ALT Institutional Ownership & Shareholders
ALTIMMUNE INC (ALT) is currently held by 209 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $455.58M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of ALT tracked by InsiderSet, reporting ownership valued at approximately $61.97M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $53.21M, representing an estimated loss of -14.14% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 68% of the total disclosed ALT value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Deep Track Capital, Lp, State Street Corp, and several other long-term asset managers with concentrated positions in ALTIMMUNE INC (ALT).
This page ranks the largest institutional ALT shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
209
Total Reported Value
$455.58M
Largest Holder
Blackrock, Inc.
Largest Position
$61.97M
Insider Transactions (90d)
7
Latest Filing Quarter
Q2 2026
New Institutional Positions
72
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 20,385,284 | $61,971,264 | $53,205,591 | -$8,765,673 | -14.14% | |
| Deep Track Capital, Lp | 0.86% | 19,250,000 | $58,520,000 | $50,242,500 | -$8,277,500 | -14.14% | |
| State Street Corp | 0.00% | 12,098,540 | $36,779,562 | $31,577,189 | -$5,202,373 | -14.14% | |
| Tcg Crossover Management, Llc | 0.73% | 10,000,000 | $30,400,000 | $26,100,000 | -$4,300,000 | -14.14% | |
| Vanguard Capital Management Llc | 0.00% | 8,177,752 | $24,860,366 | $21,343,933 | -$3,516,433 | -14.14% | |
| Vanguard Portfolio Management Llc | 0.00% | 7,330,265 | $22,284,006 | $19,131,992 | -$3,152,014 | -14.14% | |
| Marshall Wace, Llp | 0.02% | 6,841,055 | $20,796,808 | $17,855,154 | -$2,941,654 | -14.14% | |
| Viking Global Investors | Ole Andreas Halvorsen | 0.06% | 6,700,000 | $20,368,000 | $17,487,000 | -$2,881,000 | -14.14% |
| Ra Capital Management, L.P. | 0.17% | 6,500,000 | $19,760,000 | $16,965,000 | -$2,795,000 | -14.14% | |
| Geode Capital Management, Llc | 0.00% | 5,011,314 | $15,238,163 | $13,079,530 | -$2,158,633 | -14.17% | |
| Woodline Partners Lp | 0.03% | 3,400,312 | $10,336,948 | $8,874,814 | -$1,462,134 | -14.14% | |
| Millennium Management Llc | 0.01% | 3,309,122 | $10,059,731 | $8,636,808 | -$1,422,923 | -14.14% | |
| Trails Edge Capital Partners, Lp | 1.28% | 2,660,000 | $8,086,400 | $6,942,600 | -$1,143,800 | -14.14% | |
| Nuveen, Llc | 0.00% | 2,405,354 | $7,312,276 | $6,277,974 | -$1,034,302 | -14.14% | |
| Two Sigma Investments, Lp | 0.01% | 2,381,142 | $7,238,672 | $6,214,781 | -$1,023,891 | -14.14% | |
| Goldman Sachs Group Inc | 0.00% | 2,214,450 | $6,731,928 | $5,779,715 | -$952,214 | -14.14% | |
| Great Point Partners Llc | 1.25% | 1,741,232 | $5,293,345 | $4,544,616 | -$748,729 | -14.14% | |
| Northern Trust Corp | 0.00% | 1,599,226 | $4,861,648 | $4,173,980 | -$687,668 | -14.14% | |
| Weiss Asset Management Lp | 0.05% | 1,530,803 | $4,653,641 | $3,995,396 | -$658,245 | -14.14% | |
| Nantahala Capital Management, Llc | 0.28% | 1,500,000 | $4,560,000 | $3,915,000 | -$645,000 | -14.14% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,293,001 | $3,930,723 | $3,374,733 | -$555,990 | -14.14% | |
| Cormorant Asset Management, Lp | 0.19% | 1,250,000 | $3,800,000 | $3,262,500 | -$537,500 | -14.14% | |
| Aqr Capital Management Llc | 0.00% | 1,220,949 | $3,711,686 | $3,186,677 | -$525,009 | -14.14% | |
| Citadel Advisors Llc | 0.00% | 983,559 | $2,990,019 | $2,567,089 | -$422,930 | -14.14% | |
| Ubs Group Ag | 0.00% | 866,385 | $2,633,810 | $2,261,265 | -$372,545 | -14.14% | |
| Morgan Stanley | 0.00% | 758,435 | $2,305,642 | $1,979,515 | -$326,127 | -14.14% | |
| Bank Of America Corp | 0.00% | 757,919 | $2,304,074 | $1,978,169 | -$325,905 | -14.14% | |
