Altimmune, Inc.
ALT- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001326190
In the last 90 days, Altimmune, Inc. insiders filed 1 open-market purchase and 0 sales; 210 institutions reported holding it in 13F filings for Q2 2026, worth $456.1M in total; Viking Global Investors is the only superinvestor holding it.
13F holders, Q1 2026
Institutional positions in Altimmune, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 173
- −5 vs. Q4 2025
- Shares held
- 69.4M
- +23.8M (+52.3%) vs. Q4 2025
- Total value
- $213.5M
- +$49.0M (+29.8%) vs. Q4 2025
- New holders
- 30
- 82 more added
- Sold out
- 35
- 34 more reduced
5 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ALT on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 210 | $456.1M |
| Q1 2026 | 173 | $213.5M |
| Q4 2025 | 183 | $198.8M |
| Q3 2025 | 159 | $156.4M |
| Q2 2025 | 180 | $145.5M |
| Q1 2025 | 177 | $191.2M |
| Q4 2024 | 183 | $292.3M |
| Q3 2024 | 169 | $243.0M |
| Q2 2024 | 173 | $282.1M |
| Q1 2024 | 171 | $452.2M |
| Q4 2023 | 143 | $377.1M |
| Q3 2023 | 113 | $79.2M |
| Q2 2023 | 120 | $124.5M |
| Q1 2023 | 133 | $205.4M |
| Q4 2022 | 128 | $769.9M |
| Q3 2022 | 122 | $588.1M |
| Q2 2022 | 111 | $466.9M |
| Q1 2022 | 103 | $207.4M |
| Q4 2021 | 102 | $295.8M |
| Q3 2021 | 119 | $375.3M |
| Q2 2021 | 109 | $269.2M |
| Q1 2021 | 98 | $336.5M |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Altimmune, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 12,795,277 | $39.4M | 0.00% | +3,090,979+31.9% | Added |
| State Street Corp | 7,145,550 | $22.0M | 0.00% | +2,025,847+39.6% | Added |
| Vanguard Capital Management LLC | 5,658,049 | $17.4M | 0.00% | +5,658,049 | New |
| Vanguard Portfolio Management LLC | 5,382,002 | $16.6M | 0.00% | +5,382,002 | New |
| Marshall Wace, LLP | 4,017,901 | $12.4M | 0.01% | +3,095,124+335.4% | Added |
| Millennium Management LLC | 3,258,191 | $10.0M | 0.01% | +3,050,808+1,471.1% | Added |
| Geode Capital Management, LLC | 3,107,096 | $9.57M | 0.00% | +814,686+35.5% | Added |
| Alyeska Investment Group, L.P. | 2,644,600 | $8.15M | 0.02% | +2,644,600 | New |
| Two Sigma Investments, LP | 2,478,900 | $7.64M | 0.01% | +1,213,217+95.9% | Added |
| Nuveen, LLC | 2,334,601 | $7.19M | 0.00% | +1,090,390+87.6% | Added |
| Goldman Sachs Group Inc | 1,350,649 | $4.16M | 0.00% | +1,356+0.1% | Added |
| Susquehanna International Group, LLP | 1,325,956 | $4.08M | 0.01% | −43,061−3.1% | Reduced |
| Dimensional Fund Advisors LP | 1,045,926 | $3.22M | 0.00% | +762,223+268.7% | Added |
| Northern Trust Corp | 996,721 | $3.07M | 0.00% | +280,730+39.2% | Added |
| UBS Group AG | 904,768 | $2.79M | 0.00% | +262,720+40.9% | Added |
| Vanguard Fiduciary Trust Co | 869,318 | $2.68M | 0.00% | +869,318 | New |
| Morgan Stanley | 775,258 | $2.39M | 0.00% | −584,627−43.0% | Reduced |
| D. E. Shaw & Co., Inc. | 727,001 | $2.24M | 0.00% | −616,582−45.9% | Reduced |
| FMR LLC | 673,964 | $2.08M | 0.00% | +109,871+19.5% | Added |
| Tang Capital Management LLC | 666,022 | $2.05M | 0.10% | −1,465,285−68.8% | Reduced |
| Point72 Asset Management, L.P. | 665,289 | $2.05M | 0.00% | +665,289 | New |
| Schroder Investment Management Group | 667,837 | $1.92M | 0.00% | +198,824+42.4% | Added |
