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ALT · Altimmune, Inc.

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$3.30 +0.21 (+6.80%)
Market Cap
$604.95M
Shares
194.52M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 211
Total Value: $465,947,574
Total Shares: 153,272,267
Showing 1–100 of 220 holdings by value · page 1 of 3

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 211 13F filers · Δ vs Mar 31, 2026
Top Holder
13.3%
Sep 2023 → Jun 2026 · range 11.7% – 18.7%
−4.6 pts
Top 5
45.6%
Sep 2023 → Jun 2026 · range 44.2% – 50.4%
−3.4 pts
Top 10
66.7%
Sep 2023 → Jun 2026 · range 60.8% – 68.5%
−1.8 pts
HHI
593
Sep 2023 → Jun 2026 · range 546 – 709
Broadly held−90

Quarterly Activity

vs Mar 31, 2026
New
58
Increased
86
Decreased
33
Sold Out
21
Unchanged
34
Holder count: +37
Institutional value: +111.8%
Shares held: +114.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 220
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1326190 CUSIP 02155H200 13F (30d) 174 filings 174 filers Visit website Investor relations