ALT · Altimmune, Inc.
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
Superinvestors Holding ALT
All superinvestors →Holder Concentration
Across 211 13F filers · Δ vs Mar 31, 2026Top Holder
13.3%
−4.6 pts
Top 5
45.6%
−3.4 pts
Top 10
66.7%
−1.8 pts
HHI
593
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 |
|---|---|---|---|
| Mega BlackRock, Inc. | +7,590,007 | 20,385,284 | |
| Mega STATE STREET CORP | +4,952,990 | 12,098,540 | |
| Large MARSHALL WACE, LLP | +2,823,154 | 6,841,055 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | +2,519,703 | 8,177,752 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC | +1,948,263 | 7,330,265 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega D. E. Shaw & Co., Inc. | −525,363 | 201,638 | |
| Mega DIMENSIONAL FUND ADVISORS LP | −406,490 | 639,436 | |
| Large Point72 Asset Management, L.P. | −178,405 | 486,884 | |
| Mega TWO SIGMA INVESTMENTS, LP | −97,758 | 2,381,142 | |
| Mega HSBC HOLDINGS PLC | −89,905 | 64,460 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mid Deep Track Capital, LP | 19,250,000 | $58,520,000 | |
| Mid TCG Crossover Management, LLC | 10,000,000 | $30,400,000 | |
| Large VIKING GLOBAL INVESTORS LP | 6,700,000 | $20,368,000 | |
| Large RA CAPITAL MANAGEMENT, L.P. | 6,500,000 | $19,760,000 | |
| Large Woodline Partners LP | 3,400,312 | $10,336,948 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Large Alyeska Investment Group, L.P. | 2,644,600 | $8,145,368 | |
| Mega SCHRODER INVESTMENT MANAGEMENT GROUP | 667,837 | $2,056,937 | |
| Mid Virtu Financial LLC | 70,540 | $217,263 | |
| Mega AMERICAN CENTURY COMPANIES INC | 62,909 | $193,759 | |
| Large ExodusPoint Capital Management, LP | 48,619 | $149,746 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. | $61,971,257 | 13.30% | 20,385,284 | Shares | 2026-08-07 | |
| Mid Deep Track Capital, LP | $58,520,000 | 12.56% | 19,250,000 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP | $36,779,561 | 7.89% | 12,098,540 | Shares | 2026-08-07 | |
| Mid TCG Crossover Management, LLC | $30,400,000 | 6.52% | 10,000,000 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $24,860,366 | 5.34% | 8,177,752 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC | $22,284,005 | 4.78% | 7,330,265 | Shares | 2026-08-13 | |
| Large MARSHALL WACE, LLP | $20,796,806 | 4.46% | 6,841,055 | Shares | 2026-08-13 | |
| Large VIKING GLOBAL INVESTORS LP | $20,368,000 | 4.37% | 6,700,000 | Shares | 2026-08-14 | |
| Large RA CAPITAL MANAGEMENT, L.P. | $19,760,000 | 4.24% | 6,500,000 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | $15,234,394 | 3.27% | 5,011,314 | Shares | 2026-08-12 | |
| Large Woodline Partners LP | $10,336,948 | 2.22% | 3,400,312 | Shares | 2026-08-14 | |
| Mega MILLENNIUM MANAGEMENT LLC | $10,059,730 | 2.16% | 3,309,122 | Shares | 2026-08-14 | |
| Small Trails Edge Capital Partners, LP | $8,086,400 | 1.74% | 2,660,000 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $7,312,275 | 1.57% | 2,405,354 | Shares | 2026-08-11 | |
| Mega TWO SIGMA INVESTMENTS, LP | $7,238,671 | 1.55% | 2,381,142 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC | $6,731,927 | 1.44% | 2,214,450 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $5,469,872 | 1.17% | 1,799,300 | Call | 2026-08-14 | |
| Small GREAT POINT PARTNERS LLC | $5,293,345 | 1.14% | 1,741,232 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $4,861,645 | 1.04% | 1,599,226 | Shares | 2026-08-13 | |
| Mid Weiss Asset Management LP | $4,653,641 | 1.00% | 1,530,803 | Shares | 2026-08-14 | |
| Mid Nantahala Capital Management, LLC | $4,560,000 | 0.98% | 1,500,000 | Shares | 2026-08-19 | |
