ALTIMMUNE INC ALT
COM NEW · Common Stock · CUSIP 02155H200 · ISIN US02155H2004
American biopharmaceutical company
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersGaithersburg, MD
- Founded1997
- Websitealtimmune.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($223.6k this quarter). Holder counts are more reliable. Shares outstanding: 70.9m as of 2024-03-22, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $10.18. Options: 14 managers hold calls ($21.1m notional), 14 hold puts ($11.6m).
Trends to Q1 2024
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 122 |
| Q4 2022 | 129 |
| Q1 2023 | 134 |
| Q2 2023 | 120 |
| Q3 2023 | 113 |
| Q4 2023 | 143 |
| Q1 2024 | 171 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 72 | 65 |
| Q1 2023 | 89 | 62 |
| Q2 2023 | 68 | 75 |
| Q3 2023 | 43 | 62 |
| Q4 2023 | 91 | 50 |
| Q1 2024 | 108 | 68 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q2 2023 | $2.0m | $997.4k | 0.49 |
| Q3 2023 | $2.1m | $897.6k | 0.42 |
| Q4 2023 | $32.0m | $19.3m | 0.60 |
| Q1 2024 | $21.1m | $11.6m | 0.55 |
Biggest buyers
| STATE STREET CORP | Added | +7.6m |
| MORGAN STANLEY | Added | +4.6m |
| MILLENNIUM MANAGEMENT LLC | Added | +1.4m |
| Portolan Capital Management, LLC | New | +887.3k |
| Rafferty Asset Management, LLC | New | +882.6k |
| READYSTATE ASSET MANAGEMENT LP | New | +825.8k |
| CITIGROUP INC | Added | +735.3k |
| FRED ALGER MANAGEMENT, LLC | Added | +666.9k |
| BANK OF AMERICA CORP /DE/ | Added | +472.9k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. | Added | +436.0k |
Biggest sellers
| AMERIPRISE FINANCIAL INC | Reduced | -2.5m |
| Point72 Asset Management, L.P. | Reduced | -1.2m |
| Nuveen Asset Management, LLC | Reduced | -814.3k |
| Invesco Ltd. | Reduced | -718.4k |
| Timelo Investment Management Inc. | Reduced | -515.0k |
| JANE STREET GROUP, LLC | Reduced | -478.9k |
| VANGUARD GROUP INC | Reduced | -443.2k |
| Lighthouse Investment Partners, LLC | Reduced | -328.4k |
| KENNEDY CAPITAL MANAGEMENT LLC | Sold out | -304.6k |
| GROUP ONE TRADING LLC | Reduced | -238.0k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $6.0m592.1k shares |
| CITADEL ADVISORS LLC | Added | $3.2m315.7k shares |
| JANE STREET GROUP, LLC | Reduced | $2.4m231.4k shares |
| SIMPLEX TRADING, LLC | Reduced | $2.3m227.9k shares |
| IMC-Chicago, LLC | Added | $2.2m215.4k shares |
| GROUP ONE TRADING LLC | Reduced | $2.0m195.8k shares |
| DCF Advisers, LLC | Added | $1.2m121.0k shares |
| JPMORGAN CHASE & CO | New | $1.0m98.6k shares |
| WOLVERINE TRADING, LLC | Reduced | $661.7k65.0k shares |
| Walleye Capital LLC | New | $35.6k3.5k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $2.6m256.8k shares |
| CITADEL ADVISORS LLC | Reduced | $2.5m249.3k shares |
| IMC-Chicago, LLC | Added | $2.4m231.6k shares |
| SIMPLEX TRADING, LLC | Reduced | $1.5m145.8k shares |
| GROUP ONE TRADING LLC | Reduced | $712.6k70.0k shares |
| WOLVERINE TRADING, LLC | Reduced | $473.4k46.5k shares |
| JANE STREET GROUP, LLC | Reduced | $451.0k44.3k shares |
| PEAK6 Investments LLC | New | $305.4k30.0k shares |
| J. Goldman & Co LP | New | $274.9k27.0k shares |
| BARCLAYS PLC | New | $254.5k25.0k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Deep Track Capital, LP 13G · passive investor new · filed 2026-04-30 | 10.0% |
| TCG Crossover GP II, LLC 13G · passive investor new · filed 2026-05-01 | 9.8% |
| BlackRock, Inc. 13G · institution -1.1 pts · filed 2025-07-16 | 7.6% |
| VIKING GLOBAL INVESTORS LP 13G · passive investor new · filed 2026-05-01 | 6.7% |
| RA CAPITAL MANAGEMENT, L.P. 13G · passive investor new · filed 2026-05-01 | 6.5% |
| STATE STREET CORP 13G · institution new · filed 2026-05-12 | 5.5% |
Fell to 5% or below in the last year: TANG CAPITAL MANAGEMENT LLC (0.3%, 2026-05-15), VANGUARD GROUP INC (0.0%, 2026-03-26)
Insider purchases and sales in Q1 2024
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q2 2022 | 1 | $13.4k | 2 | $720.7k | — |
| Q3 2022 | 0 | — | 3 | $1.1m | — |
| Q4 2022 | 0 | — | 1 | $300.2k | — |
| Q1 2023 | 3 | $123.7k | 0 | — | — |
| Q2 2023 | 0 | — | 0 | — | — |
| Q3 2023 | 1 | $864 | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| Q1 2024 | 0 | — | 0 | — | — |
None reported in Q1 2024.
