Altimmune, Inc.
ALT- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001326190
In the last 90 days, Altimmune, Inc. insiders filed 1 open-market purchase and 0 sales; 210 institutions reported holding it in 13F filings for Q2 2026, worth $460.7M in total; Viking Global Investors is the only superinvestor holding it.
Key figures
- Insider buysLast 90 days, $44.3K in total
- 1
- Insider sellsOpen market, last 90 days
- 0
- 13F holdersQ2 2026, +40 vs. previous quarter
- 210
- 13F valueReported value at the end of Q2 2026
- $460.7M
- Superinvestors holdingAt the end of Q2 2026
- 1
Price chart
Superinvestors holding ALT, Q2 2026
1 superinvestor reports holding Altimmune, Inc. on Form 13F. Percentages are the stock's share of each portfolio.
Viking Global Investors
Andreas Halvorsen
0.1%
Altimmune, Inc.'s share of the portfolio
- Shares
- 6,700,000
- Value
- $20.4M
Latest insider trades
Open-market purchases and sales by Altimmune, Inc. insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 13, 2026 (view filing)4:05 PM ET | Aug 13 | Same day | Durso Jerome BenedictPresident and CEO | PPurchaseCommon Stock, par value $0.0001 | +15.0K | $2.95 | +$44.3K | +31.6%62.5K after | |
| Apr 6, 2026 (view filing) | Apr 6 | Same day | Gill JohnDirector | PPurchaseCommon Stock, par value $0.0001 | +9.20K | $3.41 | +$31.4K | +73.6%21.7K after | |
| Apr 1, 2026 (view filing) | Apr 1 | Same day | Durso Jerome BenedictPresident and CEO | PPurchaseCommon Stock, par value $0.0001 | +15.0K | $3.14 | +$47.1K | +46.2%47.5K after | |
| Apr 1, 2026 (view filing) | Apr 1 | Same day | Weaver Gregory LChief Financial Officer | PPurchaseCommon Stock, par value $0.0001 | +10.0K | $3.15 | +$31.5K | +35.6%38.1K after | |
| Mar 9, 2026 (view filing) | Mar 6 | 3 days | Durso Jerome BenedictPresident and CEO | PPurchaseCommon Stock, par value $0.0001 | +20.0K | $3.54 | +$70.8K | +160.0%32.5K after | |
| Mar 9, 2026 (view filing) | Mar 6 | 3 days | Weaver Gregory LChief Financial Officer | PPurchaseCommon Stock, par value $0.0001 | +5.00K | $3.54 | +$17.7K | +21.7%28.1K after | |
| Jan 9, 2026 (view filing) | Jan 8 | 1 day | Pisano WayneDirector | PPurchaseCommon Stock, par value $0.0001 | +5.00K | $4.08 | +$20.4K | +58.8%13.5K after | |
| Jan 5, 2026 (view filing) | Jan 5 | Same day | Sohn Catherine A.Director | PPurchaseCommon Stock, par value $0.0001 | +500 | $4.24 | +$2.12K | +50.0%1.50K after | |
| Dec 29, 2025 (view filing) | Dec 29 | Same day | Jorkasky DianeDirector | PPurchaseCommon Stock, par value $0.0001 | +527 | $3.80 | +$2.00K | New position527 after | |
| Dec 23, 2025 (view filing) | Dec 23 | Same day | Gill JohnDirector | PPurchaseCommon Stock, par value $0.0001 | +12.5K | $4.10 | +$51.3K | New position12.5K after |
Top 10 13F holders, Q2 2026
The largest institutional positions in Altimmune, Inc. at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 20,385,284 | $62.0M | 0.00% | +7,590,007+59.3% | Added |
| Deep Track Capital, LP | 19,250,000 | $58.5M | 0.86% | +19,250,000 | New |
| State Street Corp | 12,098,540 | $36.8M | 0.00% | +4,952,990+69.3% | Added |
| TCG Crossover Management, LLC | 10,000,000 | $30.4M | 0.73% | +10,000,000 | New |
| Vanguard Capital Management LLC | 8,177,752 | $24.9M | 0.00% | +2,519,703+44.5% | Added |
| Vanguard Portfolio Management LLC | 7,330,265 | $22.3M | 0.00% | +1,948,263+36.2% | Added |
| Marshall Wace, LLP | 6,841,055 | $20.8M | 0.02% | +2,823,154+70.3% | Added |
| Viking Global Investors LPSuperinvestorViking Global Investors | 6,700,000 | $20.4M | 0.06% | +6,700,000 | New |
| Ra Capital Management, L.P. | 6,500,000 | $19.8M | 0.17% | +6,500,000 | New |
| Geode Capital Management, LLC | 5,011,314 | $15.2M | 0.00% | +1,904,218+61.3% | Added |