RALLYBIO CORP (RLYB)
Institutional ownership reported to the SEC as of Q2 2026, across 20 quarters.
Institutions report 11,862,795 shares against 5,310,499 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| ADAR1 Capital Management, LLC | $14.8M | 926,352 | 0.68% | 2q | +4411.1%+$14.5M |
| CITADEL ADVISORS LLC | $12.7M | 7,705,787 | 0.00% | 2q | +38649.8%+$12.7M |
| FMR LLC | $12.7M | 794,720 | 0.00% | 2q | HELD |
| VIKING GLOBAL INVESTORS LP | $8.4M | 524,347 | 0.02% | 2q | HELD |
| TPG GP A, LLC | $6.1M | 378,551 | 0.12% | 2q | HELD |
| Nantahala Capital Management, LLC | $6.0M | 376,844 | 0.10% | 2q | +25.3%+$1.2M |
| Pivotal bioVenture Partners Investment Advisor LLC | $4.8M | 300,579 | 1.56% | 2q | HELD |
| RENAISSANCE TECHNOLOGIES LLC | $3.2M | 199,907 | 0.00% | 2q | +27.7%+$694.1K |
| VANGUARD CAPITAL MANAGEMENT LLC | $2.8M | 172,497 | 0.00% | 2q | +54.0%+$967.3K |
| Almitas Capital LLC | $1.9M | 120,682 | 0.46% | 2q | -36.9%-$1.1M |
| Rangeley Capital, LLC | $1.7M | 104,850 | 1.53% | 2q | +248.0%+$1.2M |
| Mariner, LLC | $809.1K | 50,566 | 0.00% | 2q | HELD |
| JANE STREET GROUP, LLC | $758.8K | 47,423 | 0.00% | new | NEW |
| GEODE CAPITAL MANAGEMENT, LLC | $512.9K | 32,047 | 0.00% | 2q | -9.5%-$54.1K |
| BlackRock, Inc. | $485.3K | 30,332 | 0.00% | 2q | +73.5%+$205.5K |
| XTX Topco Ltd | $344.0K | 21,497 | 0.00% | 2q | +91.5%+$164.3K |
| VANGUARD FIDUCIARY TRUST CO | $269.1K | 16,820 | 0.00% | 2q | +24.2%+$52.4K |
| TWO SIGMA INVESTMENTS, LP | $265.9K | 16,619 | 0.00% | new | NEW |
| STATE STREET CORP | $207.9K | 12,996 | 0.00% | new | NEW |
| Quadrature Capital Ltd | $207.9K | 12,995 | 0.00% | new | NEW |
| DIMENSIONAL FUND ADVISORS LP | $180.5K | 11,280 | 0.00% | 2q | HELD |
| Vanguard Global Advisers, LLC | $23.1K | 1,442 | 0.00% | 2q | HELD |
| MERCER GLOBAL ADVISORS INC /ADV | $20.0K | 1,250 | 0.00% | new | NEW |
| Hartford Financial Management Inc. | $13.0K | 812 | 0.00% | 2q | HELD |
| SBI Securities Co., Ltd. | $8.1K | 506 | 0.00% | 2q | -3.4% |
| Caitong International Asset Management Co., Ltd | $6.9K | 434 | 0.00% | new | NEW |
| UBS Group AG | $2.3K | 146 | 0.00% | 2q | -98.2%-$124.3K |
| Truvestments Capital LLC | $2.1K | 129 | 0.00% | new | NEW |
| MORGAN STANLEY | $2.0K | 125 | 0.00% | 2q | -0.8% |
| BNP PARIBAS FINANCIAL MARKETS | $1.9K | 120 | 0.00% | 2q | HELD |
| Fortitude Family Office, LLC | $848 | 53 | 0.00% | 2q | HELD |
| WELLS FARGO & COMPANY/MN | $592 | 37 | 0.00% | 2q | -50.0% |
| EverSource Wealth Advisors, LLC | $496 | 31 | 0.00% | new | NEW |
| HRT FINANCIAL LP | $410 | 25,657 | 0.00% | new | NEW |
| JPMORGAN CHASE & CO | $145 | 9 | 0.00% | 2q | -99.6%-$40.1K |
| Allworth Financial LP | $96 | 6 | 0.00% | 2q | HELD |
| BARCLAYS PLC | $48 | 3 | 0.00% | new | NEW |
| DANSKE BANK A/S | $16 | 1 | 0.00% | 2q | HELD |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G/A | Nantahala Capital Management, LLCwith 2 co-filers | 3.6% |
| 2026-08-14 | 13G/A | BALYASNY ASSET MANAGEMENT L.P.with 4 co-filers | 0.0% |
| 2026-08-14 | 13G/A | Cormorant Asset Management, LPwith 1 co-filers | 0.0% |
| 2026-08-06 | 13G/A | FMR LLCwith 1 co-filers | 15.0% |
| 2026-08-04 | 13G/A | Laurion Capital Management LPwith 2 co-filers | 0.0% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 37 | $79.2M | 11,862,795 | 9 | 9 | 7 | 0.0% |
| Q1 2026 | 37 | $41.8M | 4,656,011 | 34 | 0 | 0 | 0.0% |
| Q4 2025 | 42 | $20.6M | 24,779,866 | 4 | 7 | 8 | 0.0% |
| Q3 2025 | 42 | $14.8M | 29,671,597 | 6 | 8 | 10 | 0.0% |
| Q2 2025 | 45 | $10.5M | 31,016,122 | 5 | 7 | 12 | 0.0% |
| Q1 2025 | 46 | $20.9M | 31,911,015 | 2 | 7 | 12 | 0.0% |
| Q4 2024 | 48 | $31.0M | 32,338,106 | 4 | 11 | 9 | 0.0% |
| Q3 2024 | 48 | $36.4M | 31,123,387 | 1 | 10 | 21 | 0.0% |
| Q2 2024 | 62 | $42.3M | 31,540,965 | 18 | 11 | 16 | 0.0% |
| Q1 2024 | 54 | $55.2M | 29,825,220 | 9 | 14 | 13 | 0.0% |
| Q4 2023 | 50 | $76.1M | 31,849,499 | 8 | 20 | 6 | 0.0% |
| Q3 2023 | 54 | $105.1M | 31,189,415 | 4 | 12 | 13 | 0.0% |
| Q2 2023 | 53 | $188.1M | 33,234,140 | 9 | 22 | 10 | 0.0% |
| Q1 2023 | 43 | $201.3M | 35,245,654 | 1 | 14 | 11 | 0.0% |
| Q4 2022 | 45 | $209.4M | 31,866,504 | 7 | 21 | 9 | 0.0% |
| Q3 2022 | 52 | $402.1M | 27,791,403 | 10 | 12 | 15 | 0.0% |
| Q2 2022 | 45 | $208.8M | 27,659,986 | 4 | 14 | 16 | 0.0% |
| Q1 2022 | 47 | $193.9M | 27,776,263 | 10 | 15 | 8 | 0.0% |
| Q4 2021 | 38 | $260.1M | 27,428,818 | 4 | 15 | 4 | 0.0% |
| Q3 2021 | 34 | $419.9M | 24,054,395 | 34 | 0 | 0 | 0.0% |