RallybioRLYB
13F holders, Q3 2025 (September 30)At the end of Q3 2025, 45 institutions reported holding Rallybio Corp. (RLYB) in their 13F filings, down 3 from Q2 2025. 6 opened new positions and 9 sold out. The largest holders were Viking Global Investors ($2.1M), Johnson & Johnson ($1.8M) and 5AM Venture Management, LLC ($1.8M). 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 Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 6 | $76K |
| Exits | 9 | $892K |
All 13F filers, Q2 2025 → Q3 2025: 967,334 shares bought and 3,866,310 shares sold, net −2,898,976 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 45 holders
| Viking Global Investors | 0.01% | No change | 4,194,777 | $2.1M |
| Johnson & Johnson | 0.36% | No change | 3,636,363 | $1.8M |
| 5AM Venture Management, LLC | 0.66% | No change | 3,630,724 | $1.8M |
| New Leaf Venture Partners, L.L.C. | 3.83% | No change | 3,301,603 | $1.6M |
| TPG GP A, LLC | 0.08% | No change | 3,028,414 | $1.5M |
| Pivotal bioVenture Partners Investment Advisor LLC | 0.69% | No change | 2,404,644 | $1.2M |
| FMR LLC | 0.00% | Reduce -9.4% | 1,694,388 | $846K |
| Almitas Capital LLC | 0.18% | Reduce -15.3% | 1,538,727 | $768K |
| Vanguard Group Inc. | 0.00% | Add +9.9% | 999,627 | $499K |
| AJU IB Investment Co., Ltd. | 0.33% | No change | 754,678 | $377K |
| Renaissance Technologies | 0.00% | Add +47.4% | 714,800 | $357K |
| Canaan Partners XI LLC | 0.22% | Reduce -52.2% | 450,000 | $225K |
| Citadel Advisors | 0.00% | Add +576.1% | 438,705 | $219K |
| Mariner, LLC | 0.00% | No change | 404,546 | $202K |
| Geode Capital Management, LLC | 0.00% | No change | 245,009 | $122K |
| BlackRock, Inc. | 0.00% | Reduce -8.4% | 141,663 | $71K |
| Susquehanna International Group, LLP | 0.00% | Add +485.9% | 136,294 | $68K |
| Acadian Asset Management LLC | 0.00% | No change | 90,247 | $44K |
| Rangeley Capital, LLC | 0.04% | New | 83,007 | $41K |
| State Street Corp. | 0.00% | No change | 62,072 | $31K |
| XTX Topco Ltd | 0.00% | Add +6.5% | 59,108 | $29K |
| Virtu Financial LLC | 0.00% | Reduce -30.8% | 39,303 | $20K |
| Prudential Financial Inc. | 0.00% | New | 38,400 | $19K |
| Northern Trust Corp. | 0.00% | No change | 38,124 | $19K |
| HRT Financial LP | 0.00% | Add +8.8% | 32,224 | $16K |
| Two Sigma Investments, LP | 0.00% | Reduce -66.4% | 21,453 | $11K |
| OneDigital Investment Advisors LLC | 0.00% | New | 20,000 | $10K |
| Great Valley Advisor Group, Inc. | 0.00% | No change | 15,000 | $7K |
| Utah Retirement Systems | 0.00% | No change | 13,240 | $7K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +38.7% | 10,181 | $5K |
| Mercer Global Advisors Inc. | 0.00% | No change | 10,000 | $5K |
| Captrust Financial Advisors | 0.00% | No change | 10,000 | $5K |
| Citigroup Inc. | 0.00% | New | 9,895 | $5K |
| Hartford Financial Management Inc. | 0.00% | No change | 6,500 | $3K |
| Barclays PLC | 0.00% | Reduce -62.8% | 5,719 | $3K |
| Morgan Stanley | 0.00% | Reduce -87.3% | 4,640 | $2K |
| SBI Securities Co., Ltd. | 0.00% | Reduce -4.5% | 4,248 | $2K |
| UBS Group AG | 0.00% | Reduce -98.0% | 2,371 | $1K |
| BNP Paribas Financial Markets | 0.00% | Reduce -0.3% | 980 | $489 |
| JPMorgan Chase & Co. | 0.00% | No change | 882 | $440 |
| Rockefeller Capital Management L.P. | 0.00% | New | 550 | $274 |
| Wells Fargo & Company | 0.00% | Reduce -99.3% | 300 | $150 |
| Bank of America Corp. | 0.00% | Reduce -97.5% | 216 | $107 |
| Jones Financial Companies LLLP | 0.00% | New | 90 | $50 |
| Allworth Financial LP | 0.00% | No change | 50 | $25 |
"% of holder's portfolio" is RLYB's weight in each manager's 13F, not the share of Rallybio Corp. the manager owns.