Altimmune, Inc.: which funds bought and sold
Institutions that bought and sold Altimmune 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, 144 institutions that filed 13F reports for both quarters added to or opened positions in Altimmune, and 51 cut or closed them. Together they added a net 80.7M shares, +116.4% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 42.8M shares (+242.3%); index fund managers were net buyers of 20.4M shares (+55.5%). 57 opened a new position and 18 sold out entirely.
Bought, Q2 2026 144 institutions, 57 of them new holders Sold, Q2 2026 51 institutions, 18 of them sold out
Net change, all compared +80.7M shares (+116.4%)
Net change, active managers +42.8M shares (+242.3%), 33 bought, 13 sold
Buyers versus sellers
144 bought 32 51 sold
Active managers and hedge funds 33 bought · 13 sold · +42.8M
Index fund managers 11 bought · 1 sold · +20.4M
Other institutions 100 bought · 37 sold · +17.5M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Deep Track Capital, LP Hedge fund | +19.3M New position | 19.3M | $58.5M |
| Tcg Crossover Management, LLC | +10.0M New position | 10.0M | $30.4M |
| Blackrock, Inc. Index funds | +7.6M +59.3% | 20.4M | $62M |
| Viking Global Investors LP Hedge fund | +6.7M New position | 6.7M | $20.4M |
| RA Capital Management, L.P. Hedge fund | +6.5M New position | 6.5M | $19.8M |
| State Street Corp Index funds | +5.0M +69.3% | 12.1M | $36.8M |
| Woodline Partners LP Hedge fund | +3.4M New position | 3.4M | $10.3M |
| Nantahala Capital Management, LLC Hedge fund | +3.0M New position | 3.0M | $9.1M |
| Marshall Wace, LLP Hedge fund | +2.8M +70.3% | 6.8M | $20.8M |
| Trails Edge Capital Partners, LP | +2.7M New position | 2.7M | $8.1M |
| Vanguard Capital Management LLC Index funds | +2.5M +44.5% | 8.2M | $24.9M |
| Vanguard Portfolio Management LLC Index funds | +1.9M +36.2% | 7.3M | $22.3M |
| Geode Capital Management, LLC Index funds | +1.9M +61.3% | 5.0M | $15.2M |
| Great Point Partners LLC | +1.7M New position | 1.7M | $5.3M |
| Cormorant Asset Management, LP Hedge fund | +1.3M New position | 1.3M | $3.8M |
| AQR Capital Management LLC Hedge fund | +1.1M +1328.8% | 1.2M | $3.7M |
| Goldman Sachs Group Inc | +864K +64.0% | 2.2M | $6.7M |
| Ghisallo Capital Management LLC Hedge fund | +750K New position | 750K | $2.3M |
| Northern Trust Corp Index funds | +603K +60.4% | 1.6M | $4.9M |
| Citadel Advisors LLC Hedge fund | +535K +119.1% | 984K | $3M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Deep Track Capital, LP Hedge fund | +19.3M New position | 19.3M | $58.5M |
| Viking Global Investors LP Hedge fund | +6.7M New position | 6.7M | $20.4M |
| RA Capital Management, L.P. Hedge fund | +6.5M New position | 6.5M | $19.8M |
| Woodline Partners LP Hedge fund | +3.4M New position | 3.4M | $10.3M |
| Nantahala Capital Management, LLC Hedge fund | +3.0M New position | 3.0M | $9.1M |
| Marshall Wace, LLP Hedge fund | +2.8M +70.3% | 6.8M | $20.8M |
| Cormorant Asset Management, LP Hedge fund | +1.3M New position | 1.3M | $3.8M |
| AQR Capital Management LLC Hedge fund | +1.1M +1328.8% | 1.2M | $3.7M |
| Ghisallo Capital Management LLC Hedge fund | +750K New position | 750K | $2.3M |
| Citadel Advisors LLC Hedge fund | +535K +119.1% | 984K | $3M |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Alyeska Investment Group, L.P. Hedge fund | −2.6M Sold out | 0 | — |
| Schroder Investment Management Group Active manager | −668K Sold out | 0 | — |
| Susquehanna International Group, LLP | −595K −44.9% | 731K | $2.2M |
