Rallybio Corp (RLYB) — Institutional Holders, Q2 2026
37 institutional investment managers reported a RLYB position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $65.0M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
RLYB in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- ADAR1 Capital ManagementAdded · +905,817 sh+$14.5M
- Rangeley CapitalAdded · +74,720 sh+$1.2M
- VANGUARD CAPITAL MANAGEMENTAdded · +60,457 sh+$967.3K
- CITADEL ADVISORSAdded · +52,314 sh+$837.0K
- JANE STREET GROUPNew · +47,423 sh+$758.8K
Biggest sellers
- Cormorant Asset ManagementSold out · -400,000 sh-$6.4M
- BALYASNY ASSET MANAGEMENT L.P.Sold out · -376,573 sh-$6.0M
- Laurion Capital ManagementSold out · -302,756 sh-$4.8M
- 5AM Venture ManagementSold out · -291,788 sh-$4.7M
- JOHNSON & JOHNSONSold out · -152,901 sh-$2.4M
RLYB 13F holders ranked 1–37 of 37
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | ADAR1 Capital Management#1 · 926,352 sh | 926,352 | $14.8M | 0.68% | +4411.1% |
| 2 | FMR#2 · 794,720 sh | 794,720 | $12.7M | <0.01% | +0.2% |
| 3 | VIKING GLOBAL INVESTORS#3 · 524,347 sh | 524,347 | $8.4M | 0.02% | 0.0% |
| 4 | TPG GP A#4 · 378,551 sh | 378,551 | $6.1M | 0.12% | 0.0% |
| 5 | Pivotal bioVenture Partners Investment Advisor#5 · 300,579 sh | 300,579 | $4.8M | 1.56% | 0.0% |
| 6 | RENAISSANCE TECHNOLOGIES#6 · 199,907 sh | 199,907 | $3.2M | <0.01% | +27.7% |
| 7 | Nantahala Capital Management#7 · 188,422 sh | 188,422 | $3.0M | 0.10% | -37.3% |
| 8 | VANGUARD CAPITAL MANAGEMENT#8 · 172,497 sh | 172,497 | $2.8M | <0.01% | +54.0% |
| 9 | Almitas Capital#9 · 120,682 sh | 120,682 | $1.9M | 0.46% | -36.9% |
| 10 | Rangeley Capital#10 · 104,850 sh | 104,850 | $1.7M | 1.53% | +248.0% |
| 11 | CITADEL ADVISORS#11 · 72,200 sh | 72,200 | $1.2M | <0.01% | +263.1% |
| 12 | Mariner#12 · 50,566 sh | 50,566 | $809.1K | <0.01% | 0.0% |
| 13 | JANE STREET GROUP#13 · 47,423 sh | 47,423 | $758.8K | <0.01% | New |
| 14 | GEODE CAPITAL MANAGEMENT#14 · 32,047 sh | 32,047 | $512.9K | 0.00% | -9.5% |
| 15 | BlackRock#15 · 30,332 sh | 30,332 | $485.3K | 0.00% | +73.5% |
| 16 | HRT FINANCIAL#16 · 25,657 sh | 25,657 | $410.0K | <0.01% | New |
| 17 | XTX Topco Ltd#17 · 21,497 sh | 21,497 | $344.0K | <0.01% | +91.5% |
| 18 | VANGUARD FIDUCIARY#18 · 16,820 sh | 16,820 | $269.1K | <0.01% | +24.2% |
| 19 | TWO SIGMA INVESTMENTS#19 · 16,619 sh | 16,619 | $265.9K | <0.01% | New |
| 20 | STATE STREET#20 · 12,996 sh | 12,996 | $207.9K | 0.00% | New |
| 21 | Quadrature Capital Ltd#21 · 12,995 sh | 12,995 | $207.9K | <0.01% | New |
| 22 | DIMENSIONAL FUND ADVISORS#22 · 11,280 sh | 11,280 | $180.5K | 0.00% | 0.0% |
| 23 | Vanguard Global Advisers#23 · 1,442 sh | 1,442 | $23.1K | 0.00% | 0.0% |
| 24 | Hartford Financial Management#24 · 812 sh | 812 | $13.0K | — | 0.0% |
| 25 | SBI Securities , Ltd.#25 · 506 sh | 506 | $8.1K | — | -3.4% |
| 26 | Caitong International Asset Management , Ltd#26 · 434 sh | 434 | $6.9K | <0.01% | New |
| 27 | UBS Group AG#27 · 146 sh | 146 | $2.3K | 0.00% | -98.2% |
| 28 | Truvestments Capital#28 · 129 sh | 129 | $2.1K | <0.01% | New |
| 29 | MORGAN STANLEY#29 · 125 sh | 125 | $2.0K | 0.00% | -0.8% |
| 30 | BNP PARIBAS FINANCIAL MARKETS#30 · 120 sh | 120 | $1.9K | 0.00% | 0.0% |
| 31 | Fortitude Family Office#31 · 53 sh | 53 | $848.00 | — | 0.0% |
| 32 | WELLS FARGO & COMPANY#32 · 37 sh | 37 | $592.00 | 0.00% | 0.0% |
| 33 | EverSource Wealth Advisors#33 · 31 sh | 31 | $496.00 | 0.00% | New |
| 34 | JPMORGAN CHASE#34 · 9 sh | 9 | $145.00 | 0.00% | -99.6% |
| 35 | Allworth Financial#35 · 6 sh | 6 | $96.00 | 0.00% | 0.0% |
| 36 | BARCLAYS PLC#36 · 3 sh | 3 | $48.00 | 0.00% | New |
| 37 | DANSKE BANK A/S#37 · 1 sh | 1 | $16.00 | 0.00% | 0.0% |
Funds that sold out of RLYB in Q2 2026 (9)
Held RLYB at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Cormorant Asset Management400,000 sh | 400,000 | $3.6M |
| BALYASNY ASSET MANAGEMENT L.P.376,573 sh | 376,573 | $3.4M |
| Laurion Capital Management302,756 sh | 302,756 | $2.7M |
| 5AM Venture Management291,788 sh | 291,788 | $2.6M |
| JOHNSON & JOHNSON152,901 sh | 152,901 | $1.4M |
| DELTEC ASSET MANAGEMENT33,750 sh | 33,750 | $302.7K |
| GTS SECURITIES22,016 sh | 22,016 | $197.5K |
| ACADIAN ASSET MANAGEMENT10,433 sh | 10,433 | $92.0K |
| Tower Research Capital (TRC)907 sh | 907 | $8.1K |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.