NASDAQ · ALT

Altimmune, Inc.

Closing price · Nov 13, 2026 $1.645
Last insider buy price $1.62 Paid by CFO Gregory Weaver on Nov 13, 2026 (Form 4). Not today's price.

Latest quarter · ended Sep 30, 2026

Cash got weaker

descriptionFiled Nov 12, 2026
Cash from operationsWorse
−$37.7M
Quarter ended Dec 31, 2024: −$18.3M cash from operationsQuarter ended Mar 31, 2025: −$16.8M cash from operationsQuarter ended Jun 30, 2025: −$19.4M cash from operationsQuarter ended Sep 30, 2025: −$11.9M cash from operationsQuarter ended Dec 31, 2025: −$19.4M cash from operationsQuarter ended Mar 31, 2026: −$20.9M cash from operationsQuarter ended Jun 30, 2026: −$24.2M cash from operationsQuarter ended Sep 30, 2026: −$37.7M cash from operations
Dec '24Sep '26
vs. −$11.9M a year ago
Share countDiluting
+86.6%
Quarter ended Dec 31, 2024: 77.01M sharesQuarter ended Mar 31, 2025: 81.11M sharesQuarter ended Jun 30, 2025: 88.26M sharesQuarter ended Sep 30, 2025: 104.25M sharesQuarter ended Dec 31, 2025: 130.07M sharesQuarter ended Mar 31, 2026: 194.47M sharesQuarter ended Jun 30, 2026: 194.52M sharesQuarter ended Sep 30, 2026: 194.59M shares
Dec '24Sep '26
194.59M shares vs. 104.25M a year ago

Numbers come from the company's own 10-Q and 10-K reports filed with the SEC. Each bar is one quarter, oldest on the left. The colored bar is the latest. Hover over or tap a bar to see its number.

Smart money pulse

What insiders and funds are doing

Buying Insiders: as of Nov 13 Funds: as of Jun 30, 2026
−1000+100 +100
  • group
    3 insiders bought in the last 30 days. $82.2K in open-market buys, Nov 13.
  • account_balance
    11 funds bought, 0 sold in the quarter ended Jun 30, 2026, counting funds that hold 500 stocks or fewer and $1M+ of this one. Index funds and banks are left out.
  • info
    No real insider sales in 12 months. Planned 10b5-1 sales and tax withholding are left out.

−100 means everyone selling, +100 everyone buying. This is data, not advice.

How the Pulse works

Pulse runs from −100 (everyone selling) to +100 (everyone buying). Half comes from insiders: real buyers vs. real sellers in the last 90 days (Form 4). Half comes from funds: funds that bought vs. funds that sold last quarter (13F). 13F is a snapshot of long positions on the last day of the quarter, filed up to 45 days later. It does not show short positions or trades since then.

Who owns it

210 funds report owning ALT, up from 171

Holdings as of Jun 30, 2026
New60
Added84
Held38
Trimmed28
Sold out21

Last quarter

Who bought and who sold

Apr–Jun 2026
Deep Track Capital, LP
New
TCG Crossover Management, LLC
New
Viking Global Investors LP
New
Ra Capital Management, L.P.
New
Trails Edge Capital Partners, LP
New
Great Point Partners LLC
New
Nantahala Capital Management, LLC
New
Cormorant Asset Management, LP
New

Change in shares held from Mar 31 to Jun 30, 2026, biggest holdings first. Only funds that hold 500 stocks or fewer and $1M+ of this one: index funds and banks own almost everything, so their changes say little. Bars stop at ±100%.

