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 ($121.5k this quarter). Holder counts are more reliable. Shares outstanding: 71.1m as of 2024-11-08, 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 ≈ $7.21. Options: 16 managers hold calls ($23.0m notional), 14 hold puts ($16.1m).
Trends to Q4 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 |
| Q2 2024 | 173 |
| Q3 2024 | 169 |
| Q4 2024 | 182 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q1 2023 | 89 | 62 |
| Q2 2023 | 68 | 75 |
| Q3 2023 | 43 | 62 |
| Q4 2023 | 91 | 50 |
| Q1 2024 | 108 | 68 |
| Q2 2024 | 95 | 86 |
| Q3 2024 | 79 | 71 |
| Q4 2024 | 90 | 68 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2024 | $21.1m | $11.6m | 0.55 |
| Q2 2024 | $12.4m | $8.1m | 0.65 |
| Q3 2024 | $11.8m | $8.5m | 0.72 |
| Q4 2024 | $23.0m | $16.1m | 0.70 |
Biggest buyers
| AMERIPRISE FINANCIAL INC | Added | +1.4m |
| BlackRock, Inc. | Added | +693.2k |
| UBS Group AG | Added | +437.1k |
| CITADEL ADVISORS LLC | Added | +247.5k |
| Focus Partners Wealth | New | +245.1k |
| MILLENNIUM MANAGEMENT LLC | Added | +241.5k |
| Invesco Ltd. | Added | +215.4k |
| GROUP ONE TRADING LLC | Added | +155.7k |
| TWO SIGMA INVESTMENTS, LP | Added | +151.0k |
| Ensign Peak Advisors, Inc | Added | +128.2k |
Biggest sellers
| CAPITAL FUND MANAGEMENT S.A. | Sold out | -726.8k |
| VANGUARD GROUP INC | Reduced | -552.2k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | -426.0k |
| GOLDMAN SACHS GROUP INC | Reduced | -406.7k |
| MORGAN STANLEY | Reduced | -373.8k |
| D. E. Shaw & Co., Inc. | Reduced | -298.2k |
| GSA CAPITAL PARTNERS LLP | Reduced | -256.6k |
| Susquehanna Portfolio Strategies, LLC | Sold out | -207.2k |
| JANE STREET GROUP, LLC | Reduced | -104.0k |
| JPMORGAN CHASE & CO | Reduced | -98.9k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $5.1m704.4k shares |
| GROUP ONE TRADING LLC | Added | $4.0m548.8k shares |
| SIMPLEX TRADING, LLC | Added | $2.8m394.5k shares |
| IMC-Chicago, LLC | Added | $2.3m319.3k shares |
| PEAK6 LLC | First filing | $2.2m300.0k shares |
| CITADEL ADVISORS LLC | Reduced | $1.8m244.3k shares |
| DIADEMA PARTNERS LP | First filing | $1.4m200.0k shares |
| Ikarian Capital, LLC | New | $1.2m165.7k shares |
| JANE STREET GROUP, LLC | Added | $827.7k114.8k shares |
| WOLVERINE TRADING, LLC | Added | $772.3k105.5k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $3.8m533.7k shares |
| IMC-Chicago, LLC | Added | $2.8m389.3k shares |
| CITADEL ADVISORS LLC | Added | $2.6m360.8k shares |
| SIMPLEX TRADING, LLC | Added | $2.0m281.6k shares |
| Ikarian Capital, LLC | New | $1.2m165.7k shares |
| GROUP ONE TRADING LLC | Added | $1.1m156.1k shares |
| PEAK6 LLC | First filing | $901.2k125.0k shares |
| JANE STREET GROUP, LLC | Added | $533.5k74.0k shares |
| WOLVERINE TRADING, LLC | Added | $411.4k56.2k shares |
| BOOTHBAY FUND MANAGEMENT, LLC | New | $344.6k47.8k 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 Q4 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 |
|---|---|---|---|---|---|
| Q1 2023 | 3 | $123.7k | 0 | — | — |
| Q2 2023 | 0 | — | 0 | — | — |
| Q3 2023 | 1 | $864 | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| Q1 2024 | 0 | — | 0 | — | — |
| Q2 2024 | 0 | — | 0 | — | — |
| Q3 2024 | 0 | — | 1 | $110.5k | — |
| Q4 2024 | 0 | — | 0 | — | — |
None reported in Q4 2024.
