Altimmune, Inc. (ALT) · Insider trading
What Altimmune's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$370,120
6 insiders, 11 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
+$370,120
bought less sold
Latest filing
2026-10-05
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Durso Jerome BenedictDirector, President and CEO | $213,775 | – | 4 | 2026-08-13 | 62,500 |
| Weaver Gregory LChief Financial Officer | $101,200 | – | 3 | 2026-04-01 | 38,078 |
| Gill JohnDirector | $82,622 | – | 2 | 2026-04-06 | 21,700 |
| Pisano WayneDirector | $20,400 | – | 1 | 2026-01-08 | 13,498 |
| Sohn Catherine A.Director | $7,900 | – | 2 | 2026-01-05 | 1,500 |
| Jorkasky DianeDirector | $2,003 | – | 1 | 2025-12-29 | 527 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-13 | Durso Jerome BenedictDirector, President and CEO | Buy | 15,000 | 2.95 | $44,250 | 62,500 | Form 4 |
| 2026-04-06 | Gill JohnDirector | Buy | 9,200 | 3.41 | $31,372 | 21,700 | Form 4 |
| 2026-04-01 | Weaver Gregory LChief Financial Officer | Buy | 10,000 | 3.15 | $31,500 | 38,078 | Form 4 |
| 2026-04-01 | Durso Jerome BenedictDirector, President and CEO | Buy | 15,000 | 3.14 | $47,100 | 47,500 | Form 4 |
| 2026-03-06 | Weaver Gregory LChief Financial Officer | Buy | 5,000 | 3.54 | $17,700 | 28,078 | Form 4 |
| 2026-03-06 | Durso Jerome BenedictDirector, President and CEO | Buy | 20,000 | 3.54 | $70,800 | 32,500 | Form 4 |
| 2026-01-08 | Pisano WayneDirector | Buy | 5,000 | 4.08 | $20,400 | 13,498 | Form 4 |
| 2026-01-05 | Sohn Catherine A.Director | Buy | 500 | 4.24 | $2,120 | 1,500 | Form 4 |
| 2025-12-29 | Jorkasky DianeDirector | Buy | 527 | 3.80 | $2,003 | 527 | Form 4 |
| 2025-12-23 | Gill JohnDirector | Buy | 12,500 | 4.10 | $51,250 | 12,500 | Form 4 |
| 2025-12-22 | Durso Jerome BenedictDirector | Buy | 12,500 | 4.13 | $51,625 | 12,500 | Form 4 |
| 2025-03-17 | Sohn Catherine A.Director | Buy | 1,000 | 5.78 | $5,780 | 1,000 | Form 4 |
| 2025-03-13 | Weaver Gregory LChief Financial Officer | Buy | 10,000 | 5.20 | $52,000 | 10,000 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
28 × option exercise28 × shares withheld for tax12 × grant or award1 × gift
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-10-01 | Weaver Gregory LChief Financial Officer | Option exercise M | +14,475 | – | 54,306 | Form 4 |
| 2026-10-01 | Weaver Gregory LChief Financial Officer | Shares withheld for tax F | −4,379 | 2.76 | 49,927 | Form 4 |
| 2026-10-01 | Arbet-Engels ChristopheChief Medical Officer | Option exercise M | +37,500 | – | 37,500 | Form 4 |
| 2026-10-01 | Arbet-Engels ChristopheChief Medical Officer | Shares withheld for tax F | −12,679 | 2.76 | 24,821 | Form 4 |
| 2026-09-16 | Richardson Linda MChief Commercial Officer | Option exercise M | +24,000 | – | 24,000 | Form 4 |
| 2026-09-16 | Richardson Linda MChief Commercial Officer | Shares withheld for tax F | −6,826 | 3.24 | 17,174 | Form 4 |
| 2026-07-31 | Weaver Gregory LChief Financial Officer | Grant or award A | +1,753 | 2.41 | 39,831 | Form 4 |
| 2026-07-31 | Roberts M ScotChief Scientific Officer | Grant or award A | +875 | 2.41 | 113,699 | Form 4 |
| 2026-02-02 | Roberts M ScotChief Scientific Officer | Option exercise M | +7,775 | – | 115,153 | Form 4 |
