ALTIMMUNE INC (ALT) Top Institutional Shareholders
ALTIMMUNE INC (ALT) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $211.93M in ALT holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of ALT tracked by InsiderSet, reporting ownership valued at approximately $39.41M in its March 31, 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 $33.78M, representing an estimated loss of -14.29% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 71% of the total disclosed ALT value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., State Street Corp, Vanguard Capital Management Llc, 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
169
Total Reported Value
$211.93M
Largest Holder
Blackrock, Inc.
Largest Position
$39.41M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
179
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% | 12,795,277 | $39,409,453 | $33,779,531 | -$5,629,922 | -14.29% | |
| State Street Corp | 0.00% | 7,145,550 | $22,008,294 | $18,864,252 | -$3,144,042 | -14.29% | |
| Vanguard Capital Management Llc | 0.00% | 5,658,049 | $17,426,791 | $14,937,249 | -$2,489,542 | -14.29% | |
| Vanguard Portfolio Management Llc | 0.00% | 5,382,002 | $16,576,566 | $14,208,485 | -$2,368,081 | -14.29% | |
| Marshall Wace, Llp | 0.01% | 4,017,901 | $12,375,135 | $10,607,259 | -$1,767,876 | -14.29% | |
| Millennium Management Llc | 0.01% | 3,258,191 | $10,035,228 | $8,601,624 | -$1,433,604 | -14.29% | |
| Geode Capital Management, Llc | 0.00% | 3,107,096 | $9,572,306 | $8,202,733 | -$1,369,573 | -14.31% | |
| Alyeska Investment Group, L.P. | 0.02% | 2,644,600 | $8,145,368 | $6,981,744 | -$1,163,624 | -14.29% | |
| Two Sigma Investments, Lp | 0.01% | 2,478,900 | $7,635,012 | $6,544,296 | -$1,090,716 | -14.29% | |
| Nuveen, Llc | 0.00% | 2,334,601 | $7,190,571 | $6,163,347 | -$1,027,224 | -14.29% | |
| Goldman Sachs Group Inc | 0.00% | 1,350,649 | $4,159,999 | $3,565,713 | -$594,286 | -14.29% | |
| Susquehanna International Group, Llp | 0.01% | 1,325,956 | $4,083,944 | $3,500,524 | -$583,420 | -14.29% | |
| Dimensional Fund Advisors Lp | 0.00% | 1,045,926 | $3,220,757 | $2,761,245 | -$459,512 | -14.27% | |
| Northern Trust Corp | 0.00% | 996,721 | $3,069,900 | $2,631,343 | -$438,557 | -14.29% | |
| Ubs Group Ag | 0.00% | 904,768 | $2,786,685 | $2,388,588 | -$398,097 | -14.29% | |
| Vanguard Fiduciary Trust Co | 0.00% | 869,318 | $2,677,499 | $2,295,000 | -$382,499 | -14.29% | |
| Morgan Stanley | 0.00% | 775,258 | $2,387,794 | $2,046,681 | -$341,113 | -14.29% | |
| D. E. Shaw & Co., Inc. | 0.00% | 727,001 | $2,239,163 | $1,919,283 | -$319,880 | -14.29% | |
| Fmr Llc | 0.00% | 673,964 | $2,075,808 | $1,779,265 | -$296,543 | -14.29% | |
| Tang Capital Management Llc | 0.10% | 666,022 | $2,051,348 | $1,758,298 | -$293,050 | -14.29% | |
| Point72 Asset Management, L.P. | 0.00% | 665,289 | $2,049,090 | $1,756,363 | -$292,727 | -14.29% | |
| Schroder Investment Management Group | 0.00% | 667,837 | $1,923,371 | $1,763,090 | -$160,281 | -8.33% | |
