 32.0K | -3.4K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 13.5K | 16.8K | +3.3K |
| JPMORGAN CHASE & CO | Reduced | 2.5K | 9 | -2.5K |
| FMR LLC | Increased | 793.5K | 794.7K | +1.3K |
| Tower Research Capital LLC (TRC) | Sold Out | 907 | 0 | -907 |
| Caitong International Asset Management Co., Ltd | New | 0 | 434 | +434 |
| Truvestments Capital LLC | New | 0 | 129 | +129 |
| EverSource Wealth Advisors, LLC | New | 0 | 31 | +31 |
| SBI Securities Co., Ltd. | Reduced | 524 | 506 | -18 |
| BARCLAYS PLC | New | 0 | 3 | +3 |
| MORGAN STANLEY | Reduced | 126 | 125 | -1 |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.