| 2026-02-02 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −2,329 | 5.55 | 112,824 | Form 4 |
| 2026-01-31 | Roberts M ScotChief Scientific Officer | Grant or award A | +5,567 | 3.07 | 107,378 | Form 4 |
| 2026-01-31 | Garg Vipin KDirector | Grant or award A | +6,926 | 3.07 | 424,519 | Form 4 |
| 2026-01-31 | Jordt Raymond MChief Business Officer | Grant or award A | +4,571 | 3.07 | 70,107 | Form 4 |
| 2026-01-30 | Roberts M ScotChief Scientific Officer | Option exercise M | +9,275 | – | 104,670 | Form 4 |
| 2026-01-30 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −2,859 | 5.60 | 101,811 | Form 4 |
| 2026-01-30 | Garg Vipin KDirector | Option exercise M | +26,775 | – | 429,225 | Form 4 |
| 2026-01-30 | Garg Vipin KDirector | Shares withheld for tax F | −11,632 | 5.60 | 417,593 | Form 4 |
| 2026-01-27 | Garg Vipin KDirector | Option exercise M | +41,200 | – | 420,348 | Form 4 |
| 2026-01-27 | Garg Vipin KDirector | Shares withheld for tax F | −17,898 | 6.18 | 402,450 | Form 4 |
| 2026-01-27 | Roberts M ScotChief Scientific Officer | Option exercise M | +15,850 | – | 100,143 | Form 4 |
| 2026-01-27 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −4,748 | 6.18 | 95,395 | Form 4 |
| 2026-01-27 | Jordt Raymond MChief Business Officer | Option exercise M | +15,850 | – | 69,765 | Form 4 |
| 2026-01-27 | Jordt Raymond MChief Business Officer | Shares withheld for tax F | −4,229 | 6.18 | 65,536 | Form 4 |
| 2026-01-25 | Garg Vipin KDirector | Option exercise M | +42,050 | – | 397,132 | Form 4 |
| 2026-01-25 | Garg Vipin KDirector | Shares withheld for tax F | −17,984 | 5.50 | 379,148 | Form 4 |
| 2026-01-25 | Roberts M ScotChief Scientific Officer | Option exercise M | +14,600 | – | 88,666 | Form 4 |
| 2026-01-25 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −4,373 | 5.50 | 84,293 | Form 4 |
| 2026-01-25 | Jordt Raymond MChief Business Officer | Option exercise M | +14,600 | – | 57,770 | Form 4 |
| 2026-01-25 | Jordt Raymond MChief Business Officer | Shares withheld for tax F | −3,855 | 5.50 | 53,915 | Form 4 |
| 2026-01-01 | Jordt Raymond MChief Business Officer | Option exercise M | +9,375 | – | 45,645 | Form 4 |
| 2026-01-01 | Jordt Raymond MChief Business Officer | Shares withheld for tax F | −2,475 | 3.61 | 43,170 | Form 4 |
| 2025-11-11 | Weaver Gregory LChief Financial Officer | Option exercise M | +18,750 | – | 28,750 | Form 4 |
| 2025-11-11 | Weaver Gregory LChief Financial Officer | Shares withheld for tax F | −5,672 | 4.28 | 23,078 | Form 4 |
| 2025-07-31 | Roberts M ScotChief Scientific Officer | Grant or award A | +846 | 3.14 | 74,066 | Form 4 |
| 2025-07-31 | Harris Matthew ScottChief Medical Officer | Grant or award A | +2,018 | 3.14 | 16,087 | Form 4 |
| 2025-07-31 | Jordt Raymond MChief Business Officer | Grant or award A | +1,368 | 3.14 | 36,270 | Form 4 |
| 2025-03-07 | Harris Matthew ScottChief Medical Officer | Gift G | −67,787 | – | 14,069 | Form 4 |
| 2025-02-02 | Roberts M ScotChief Scientific Officer | Option exercise M | +7,775 | – | 75,536 | Form 4 |
| 2025-02-02 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −2,316 | 6.64 | 73,220 | Form 4 |
| 2025-02-02 | Harris Matthew ScottChief Medical Officer | Option exercise M | +7,775 | – | 84,564 | Form 4 |