Holders, Q1 2024
| Manager | Shares | Change |
|---|---|---|
| STATE STREET CORP 0.00% of their portfolio | 8.6m $88.0m | Added +7.6m |
| MORGAN STANLEY 0.00% of their portfolio | 6.6m $67.6m | Added +4.6m |
| BlackRock Inc. 0.00% of their portfolio | 4.0m $41.1m | Reduced -2.5k |
| VANGUARD GROUP INC 0.00% of their portfolio | 3.1m $31.9m | Reduced -443.2k |
| TANG CAPITAL MANAGEMENT LLC 2.91% of their portfolio | 2.8m $28.0m | Unchanged |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 1.7m $17.4m | Reduced -2.5m |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 1.6m $16.2m | Added +1.4m |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 1.2m $12.6m | Added +43.3k |
| FRED ALGER MANAGEMENT, LLC 0.05% of their portfolio | 993.5k $10.1m | Added +666.9k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 916.3k $9.3m | Added +183.0k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 913.0k $9.3m | Reduced -814.3k |
| Portolan Capital Management, LLC 0.69% of their portfolio | 887.3k $9.0m | New |
| Rafferty Asset Management, LLC 0.03% of their portfolio | 882.6k $9.0m | New |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 861.4k $8.8m | Added +337.2k |
| READYSTATE ASSET MANAGEMENT LP 0.30% of their portfolio | 825.8k $8.4m | New |
| CITIGROUP INC 0.01% of their portfolio | 742.9k $7.6m | Added +735.3k |
| Knoll Capital Management, LLC 3.59% of their portfolio | 567.2k $5.8m | Added +367.2k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 499.9k $5.1m | Added +472.9k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 494.0k $5.0m | Added +20.1k |
| UBS Group AG 0.00% of their portfolio | 490.0k $5.0m | Added +431.7k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.03% of their portfolio | 470.0k $4.8m | Added +436.0k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.02% of their portfolio | 432.7k $4.4m | Added +325 |
| BBR PARTNERS, LLC 0.29% of their portfolio | 358.5k $3.6m | New |
| D. E. Shaw & Co., Inc. 0.00% of their portfolio | 354.4k $3.6m | Added +64.6k |
| Ensign Peak Advisors, Inc 0.01% of their portfolio | 326.8k $3.3m | Unchanged |
| GROUP ONE TRADING LLC 0.11% of their portfolio | 309.5k $3.2m | Reduced -238.0k |
| Moody Aldrich Partners LLC 0.53% of their portfolio | 307.3k $3.1m | New |
| Timelo Investment Management Inc. 4.64% of their portfolio | 294.1k $3.0m | Reduced -515.0k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 288.3k $2.9m | Added +267.8k |
| GERBER, LLC 2.41% of their portfolio | 281.8k $2.9m | Added +26.0k |
| ARDSLEY ADVISORY PARTNERS LP 0.40% of their portfolio | 275.0k $2.8m | Reduced -66.0k |
| Beirne Wealth Consulting Services, LLC 1.18% of their portfolio | 272.8k $2.8m | Reduced -31.0k |
| Ghost Tree Capital, LLC 0.82% of their portfolio | 250.0k $2.5m | New |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 234.7k $2.4m | Reduced -26.8k |
| Woodline Partners LP 0.02% of their portfolio | 214.2k $2.2m | New |
| Susquehanna Portfolio Strategies, LLC 0.05% of their portfolio | 207.2k $2.1m | Unchanged |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.00% of their portfolio | 190.8k $1.9m | New |
| Bank of New York Mellon Corp 0.00% of their portfolio | 189.7k $1.9m | Reduced -1.9k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 176.9k $1.8m | Reduced -4.7k |
| IMC-Chicago, LLC 0.06% of their portfolio | 165.6k $1.7m | Added +33.9k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 156.9k $1.6m | New |
| Lynwood Capital Management Inc. 9.05% of their portfolio | 150.0k $1.5m | New |
| SIMPLEX TRADING, LLC 0.04% of their portfolio | 146.3k $1.5m | Added +81.1k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 142.7k $1.5m | Unchanged |
| PROFUND ADVISORS LLC 0.05% of their portfolio | 134.8k $1.4m | New |
| RAYMOND JAMES & ASSOCIATES 0.00% of their portfolio | 121.1k $1.2m | New |
| Campbell & CO Investment Adviser LLC 0.10% of their portfolio | 110.2k $1.1m | New |
| Pennant Investors, LP 0.31% of their portfolio | 109.8k $1.1m | Unchanged |
| Swiss National Bank 0.00% of their portfolio | 106.0k $1.1m | New |
