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, Q3 2025
Institutional positions in Rallybio Corp as of Sep 30, 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
- 45
- −3 vs. Q2 2025
- Shares held
- 28.3M
- −2.90M (−9.3%) vs. Q2 2025
- Total value
- $14.1M
- +$3.60M (+34.2%) vs. Q2 2025
- New holders
- 6
- 7 more added
- Sold out
- 9
- 13 more reduced
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Rallybio Corp; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Viking Global Investors LPSuperinvestorViking Global Investors | 4,194,777 | $2.09M | 0.01% | 00.0% | Unchanged |
| Johnson & Johnson | 3,636,363 | $1.81M | 0.36% | 00.0% | Unchanged |
| 5AM Venture Management, LLC | 3,630,724 | $1.81M | 0.66% | 00.0% | Unchanged |
| New Leaf Venture Partners, L.L.C. | 3,301,603 | $1.65M | 3.83% | 00.0% | Unchanged |
| TPG GP A, LLC | 3,028,414 | $1.51M | 0.08% | 00.0% | Unchanged |
| Pivotal bioVenture Partners Investment Advisor LLC | 2,404,644 | $1.20M | 0.69% | 00.0% | Unchanged |
| FMR LLC | 1,694,388 | $845.5K | 0.00% | −175,888−9.4% | Reduced |
| Almitas Capital LLC | 1,538,727 | $767.8K | 0.18% | −278,765−15.3% | Reduced |
| Vanguard Group Inc | 999,627 | $498.8K | 0.00% | +89,686+9.9% | Added |
| AJU IB Investment Co., Ltd. | 754,678 | $377.3K | 0.33% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 714,800 | $356.7K | 0.00% | +229,768+47.4% | Added |
| Canaan Partners XI LLC | 450,000 | $224.6K | 0.22% | −490,984−52.2% | Reduced |
| Citadel Advisors LLC | 438,705 | $218.9K | 0.00% | +373,821+576.1% | Added |
| Mariner, LLC | 404,546 | $201.9K | 0.00% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 245,009 | $122.3K | 0.00% | 00.0% | Unchanged |
| BlackRock, Inc. | 141,663 | $70.7K | 0.00% | −12,985−8.4% | Reduced |
| Susquehanna International Group, LLP | 136,294 | $68.0K | 0.00% | +113,031+485.9% | Added |
| Acadian Asset Management LLC | 90,247 | $44.0K | 0.00% | 00.0% | Unchanged |
| Rangeley Capital, LLC | 83,007 | $41.4K | 0.04% | +83,007 | New |
| State Street Corp | 62,072 | $31.0K | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 59,108 | $29.5K | 0.00% | +3,629+6.5% | Added |
| Virtu Financial LLC | 39,303 | $20.0K | 0.00% | −17,459−30.8% | Reduced |
| Prudential Financial Inc | 38,400 | $19.2K | 0.00% | +38,400 | New |
| Northern Trust Corp | 38,124 | $19.0K | 0.00% | 00.0% | Unchanged |
| HRT Financial LP | 32,224 | $16.0K | 0.00% | +2,617+8.8% | Added |
| Two Sigma Investments, LP | 21,453 | $10.7K | 0.00% | −42,333−66.4% | Reduced |
| Resources Investment Advisors, LLC. | 20,000 | $9.98K | 0.00% | +20,000 | New |
| Great Valley Advisor Group, Inc. | 15,000 | $7.49K | 0.00% | 00.0% | Unchanged |
| Utah Retirement Systems | 13,240 | $6.61K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 10,181 | $5.08K | 0.00% | +2,840+38.7% | Added |
| Mercer Global Advisors Inc | 10,000 | $4.99K | 0.00% | 00.0% | Unchanged |
| Captrust Financial Advisors | 10,000 | $4.99K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 9,895 | $4.94K | 0.00% | +9,895 | New |
| Hartford Financial Management Inc. | 6,500 | $3.24K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 5,719 | $2.85K | 0.00% | −9,671−62.8% | Reduced |
| Morgan Stanley | 4,640 | $2.31K | 0.00% | −31,844−87.3% | Reduced |
| SBI Securities Co., Ltd. | 4,248 | $2.12K | 0.00% | −200−4.5% | Reduced |
| UBS Group AG | 2,371 | $1.18K | 0.00% | −117,871−98.0% | Reduced |
| BNP Paribas Arbitrage, SA | 980 | $489 | 0.00% | −3−0.3% | Reduced |
| JPMorgan Chase & Co | 882 | $440 | 0.00% | 00.0% | Unchanged |
| Rockefeller Capital Management L.P. | 550 | $274 | 0.00% | +550 | New |
| Wells Fargo & Company | 300 | $150 | 0.00% | −39,732−99.3% | Reduced |
| Bank of America Corp | 216 | $107 | 0.00% | −8,557−97.5% | Reduced |
| Jones Financial Companies LLLP | 90 | $50 | 0.00% | +90 | New |
| Allworth Financial LP | 50 | $25 | 0.00% | 00.0% | Unchanged |
| Standard Life Aberdeen plc | 0 | $0 | 0.00% | −1,595,262−100.0% | Sold out |
| Laurion Capital Management LP | 0 | $0 | 0.00% | −735,543−100.0% | Sold out |
| Millennium Management LLC | 0 | $0 | 0.00% | −179,839−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −88,900−100.0% | Sold out |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −15,153−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −11,742−100.0% | Sold out |
| HSBC Holdings PLC | 0 | $0 | 0.00% | −10,520−100.0% | Sold out |
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −2,209−100.0% | Sold out |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −850−100.0% | Sold out |