Altimmune, Inc. (ALT) — Institutional Holders, Q2 2026
211 institutional investment managers reported a ALT position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $456.2M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
ALT in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- Deep Track CapitalNew · +19,250,000 sh+$58.5M
- TCG Crossover ManagementNew · +10,000,000 sh+$30.4M
- BlackRockAdded · +7,590,007 sh+$23.1M
- VIKING GLOBAL INVESTORSNew · +6,700,000 sh+$20.4M
- RA CAPITAL MANAGEMENT, L.P.New · +6,500,000 sh+$19.8M
Biggest sellers
- Alyeska Investment Group, L.P.Sold out · -2,644,600 sh-$8.0M
- SCHRODER INVESTMENT MANAGEMENT GROUPSold out · -667,837 sh-$2.0M
- SUSQUEHANNA INTERNATIONAL GROUP, LLPTrimmed · -594,878 sh-$1.8M
- D. E. ShawTrimmed · -525,363 sh-$1.6M
- DIMENSIONAL FUND ADVISORSTrimmed · -406,490 sh-$1.2M
ALT 13F holders ranked 1–100 of 211
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | BlackRock#1 · 20,385,284 sh | 20,385,284 | $62.0M | <0.01% | +59.3% |
| 2 | Deep Track Capital#2 · 19,250,000 sh | 19,250,000 | $58.5M | 0.85% | New |
| 3 | STATE STREET#3 · 12,098,540 sh | 12,098,540 | $36.8M | <0.01% | +69.3% |
| 4 | TCG Crossover Management#4 · 10,000,000 sh | 10,000,000 | $30.4M | 0.73% | New |
| 5 | VANGUARD CAPITAL MANAGEMENT#5 · 8,177,752 sh | 8,177,752 | $24.9M | <0.01% | +44.5% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT#6 · 7,330,265 sh | 7,330,265 | $22.3M | <0.01% | +36.2% |
| 7 | MARSHALL WACE, LLP#7 · 6,841,055 sh | 6,841,055 | $20.8M | 0.02% | +70.3% |
| 8 | VIKING GLOBAL INVESTORS#8 · 6,700,000 sh | 6,700,000 | $20.4M | 0.06% | New |
| 9 | RA CAPITAL MANAGEMENT, L.P.#9 · 6,500,000 sh | 6,500,000 | $19.8M | 0.17% | New |
| 10 | GEODE CAPITAL MANAGEMENT#10 · 5,011,314 sh | 5,011,314 | $15.2M | <0.01% | +61.3% |
| 11 | Woodline Partners#11 · 3,400,312 sh | 3,400,312 | $10.3M | 0.03% | New |
| 12 | MILLENNIUM MANAGEMENT#12 · 3,309,122 sh | 3,309,122 | $10.1M | <0.01% | +1.6% |
| 13 | Trails Edge Capital Partners#13 · 2,660,000 sh | 2,660,000 | $8.1M | 1.28% | New |
| 14 | Nuveen#14 · 2,405,354 sh | 2,405,354 | $7.3M | <0.01% | +3.0% |
| 15 | TWO SIGMA INVESTMENTS#15 · 2,381,142 sh | 2,381,142 | $7.2M | <0.01% | -3.9% |
| 16 | GOLDMAN SACHS GROUP#16 · 2,214,450 sh | 2,214,450 | $6.7M | <0.01% | +64.0% |
| 17 | GREAT POINT PARTNERS#17 · 1,741,232 sh | 1,741,232 | $5.3M | 1.00% | New |
| 18 | NORTHERN#18 · 1,599,226 sh | 1,599,226 | $4.9M | <0.01% | +60.4% |
| 19 | Weiss Asset Management#19 · 1,530,803 sh | 1,530,803 | $4.7M | 0.05% | New |
| 20 | Nantahala Capital Management#20 · 1,500,000 sh | 1,500,000 | $4.6M | 0.15% | New |