| Ghisallo Capital Management Llc | 0.04% | 750,000 | $2,280,000 | $1,957,500 | -$322,500 | -14.14% | |
| Fmr Llc | 0.00% | 748,974 | $2,276,881 | $1,954,822 | -$322,059 | -14.14% | |
| Susquehanna International Group, Llp | 0.00% | 731,078 | $2,222,477 | $1,908,114 | -$314,363 | -14.14% | |
| Bank Of New York Mellon Corp | 0.00% | 689,713 | $2,096,727 | $1,800,151 | -$296,576 | -14.14% | |
| Tang Capital Management Llc | 0.09% | 666,022 | $2,024,707 | $1,738,317 | -$286,390 | -14.14% | |
| Dimensional Fund Advisors Lp | 0.00% | 639,436 | $1,943,537 | $1,668,928 | -$274,609 | -14.13% | |
| Charles Schwab Investment Management Inc | 0.00% | 624,499 | $1,898,477 | $1,629,942 | -$268,535 | -14.14% | |
| Hennion & Walsh Asset Management, Inc. | 0.04% | 518,198 | $1,575,322 | $1,352,497 | -$222,825 | -14.14% | |
| Point72 Asset Management, L.P. | 0.00% | 486,884 | $1,480,127 | $1,270,767 | -$209,360 | -14.14% | |
| Rock Springs Capital Management Lp | 0.07% | 471,465 | $1,433,254 | $1,230,524 | -$202,730 | -14.14% | |
| Beirne Wealth Consulting Services, Llc | 0.26% | 421,858 | $1,282,449 | $1,101,049 | -$181,400 | -14.14% | |
| Wellington Management Group Llp | 0.00% | 420,300 | $1,277,712 | $1,096,983 | -$180,729 | -14.14% | |
| Bnp Paribas Financial Markets | 0.00% | 371,176 | $1,128,375 | $968,769 | -$159,606 | -14.14% | |
| Barclays Plc | 0.00% | 351,587 | $1,068,825 | $917,642 | -$151,183 | -14.14% | |
| Invesco Ltd. | 0.00% | 332,592 | $1,011,079 | $868,065 | -$143,014 | -14.14% | |
| Rhumbline Advisers | 0.00% | 309,606 | $941,193 | $808,072 | -$133,121 | -14.14% | |
| Janney Montgomery Scott Llc | 0.00% | 302,610 | $920,000 | $789,812 | -$130,188 | -14.15% | |
| Lmr Partners Llp | 0.01% | 300,000 | $912,000 | $783,000 | -$129,000 | -14.14% | |
| Citigroup Inc | 0.00% | 293,948 | $893,602 | $767,204 | -$126,398 | -14.14% | |
| Steward Partners Investment Advisory, Llc | 0.00% | 266,671 | $810,680 | $696,011 | -$114,669 | -14.14% | |
| Mangrove Partners Im, Llc | 0.05% | 239,280 | $727,411 | $624,521 | -$102,890 | -14.14% | |
| Baird Financial Group, Inc. | 0.00% | 237,522 | $722,067 | $619,932 | -$102,135 | -14.14% | |
| Brown Wealth Management, Llc | 0.16% | 236,136 | $717,853 | $616,315 | -$101,538 | -14.14% |
Frequently asked questions about ALT
Who are the largest institutional holders of ALT?
The largest institutional holders of ALT reported in the latest SEC Form 13F filings include Blackrock, Inc., Deep Track Capital, Lp, State Street Corp, Tcg Crossover Management, Llc, and Vanguard Capital Management Llc. InsiderSet ranks institutional holders by their latest reported ALT position.
What is ALT institutional ownership?
This page tracks ALT positions reported by institutional investment managers through SEC Form 13F. ALTIMMUNE INC (ALT) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ALT?
InsiderSet currently tracks 209 institutional managers reporting ALT holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ALT shareholders.
How much ALT stock do institutions own?
Institutional investment managers disclosed approximately $455.58M in ALT holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ALT institutional ownership last updated?
The latest ALT institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ALT holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ALT position after the reporting date.
Are institutions buying or selling ALT?
Institutional buying and selling can be analyzed by comparing ALT positions across consecutive 13F reporting periods. InsiderSet's ALT Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ALT ownership changes.
How has ALT institutional ownership changed over time?
InsiderSet tracks ALT institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.