Insider trades · last 12 months

Real buys and sales

● Open-market buy● Open-market sale
CEOCFOOther officersDirectorsDecJanFebMarAprMayJunJulAugSepOctNovOption exercise · Jan 1 · 9,375 shShares withheld for tax · Jan 1 · $8.93KShares withheld for tax · Jan 25 · $98.9KOption exercise · Jan 25 · 42,050 shShares withheld for tax · Jan 25 · $45.3K · 2 peopleOption exercise · Jan 25 · 29,200 sh · 2 peopleOption exercise · Jan 27 · 41,200 shShares withheld for tax · Jan 27 · $111KShares withheld for tax · Jan 27 · $55.5K · 2 peopleOption exercise · Jan 27 · 31,700 sh · 2 peopleShares withheld for tax · Jan 30 · $65.1KOption exercise · Jan 30 · 26,775 shOption exercise · Jan 30 · 9,275 shShares withheld for tax · Jan 30 · $16KStock grant · Jan 31 · $21.3KStock grant · Jan 31 · $31.1K · 2 peopleShares withheld for tax · Feb 2 · $12.9KOption exercise · Feb 2 · 7,775 shStock grant · Jul 31 · $2.11KStock grant · Jul 31 · $4.22KOption exercise · Sep 16 · 24,000 shShares withheld for tax · Sep 16 · $22.1KOption exercise · Oct 1 · 37,500 shShares withheld for tax · Oct 1 · $35KOption exercise · Oct 1 · 14,475 shShares withheld for tax · Oct 1 · $12.1KOption exercise · Nov 11 · 18,750 shShares withheld for tax · Nov 11 · $10.9KOpen-market buy · Dec 22 · $51.6KOpen-market buy · Dec 23 · $51.2KOpen-market buy · Dec 29 · $2KOpen-market buy · Jan 5 · $2.12KOpen-market buy · Jan 8 · $20.4KOpen-market buy · Mar 6 · $70.8KOpen-market buy · Mar 6 · $17.7KOpen-market buy · Apr 1 · $47.1KOpen-market buy · Apr 1 · $31.5KOpen-market buy · Apr 6 · $31.4KOpen-market buy · Aug 13 · $44.2KOpen-market buy · Nov 13 · $49.7KOpen-market buy · Nov 13 · $16.4KOpen-market buy · Nov 13 · $16.2K
CEOCFOOther officersDirectorsJunJulAugSepOctNovStock grant · Jul 31 · $2.11KStock grant · Jul 31 · $4.22KOption exercise · Sep 16 · 24,000 shShares withheld for tax · Sep 16 · $22.1KOption exercise · Oct 1 · 37,500 shShares withheld for tax · Oct 1 · $35KOption exercise · Oct 1 · 14,475 shShares withheld for tax · Oct 1 · $12.1KOption exercise · Nov 11 · 18,750 shShares withheld for tax · Nov 11 · $10.9KOpen-market buy · Aug 13 · $44.2KOpen-market buy · Nov 13 · $49.7KOpen-market buy · Nov 13 · $16.4KOpen-market buy · Nov 13 · $16.2K

Last 6 months. A wider screen shows 12.

Showing 14 real trades. Hidden: 5 stock grants, 14 tax withholdings, 14 option exercises. Those happen on a schedule and say little about what an insider thinks. Bigger dot means a bigger trade.

Real trades, newest first

Nov 13 Jerome Durso President and CEO, Director Open-market buy $49.7K 30,700 sh at $1.62
Nov 13 Wayne Pisano Director Open-market buy $16.4K 10,000 sh at $1.64
Nov 13 Gregory Weaver CFO Open-market buy $16.2K 10,000 sh at $1.62
Aug 13 Jerome Durso President and CEO, Director Open-market buy $44.2K 15,000 sh at $2.95
Apr 6 John Gill Director Open-market buy $31.4K 9,200 sh at $3.41
Apr 1 Jerome Durso President and CEO, Director Open-market buy $47.1K 15,000 sh at $3.14
Apr 1 Gregory Weaver CFO Open-market buy $31.5K 10,000 sh at $3.15
Mar 6 Jerome Durso President and CEO, Director Open-market buy $70.8K 20,000 sh at $3.54
Mar 6 Gregory Weaver CFO Open-market buy $17.7K 5,000 sh at $3.54
Jan 8 Wayne Pisano Director Open-market buy $20.4K 5,000 sh at $4.08
Show 4 older real trades
Jan 5 Catherine Sohn Director Open-market buy $2.12K 500 sh at $4.24
Dec 29 Diane Jorkasky Director Open-market buy $2K 527 sh at $3.80
Dec 23 John Gill Director Open-market buy $51.2K 12,500 sh at $4.10
Dec 22 Jerome Durso Director Open-market buy $51.6K 12,500 sh at $4.13

Showing every filing. Dashed circles are routine: grants, tax withholding, option exercises and planned sales.

Top holders

Biggest funds in ALT

As of Jun 30, 2026
FundOwnsValueChange
BlackRock, Inc.10.5%$62M+59%
Deep Track Capital, LP9.9%$58.5MNew
State Street Corp6.2%$36.8M+69%
TCG Crossover Management, LLC5.1%$30.4MNew
Vanguard Capital Management LLC4.2%$24.9M+45%

"Owns" is shares reported divided by shares outstanding.

Where this data comes from. Insider trades, fund holdings, activist stakes and company results come from public SEC EDGAR filings (Forms 4, 13F, 13D/13G, 10-Q and 8-K). Congress trades come from the STOCK Act reports members file with the House Clerk and the Senate. Daily closing prices come from post-no-preference/stocks on DoltHub, a community-run database shared under CC BY-SA 4.0; the prices we show stay under that license. They are each day's close, not live or official exchange prices.

This is data, not investment advice. About StockToast