| 21 | VANGUARD FIDUCIARY#21 · 1,293,001 sh | 1,293,001 | $3.9M | <0.01% | +48.7% |
| 22 | Cormorant Asset Management#22 · 1,250,000 sh | 1,250,000 | $3.8M | 0.19% | New |
| 23 | AQR CAPITAL MANAGEMENT#23 · 1,220,949 sh | 1,220,949 | $3.7M | <0.01% | +1328.8% |
| 24 | CITADEL ADVISORS#24 · 983,559 sh | 983,559 | $3.0M | <0.01% | +119.1% |
| 25 | UBS Group AG#25 · 866,385 sh | 866,385 | $2.6M | <0.01% | -4.2% |
| 26 | MORGAN STANLEY#26 · 758,435 sh | 758,435 | $2.3M | <0.01% | -2.2% |
| 27 | BANK OF AMERICA#27 · 757,919 sh | 757,919 | $2.3M | <0.01% | +32.9% |
| 28 | Ghisallo Capital Management#28 · 750,000 sh | 750,000 | $2.3M | 0.04% | New |
| 29 | FMR#29 · 748,974 sh | 748,974 | $2.3M | <0.01% | +11.1% |
| 30 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#30 · 731,078 sh | 731,078 | $2.2M | <0.01% | -44.9% |
| 31 | Bank of New York Mellon#31 · 689,713 sh | 689,713 | $2.1M | <0.01% | +66.8% |
| 32 | TANG CAPITAL MANAGEMENT#32 · 666,022 sh | 666,022 | $2.0M | 0.09% | 0.0% |
| 33 | DIMENSIONAL FUND ADVISORS#33 · 639,436 sh | 639,436 | $1.9M | <0.01% | -38.9% |
| 34 | CHARLES SCHWAB INVESTMENT MANAGEMENT#34 · 624,499 sh | 624,499 | $1.9M | <0.01% | +77.6% |
| 35 | Hennion & Walsh Asset Management#35 · 518,198 sh | 518,198 | $1.6M | — | +156.5% |
| 36 | Point72 Asset Management, L.P.#36 · 486,884 sh | 486,884 | $1.5M | <0.01% | -26.8% |
| 37 | Rock Springs Capital Management#37 · 471,465 sh | 471,465 | $1.4M | 0.07% | New |
| 38 | Beirne Wealth Consulting Services#38 · 421,858 sh | 421,858 | $1.3M | — | +2.4% |
| 39 | WELLINGTON MANAGEMENT GROUP LLP#39 · 420,300 sh | 420,300 | $1.3M | <0.01% | +69.4% |
| 40 | BNP PARIBAS FINANCIAL MARKETS#40 · 371,176 sh | 371,176 | $1.1M | <0.01% | -14.7% |
| 41 | BARCLAYS PLC#41 · 351,587 sh | 351,587 | $1.1M | <0.01% | +82.3% |
| 42 | Invesco Ltd.#42 · 332,592 sh | 332,592 | $1.0M | <0.01% | +46.0% |
| 43 | RHUMBLINE ADVISERS#43 · 309,606 sh | 309,606 | $941.2K | <0.01% | +98.9% |
| 44 | Janney Montgomery Scott#44 · 302,610 sh | 302,610 | $920.0K | <0.01% | +75.3% |
| 45 | LMR Partners LLP#45 · 300,000 sh | 300,000 | $912.0K | <0.01% | New |
| 46 | CITIGROUP#46 · 293,948 sh | 293,948 | $893.6K | <0.01% | +285.1% |
| 47 | Steward Partners Investment Advisory#47 · 266,671 sh | 266,671 | $810.7K | <0.01% | +5.9% |
| 48 | MANGROVE PARTNERS IM#48 · 239,280 sh | 239,280 | $727.4K | 0.05% | 0.0% |
| 49 | Baird Financial Group#49 · 237,522 sh | 237,522 | $722.1K | <0.01% | 0.0% |
| 50 | BROWN WEALTH MANAGEMENT#50 · 236,136 sh | 236,136 | $717.9K | — | 0.0% |
| 51 | Rafferty Asset Management#51 · 225,060 sh | 225,060 | $684.2K | <0.01% | -2.7% |
