RallybioRLYB
13F holders, Q2 2026 (June 30)At the end of Q2 2026, 37 institutions reported holding Rallybio Corp. (RLYB) in their 13F filings, down 1 from Q1 2026. 9 opened new positions and 9 sold out. The largest holders were ADAR1 Capital Management, LLC ($14.8M), FMR LLC ($12.7M) and Viking Global Investors ($8.4M). 3 famous investors held it, including Andreas Halvorsen (0.0% of Viking Global Investors's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Rallybio Corp.
- CUSIP
- 75120L209
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 9 | $1.9M |
| Exits | 9 | $14.3M |
All 13F filers, Q1 2026 → Q2 2026: 1,280,634 shares bought and 1,787,514 shares sold, net −506,880 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 37 holders
| ADAR1 Capital Management, LLC | 0.70% | Add +4411.1% | 926,352 | $14.8M |
| FMR LLC | 0.00% | Add +0.2% | 794,720 | $12.7M |
| Viking Global Investors | 0.02% | No change | 524,347 | $8.4M |
| TPG GP A, LLC | 0.13% | No change | 378,551 | $6.1M |
| Pivotal bioVenture Partners Investment Advisor LLC | 1.56% | No change | 300,579 | $4.8M |
| Renaissance Technologies | 0.00% | Add +27.7% | 199,907 | $3.2M |
| Nantahala Capital Management, LLC | 0.18% | Reduce -37.3% | 188,422 | $3.0M |
| Vanguard Capital Management LLC | 0.00% | Add +54.0% | 172,497 | $2.8M |
| Almitas Capital LLC | 0.46% | Reduce -36.9% | 120,682 | $1.9M |
| Rangeley Capital, LLC | 1.65% | Add +248.0% | 104,850 | $1.7M |
| Citadel Advisors | 0.00% | Add +263.1% | 72,200 | $1.2M |
| Mariner, LLC | 0.00% | No change | 50,566 | $809K |
| Jane Street Group, LLC | 0.00% | New | 47,423 | $759K |
| Geode Capital Management, LLC | 0.00% | Reduce -9.5% | 32,047 | $513K |
| BlackRock, Inc. | 0.00% | Add +73.5% | 30,332 | $485K |
| HRT Financial LP | 0.00% | New | 25,657 | $410K |
| XTX Topco Ltd | 0.00% | Add +91.5% | 21,497 | $344K |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +24.2% | 16,820 | $269K |
| Two Sigma Investments, LP | 0.00% | New | 16,619 | $266K |
| State Street Corp. | 0.00% | New | 12,996 | $208K |
| Quadrature Capital Ltd | 0.00% | New | 12,995 | $208K |
| Dimensional Fund Advisors LP | 0.00% | No change | 11,280 | $180K |
| Vanguard Global Advisers, LLC | 0.00% | No change | 1,442 | $23K |
| Hartford Financial Management Inc. | 0.00% | No change | 812 | $13K |
| SBI Securities Co., Ltd. | 0.00% | Reduce -3.4% | 506 | $8K |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 434 | $7K |
| UBS Group AG | 0.00% | Reduce -98.2% | 146 | $2K |
| Truvestments Capital LLC | 0.00% | New | 129 | $2K |
| Morgan Stanley | 0.00% | Reduce -0.8% | 125 | $2K |
| BNP Paribas Financial Markets | 0.00% | No change | 120 | $2K |
| Fortitude Family Office, LLC | 0.00% | No change | 53 | $848 |
| Wells Fargo & Company | 0.00% | No change | 37 | $592 |
| EverSource Wealth Advisors, LLC | 0.00% | New | 31 | $496 |
| JPMorgan Chase & Co. | 0.00% | Reduce -99.6% | 9 | $145 |
| Allworth Financial LP | 0.00% | No change | 6 | $96 |
| Barclays PLC | 0.00% | New | 3 | $48 |
| Danske Bank A/S | 0.00% | No change | 1 | $16 |
"% of holder's portfolio" is RLYB's weight in each manager's 13F, not the share of Rallybio Corp. the manager owns.