Equibles

ALT

Altimmune, Inc.

Company with tickers: ALT

CIK
1326190
CUSIP
02155H200
Shares Outstanding
194,474,154
Price History Institutional Holders Short Volume Short Interest Fails to Deliver Financials SEC Filings Earnings Calls Insider Trades Congressional Trades
Holders: 166
Total Value: $177,038,437
Total Shares: 57,480,040
Showing 1–100 of 175 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 166 13F filers · Δ vs Dec 31, 2025
Top Holder
22.3%
Jun 2023 → Mar 2026 · range 10.3% – 22.3%
+5.8 pts
Top 5
52.8%
Jun 2023 → Mar 2026 · range 42.5% – 52.8%
+2.6 pts
Top 10
72.3%
Jun 2023 → Mar 2026 · range 59.8% – 72.3%
+6.7 pts
HHI
862
Jun 2023 → Mar 2026 · range 496 – 862
Broadly held +159

Quarterly Activity

vs Dec 31, 2025
New
28
Increased
77
Decreased
37
Sold Out
45
Unchanged
24
Holder count: -17
Institutional value: -16.9%
Shares held: -2.6%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds
Large MARSHALL WACE, LLP +3,095,124 4,017,901
Mega BlackRock, Inc. +3,090,979 12,795,277
Mega MILLENNIUM MANAGEMENT LLC +3,050,808 3,258,191
Mega STATE STREET CORP +2,025,847 7,145,550
Mega TWO SIGMA INVESTMENTS, LP +1,213,217 2,478,900

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds
Mega JANE STREET GROUP, LLC −1,687,450 360,700
Mid TANG CAPITAL MANAGEMENT LLC −1,465,285 666,022
Mega CITADEL ADVISORS LLC −1,357,254 982,373
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP −1,234,561 2,442,356
Small Knoll Capital Management, LLC −961,524 160,000

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD)
Large Alyeska Investment Group, L.P. 2,644,600 $8,145,368
Large Point72 Asset Management, L.P. 665,289 $2,049,090
Mid MANGROVE PARTNERS IM, LLC 239,280 $736,982
Mega AMERICAN CENTURY COMPANIES INC 62,909 $193,759
Mid Kovack Advisors, Inc. 36,250 $111,650

