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Who owns Altimmune (ALT) stock

202 funds reported Altimmune (ALT) shares in their latest 13F filings, worth $492M in all. The largest holder is BlackRock ($62.0M). Last quarter 102 funds added to their stakes and 76 cut them.

Largest holders of ALT (13F)Largest holders of ALT (13F)BlackRock$62.0MDeep Track Capital, LP$58.5MState Street$36.8MVanguard Group$34.3MTCG Crossover Management, LLC$30.4MVanguard Capital Management LLC$24.9MVanguard Portfolio Management LLC$22.3MMarshall Wace, LLP$20.8MViking Global Investors LP$20.4MRA Capital Management, L.P.$19.8M

Largest holders (13F)

FundSharesValueChangeQuarter
BlackRock20,385,284$62.0Mincrease2026-06-30
Deep Track Capital, LP19,250,000$58.5Mnew2026-06-30
State Street12,098,540$36.8Mincrease2026-06-30
Vanguard Group9,491,159$34.3Mincrease2025-12-31
TCG Crossover Management, LLC10,000,000$30.4Mnew2026-06-30
Vanguard Capital Management LLC8,177,752$24.9Mincrease2026-06-30
Vanguard Portfolio Management LLC7,330,265$22.3Mincrease2026-06-30
Marshall Wace, LLP6,841,055$20.8Mincrease2026-06-30
Viking Global Investors LP6,700,000$20.4Mnew2026-06-30
RA Capital Management, L.P.6,500,000$19.8Mnew2026-06-30
Geode Capital Management, LLC5,011,314$15.2Mincrease2026-06-30
Woodline Partners LP3,400,312$10.3Mnew2026-06-30
Millennium Management LLC3,309,122$10.1Mincrease2026-06-30
Nantahala Capital Management, LLC3,000,000$9.1Mnew2026-06-30
Trails Edge Capital Partners, LP2,660,000$8.1Mnew2026-06-30

Altimmune's latest quarter

Altimmune, Q4 2025: revenue $26K (+420% year over year), net loss $27.4M, operating cash flow −$19.4M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most ALT stock?

By the latest 13F filings: BlackRock ($62.0M); Deep Track Capital, LP ($58.5M); State Street ($36.8M); Vanguard Group ($34.3M); TCG Crossover Management, LLC ($30.4M).

What is the short interest in ALT?

42,233,791 shares were sold short at the 2026-10-15 settlement, -8.35% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.