| Bank of America Corp | 570,203 | $1.76M | 0.00% | +186,420+48.6% | Added |
| Citadel Advisors LLC | 448,873 | $1.38M | 0.00% | −889,054−66.5% | Reduced |
| BNP Paribas Arbitrage, SA | 435,078 | $1.34M | 0.00% | +257,773+145.4% | Added |
| Bank of New York Mellon Corp | 413,503 | $1.27M | 0.00% | +59,302+16.7% | Added |
| Beirne Wealth Consulting Services, LLC | 411,858 | $1.27M | 0.36% | +35,400+9.4% | Added |
| Charles Schwab Investment Management Inc | 351,681 | $1.08M | 0.00% | +68,012+24.0% | Added |
| Steward Partners Investment Advisory, LLC | 251,781 | $775.5K | 0.00% | +6,388+2.6% | Added |
| Wellington Management Group LLP | 248,158 | $764.3K | 0.00% | −9,113−3.5% | Reduced |
| Mangrove Partners | 239,280 | $737.0K | 0.06% | +239,280 | New |
| Baird Financial Group, Inc. | 237,522 | $731.6K | 0.00% | +118,082+98.9% | Added |
| Brown Wealth Management, LLC | 236,136 | $727.3K | 0.19% | −22,537−8.7% | Reduced |
| Rafferty Asset Management, LLC | 231,271 | $712.3K | 0.00% | +35,505+18.1% | Added |
| Invesco Ltd. | 227,857 | $701.8K | 0.00% | +13,033+6.1% | Added |
| Hennion & Walsh Asset Management, Inc. | 201,989 | $622.1K | 0.02% | −12,643−5.9% | Reduced |
| Barclays PLC | 192,871 | $594.0K | 0.00% | −207,724−51.9% | Reduced |
| Janney Montgomery Scott LLC | 172,610 | $532.0K | 0.00% | +70,000+68.2% | Added |
| Commonwealth Equity Services, LLC | 160,374 | $493.9K | 0.00% | −21,109−11.6% | Reduced |
| Knoll Capital Management, LLC | 160,000 | $492.8K | 0.27% | −961,524−85.7% | Reduced |
| Rhumbline Advisers | 155,671 | $479.5K | 0.00% | +34,158+28.1% | Added |
| HSBC Holdings PLC | 154,365 | $476.2K | 0.00% | +22,144+16.7% | Added |
| Stifel Financial Corp | 134,616 | $414.6K | 0.00% | +11,200+9.1% | Added |
| Wealth Effects LLC | 131,950 | $406.4K | 0.14% | +20,200+18.1% | Added |
| Man Group plc | 129,846 | $399.9K | 0.00% | +110,910+585.7% | Added |
| Grantham, Mayo, Van Otterloo & Co. LLC | 126,389 | $389.3K | 0.00% | −46,170−26.8% | Reduced |
| Deutsche Bank AG | 124,516 | $383.5K | 0.00% | +44,576+55.8% | Added |
| JPMorgan Chase & Co | 127,498 | $367.2K | 0.00% | +22,966+22.0% | Added |
| Engineers Gate Manager LP | 116,112 | $357.6K | 0.00% | +28,848+33.1% | Added |
| Jefferies Financial Group Inc. | 110,000 | $338.8K | 0.00% | −47,800−30.3% | Reduced |
| Alps Advisors Inc | 105,881 | $326.1K | 0.00% | +20,204+23.6% | Added |
| LPL Financial LLC | 103,756 | $319.6K | 0.00% | +55,130+113.4% | Added |
| Silvercrest Asset Management Group LLC | 103,500 | $318.8K | 0.00% | 00.0% | Unchanged |
| Summit Financial Wealth Advisors, LLC | 103,288 | $318.1K | 0.05% | 00.0% | Unchanged |
| Profund Advisors LLC | 103,141 | $317.7K | 0.01% | +30,843+42.7% | Added |
| Nomura Asset Management International Inc. | 100,000 | $308.0K | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 95,907 | $295.4K | 0.00% | −45,375−32.1% | Reduced |
| Price T Rowe Associates Inc | 92,512 | $285.0K | 0.00% | +42,633+85.5% | Added |
| AQR Capital Management LLC | 85,454 | $263.2K | 0.00% | +64,307+304.1% | Added |
| Alliancebernstein L.P. | 71,760 | $259.1K | 0.00% | 00.0% | Unchanged |
| Brevan Howard Capital Management LP | 78,403 | $241.5K | 0.00% | −35,725−31.3% | Reduced |
