Altimmune
Developing pemvidutide across MASH, AUD, and alcohol-associated liver disease.
$3.12
After-hours close−0.00 (−0.12%)
At close$3.13(−3.55%)
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Breakdown13F · Form 4
Institutions 77.48%150.68M sharesInsiders 0.39%764.0K sharesOther 22.13%43.03M shares
Shares outstanding 194.47M · Float 183.67M · 94.4% free float
Institutions13F, as of Jun 30, 2026
221 holders · 150.68M shares · 59 new positions · 147 increased · 33 reduced · 21 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 20.39M | 10.48% | +7.59M | Aug 7, 2026 |
| Deep Track Capital, LP | 19.25M | 9.90% | +19.25Mnew | Aug 14, 2026 |
| State Street Corp | 12.10M | 6.22% | +4.95M | Aug 7, 2026 |
| TCG Crossover Management, LLC | 10.00M | 5.14% | +10.00Mnew | Aug 14, 2026 |
| Vanguard Capital Management LLC | 8.18M | 4.21% | +2.52M | Aug 13, 2026 |
| Vanguard Portfolio Management LLC | 7.33M | 3.77% | +1.95M | Aug 13, 2026 |
| Marshall Wace, LLP | 6.84M | 3.52% | +2.82M | Aug 13, 2026 |
| Viking Global Investors LP | 6.70M | 3.45% | +6.70Mnew | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Deep Track Capital, LP | 9.99% | 19.42M | 13G | Apr 30, 2026 ↗ |
| BlackRock, Inc. | 7.60% | 6.13M | 13G | Jul 16, 2025 ↗ |
| Viking Global Investors LP | 6.70% | 13.40M | 13G | May 1, 2026 ↗ |
| RA Capital Management, L.P. | 6.50% | 13.00M | 13G | May 1, 2026 ↗ |
| State Street Corporation | 5.50% | 7.15M | 13G | May 12, 2026 ↗ |
| TCG Crossover GP II, LLC | 5.00% | 10.00M | 13G | May 1, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Vipin K. Garg | director | 424.5K | 0.22% | Feb 2, 2026 |
| M. Scot Roberts | officer: Chief Scientific Officer | 113.7K | 0.06% | Aug 3, 2026 |
| Raymond M. Jordt | officer: Chief Business Officer | 70.1K | 0.04% | Feb 2, 2026 |
| Jerome Benedict Durso | director, officer: President and CEO | 62.5K | 0.03% | Aug 13, 2026 |
| Gregory L. Weaver | officer: Chief Financial Officer | 39.8K | 0.02% | Aug 3, 2026 |
| John Gill | director | 21.7K | 0.01% | Apr 6, 2026 |
| Matthew Scott Harris | officer: Chief Medical Officer | 16.1K | 0.01% | Aug 4, 2025 |
| Wayne Pisano | director | 13.5K | 0.01% | Jan 9, 2026 |
| Catherine A. Sohn | director | 1.5K | 0.00% | Jan 5, 2026 |
| Diane Jorkasky | director | 527 | 0.00% | Dec 29, 2025 |
10 ten-percent owners hold 21.62M shares by Form 4, outside the officers-and-directors figure above · 30 people have not refiled in the last 18 months (3.09M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 13, 2026 | Jerome Benedict Dursodirector, officer: President and CEO | Purchase | 15,000 | $2.95 | 62,500 |
| Apr 6, 2026 | John Gilldirector | Purchase | 9,200 | $3.41 | 21,700 |
| Apr 1, 2026 | Jerome Benedict Dursodirector, officer: President and CEO | Purchase | 15,000 | $3.14 | 47,500 |
| Apr 1, 2026 | Gregory L. Weaverofficer: Chief Financial Officer | Purchase | 10,000 | $3.15 | 38,078 |
| Mar 6, 2026 | Jerome Benedict Dursodirector, officer: President and CEO | Purchase | 20,000 | $3.54 | 32,500 |
| Mar 6, 2026 | Gregory L. Weaverofficer: Chief Financial Officer | Purchase | 5,000 | $3.54 | 28,078 |
| Jan 8, 2026 | Wayne Pisanodirector | Purchase | 5,000 | $4.08 | 13,498 |
| Jan 5, 2026 | Catherine A. Sohndirector | Purchase | 500 | $4.24 | 1,500 |
| Dec 29, 2025 | Diane Jorkaskydirector | Purchase | 527 | $3.80 | 527 |
| Dec 23, 2025 | John Gilldirector | Purchase | 12,500 | $4.10 | 12,500 |
CongressHouse and Senate disclosures
Not reported.