Holders, Q4 2024
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.00% of their portfolio | 6.2m $44.4m | Added +693.2k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 5.3m $37.9m | Added +1.4m |
| VANGUARD GROUP INC 0.00% of their portfolio | 4.4m $32.0m | Reduced -552.2k |
| STATE STREET CORP 0.00% of their portfolio | 3.5m $25.0m | Added +56.2k |
| TANG CAPITAL MANAGEMENT LLC 1.31% of their portfolio | 2.8m $19.8m | Unchanged |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 1.7m $12.0m | Reduced -9.5k |
| Knoll Capital Management, LLC 5.21% of their portfolio | 1.1m $8.1m | Unchanged |
| Bellevue Group AG 0.13% of their portfolio | 945.4k $6.8m | Added +81.8k |
| MORGAN STANLEY 0.00% of their portfolio | 921.8k $6.6m | Reduced -373.8k |
| UBS Group AG 0.00% of their portfolio | 719.6k $5.2m | Added +437.1k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 675.0k $4.9m | Added +247.5k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 665.9k $4.8m | Added +35.9k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 633.4k $4.6m | Reduced -12.9k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 605.3k $4.4m | Added +151.0k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 526.2k $3.8m | Reduced -406.7k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 500.9k $3.6m | Reduced -426.0k |
| D. E. Shaw & Co., Inc. 0.00% of their portfolio | 459.8k $3.3m | Reduced -298.2k |
| Ensign Peak Advisors, Inc 0.01% of their portfolio | 455.0k $3.3m | Added +128.2k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.00% of their portfolio | 428.3k $3.1m | Reduced -45.5k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 345.6k $2.5m | Added +241.5k |
| IMC-Chicago, LLC 0.06% of their portfolio | 303.5k $2.2m | Reduced -31.1k |
| Beirne Wealth Consulting Services, LLC 0.77% of their portfolio | 294.5k $2.1m | Reduced -8.3k |
| GERBER, LLC 1.48% of their portfolio | 281.8k $2.0m | Unchanged |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 278.6k $2.0m | Reduced -104.0k |
| GROUP ONE TRADING LLC 0.07% of their portfolio | 278.5k $2.0m | Added +155.7k |
| Invesco Ltd. 0.00% of their portfolio | 247.1k $1.8m | Added +215.4k |
| Focus Partners Wealth 0.00% of their portfolio | 245.1k $1.8m | New |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 216.9k $1.6m | Reduced -17.5k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 215.5k $1.6m | Added +88.2k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 211.9k $1.5m | Added +253 |
| Hennion & Walsh Asset Management, Inc. 0.07% of their portfolio | 205.6k $1.5m | Added +31.5k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 205.2k $1.5m | Added +8.0k |
| Balyasny Asset Management L.P. 0.00% of their portfolio | 196.3k $1.4m | Added +16.4k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 186.8k $1.3m | Reduced -1.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 181.9k $1.3m | Added +32.4k |
| SIMPLEX TRADING, LLC 0.04% of their portfolio | 181.2k $1.3m | Added +48.0k |
| EXCHANGE TRADED CONCEPTS, LLC 0.02% of their portfolio | 159.6k $1.2m | Reduced -57.2k |
| Rafferty Asset Management, LLC 0.00% of their portfolio | 157.8k $1.1m | Added +2.0k |
| BARCLAYS PLC 0.00% of their portfolio | 157.5k $1.1m | Added +1.8k |
| Swiss National Bank 0.00% of their portfolio | 139.5k $1.0m | Unchanged |
| CITIGROUP INC 0.00% of their portfolio | 124.7k $899.0k | Added +72.9k |
| MML INVESTORS SERVICES, LLC 0.00% of their portfolio | 109.4k $789.0k | Added +74.9k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 104.9k $756.1k | Reduced -4.3k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.00% of their portfolio | 103.5k $746.2k | Unchanged |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 102.9k $742.2k | Reduced -98.9k |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 100.0k $721.0k | Unchanged |
| Summit Financial Wealth Advisors, LLC 0.13% of their portfolio | 99.5k $640.7k | Added +53.6k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 92.4k $666.1k | Added +13.1k |
| Virtu Financial LLC 0.03% of their portfolio | 86.8k $626.0k | Reduced -22.9k |
| COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio | 86.1k $621.0k | Reduced -3.0k |
