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 |
|---|---|---|---|---|---|
| Allworth Financial LP | 50 | $35 | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 82 | $56 | 0.00% | −800−90.7% | Reduced |
| Bank of America Corp | 251 | $172 | 0.00% | +35+16.2% | Added |
| Wells Fargo & Company | 300 | $206 | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 980 | $672 | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 3,932 | $2.70K | 0.00% | −5,963−60.3% | Reduced |
| SBI Securities Co., Ltd. | 4,248 | $2.92K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 4,524 | $3.10K | 0.00% | −5,657−55.6% | Reduced |
| UBS Group AG | 4,577 | $3.14K | 0.00% | +2,206+93.0% | Added |
| Morgan Stanley | 4,640 | $3.18K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 5,719 | $3.92K | 0.00% | 00.0% | Unchanged |
| Hartford Financial Management Inc. | 6,500 | $4.46K | 0.00% | 00.0% | Unchanged |
| 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 |
| ACT Advisors, LLC. | 13,153 | $9.02K | 0.00% | +13,153 | New |
| Utah Retirement Systems | 13,240 | $9.08K | 0.00% | 00.0% | Unchanged |
| Great Valley Advisor Group, Inc. | 15,000 | $10.3K | 0.00% | 00.0% | Unchanged |
| Ground Swell Capital, LLC | 15,399 | $10.6K | 0.02% | +15,399 | New |
| Gsa Capital Partners LLP | 19,303 | $13.0K | 0.00% | +19,303 | New |
| Two Sigma Advisers, LP | 19,300 | $13.2K | 0.00% | +19,300 | New |
| Resources Investment Advisors, LLC. | 20,000 | $13.7K | 0.00% | 00.0% | Unchanged |
| HRT Financial LP | 21,387 | $14.0K | 0.00% | −10,837−33.6% | Reduced |
| Virtu Financial LLC | 27,132 | $19.0K | 0.00% | −12,171−31.0% | Reduced |
| Prudential Financial Inc | 29,100 | $20.0K | 0.00% | −9,300−24.2% | Reduced |
| Two Sigma Investments, LP | 37,000 | $25.4K | 0.00% | +15,547+72.5% | Added |
| Northern Trust Corp | 38,124 | $26.2K | 0.00% | 00.0% | Unchanged |
| Rangeley Capital, LLC | 40,000 | $27.4K | 0.02% | −43,007−51.8% | Reduced |
| State Street Corp | 62,072 | $42.6K | 0.00% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 83,480 | $56.0K | 0.00% | −6,767−7.5% | Reduced |
| XTX Topco Ltd | 97,313 | $66.8K | 0.00% | +38,205+64.6% | Added |
| Susquehanna International Group, LLP | 100,724 | $69.1K | 0.00% | −35,570−26.1% | Reduced |
| BlackRock, Inc. | 141,663 | $97.2K | 0.00% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 248,005 | $170.2K | 0.00% | +2,996+1.2% | Added |
| Citadel Advisors LLC | 253,842 | $174.2K | 0.00% | −184,863−42.1% | Reduced |
| Mariner, LLC | 404,546 | $277.6K | 0.00% | 00.0% | Unchanged |
| Canaan Partners XI LLC | 450,000 | $308.7K | 0.23% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 835,692 | $573.4K | 0.00% | +120,892+16.9% | Added |
| Vanguard Group Inc | 1,016,249 | $697.1K | 0.00% | +16,622+1.7% | Added |
| Almitas Capital LLC | 1,529,653 | $1.05M | 0.23% | −9,074−0.6% | Reduced |
| FMR LLC | 1,694,388 | $1.16M | 0.00% | 00.0% | Unchanged |
| Pivotal bioVenture Partners Investment Advisor LLC | 2,404,644 | $1.65M | 0.64% | 00.0% | Unchanged |
| TPG GP A, LLC | 3,028,414 | $2.09M | 0.08% | 00.0% | Unchanged |
| 5AM Venture Management, LLC | 3,630,724 | $2.49M | 0.78% | 00.0% | Unchanged |
| Johnson & Johnson | 3,636,363 | $2.49M | 0.45% | 00.0% | Unchanged |
| Viking Global Investors LPSuperinvestorViking Global Investors | 4,194,777 | $2.88M | 0.01% | 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 |