| D. E. Shaw & Co., Inc. Hedge fund | −525K −72.3% | 202K | $612,979 |
| Dimensional Fund Advisors LP | −406K −38.9% | 639K | $1.9M |
| Point72 Asset Management, L.P. Hedge fund | −178K −26.8% | 487K | $1.5M |
| Two Sigma Investments, LP Hedge fund | −98K −3.9% | 2.4M | $7.2M |
| HSBC Holdings PLC | −90K −58.2% | 64K | $199,504 |
| Engineers Gate Manager LP Hedge fund | −78K −67.2% | 38K | $115,632 |
| Virtu Financial LLC | −71K Sold out | 0 | — |
| BNP Paribas Financial Markets | −64K −14.7% | 371K | $1.1M |
| American Century Companies Inc Active manager | −63K Sold out | 0 | — |
| Exoduspoint Capital Management, LP Hedge fund | −49K Sold out | 0 | — |
| Grantham, Mayo, Van Otterloo & Co. LLC Active manager | −43K −33.7% | 84K | $254,864 |
| UBS Group AG | −38K −4.2% | 866K | $2.6M |
| Raymond James Financial Inc | −32K −60.2% | 21K | $65,007 |
| Caption Management, LLC | −28K −37.4% | 47K | $141,716 |
| Farallon Capital Management, L.L.C. Hedge fund | −28K Sold out | 0 | — |
| Simplex Trading, LLC | −23K Sold out | 0 | — |
| Scientech Research LLC | −22K Sold out | 0 | — |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Alyeska Investment Group, L.P. Hedge fund | −2.6M Sold out | 0 | — |
| Schroder Investment Management Group Active manager | −668K Sold out | 0 | — |
| D. E. Shaw & Co., Inc. Hedge fund | −525K −72.3% | 202K | $612,979 |
| Point72 Asset Management, L.P. Hedge fund | −178K −26.8% | 487K | $1.5M |
| Two Sigma Investments, LP Hedge fund | −98K −3.9% | 2.4M | $7.2M |
| Engineers Gate Manager LP Hedge fund | −78K −67.2% | 38K | $115,632 |
| American Century Companies Inc Active manager | −63K Sold out | 0 | — |
| Exoduspoint Capital Management, LP Hedge fund | −49K Sold out | 0 | — |
| Grantham, Mayo, Van Otterloo & Co. LLC Active manager | −43K −33.7% | 84K | $254,864 |
| Farallon Capital Management, L.L.C. Hedge fund | −28K Sold out | 0 | — |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Deep Track Capital, LPHedge fund | 19.3M | $58.5M |
| Tcg Crossover Management, LLC | 10.0M | $30.4M |
| Viking Global Investors LPHedge fund | 6.7M | $20.4M |
| RA Capital Management, L.P.Hedge fund | 6.5M | $19.8M |
| Woodline Partners LPHedge fund | 3.4M | $10.3M |
| Nantahala Capital Management, LLCHedge fund | 3.0M | $9.1M |
| Trails Edge Capital Partners, LP | 2.7M | $8.1M |
| Great Point Partners LLC | 1.7M | $5.3M |
| Cormorant Asset Management, LPHedge fund | 1.3M | $3.8M |
| Ghisallo Capital Management LLCHedge fund | 750K | $2.3M |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Alyeska Investment Group, L.P.Hedge fund | 2.6M | $8.1M |
| Schroder Investment Management GroupActive manager | 668K | $1.9M |
| Virtu Financial LLC | 71K | $217,000 |
| American Century Companies IncActive manager | 63K | $193,760 |
| Exoduspoint Capital Management, LPHedge fund | 49K | $149,747 |
| Farallon Capital Management, L.L.C.Hedge fund | 28K | $85,008 |
| Simplex Trading, LLC | 23K | $70,350 |
| Scientech Research LLC | 22K | $67,267 |
| Keudell/Morrison Wealth Management | 19K | $56,980 |
| Nine Masts Capital Ltd | 12K | $36,498 |
Who holds the shares
- Institutions reporting
- 210
- Ten largest holders
- 67.5% of 13F-reported shares
- Index fund managers
- 37.7% of 13F-reported shares
- Active managers and hedge funds
- 39.9% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 33 | 13 | 19 | 6 | +42.8M | +242.3% |
| Index fund managers | 11 | 1 | 0 | 0 | +20.4M | +55.5% |
| Other institutions | 100 | 37 | 38 | 12 | +17.5M | +117.0% |