| 2025-02-02 | Harris Matthew ScottChief Medical Officer | Shares withheld for tax F | −2,708 | 6.64 | 81,856 | Form 4 |
| 2025-02-02 | Garg Vipin KDirector, President and CEO | Option exercise M | +18,950 | – | 363,364 | Form 4 |
| 2025-02-02 | Garg Vipin KDirector, President and CEO | Shares withheld for tax F | −8,282 | 6.64 | 355,082 | Form 4 |
| 2025-02-01 | Roberts M ScotChief Scientific Officer | Option exercise M | +6,166 | – | 69,562 | Form 4 |
| 2025-02-01 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −1,801 | 6.64 | 67,761 | Form 4 |
| 2025-02-01 | Harris Matthew ScottChief Medical Officer | Option exercise M | +6,166 | – | 78,898 | Form 4 |
| 2025-02-01 | Harris Matthew ScottChief Medical Officer | Shares withheld for tax F | −2,109 | 6.64 | 76,789 | Form 4 |
| 2025-02-01 | Garg Vipin KDirector, President and CEO | Option exercise M | +16,545 | – | 351,645 | Form 4 |
| 2025-02-01 | Garg Vipin KDirector, President and CEO | Shares withheld for tax F | −7,231 | 6.64 | 344,414 | Form 4 |
| 2025-01-31 | Roberts M ScotChief Scientific Officer | Grant or award A | +3,184 | 5.18 | 63,396 | Form 4 |
| 2025-01-31 | Jordt Raymond MChief Business Officer | Grant or award A | +2,614 | 5.18 | 34,902 | Form 4 |
| 2025-01-31 | Harris Matthew ScottChief Medical Officer | Grant or award A | +1,905 | 5.18 | 72,732 | Form 4 |
| 2025-01-31 | Garg Vipin KDirector, President and CEO | Grant or award A | +4,105 | 5.18 | 335,100 | Form 4 |
| 2025-01-30 | Roberts M ScotChief Scientific Officer | Option exercise M | +9,275 | – | 62,921 | Form 4 |
| 2025-01-30 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −2,709 | 7.00 | 60,212 | Form 4 |
| 2025-01-30 | Harris Matthew ScottChief Medical Officer | Option exercise M | +9,275 | – | 74,000 | Form 4 |
| 2025-01-30 | Harris Matthew ScottChief Medical Officer | Shares withheld for tax F | −3,173 | 7.00 | 70,827 | Form 4 |
| 2025-01-30 | Garg Vipin KDirector, President and CEO | Option exercise M | +26,775 | – | 342,696 | Form 4 |
| 2025-01-30 | Garg Vipin KDirector, President and CEO | Shares withheld for tax F | −11,701 | 7.00 | 330,995 | Form 4 |
| 2025-01-25 | Garg Vipin KDirector, President and CEO | Option exercise M | +42,050 | – | 334,078 | Form 4 |
| 2025-01-25 | Garg Vipin KDirector, President and CEO | Shares withheld for tax F | −18,157 | 6.98 | 315,921 | Form 4 |
| 2025-01-25 | Harris Matthew ScottChief Medical Officer | Option exercise M | +14,600 | – | 69,719 | Form 4 |
| 2025-01-25 | Harris Matthew ScottChief Medical Officer | Shares withheld for tax F | −4,994 | 6.98 | 64,725 | Form 4 |
| 2025-01-25 | Jordt Raymond MChief Business Officer | Option exercise M | +14,600 | – | 36,150 | Form 4 |
| 2025-01-25 | Jordt Raymond MChief Business Officer | Shares withheld for tax F | −3,862 | 6.98 | 32,288 | Form 4 |
| 2025-01-25 | Roberts M ScotChief Scientific Officer | Option exercise M | +14,600 | – | 57,910 | Form 4 |
| 2025-01-25 | Roberts M ScotChief Scientific Officer | Shares withheld for tax F | −4,264 | 6.98 | 53,646 | Form 4 |
| 2025-01-01 | Jordt Raymond MChief Business Officer | Option exercise M | +9,375 | – | 24,035 | Form 4 |
| 2025-01-01 | Jordt Raymond MChief Business Officer | Shares withheld for tax F | −2,485 | 7.21 | 21,550 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.