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $3,930,723 | 0.84% | 1,293,001 | Shares | 2026-08-13 | |
| Mid Cormorant Asset Management, LP | $3,800,000 | 0.82% | 1,250,000 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC | $3,711,682 | 0.80% | 1,220,949 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $2,990,018 | 0.64% | 983,559 | Shares | 2026-08-14 | |
| Mega UBS Group AG | $2,633,808 | 0.57% | 866,385 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY | $2,305,640 | 0.49% | 758,435 | Shares | 2026-08-13 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $2,304,072 | 0.49% | 757,919 | Shares | 2026-08-14 | |
| Mid Ghisallo Capital Management LLC | $2,280,000 | 0.49% | 750,000 | Shares | 2026-08-14 | |
| Mega FMR LLC | $2,276,880 | 0.49% | 748,974 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $2,222,476 | 0.48% | 731,078 | Shares | 2026-08-14 | |
| Mega Bank of New York Mellon Corp Bank | $2,096,726 | 0.45% | 689,713 | Shares | 2026-08-06 | |
| Mid TANG CAPITAL MANAGEMENT LLC | $2,024,706 | 0.43% | 666,022 | Shares | 2026-08-14 | |
| Mega DIMENSIONAL FUND ADVISORS LP | $1,943,884 | 0.42% | 639,436 | Shares | 2026-08-11 | |
| Mega CITADEL ADVISORS LLC | $1,918,240 | 0.41% | 631,000 | Call | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1,898,476 | 0.41% | 624,499 | Shares | 2026-08-14 | |
| Mid Hennion & Walsh Asset Management, Inc. | $1,575,321 | 0.34% | 518,198 | Shares | 2026-07-08 | |
| Large Point72 Asset Management, L.P. | $1,480,127 | 0.32% | 486,884 | Shares | 2026-08-14 | |
| Mid Rock Springs Capital Management LP | $1,433,253 | 0.31% | 471,465 | Shares | 2026-08-14 | |
| Micro Beirne Wealth Consulting Services, LLC | $1,282,448 | 0.28% | 421,858 | Shares | 2026-07-15 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP | $1,277,710 | 0.27% | 420,300 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA | $1,128,375 | 0.24% | 371,176 | Shares | 2026-08-13 | |
| Mega BARCLAYS PLC | $1,068,824 | 0.23% | 351,587 | Shares | 2026-08-14 | |
| Mega Invesco Ltd. | $1,011,079 | 0.22% | 332,592 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $990,128 | 0.21% | 325,700 | Put | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS | $941,202 | 0.20% | 309,606 | Shares | 2026-08-12 | |
| Large Janney Montgomery Scott LLC | $919,934 | 0.20% | 302,610 | Shares | 2026-08-05 | |
| Large LMR Partners LLP | $912,000 | 0.20% | 300,000 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC | $893,601 | 0.19% | 293,948 | Shares | 2026-08-03 | |
| Large Steward Partners Investment Advisory, LLC | $810,679 | 0.17% | 266,671 | Shares | 2026-08-13 | |
| Mid MANGROVE PARTNERS IM, LLC | $727,411 | 0.16% | 239,280 | Shares | 2026-08-14 | |
| Large Baird Financial Group, Inc. | $722,066 | 0.15% | 237,522 | Shares | 2026-08-12 | |
| Micro BROWN WEALTH MANAGEMENT, LLC | $717,853 | 0.15% | 236,136 | Shares | 2026-07-20 | |
| Mega JANE STREET GROUP, LLC | $691,296 | 0.15% | 227,400 | Call | 2026-08-14 | |
| Large Rafferty Asset Management, LLC | $684,182 | 0.15% | 225,060 | Shares | 2026-08-14 | |
| Large Creative Planning | $663,573 | 0.14% | 218,281 | Shares | 2026-08-13 | |
| Mega WELLS FARGO & COMPANY/MN | $660,986 | 0.14% | 217,430 | Shares | 2026-08-14 | |
| Large COMMONWEALTH EQUITY SERVICES, LLC | $652,304 | 0.14% | 214,574 | Shares | 2026-07-29 | |
| Large Squarepoint Ops LLC | $615,235 | 0.13% | 202,380 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $612,979 | 0.13% | 201,638 | Shares | 2026-08-14 | |
| Large ALPS ADVISORS INC | $600,016 | 0.13% | 197,374 | Shares | 2026-07-29 | |