| 52 | Creative Planning#52 · 218,281 sh | 218,281 | $663.6K | <0.01% | +456.4% |
| 53 | WELLS FARGO & COMPANY#53 · 217,430 sh | 217,430 | $661.0K | <0.01% | +126.7% |
| 54 | COMMONWEALTH EQUITY SERVICES#54 · 214,574 sh | 214,574 | $652.3K | <0.01% | +33.8% |
| 55 | Squarepoint Ops#55 · 202,380 sh | 202,380 | $615.2K | <0.01% | +1016.5% |
| 56 | D. E. Shaw#56 · 201,638 sh | 201,638 | $613.0K | <0.01% | -72.3% |
| 57 | ALPS ADVISORS#57 · 197,374 sh | 197,374 | $600.0K | <0.01% | +86.4% |
| 58 | DEUTSCHE BANK AG\#58 · 195,014 sh | 195,014 | $592.8K | <0.01% | +56.6% |
| 59 | STIFEL FINANCIAL#59 · 192,368 sh | 192,368 | $584.8K | <0.01% | +42.9% |
| 60 | Jump Financial#60 · 190,000 sh | 190,000 | $577.6K | <0.01% | New |
| 61 | Man Group plc#61 · 173,872 sh | 173,872 | $528.6K | <0.01% | +33.9% |
| 62 | PRICE T ROWE ASSOCIATES#62 · 165,390 sh | 165,390 | $503.0K | <0.01% | +78.8% |
| 63 | Knoll Capital Management#63 · 160,000 sh | 160,000 | $486.4K | 0.27% | 0.0% |
| 64 | Birchview Capital#64 · 152,681 sh | 152,681 | $464.1K | 0.22% | New |
| 65 | ALLIANCEBERNSTEIN L.P.#65 · 140,850 sh | 140,850 | $433.8K | <0.01% | +96.3% |
| 66 | Brevan Howard Capital Management#66 · 130,781 sh | 130,781 | $397.6K | <0.01% | +66.8% |
| 67 | XTX Topco Ltd#67 · 128,088 sh | 128,088 | $389.4K | <0.01% | New |
| 68 | Virtus Investment Advisers#68 · 125,363 sh | 125,363 | $381.1K | 0.09% | +142.3% |
| 69 | WEALTH EFFECTS#69 · 122,650 sh | 122,650 | $372.9K | — | -7.0% |
| 70 | LPL Financial#70 · 121,952 sh | 121,952 | $370.7K | <0.01% | +17.5% |
| 71 | MetLife Investment Management#71 · 116,856 sh | 116,856 | $355.2K | <0.01% | +61.8% |
| 72 | MIRAE ASSET GLOBAL ETFS Ltd.#72 · 117,682 sh | 117,682 | $355.1K | <0.01% | +52.3% |
| 73 | PROFUND ADVISORS#73 · 113,598 sh | 113,598 | $345.3K | <0.01% | +10.1% |
| 74 | LEUCADIA NATIONAL#74 · 110,000 sh | 110,000 | $334.4K | <0.01% | 0.0% |
| 75 | SILVERCREST ASSET MANAGEMENT GROUP#75 · 103,500 sh | 103,500 | $314.6K | <0.01% | 0.0% |
| 76 | Susquehanna Portfolio Strategies#76 · 103,374 sh | 103,374 | $314.3K | <0.01% | New |
| 77 | Summit Financial Wealth Advisors#77 · 103,288 sh | 103,288 | $314.0K | — | 0.0% |
| 78 | JPMORGAN CHASE#78 · 106,625 sh | 106,625 | $313.5K | 0.00% | -16.4% |
| 79 | ADAR1 Capital Management#79 · 102,823 sh | 102,823 | $312.6K | 0.01% | New |
| 80 | Mariner#80 · 101,123 sh | 101,123 | $307.4K | <0.01% | New |
| 81 | NOMURA ASSET MANAGEMENT INTERNATIONAL#81 · 100,000 sh | 100,000 | $304.0K | <0.01% | 0.0% |
| 82 | CANADA PENSION PLAN INVESTMENT BOARD#82 · 87,300 sh | 87,300 | $265.4K | <0.01% | +63.8% |