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD)
Mega VANGUARD GROUP INC 8,746,949 $31,576,485
Large TWO SIGMA ADVISERS, LP 793,900 $2,865,979
Mid Sculptor Capital LP 553,400 $1,997,774
Small DIADEMA PARTNERS LP 491,800 $1,775,398
Small Soviero Asset Management, LP 400,000 $1,444,000
100 of 100 shown
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Action
Mega BlackRock, Inc. $39,409,448 22.26% 12,795,277 View
Mega STATE STREET CORP $22,008,294 12.43% 7,145,550 View
Large MARSHALL WACE, LLP $12,375,134 6.99% 4,017,901 View
Mega MILLENNIUM MANAGEMENT LLC $10,035,228 5.67% 3,258,191 View
Mega GEODE CAPITAL MANAGEMENT, LLC $9,569,855 5.41% 3,107,096 View
Large Alyeska Investment Group, L.P. $8,145,368 4.60% 2,644,600 View
Mega TWO SIGMA INVESTMENTS, LP $7,635,012 4.31% 2,478,900 View
Mega Nuveen, LLC $7,190,569 4.06% 2,334,601 View
Mega GOLDMAN SACHS GROUP INC $4,159,998 2.35% 1,350,649 View
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $4,083,944 2.31% 1,325,956 View
Mega DIMENSIONAL FUND ADVISORS LP $3,221,450 1.82% 1,045,926 View
Mega UBS Group AG $2,786,684 1.57% 904,768 View
Mega D. E. Shaw & Co., Inc. $2,239,162 1.26% 727,001 View
Mega FMR LLC $2,075,808 1.17% 673,964 View
Mega SCHRODER INVESTMENT MANAGEMENT GROUP $2,056,937 1.16% 667,837 View
Mid TANG CAPITAL MANAGEMENT LLC $2,051,347 1.16% 666,022 View
Large Point72 Asset Management, L.P. $2,049,090 1.16% 665,289 View
Mega BANK OF AMERICA CORP /DE/ $1,756,224 0.99% 570,203 View
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,729,112 0.98% 561,400 View
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,709,400 0.97% 555,000 View
Mega CITADEL ADVISORS LLC $1,382,528 0.78% 448,873 View
Mega BNP PARIBAS ARBITRAGE, SA $1,340,040 0.76% 435,078 View
Mega Bank of New York Mellon Corp $1,273,587 0.72% 413,503 View
Micro Beirne Wealth Consulting Services, LLC $1,268,522 0.72% 411,858 View
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $1,083,177 0.61% 351,681 View
Mega CITADEL ADVISORS LLC $1,040,732 0.59% 337,900 View
Mega JANE STREET GROUP, LLC $937,244 0.53% 304,300 View
Large Steward Partners Investment Advisory, LLC $775,485 0.44% 251,781 View
Mega WELLINGTON MANAGEMENT GROUP LLP $764,325 0.43% 248,158 View
Mid MANGROVE PARTNERS IM, LLC $736,982 0.42% 239,280 View
Large Baird Financial Group, Inc. $731,567 0.41% 237,522 View
Micro BROWN WEALTH MANAGEMENT, LLC $727,298 0.41% 236,136 View
Large Rafferty Asset Management, LLC $712,314 0.40% 231,271 View
Mega Invesco Ltd. $701,799 0.40% 227,857 View
Mid Hennion & Walsh Asset Management, Inc. $622,126 0.35% 201,989 View
Mega CITADEL ADVISORS LLC $602,448 0.34% 195,600 View
Mega BARCLAYS PLC $594,041 0.34% 192,871 View
Large Janney Montgomery Scott LLC $531,638 0.30% 172,610 View
Large COMMONWEALTH EQUITY SERVICES, LLC $493,951 0.28% 160,374 View
Small Knoll Capital Management, LLC $492,800 0.28% 160,000 View
Mega RHUMBLINE ADVISERS $479,466 0.27% 155,671 View
Mega HSBC HOLDINGS PLC $475,444 0.27% 154,365 View
Large STIFEL FINANCIAL CORP $414,617 0.23% 134,616 View
Small WEALTH EFFECTS LLC $406,406 0.23% 131,950 View
Large Man Group plc $399,925 0.23% 129,846 View
Mega JPMORGAN CHASE & CO $392,691 0.22% 127,498 View
Large Grantham, Mayo, Van Otterloo & Co. LLC $389,278 0.22% 126,389 View
Mega DEUTSCHE BANK AG\ $383,509 0.22% 124,516 View
Mid Engineers Gate Manager LP $357,624 0.20% 116,112 View
Large Jefferies Financial Group Inc. $338,800 0.19% 110,000 View
Large ALPS ADVISORS INC $326,113 0.18% 105,881 View
Mega LPL Financial LLC $319,568 0.18% 103,756 View
Large SILVERCREST ASSET MANAGEMENT GROUP LLC $318,780 0.18% 103,500 View
Mid PROFUND ADVISORS LLC $317,674 0.18% 103,141 View
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $308,000 0.17% 100,000 View
Mega WELLS FARGO & COMPANY/MN $295,392 0.17% 95,907 View
Mega PRICE T ROWE ASSOCIATES INC /MD/ $284,936 0.16% 92,512 View
Mega AQR CAPITAL MANAGEMENT LLC $263,196 0.15% 85,454 View
Mid Brevan Howard Capital Management LP $241,481 0.14% 78,403 View
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. $238,059 0.13% 77,292 View
Mid KINGSWOOD WEALTH ADVISORS, LLC $235,620 0.13% 76,500 View
Mega CITIGROUP INC $235,087 0.13% 76,327 View
Large Caption Management, LLC $229,269 0.13% 74,438 View
Large MetLife Investment Management, LLC $222,416 0.13% 72,213 View
Mega AMERIPRISE FINANCIAL INC $221,661 0.13% 71,968 View
Mega ALLIANCEBERNSTEIN L.P. $221,020 0.12% 71,760 View
Mid Virtu Financial LLC $217,263 0.12% 70,540 View
Mid Leonteq Securities AG $200,200 0.11% 65,000 View
Mega AMERICAN CENTURY COMPANIES INC $193,759 0.11% 62,909 View
Mega JANE STREET GROUP, LLC $173,712 0.10% 56,400 View
Large SG Americas Securities, LLC $171,325 0.10% 55,625 View
Mega RAYMOND JAMES FINANCIAL INC $165,690 0.09% 53,796 View
Mega CANADA PENSION PLAN INVESTMENT BOARD $164,164 0.09% 53,300 View
Small Virtus Investment Advisers, LLC $159,368 0.09% 51,743 View
Small AXQ CAPITAL, LP $147,076 0.08% 47,752 View
Large Rockefeller Capital Management L.P. $142,819 0.08% 46,370 View
Large Creative Planning $120,825 0.07% 39,229 View
Small DCF Advisers, LLC $113,960 0.06% 37,000 View
Mid Kovack Advisors, Inc. $111,650 0.06% 36,250 View
Large Cetera Investment Advisers $109,195 0.06% 35,453 View
Large Police & Firemen's Retirement System of New Jersey $109,133 0.06% 35,433 View
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE $107,070 0.06% 34,763 View
Large MML INVESTORS SERVICES, LLC $106,414 0.06% 34,550 View
Mid INTECH INVESTMENT MANAGEMENT LLC $94,743 0.05% 30,761 View
Large Corient Private Wealth LLC $94,103 0.05% 30,553 View
Mid HUB Investment Partners, LLC $93,071 0.05% 30,218 View
Mid E Fund Management Co., Ltd. $89,541 0.05% 29,072 View
Large BLAIR WILLIAM & CO/IL $86,926 0.05% 28,223 View
Large FARALLON CAPITAL MANAGEMENT LLC $85,008 0.05% 27,600 View
Mid Voleon Capital Management LP $83,597 0.05% 27,142 View
Mid Concurrent Investment Advisors, LLC $81,644 0.05% 26,508 View
Mid JONES FINANCIAL COMPANIES LLLP $79,676 0.05% 25,869 View
Mega ROYAL BANK OF CANADA $77,975 0.04% 25,317 View
Large ProShare Advisors LLC $75,530 0.04% 24,523 View
Small Polymer Capital Management (US) LLC $73,916 0.04% 23,999 View
Mid SIMPLEX TRADING, LLC $70,350 0.04% 22,841 View
Mid China Universal Asset Management Co., Ltd. $68,446 0.04% 22,223 View
Small Scientech Research LLC $67,267 0.04% 21,840 View
Large PRUDENTIAL FINANCIAL INC $67,113 0.04% 21,790 View
Large NEW YORK STATE COMMON RETIREMENT FUND $66,056 0.04% 21,447 View
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