| GSA CAPITAL PARTNERS LLP 0.04% of their portfolio | 83.0k $598.0k | Reduced -256.6k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 76.8k $553.9k | Added +21.0k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 71.8k $517.4k | Unchanged |
| Legal & General Group Plc 0.00% of their portfolio | 68.1k $491.0k | Reduced -500 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 66.4k $478.9k | Reduced -542 |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 65.7k $473.7k | Reduced -22.7k |
| MARSHALL WACE, LLP 0.00% of their portfolio | 65.5k $472.4k | New |
| Skandinaviska Enskilda Banken AB (publ) 0.00% of their portfolio | 62.0k $453.9k | Unchanged |
| PEAK6 LLC 0.02% of their portfolio | 61.9k $446.6k | First filing |
| Baird Financial Group, Inc. 0.00% of their portfolio | 59.4k $428.6k | New |
| LPL Financial LLC 0.00% of their portfolio | 58.2k $419.4k | Added +7.7k |
| FMR LLC 0.00% of their portfolio | 56.7k $409.1k | Added +5.7k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 56.5k $407.0k | Added +19.4k |
| BROWN WEALTH MANAGEMENT, LLC 0.13% of their portfolio | 50.0k $360.5k | Reduced -248 |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 48.6k $350.5k | Reduced -24.6k |
| SG Americas Securities, LLC 0.00% of their portfolio | 47.1k $339.0k | Added +12.6k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 46.7k $337.1k | Added +1.5k |
| INTECH INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 46.1k $332.5k | Added +12.4k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 44.7k $322.6k | Added +11.8k |
| MetLife Investment Management, LLC 0.00% of their portfolio | 44.5k $320.7k | Added +2.9k |
| Creative Planning 0.00% of their portfolio | 37.0k $266.8k | Added +18.6k |
| Corebridge Financial, Inc. 0.00% of their portfolio | 35.3k $254.6k | Reduced -2.7k |
| WEALTH EFFECTS LLC 0.08% of their portfolio | 32.9k $236.8k | Reduced -2.2k |
| JANUS HENDERSON GROUP PLC 0.00% of their portfolio | 32.0k $230.9k | Unchanged |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 31.2k $224.9k | Reduced -35.3k |
| KRAEMATON INVESTMENT ADVISORS, INC 0.22% of their portfolio | 30.8k $222.0k | New |
| PROFUND ADVISORS LLC 0.01% of their portfolio | 30.6k $220.3k | Reduced -404 |
| North Star Investment Management Corp. 0.02% of their portfolio | 30.0k $216.3k | Added +15.9k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 28.1k $203.0k | Added +4.2k |
| Steward Partners Investment Advisory, LLC 0.00% of their portfolio | 28.1k $202.2k | Added +7.8k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.00% of their portfolio | 27.6k $199.0k | Unchanged |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.00% of their portfolio | 26.9k $193.9k | Added +4.9k |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 25.7k $185.6k | Reduced -1.2k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 25.7k $185.0k | Reduced -668 |
| Farringdon Capital, Ltd. 0.08% of their portfolio | 25.3k $182.4k | First filing |
| NewEdge Advisors, LLC 0.00% of their portfolio | 25.1k $181.2k | Added +579 |
| Jefferies Financial Group Inc. 0.00% of their portfolio | 25.0k $180.2k | Added +5.0k |
| Marex Group Ltd 0.00% of their portfolio | 25.0k $180.2k | Reduced -25.0k |
| OneDigital Investment Advisors LLC 0.00% of their portfolio | 24.5k $176.5k | New |
| B. Riley Wealth Advisors, Inc. 0.01% of their portfolio | 24.5k $176.3k | Added +1.0k |
| Caitong International Asset Management Co., Ltd 0.17% of their portfolio | 24.3k $175.5k | First filing |
| ProShare Advisors LLC 0.00% of their portfolio | 23.4k $168.5k | Added +9.9k |
| Walleye Capital LLC 0.00% of their portfolio | 22.2k $160.2k | New |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 21.4k $154.6k | Unchanged |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 21.2k $153.2k | Reduced -2.1k |
| TEACHER RETIREMENT SYSTEM OF TEXAS 0.00% of their portfolio | 21.2k $153.0k | Added +3.4k |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 21.0k $151.8k | Added +5.9k |
| ARIZONA STATE RETIREMENT SYSTEM 0.00% of their portfolio | 20.6k $148.2k | Added +141 |
| DEBUSSY CAPITAL MANAGEMENT LP 0.02% of their portfolio | 20.0k $140.0k | Unchanged |
| Integrated Wealth Concepts LLC 0.00% of their portfolio | 19.0k $137.1k | Reduced -981 |