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, Q2 2026
Institutional positions in Rallybio Corp as of Jun 30, 2026. 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
- 37
- −1 vs. Q1 2026
- Shares held
- 4.07M
- −601.2K (−12.9%) vs. Q1 2026
- Total value
- $65.0M
- +$23.2M (+55.4%) vs. Q1 2026
- New holders
- 9
- 9 more added
- Sold out
- 10
- 7 more reduced
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Rallybio Corp; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| ADAR1 Capital Management, LLC | 926,352 | $14.8M | 0.70% | +905,817+4,411.1% | Added |
| FMR LLC | 794,720 | $12.7M | 0.00% | +1,269+0.2% | Added |
| Viking Global Investors LPSuperinvestorViking Global Investors | 524,347 | $8.39M | 0.02% | 00.0% | Unchanged |
| TPG GP A, LLC | 378,551 | $6.06M | 0.12% | 00.0% | Unchanged |
| Pivotal bioVenture Partners Investment Advisor LLC | 300,579 | $4.81M | 1.56% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 199,907 | $3.20M | 0.00% | +43,380+27.7% | Added |
| Nantahala Capital Management, LLC | 188,422 | $3.01M | 0.18% | −112,213−37.3% | Reduced |
| Vanguard Capital Management LLC | 172,497 | $2.76M | 0.00% | +60,457+54.0% | Added |
| Almitas Capital LLC | 120,682 | $1.93M | 0.46% | −70,524−36.9% | Reduced |
| Rangeley Capital, LLC | 104,850 | $1.68M | 1.64% | +74,720+248.0% | Added |
| Citadel Advisors LLC | 72,200 | $1.16M | 0.00% | +52,314+263.1% | Added |
| Mariner, LLC | 50,566 | $809.1K | 0.00% | 00.0% | Unchanged |
| Jane Street Group, LLC | 47,423 | $758.8K | 0.00% | +47,423 | New |
| Geode Capital Management, LLC | 32,047 | $512.9K | 0.00% | −3,378−9.5% | Reduced |
| BlackRock, Inc. | 30,332 | $485.3K | 0.00% | +12,846+73.5% | Added |
| HRT Financial LP | 25,657 | $410.0K | 0.00% | +25,657 | New |
| XTX Topco Ltd | 21,497 | $344.0K | 0.00% | +10,271+91.5% | Added |
| Vanguard Fiduciary Trust Co | 16,820 | $269.1K | 0.00% | +3,273+24.2% | Added |
| Two Sigma Investments, LP | 16,619 | $265.9K | 0.00% | +16,619 | New |
| State Street Corp | 12,996 | $207.9K | 0.00% | +12,996 | New |
| Quadrature Capital Ltd | 12,995 | $207.9K | 0.00% | +12,995 | New |
| Dimensional Fund Advisors LP | 11,280 | $180.5K | 0.00% | 00.0% | Unchanged |
| Vanguard Global Advisers, LLC | 1,442 | $23.1K | 0.00% | 00.0% | Unchanged |
| Hartford Financial Management Inc. | 812 | $13.0K | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 506 | $8.10K | 0.00% | −18−3.4% | Reduced |
| Caitong International Asset Management Co., Ltd | 434 | $6.94K | 0.00% | +434 | New |
| UBS Group AG | 146 | $2.34K | 0.00% | −7,768−98.2% | Reduced |
| Truvestments Capital LLC | 129 | $2.06K | 0.00% | +129 | New |
| Morgan Stanley | 125 | $2.00K | 0.00% | −1−0.8% | Reduced |
| BNP Paribas Arbitrage, SA | 120 | $1.92K | 0.00% | 00.0% | Unchanged |
| Fortitude Family Office, LLC | 53 | $848 | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 37 | $592 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 31 | $496 | 0.00% | +31 | New |
| JPMorgan Chase & Co | 9 | $145 | 0.00% | −2,488−99.6% | Reduced |
| Allworth Financial LP | 6 | $96 | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 3 | $48 | 0.00% | +3 | New |
| Danske Bank A/S | 1 | $16 | 0.00% | 00.0% | Unchanged |
| Cormorant Asset Management, LP | 0 | $0 | 0.00% | −400,000−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −376,573−100.0% | Sold out |
| Laurion Capital Management LP | 0 | $0 | 0.00% | −302,756−100.0% | Sold out |
| 5AM Venture Management, LLC | 0 | $0 | 0.00% | −291,788−100.0% | Sold out |
| Johnson & Johnson | 0 | $0 | 0.00% | −152,901−100.0% | Sold out |
| AJU IB Investment Co., Ltd. | 0 | $0 | 0.00% | −94,334−100.0% | Sold out |
| Deltec Asset Management LLC | 0 | $0 | 0.00% | −33,750−100.0% | Sold out |
| GTS Securities LLC | 0 | $0 | 0.00% | −22,016−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −10,433−100.0% | Sold out |
| Tower Research Capital LLC (TRC) | 0 | $0 | 0.00% | −907−100.0% | Sold out |