| 83 | Grantham, Mayo, Van Otterloo#83 · 83,837 sh | 83,837 | $254.9K | <0.01% | -33.7% |
| 84 | Vanguard Global Advisers#84 · 75,045 sh | 75,045 | $228.1K | <0.01% | +75.2% |
| 85 | KINGSWOOD WEALTH ADVISORS#85 · 74,500 sh | 74,500 | $226.5K | — | -2.6% |
| 86 | RENAISSANCE TECHNOLOGIES#86 · 71,600 sh | 71,600 | $217.7K | <0.01% | New |
| 87 | AMERIPRISE FINANCIAL#87 · 68,571 sh | 68,571 | $208.5K | 0.00% | -4.7% |
| 88 | IEQ CAPITAL#88 · 66,954 sh | 66,954 | $203.5K | <0.01% | New |
| 89 | PVG ASSET MANAGEMENT#89 · 66,120 sh | 66,120 | $201.0K | — | 0.0% |
| 90 | HSBC PLC#90 · 64,460 sh | 64,460 | $199.5K | <0.01% | -58.2% |
| 91 | Leonteq Securities AG#91 · 64,000 sh | 64,000 | $194.6K | <0.01% | -1.5% |
| 92 | Police & Firemen's Retirement System of New Jersey#92 · 58,625 sh | 58,625 | $178.2K | <0.01% | +65.5% |
| 93 | AXQ CAPITAL#93 · 56,810 sh | 56,810 | $172.7K | 0.02% | +19.0% |
| 94 | ENVESTNET ASSET MANAGEMENT#94 · 56,743 sh | 56,743 | $172.5K | 0.00% | New |
| 95 | Corient Private Wealth#95 · 54,226 sh | 54,226 | $164.8K | <0.01% | +77.5% |
| 96 | MERCER GLOBAL ADVISORS#96 · 53,115 sh | 53,115 | $161.5K | <0.01% | New |
| 97 | NEW YORK STATE COMMON RETIREMENT FUND#97 · 52,747 sh | 52,747 | $160.4K | <0.01% | +145.9% |
| 98 | MANUFACTURERS LIFE INSURANCE COMPANY, THE#98 · 52,036 sh | 52,036 | $158.2K | <0.01% | +49.7% |
| 99 | Cetera Investment Advisers#99 · 51,901 sh | 51,901 | $157.8K | <0.01% | +46.4% |
| 100 | Rockefeller Capital Management L.P.#100 · 49,740 sh | 49,740 | $151.2K | <0.01% | +7.3% |
Funds that sold out of ALT in Q2 2026 (18)
Held ALT at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Alyeska Investment Group, L.P.2,644,600 sh | 2,644,600 | $8.1M |
| SCHRODER INVESTMENT MANAGEMENT GROUP667,837 sh | 667,837 | $1.9M |
| Virtu Financial70,540 sh | 70,540 | $217.0K |
| AMERICAN CENTURY COMPANIES62,909 sh | 62,909 | $193.8K |
| ExodusPoint Capital Management48,619 sh | 48,619 | $149.7K |
| FARALLON CAPITAL MANAGEMENT27,600 sh | 27,600 | $85.0K |
| SIMPLEX TRADING22,841 sh | 22,841 | $70.3K |
| Scientech Research21,840 sh | 21,840 | $67.3K |
| Keudell/Morrison Wealth Management18,500 sh | 18,500 | $57.0K |
| NINE MASTS CAPITAL Ltd11,850 sh | 11,850 | $36.5K |
| Quantinno Capital Management10,636 sh | 10,636 | $32.8K |
| IMC-Chicago10,004 sh | 10,004 | $30.8K |
| ACADIAN ASSET MANAGEMENT7,311 sh | 7,311 | $22.0K |
| GROUP ONE TRADING, L.P.6,695 sh | 6,695 | $20.6K |
| US BANCORP \DE\890 sh | 890 | $2.7K |
| Legacy Wealth Managment250 sh | 250 | $770.00 |
| MAI Capital Management150 sh | 150 | $462.00 |
| Larson Financial Group5 sh | 5 | $15.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.