Altimmune
ALT · NASDAQ
$2.30+$0.07 (+3.14%)TodayMarket closed ·
Prev close $2.23
Who owns ALT
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 50.6% of ALT’s shares.
- Deep Track Capital LP9.9%
- BlackRock Institutional Trust Company, N.A.8.5%
- State Street Investment Management (US)6.2%
- TCG Crossover Management, LLC5.1%
- Next 6 largest institutions20.9%
- All other shareholders49.4%
| Holder | Shares | % of shares |
|---|---|---|
| Deep Track Capital LP | 19.25M | 9.90% |
| BlackRock Institutional Trust Company, N.A. | 16.57M | 8.52% |
| State Street Investment Management (US) | 12.10M | 6.22% |
| TCG Crossover Management, LLC | 10.00M | 5.14% |
| Vanguard Capital Management, LLC | 8.18M | 4.21% |
| Vanguard Portfolio Management, LLC | 7.33M | 3.77% |
| Marshall Wace LLP | 6.84M | 3.52% |
| Viking Global Investors LP | 6.70M | 3.45% |
| RA Capital Management, LP | 6.50M | 3.34% |
| Geode Capital Management, L.L.C. | 5.01M | 2.58% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| State Street SPDR S&P Biotech ETF | 8.54M | 4.39% |
| Vanguard Total Stock Market Index Fund | 5.75M | 2.96% |
| iShares Russell 2000 ETF | 5.14M | 2.64% |
| Vanguard Strategic Equity Fund | 2.67M | 1.37% |
| Vanguard Extended Market Index Fund | 2.24M | 1.15% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders bought $44.25K (1 trade) of ALT on the open market, with no sales.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Arbet-Engels Christophe | Option exercise | 37.50K | — |
| Arbet-Engels Christophe | Tax withholding | 12.68K | $34.99K |
| Arbet-Engels Christophe | Option exercise | 37.50K | — |
| WEAVER GREGORY L | Option exercise | 14.47K | — |
| WEAVER GREGORY L | Tax withholding | 4.38K | $12.09K |
| WEAVER GREGORY L | Option exercise | 14.47K | — |
| MENZIUSO RICHARD THOMAS | Award | 36.23K | — |
| MENZIUSO RICHARD THOMAS | Award | 84.55K | — |
| Richardson Linda M | Option exercise | 24.00K | — |
| Richardson Linda M | Tax withholding | 6.83K | $22.12K |
Short interest
Settled Sep 30, 2026
- Shares short
- 46.08M
- Days to cover
- 10.54
- % of shares outstanding
- 23.70%
- Average daily volume
- 4.37M
- Change since last report
- −11.0%
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