| OMERS ADMINISTRATION Corp 0.01% of their portfolio | 104.6k $1.1m | New |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.01% of their portfolio | 103.5k $1.1m | Unchanged |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 101.6k $1.0m | Reduced -478.9k |
| Schonfeld Strategic Advisors LLC 0.01% of their portfolio | 101.4k $1.0m | Reduced -33.6k |
| BARCLAYS PLC 0.00% of their portfolio | 100.4k $1.0m | Added +27.9k |
| DCF Advisers, LLC 0.59% of their portfolio | 96.2k $979.6k | Reduced -19.0k |
| SECTORAL ASSET MANAGEMENT INC 0.37% of their portfolio | 92.2k $939.0k | Reduced -78.6k |
| Jump Financial, LLC 0.02% of their portfolio | 86.2k $877.4k | Added +75.5k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 85.4k $869.5k | Added +4.0k |
| ExodusPoint Capital Management, LP 0.01% of their portfolio | 80.9k $824.0k | New |
| COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio | 79.9k $814.0k | Added +19.2k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 78.7k $800.7k | Added +42.5k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 76.1k $774.4k | New |
| Lighthouse Investment Partners, LLC 0.04% of their portfolio | 70.9k $722.0k | Reduced -328.4k |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 67.2k $684.4k | Added +24.6k |
| Cetera Investment Advisers 0.00% of their portfolio | 65.3k $665.1k | New |
| Skandinaviska Enskilda Banken AB (publ) 0.00% of their portfolio | 62.0k $630.6k | Unchanged |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 60.7k $617.9k | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 58.9k $600.0k | Added +13.7k |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.02% of their portfolio | 56.8k $578.2k | Added +22.5k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 53.7k $547.0k | Added +45.0k |
| LPL Financial LLC 0.00% of their portfolio | 53.4k $543.9k | Added +19.0k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 52.0k $529.7k | Reduced -550 |
| GSA CAPITAL PARTNERS LLP 0.04% of their portfolio | 51.2k $521.0k | Reduced -158.3k |
| BROWN WEALTH MANAGEMENT, LLC 0.21% of their portfolio | 50.0k $509.0k | Reduced -25.0k |
| SEI INVESTMENTS CO 0.00% of their portfolio | 47.1k $479.3k | New |
| Legal & General Group Plc 0.00% of their portfolio | 45.6k $464.4k | Added +41.2k |
| CREDIT SUISSE AG/ 0.00% of their portfolio | 44.6k $454.9k | New |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 44.5k $453.0k | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 43.6k $443.7k | Reduced -17.3k |
| E Fund Management Co., Ltd. 0.03% of their portfolio | 41.7k $424.6k | New |
| NewEdge Advisors, LLC 0.00% of their portfolio | 41.5k $422.0k | Added +31.4k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 39.9k $406.0k | Reduced -52.2k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 39.7k $404.2k | New |
| SG Americas Securities, LLC 0.00% of their portfolio | 39.6k $403.0k | Added +16.1k |
| MML INVESTORS SERVICES, LLC 0.00% of their portfolio | 37.2k $378.0k | Added +7.2k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 36.5k $371.9k | New |
| DANSKE BANK A/S 0.00% of their portfolio | 36.4k $370.2k | First filing |
| GLENMEDE TRUST CO NA 0.00% of their portfolio | 34.9k $355.3k | New |
| Walleye Capital LLC 0.00% of their portfolio | 34.8k $354.4k | Added +11.2k |
| Entropy Technologies, LP 0.04% of their portfolio | 34.5k $351.5k | New |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 34.1k $347.1k | Reduced -27.6k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 32.4k $330.1k | Added +19.7k |
| WOLVERINE TRADING, LLC 0.00% of their portfolio | 31.9k $325.0k | Reduced -31.4k |
| Marex Group Ltd 0.01% of their portfolio | 30.0k $305.4k | New |
| Invesco Ltd. 0.00% of their portfolio | 27.8k $282.6k | Reduced -718.4k |
| Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio | 26.7k $271.5k | New |
| Advisory Services Network, LLC 0.01% of their portfolio | 26.7k $271.3k | Added +26.6k |
| AMERICAN INTERNATIONAL GROUP, INC. 0.00% of their portfolio | 26.6k $270.4k | Added +292 |
| MetLife Investment Management, LLC 0.00% of their portfolio | 26.3k $267.9k | Unchanged |
| AVIVA PLC 0.00% of their portfolio | 23.0k $233.7k | Unchanged |