Rallybio Corp
RLYB- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001739410
No open-market purchases or sales by Rallybio Corp insiders were filed in the last 90 days; 37 institutions reported holding it in 13F filings for Q2 2026, worth $65.0M in total; Viking Global Investors is the only superinvestor holding it.
13F holders, Q4 2025
Institutional positions in Rallybio Corp as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 46
- +2 vs. Q3 2025
- Shares held
- 24.9M
- −61.0K (−0.2%) vs. Q3 2025
- Total value
- $16.6M
- +$4.12M (+33.1%) vs. Q3 2025
- New holders
- 4
- 7 more added
- Sold out
- 2
- 11 more reduced
1 institution that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting RLYB on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 37 | $65.0M |
| Q1 2026 | 38 | $41.9M |
| Q4 2025 | 46 | $16.6M |
| Q3 2025 | 45 | $14.1M |
| Q2 2025 | 48 | $10.5M |
| Q1 2025 | 47 | $20.9M |
| Q4 2024 | 49 | $31.1M |
| Q3 2024 | 49 | $36.5M |
| Q2 2024 | 66 | $42.4M |
| Q1 2024 | 62 | $55.9M |
| Q4 2023 | 54 | $75.9M |
| Q3 2023 | 58 | $105.2M |
| Q2 2023 | 59 | $188.3M |
| Q1 2023 | 53 | $183.3M |
| Q4 2022 | 58 | $212.3M |
| Q3 2022 | 53 | $402.1M |
| Q2 2022 | 47 | $208.8M |
| Q1 2022 | 47 | $193.9M |
| Q4 2021 | 38 | $260.1M |
| Q3 2021 | 34 | $419.9M |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Rallybio Corp; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Viking Global Investors LPSuperinvestorViking Global Investors | 4,194,777 | $2.88M | 0.01% | 00.0% | Unchanged |
| Johnson & Johnson | 3,636,363 | $2.49M | 0.45% | 00.0% | Unchanged |
| 5AM Venture Management, LLC | 3,630,724 | $2.49M | 0.78% | 00.0% | Unchanged |
| TPG GP A, LLC | 3,028,414 | $2.09M | 0.08% | 00.0% | Unchanged |
| Pivotal bioVenture Partners Investment Advisor LLC | 2,404,644 | $1.65M | 0.64% | 00.0% | Unchanged |
| FMR LLC | 1,694,388 | $1.16M | 0.00% | 00.0% | Unchanged |
| Almitas Capital LLC | 1,529,653 | $1.05M | 0.23% | −9,074−0.6% | Reduced |
| Vanguard Group Inc | 1,016,249 | $697.1K | 0.00% | +16,622+1.7% | Added |
| Renaissance Technologies LLC | 835,692 | $573.4K | 0.00% | +120,892+16.9% | Added |
| Canaan Partners XI LLC | 450,000 | $308.7K | 0.23% | 00.0% | Unchanged |
| Mariner, LLC | 404,546 | $277.6K | 0.00% | 00.0% | Unchanged |
| Citadel Advisors LLC | 253,842 | $174.2K | 0.00% | −184,863−42.1% | Reduced |
| Geode Capital Management, LLC | 248,005 | $170.2K | 0.00% | +2,996+1.2% | Added |
| BlackRock, Inc. | 141,663 | $97.2K | 0.00% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 100,724 | $69.1K | 0.00% | −35,570−26.1% | Reduced |
| XTX Topco Ltd | 97,313 | $66.8K | 0.00% | +38,205+64.6% | Added |
| Acadian Asset Management LLC | 83,480 | $56.0K | 0.00% | −6,767−7.5% | Reduced |
| State Street Corp | 62,072 | $42.6K | 0.00% | 00.0% | Unchanged |
| Rangeley Capital, LLC | 40,000 | $27.4K | 0.02% | −43,007−51.8% | Reduced |
| Northern Trust Corp | 38,124 | $26.2K | 0.00% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 37,000 | $25.4K | 0.00% | +15,547+72.5% | Added |
| Prudential Financial Inc | 29,100 | $20.0K | 0.00% | −9,300−24.2% | Reduced |
| Virtu Financial LLC | 27,132 | $19.0K | 0.00% | −12,171−31.0% | Reduced |
| HRT Financial LP | 21,387 | $14.0K | 0.00% | −10,837−33.6% | Reduced |
| Resources Investment Advisors, LLC. | 20,000 | $13.7K | 0.00% | 00.0% | Unchanged |
| Two Sigma Advisers, LP | 19,300 | $13.2K | 0.00% | +19,300 | New |
| Gsa Capital Partners LLP | 19,303 | $13.0K | 0.00% | +19,303 | New |
| Ground Swell Capital, LLC | 15,399 | $10.6K | 0.02% | +15,399 | New |
| Great Valley Advisor Group, Inc. | 15,000 | $10.3K | 0.00% | 00.0% | Unchanged |
| Utah Retirement Systems | 13,240 | $9.08K | 0.00% | 00.0% | Unchanged |
| ACT Advisors, LLC. | 13,153 | $9.02K | 0.00% | +13,153 | New |
| Mercer Global Advisors Inc | 10,000 | $6.86K | 0.00% | 00.0% | Unchanged |
| Captrust Financial Advisors | 10,000 | $6.86K | 0.00% | 00.0% | Unchanged |
| Hartford Financial Management Inc. | 6,500 | $4.46K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 5,719 | $3.92K | 0.00% | 00.0% | Unchanged |
| Morgan Stanley | 4,640 | $3.18K | 0.00% | 00.0% | Unchanged |
| UBS Group AG | 4,577 | $3.14K | 0.00% | +2,206+93.0% | Added |
| Tower Research Capital LLC (TRC) | 4,524 | $3.10K | 0.00% | −5,657−55.6% | Reduced |
| SBI Securities Co., Ltd. | 4,248 | $2.92K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 3,932 | $2.70K | 0.00% | −5,963−60.3% | Reduced |
| BNP Paribas Arbitrage, SA | 980 | $672 | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 300 | $206 | 0.00% | 00.0% | Unchanged |
| Bank of America Corp | 251 | $172 | 0.00% | +35+16.2% | Added |
| JPMorgan Chase & Co | 82 | $56 | 0.00% | −800−90.7% | Reduced |
| Allworth Financial LP | 50 | $35 | 0.00% | 00.0% | Unchanged |
| AJU IB Investment Co., Ltd. | 754,678 | – | – | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 0 | $0 | 0.00% | −550−100.0% | Sold out |
| Jones Financial Companies LLLP | 0 | $0 | 0.00% | −90−100.0% | Sold out |
| New Leaf Venture Partners, L.L.C. | – | – | – | – | Not filed |