| Kingswood Wealth Advisors, LLC | 76,500 | $235.6K | 0.01% | +40,500+112.5% | Added |
| Citigroup Inc | 76,327 | $235.1K | 0.00% | +48,003+169.5% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 77,292 | $234.8K | 0.00% | +24,726+47.0% | Added |
| Caption Management, LLC | 74,438 | $229.3K | 0.01% | 00.0% | Unchanged |
| MetLife Investment Management | 72,213 | $222.4K | 0.00% | +34,020+89.1% | Added |
| Ameriprise Financial Inc | 71,968 | $221.7K | 0.00% | −1,870−2.5% | Reduced |
| Virtu Financial LLC | 70,540 | $217.0K | 0.01% | +12,063+20.6% | Added |
| Leonteq Securities AG | 65,000 | $200.2K | 0.01% | +64,000+6,400.0% | Added |
| American Century Companies Inc | 62,909 | $193.8K | 0.00% | +62,909 | New |
| PVG Asset Management Corp | 66,120 | $174.6K | 0.10% | +66,120 | New |
| SG Americas Securities, LLC | 55,625 | $171.0K | 0.00% | +45,050+426.0% | Added |
| Raymond James Financial Inc | 53,796 | $165.7K | 0.00% | −2,063−3.7% | Reduced |
| Canada Pension Plan Investment Board | 53,300 | $164.2K | 0.00% | +23,300+77.7% | Added |
| Virtus Investment Advisers, Inc. | 51,743 | $159.4K | 0.04% | +1,261+2.5% | Added |
| ExodusPoint Capital Management, LP | 48,619 | $149.7K | 0.00% | +36,698+307.8% | Added |
| Axq Capital, LP | 47,752 | $147.1K | 0.02% | +22,051+85.8% | Added |
| Rockefeller Capital Management L.P. | 46,370 | $142.8K | 0.00% | +3,203+7.4% | Added |
| Vanguard Global Advisers, LLC | 42,826 | $131.9K | 0.00% | +42,826 | New |
| Creative Planning | 39,229 | $120.8K | 0.00% | −7,657−16.3% | Reduced |
| Kovack Advisors, Inc. | 36,250 | $111.7K | 0.01% | +1,035+2.9% | Added |
| EverSource Wealth Advisors, LLC | 35,650 | $109.8K | 0.00% | +17,967+101.6% | Added |
| Cetera Investment Advisers | 35,453 | $109.2K | 0.00% | +5,766+19.4% | Added |
| Police & Firemen's Retirement System of New Jersey | 35,433 | $109.1K | 0.00% | +11,860+50.3% | Added |
| Manufacturers Life Insurance Company, The | 34,763 | $107.1K | 0.00% | +7,167+26.0% | Added |
| MML Investors Services, LLC | 34,550 | $106.4K | 0.00% | 00.0% | Unchanged |
| Intech Investment Management LLC | 30,761 | $94.7K | 0.00% | −21,796−41.5% | Reduced |
| CI Private Wealth, LLC | 30,553 | $94.1K | 0.00% | +30,553 | New |
| TCG Advisory Services, LLC | 30,218 | $93.1K | 0.00% | +16,000+112.5% | Added |
| E Fund Management Co., Ltd. | 29,072 | $89.5K | 0.00% | +29,072 | New |
| Blair William & Co | 28,223 | $86.9K | 0.00% | −28,211−50.0% | Reduced |
| Farallon Capital Management, L.L.C. | 27,600 | $85.0K | 0.00% | 00.0% | Unchanged |
| Voleon Capital Management LP | 27,142 | $83.6K | 0.00% | −19,913−42.3% | Reduced |
| Concurrent Investment Advisors, LLC | 26,508 | $81.6K | 0.00% | 00.0% | Unchanged |
| Jones Financial Companies LLLP | 25,869 | $78.1K | 0.00% | +13,343+106.5% | Added |
| Royal Bank of Canada | 25,317 | $78.0K | 0.00% | −2,097−7.6% | Reduced |
| ProShare Advisors LLC | 24,523 | $75.5K | 0.00% | +3,707+17.8% | Added |
| Polymer Capital Management (US) LLC | 23,999 | $73.9K | 0.01% | +23,999 | New |
| Simplex Trading, LLC | 22,841 | $70.3K | 0.00% | +22,841 | New |
| China Universal Asset Management Co., Ltd. | 22,223 | $68.4K | 0.01% | +5,220+30.7% | Added |