Rallybio Corp: which funds bought and sold
Institutions that bought and sold Rallybio shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 18 institutions that filed 13F reports for both quarters added to or opened positions in Rallybio, and 16 cut or closed them. Together they sold a net 465K shares, −10.0% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 33K shares (−1.2%); index fund managers were net buyers of 86K shares (+48.3%). 9 opened a new position and 10 sold out entirely.
Bought, Q2 2026 18 institutions, 9 of them new holders Sold, Q2 2026 16 institutions, 10 of them sold out
Net change, all compared −465K shares (−10.0%)
Net change, active managers −33K shares (−1.2%), 6 bought, 4 sold
Buyers versus sellers
18 bought 12 16 sold
Active managers and hedge funds 6 bought · 4 sold · −33K
Index fund managers 4 bought · 1 sold · +86K
Other institutions 8 bought · 11 sold · −518K
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| ADAR1 Capital Management, LLC Hedge fund | +906K +4411.1% | 926K | $14.8M |
| Nantahala Capital Management, LLC Hedge fund | +76K +25.3% | 377K | $6M |
| Rangeley Capital, LLC | +75K +248.0% | 105K | $1.7M |
| Vanguard Capital Management LLC Index funds | +60K +54.0% | 172K | $2.8M |
| Jane Street Group, LLC | +47K New position | 47K | $758,768 |
| Renaissance Technologies LLC Hedge fund | +43K +27.7% | 200K | $3.2M |
| HRT Financial LP | +26K New position | 26K | $410,000 |
| Two Sigma Investments, LP Hedge fund | +17K New position | 17K | $265,904 |
| State Street Corp Index funds | +13K New position | 13K | $207,936 |
| Quadrature Capital Ltd Hedge fund | +13K New position | 13K | $207,920 |
| Blackrock, Inc. Index funds | +13K +73.5% | 30K | $485,312 |
| Xtx Topco Ltd | +10K +91.5% | 21K | $343,952 |
| Vanguard Fiduciary Trust Co Index funds | +3,273 +24.2% | 17K | $269,120 |
| FMR LLC Active manager | +1,269 +0.2% | 795K | $12.7M |
| Caitong International Asset Management Co., Ltd | +434 New position | 434 | $6,944 |
| Truvestments Capital LLC | +129 New position | 129 | $2,064 |
| Eversource Wealth Advisors, LLC | +31 New position | 31 | $496 |
| Barclays PLC | +3 New position | 3 | $48 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| ADAR1 Capital Management, LLC Hedge fund | +906K +4411.1% | 926K | $14.8M |
| Nantahala Capital Management, LLC Hedge fund | +76K +25.3% | 377K | $6M |
| Renaissance Technologies LLC Hedge fund | +43K +27.7% | 200K | $3.2M |
| Two Sigma Investments, LP Hedge fund | +17K New position | 17K | $265,904 |
| Quadrature Capital Ltd Hedge fund | +13K New position | 13K | $207,920 |
| FMR LLC Active manager | +1,269 +0.2% | 795K | $12.7M |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Cormorant Asset Management, LP Hedge fund | −400K Sold out | 0 | — |
| Balyasny Asset Management L.P. Hedge fund | −377K Sold out | 0 | — |
| Laurion Capital Management LP Hedge fund | −303K Sold out | 0 | — |
| 5Am Venture Management, LLC | −292K Sold out | 0 | — |
| Johnson & Johnson | −153K Sold out | 0 | — |
| Aju Ib Investment Co., Ltd. | −94K Sold out | 0 | — |
| Almitas Capital LLC | −71K −36.9% | 121K | $1.9M |
| Deltec Asset Management LLC | −34K Sold out | 0 | — |
| Gts Securities LLC | −22K Sold out | 0 | — |
| Acadian Asset Management LLC Active manager | −10K Sold out | 0 | — |
| UBS Group AG | −7,768 −98.2% | 146 | $2,336 |
| Geode Capital Management, LLC Index funds | −3,378 −9.5% | 32K | $512,865 |
| Jpmorgan Chase & Co | −2,488 −99.6% | 9 | $145 |
| Tower Research Capital LLC (TRC) | −907 Sold out | 0 | — |
| Sbi Securities Co., Ltd. | −18 −3.4% | 506 | $8,096 |
| Morgan Stanley | −1 −0.8% | 125 | $2,000 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Cormorant Asset Management, LP Hedge fund | −400K Sold out | 0 | — |
| Balyasny Asset Management L.P. Hedge fund | −377K Sold out | 0 | — |
| Laurion Capital Management LP Hedge fund | −303K Sold out | 0 | — |
| Acadian Asset Management LLC Active manager | −10K Sold out | 0 | — |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Jane Street Group, LLC | 47K | $758,768 |
| HRT Financial LP | 26K | $410,000 |
| Two Sigma Investments, LPHedge fund | 17K | $265,904 |
| State Street CorpIndex funds | 13K | $207,936 |
| Quadrature Capital LtdHedge fund | 13K | $207,920 |
| Caitong International Asset Management Co., Ltd | 434 | $6,944 |
| Truvestments Capital LLC | 129 | $2,064 |
| Eversource Wealth Advisors, LLC | 31 | $496 |
| Barclays PLC | 3 | $48 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Cormorant Asset Management, LPHedge fund | 400K | $3.6M |
| Balyasny Asset Management L.P.Hedge fund | 377K | $3.4M |
| Laurion Capital Management LPHedge fund | 303K | $2.7M |
| 5Am Venture Management, LLC | 292K | $2.6M |
| Johnson & Johnson | 153K | $1.4M |
| Aju Ib Investment Co., Ltd. | 94K | $846,176 |
| Deltec Asset Management LLC | 34K | $302,737 |
| Gts Securities LLC | 22K | $197,484 |
| Acadian Asset Management LLCActive manager | 10K | $92,000 |
| Tower Research Capital LLC (TRC) | 907 | $8,136 |
Who holds the shares
- Institutions reporting
- 37
- Ten largest holders
- 91.7% of 13F-reported shares
- Index fund managers
- 6.2% of 13F-reported shares
- Active managers and hedge funds
- 68.7% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 6 | 4 | 2 | 4 | −33K | −1.2% |
| Index fund managers | 4 | 1 | 1 | 0 | +86K | +48.3% |
| Other institutions | 8 | 11 | 6 | 6 | −518K | −32.7% |