ALT
Altimmune, Inc.After hours2.43−0.13 −5.08%USD
NasdaqGM · as of Oct 13, 16:00 ET · 15m delayAfter hours 2.46 +1.23%
Open
2.56
Prev close
2.56
Day range
2.432.56
52-week range
2.436.44
Volume
3.70M0.88×
Mkt cap
472.68M
P/E ttm
—
Fwd P/E
-3.64
EPS ttm
-0.7600
Div yield
0.00%
Earnings
Aug 12, 2026
From 52w high
−62.27%
ALT shareholders
ALT Ownership
13F / N-PORT filings via Yahoo
Institutions
77.9%
78.2% of the float
Insiders
0.4%
officers and directors
Institutional holders
274
filing positions
Top 10 institutions
52.6%
10 adding · 0 trimming
Top Institutions
| Holder | % held | Shares | Value | Change | As of |
|---|---|---|---|---|---|
| Blackrock Inc. | 10.48% | 20.39M | $49.54M | +59.3% | Jun 30, 2026 |
| Deep Track Capital, Lp | 9.90% | 19.25M | $46.78M | +100.0% | Jun 30, 2026 |
| State Street Corporation | 6.22% | 12.10M | $29.40M | +69.3% | Jun 30, 2026 |
| TCG Crossover Management, LLC | 5.14% | 10.00M | $24.30M | +100.0% | Jun 30, 2026 |
| Vanguard Capital Management LLC | 4.20% | 8.18M | $19.87M | +44.5% | Jun 30, 2026 |
| Vanguard Portfolio Management LLC | 3.77% | 7.33M | $17.81M | +36.2% | Jun 30, 2026 |
| Marshall Wace LLP | 3.52% | 6.84M | $16.62M | +70.3% | Jun 30, 2026 |
| Viking Global Investors, L.P. | 3.44% | 6.70M | $16.28M | +100.0% | Jun 30, 2026 |
| RA Capital Management, L.P. | 3.34% | 6.50M | $15.79M | +100.0% | Jun 30, 2026 |
| Geode Capital Management, LLC | 2.58% | 5.01M | $12.18M | +61.3% | Jun 30, 2026 |
Top Funds
| Holder | % held | Shares | Value | Change | As of |
|---|---|---|---|---|---|
| SPDR SERIES TRUST-State Street SPDR S&P Biotech ETF | 4.39% | 8.55M | $20.77M | +7.5% | Aug 31, 2026 |
| VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund | 2.96% | 5.75M | $13.97M | +40.0% | Jun 30, 2026 |
| iShares Trust-iShares Russell 2000 ETF | 2.61% | 5.08M | $12.35M | +0.7% | Aug 31, 2026 |
| VANGUARD HORIZON FUNDS-Vanguard Strategic Equity Fund | 1.30% | 2.52M | $6.12M | +37.3% | Jun 30, 2026 |
| VANGUARD INDEX FUNDS-Vanguard Extended Market Index Fund | 1.15% | 2.24M | $5.43M | +58.0% | Jun 30, 2026 |
| Fidelity Salem Street Trust-Fidelity Small Cap Index Fund | 1.12% | 2.17M | $5.28M | +0.5% | Jul 31, 2026 |
| iShares Trust-iShares Russell 2000 Value ETF | 0.95% | 1.85M | $4.49M | +0.5% | Aug 31, 2026 |
| Fidelity Covington Trust-Fidelity Enhanced Small Cap Core ETF | 0.75% | 1.45M | $3.52M | +3.6% | Sep 30, 2026 |
| iShares Trust-iShares Biotechnology ETF | 0.70% | 1.37M | $3.33M | +2.5% | Aug 31, 2026 |
| Vanguard Explorer Fund | 0.62% | 1.21M | $2.95M | 0.0% | Jul 31, 2026 |
Institutions report quarterly, up to 45 days after the quarter ends, so these positions can be months old. Change compares the share count with the holder's previous filing. Insider transactions are on the overview page (INSD).