RallybioRLYB
13F holders, Q4 2025 (December 31)At the end of Q4 2025, 45 institutions reported holding Rallybio Corp. (RLYB) in their 13F filings, unchanged from Q3 2025. 4 opened new positions and 3 sold out. The largest holders were AJU IB Investment Co., Ltd. ($4.1M), Viking Global Investors ($2.9M) and Johnson & Johnson ($2.5M). 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
- 75120L100
- Latest filing quarter
- Q4 2025
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 4 | $46K |
| Exits | 3 | $5K |
All 13F filers, Q3 2025 → Q4 2025: 263,658 shares bought and 334,649 shares sold, net −70,991 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 45 holders
| AJU IB Investment Co., Ltd. | 18.18% | No change | 754,678 | $4.1M |
| Viking Global Investors | 0.01% | No change | 4,194,777 | $2.9M |
| Johnson & Johnson | 0.45% | No change | 3,636,363 | $2.5M |
| 5AM Venture Management, LLC | 0.78% | No change | 3,630,724 | $2.5M |
| TPG GP A, LLC | 0.08% | No change | 3,028,414 | $2.1M |
| Pivotal bioVenture Partners Investment Advisor LLC | 0.64% | No change | 2,404,644 | $1.6M |
| FMR LLC | 0.00% | No change | 1,694,388 | $1.2M |
| Almitas Capital LLC | 0.23% | Reduce -0.6% | 1,529,653 | $1.0M |
| Vanguard Group Inc. | 0.00% | Add +1.7% | 1,016,249 | $697K |
| Renaissance Technologies | 0.00% | Add +16.9% | 835,692 | $573K |
| Canaan Partners XI LLC | 0.23% | No change | 450,000 | $309K |
| Mariner, LLC | 0.00% | No change | 404,546 | $278K |
| Citadel Advisors | 0.00% | Reduce -42.1% | 253,842 | $174K |
| Geode Capital Management, LLC | 0.00% | Add +1.2% | 248,005 | $170K |
| BlackRock, Inc. | 0.00% | No change | 141,663 | $97K |
| Susquehanna International Group, LLP | 0.00% | Reduce -26.1% | 100,724 | $69K |
| XTX Topco Ltd | 0.00% | Add +64.6% | 97,313 | $67K |
| Acadian Asset Management LLC | 0.00% | Reduce -7.5% | 83,480 | $56K |
| State Street Corp. | 0.00% | No change | 62,072 | $43K |
| Rangeley Capital, LLC | 0.02% | Reduce -51.8% | 40,000 | $27K |
| Northern Trust Corp. | 0.00% | No change | 38,124 | $26K |
| Two Sigma Investments, LP | 0.00% | Add +72.5% | 37,000 | $25K |
| Prudential Financial Inc. | 0.00% | Reduce -24.2% | 29,100 | $20K |
| Virtu Financial LLC | 0.00% | Reduce -31.0% | 27,132 | $19K |
| HRT Financial LP | 0.00% | Reduce -33.6% | 21,387 | $14K |
| OneDigital Investment Advisors LLC | 0.00% | No change | 20,000 | $14K |
| Two Sigma Advisers, LP | 0.00% | New | 19,300 | $13K |
| Gsa Capital Partners LLP | 0.00% | New | 19,303 | $13K |
| Ground Swell Capital, LLC | 0.02% | New | 15,399 | $11K |
| Great Valley Advisor Group, Inc. | 0.00% | No change | 15,000 | $10K |
| Utah Retirement Systems | 0.00% | No change | 13,240 | $9K |
| ACT Advisors, LLC. | 0.00% | New | 13,153 | $9K |
| Mercer Global Advisors Inc. | 0.00% | No change | 10,000 | $7K |
| Hartford Financial Management Inc. | 0.00% | No change | 6,500 | $4K |
| Barclays PLC | 0.00% | No change | 5,719 | $4K |
| Morgan Stanley | 0.00% | No change | 4,640 | $3K |
| UBS Group AG | 0.00% | Add +93.0% | 4,577 | $3K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -55.6% | 4,524 | $3K |
| SBI Securities Co., Ltd. | 0.00% | No change | 4,248 | $3K |
| Citigroup Inc. | 0.00% | Reduce -60.3% | 3,932 | $3K |
| BNP Paribas Financial Markets | 0.00% | No change | 980 | $672 |
| Wells Fargo & Company | 0.00% | No change | 300 | $206 |
| Bank of America Corp. | 0.00% | Add +16.2% | 251 | $172 |
| JPMorgan Chase & Co. | 0.00% | Reduce -90.7% | 82 | $56 |
| Allworth Financial LP | 0.00% | No change | 50 | $35 |
"% of holder's portfolio" is RLYB's weight in each manager's 13F, not the share of Rallybio Corp. the manager owns.