| Mega DEUTSCHE BANK AG\ Bank | $592,841 | 0.13% | 195,014 | Shares | 2026-08-07 | |
| Large STIFEL FINANCIAL CORP | $584,798 | 0.13% | 192,368 | Shares | 2026-08-12 | |
| Mid Jump Financial, LLC | $577,600 | 0.12% | 190,000 | Shares | 2026-08-13 | |
| Large Man Group plc | $528,570 | 0.11% | 173,872 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ | $502,785 | 0.11% | 165,390 | Shares | 2026-08-14 | |
| Small Knoll Capital Management, LLC | $486,400 | 0.10% | 160,000 | Shares | 2026-08-14 | |
| Small Birchview Capital, LP | $464,150 | 0.10% | 152,681 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. | $428,184 | 0.09% | 140,850 | Shares | 2026-08-14 | |
| Mid Brevan Howard Capital Management LP | $397,574 | 0.09% | 130,781 | Shares | 2026-08-14 | |
| Mid XTX Topco Ltd | $389,387 | 0.08% | 128,088 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $389,120 | 0.08% | 128,000 | Put | 2026-08-14 | |
| Small Virtus Investment Advisers, LLC | $381,103 | 0.08% | 125,363 | Shares | 2026-08-11 | |
| Small WEALTH EFFECTS LLC | $372,856 | 0.08% | 122,650 | Shares | 2026-08-06 | |
| Mega LPL Financial LLC | $370,734 | 0.08% | 121,952 | Shares | 2026-08-07 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund | $357,752 | 0.08% | 117,682 | Shares | 2026-08-14 | |
| Large MetLife Investment Management, LLC | $355,242 | 0.08% | 116,856 | Shares | 2026-08-14 | |
| Mid PROFUND ADVISORS LLC | $345,337 | 0.07% | 113,598 | Shares | 2026-08-11 | |
| Large Jefferies Financial Group Inc. | $334,400 | 0.07% | 110,000 | Shares | 2026-08-17 | |
| Mega JPMORGAN CHASE & CO | $324,137 | 0.07% | 106,625 | Shares | 2026-08-12 | |
| Large SILVERCREST ASSET MANAGEMENT GROUP LLC | $314,640 | 0.07% | 103,500 | Shares | 2026-08-14 | |
| Mid Susquehanna Portfolio Strategies, LLC | $314,256 | 0.07% | 103,374 | Shares | 2026-08-14 | |
| Small Summit Financial Wealth Advisors, LLC | $313,995 | 0.07% | 103,288 | Shares | 2026-07-15 | |
| Mid ADAR1 Capital Management, LLC | $312,581 | 0.07% | 102,823 | Shares | 2026-08-14 | |
| Large Mariner, LLC | $307,413 | 0.07% | 101,123 | Shares | 2026-08-13 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | $304,000 | 0.07% | 100,000 | Shares | 2026-08-14 | |
| Mega CANADA PENSION PLAN INVESTMENT BOARD Pension | $265,392 | 0.06% | 87,300 | Shares | 2026-08-14 | |
| Large Grantham, Mayo, Van Otterloo & Co. LLC | $254,864 | 0.05% | 83,837 | Shares | 2026-08-13 | |
| Mega Vanguard Global Advisers, LLC | $228,136 | 0.05% | 75,045 | Shares | 2026-08-13 | |
| Mid KINGSWOOD WEALTH ADVISORS, LLC | $226,480 | 0.05% | 74,500 | Shares | 2026-07-27 | |
| Large RENAISSANCE TECHNOLOGIES LLC | $217,664 | 0.05% | 71,600 | Shares | 2026-08-13 | |
| Mega AMERIPRISE FINANCIAL INC | $208,455 | 0.04% | 68,571 | Shares | 2026-08-14 | |
| Large IEQ CAPITAL, LLC | $203,540 | 0.04% | 66,954 | Shares | 2026-08-11 | |
| Small PVG ASSET MANAGEMENT CORP | $201,004 | 0.04% | 66,120 | Shares | 2026-07-01 | |
| Mega HSBC HOLDINGS PLC | $195,958 | 0.04% | 64,460 | Shares | 2026-08-14 | |
| Mid Leonteq Securities AG Broker-Dealer | $194,560 | 0.04% | 64,000 | Shares | 2026-07-27 | |
| Large Police & Firemen's Retirement System of New Jersey Pension | $178,220 | 0.04% | 58,625 | Shares | 2026-07-23 | |
| Small AXQ CAPITAL, LP | $172,702 | 0.04% | 56,810 | Shares | 2026-08-06 | |
| Mega ENVESTNET ASSET MANAGEMENT INC | $172,498 | 0.04% | 56,743 | Shares | 2026-08-03 | |
| Large Corient Private Wealth LLC | $164,847 | 0.04% | 54,226 | Shares | 2026-08-27 |
Key facts
CIK
1326190
CUSIP
02155H200
13F (30d)
174 filings
174 filers
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