| Bank Of America Corp | 0.00% | 570,203 | $1,756,225 | $1,505,336 | -$250,889 | -14.29% | |
| Citadel Advisors Llc | 0.00% | 448,873 | $1,382,528 | $1,185,025 | -$197,503 | -14.29% | |
| Bnp Paribas Financial Markets | 0.00% | 435,078 | $1,340,040 | $1,148,606 | -$191,434 | -14.29% | |
| Bank Of New York Mellon Corp | 0.00% | 413,503 | $1,273,590 | $1,091,648 | -$181,942 | -14.29% | |
| Beirne Wealth Consulting Services, Llc | 0.36% | 411,858 | $1,268,523 | $1,087,305 | -$181,218 | -14.29% | |
| Charles Schwab Investment Management Inc | 0.00% | 351,681 | $1,083,177 | $928,438 | -$154,739 | -14.29% | |
| Steward Partners Investment Advisory, Llc | 0.00% | 251,781 | $775,485 | $664,702 | -$110,783 | -14.29% | |
| Wellington Management Group Llp | 0.00% | 248,158 | $764,326 | $655,137 | -$109,189 | -14.29% | |
| Mangrove Partners Im, Llc | 0.06% | 239,280 | $736,982 | $631,699 | -$105,283 | -14.29% | |
| Baird Financial Group, Inc. | 0.00% | 237,522 | $731,568 | $627,058 | -$104,510 | -14.29% | |
| Brown Wealth Management, Llc | 0.19% | 236,136 | $727,299 | $623,399 | -$103,900 | -14.29% | |
| Rafferty Asset Management, Llc | 0.00% | 231,271 | $712,315 | $610,555 | -$101,760 | -14.29% | |
| Invesco Ltd. | 0.00% | 227,857 | $701,799 | $601,542 | -$100,257 | -14.29% | |
| Eversource Wealth Advisors, Llc | 0.02% | 7,407 | $647,230 | $19,554 | -$627,676 | -96.98% | |
| Hennion & Walsh Asset Management, Inc. | 0.02% | 201,989 | $622,126 | $533,251 | -$88,875 | -14.29% | |
| Barclays Plc | 0.00% | 192,871 | $594,042 | $509,179 | -$84,863 | -14.29% | |
| Commonwealth Equity Services, Llc | 0.00% | 160,374 | $493,950 | $423,387 | -$70,563 | -14.29% | |
| Knoll Capital Management, Llc | 0.27% | 160,000 | $492,800 | $422,400 | -$70,400 | -14.29% | |
| Rhumbline Advisers | 0.00% | 155,671 | $479,456 | $410,971 | -$68,485 | -14.28% | |
| Hsbc Holdings Plc | 0.00% | 154,365 | $476,216 | $407,524 | -$68,692 | -14.42% | |
| Stifel Financial Corp | 0.00% | 134,616 | $414,617 | $355,386 | -$59,231 | -14.29% | |
| Wealth Effects Llc | 0.14% | 131,950 | $406,406 | $348,348 | -$58,058 | -14.29% | |
| Man Group Plc | 0.00% | 129,846 | $399,926 | $342,793 | -$57,133 | -14.29% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 0.00% | 126,389 | $389,278 | $333,667 | -$55,611 | -14.29% | |
| Deutsche Bank Ag\ | 0.00% | 124,516 | $383,509 | $328,722 | -$54,787 | -14.29% | |
| Engineers Gate Manager Lp | 0.00% | 116,112 | $357,625 | $306,536 | -$51,089 | -14.29% | |
| Jefferies Financial Group Inc. | 0.00% | 110,000 | $338,800 | $290,400 | -$48,400 | -14.29% | |
| Alps Advisors Inc | 0.00% | 105,881 | $326,113 | $279,526 | -$46,587 | -14.29% |
Frequently asked questions about ALT
Who owns the most ALT stock?
The largest holders of ALT are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ALTIMMUNE INC (ALT).
Is ALT widely held by superinvestors?
Many widely followed stocks like ALT appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ALT is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.