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ALT

Altimmune (ALT) stock: insider trades, news & valuation

Strong buying
Close · Oct 9, 2026 $2.61 +0.4% on the day -34.8% over 12 months 52-week range $2.59 – $6.18

Share price and insider trades

ALT closeInsider buyInsider sale
2468NovDecJan 2026FebMarAprMayJunJulAugSepOctEEarnings release filed 2025-11-06EEarnings release filed 2026-03-05EEarnings release filed 2026-05-13EEarnings release filed 2026-08-12Bought $2,003 on 2025-12-29 · Diane JorkaskyBought $2,120 on 2026-01-05 · Catherine A. SohnBought $20,400 on 2026-01-08 · Wayne PisanoBought $31,372 on 2026-04-06 · John GillBought $44,250 on 2026-08-13 · Jerome Benedict DursoBought $51,250 on 2025-12-23 · John GillBought $51,625 on 2025-12-22 · Jerome Benedict DursoBought $78,600 on 2026-04-01 · Gregory L Weaver, Jerome Benedict DursoBought $88,500 on 2026-03-06 · Gregory L Weaver, Jerome Benedict Durso
Bought, 12 months$366K
Sold, 12 months$0
Insiders buying4
Insiders selling0

Altimmune insider trading at a glance (Oct 9, 2026): in the past 12 months, 4 insiders bought $366K and 0 sold $0 of ALT stock on the open market, including a cluster buy that began Apr 1, 2026.

ALT insider buying and selling by quarter

Open-market purchases (green, above the line) and sales (red, below), by trade date.

Q4 2025: $105K bought (3 trades)$105KQ4 2025Q1 2026: $111K bought (4 trades)$111KQ1 2026Q2 2026: $110K bought (3 trades)$110KQ2 2026Q3 2026: $44K bought (1 trades)$44KQ3 2026Q4 2026
QuarterBoughtPurchasesSoldSales
Q4 2026—0—0
Q3 2026$44K1—0
Q2 2026$110K3—0
Q1 2026$111K4—0
Q4 2025$105K3—0

Valuation, profit and volume

P/E (trailing)n/aSector median —
Market value— 
Profit margin—Revenue growth —
Volume vs. 50-day1.0×Last 5 sessions
Insiders' paper profit−$95KOn all tracked purchases -25.8%

Summary

Over the past 12 months, 4 Altimmune, Inc. insiders reported open-market purchases totaling $366K, while 0 insiders reported sales totaling $0. The most recent cluster buy began on Apr 1, 2026, when 3 insiders bought a combined $110K. Among insiders with enough purchase history to measure, John Gill (Director) has the highest Insider Score at 26.

ALT earnings: how the stock reacted

Each quarterly results release (SEC 8-K Item 2.02), the trend before it, insider trades in the 30 days before, and the 2-day market reaction. “E” marks releases on the chart above.

Does it matter? →
Release15 days beforeInsiders, 30 days beforeReaction (2 days)Next 30 days
Aug 12, 2026 +1.4% None -4.0%S&P +0.9% +13.5%
May 13, 2026 +10.0% None -5.2%S&P +1.4% -10.6%
Mar 5, 2026 -5.1% None -17.1%S&P -1.9% -5.6%
Nov 6, 2025 -7.2% None +9.6%S&P -1.0% +27.5%
Aug 12, 2025 -17.2% None +10.7%S&P +1.4% -2.7%
May 13, 2025 +18.5% None -5.2%S&P +0.8% +21.4%
Feb 27, 2025 -5.6% None +12.0%S&P -0.1% -20.0%
Nov 12, 2024 +9.9% None +29.5%S&P -0.3% -5.1%

Most companies bar insiders from trading in the weeks before results, so pre-earnings purchases are rare and often made by directors or under pre-set plans. Past reactions don't predict future ones.

Insider transactions

Open-market purchases and sales.

Filed Insider Type Shares Price Value Since Score
Aug 13SEC Jerome Benedict DursoCEO, President Buy 15,00062,500 held (+32%) $2.95 $44K -11.5% 13
Apr 6SEC John GillDirector Buy 9,20021,700 held (+74%) $3.41 $31K -23.5% 26
Apr 1SEC Jerome Benedict DursoCEO, President Buy 15,00047,500 held (+46%) $3.14 $47K -16.9% 13
Apr 1SEC Gregory L WeaverCFO Buy 10,00038,078 held (+36%) $3.15 $32K -17.1% 13
Mar 9SEC Jerome Benedict DursoCEO, President Buy 20,00032,500 held (+160%) $3.54 $71K -26.3% 13
Mar 9SEC Gregory L WeaverCFO Buy 5,00028,078 held (+22%) $3.54 $18K -26.3% 13
Jan 9SEC Wayne PisanoDirector Buy 5,00013,498 held (+59%) $4.08 $20K -36.0% 20
Jan 5SEC Catherine A. SohnDirector Buy 5001,500 held (+50%) $4.24 $2K -38.4% —
Dec 29SEC Diane JorkaskyDirector Buy 527new position $3.80 $2K -31.3% —
Dec 23SEC John GillDirector Buy 12,500new position $4.10 $51K -36.3% 26
Dec 22SEC Jerome Benedict DursoDirector Buy 12,500new position $4.13 $52K -36.8% 13

Insiders at Altimmune, Inc.

InsiderBoughtSoldLast filingScore
Jerome Benedict DursoCEO, President $214K — Aug 13, 2026 13
John GillDirector $83K — Apr 6, 2026 26
Gregory L WeaverCFO $49K — Apr 1, 2026 13
Wayne PisanoDirector $20K — Jan 9, 2026 20
Catherine A. SohnDirector $2K — Jan 5, 2026 —
Diane JorkaskyDirector $2K — Dec 29, 2025 —

ALT stock: common questions

Are Altimmune, Inc. insiders buying ALT stock?

In the past 12 months, 4 insiders reported open-market purchases of ALT worth $366K. The latest was CEO, President Jerome Benedict Durso bought $44K of ALT at $2.95 — raises the stake by 32%.

Are Altimmune, Inc. insiders selling ALT stock?

0 insiders reported sales worth $0 over the same period.

Where does this data come from?

Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.

What is ALT's 52-week range?

Over the past year ALT has traded between $2.59 and $6.18. It last closed at $2.61 on Oct 9, 2026.