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. Holder counts are more reliable. Shares outstanding: 71.1m as of 2024-08-02, 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 ≈ $6.65. Options: 15 managers hold calls ($12.4m notional), 10 hold puts ($8.1m).
Trends to Q2 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 |
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 |
| Q2 2024 | 95 | 86 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2023 | $2.1m | $897.6k | 0.42 |
| Q4 2023 | $32.0m | $19.3m | 0.60 |
| Q1 2024 | $21.1m | $11.6m | 0.55 |
| Q2 2024 | $12.4m | $8.1m | 0.65 |
Biggest buyers
| VANGUARD GROUP INC | Added | +1.8m |
| AMERIPRISE FINANCIAL INC | Added | +1.5m |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | +1.3m |
| BlackRock Inc. | Added | +1.3m |
| CAPITAL FUND MANAGEMENT S.A. | New | +886.3k |
| Bellevue Group AG | New | +600.0k |
| TWO SIGMA INVESTMENTS, LP | New | +576.6k |
| Knoll Capital Management, LLC | Added | +554.3k |
| GSA CAPITAL PARTNERS LLP | Added | +437.0k |
| JPMORGAN CHASE & CO | Added | +408.6k |
Biggest sellers
| MORGAN STANLEY | Reduced | -5.3m |
| STATE STREET CORP | Reduced | -4.7m |
| MILLENNIUM MANAGEMENT LLC | Reduced | -1.6m |
| FRED ALGER MANAGEMENT, LLC | Sold out | -993.5k |
| CITIGROUP INC | Reduced | -706.5k |
| Rafferty Asset Management, LLC | Reduced | -661.0k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. | Reduced | -442.4k |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Reduced | -345.7k |
| READYSTATE ASSET MANAGEMENT LP | Reduced | -339.1k |
| UBS Group AG | Reduced | -330.4k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $3.3m495.0k shares |
| CITADEL ADVISORS LLC | Reduced | $1.8m266.3k shares |
| IMC-Chicago, LLC | Added | $1.7m248.8k shares |
| SIMPLEX TRADING, LLC | Reduced | $1.5m218.6k shares |
| JANE STREET GROUP, LLC | Reduced | $1.4m210.4k shares |
| GROUP ONE TRADING LLC | Reduced | $1.0m150.6k shares |
| DCF Advisers, LLC | Reduced | $718.2k108.0k shares |
| WOLVERINE TRADING, LLC | Added | $540.6k81.3k shares |
| Hudson Bay Capital Management LP | New | $332.5k50.0k shares |
| Caption Management, LLC | New | $166.2k25.0k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $2.3m340.2k shares |
| IMC-Chicago, LLC | Added | $2.1m315.2k shares |
| SIMPLEX TRADING, LLC | Added | $1.2m184.2k shares |
| CITADEL ADVISORS LLC | Reduced | $975.6k146.7k shares |
| GROUP ONE TRADING LLC | Added | $554.6k83.4k shares |
| WOLVERINE TRADING, LLC | Added | $331.2k49.8k shares |
| JANE STREET GROUP, LLC | Added | $325.9k49.0k shares |
| PEAK6 Investments LLC | Unchanged | $199.5k30.0k shares |
| Walleye Capital LLC | Added | $101.7k15.3k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 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 Q2 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 |
|---|---|---|---|---|---|
| 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 | — | — |
| Q2 2024 | 0 | — | 0 | — | — |
None reported in Q2 2024.
Holders, Q2 2024
| Manager | Shares | Change |
|---|---|---|
| BlackRock Inc. 0.00% of their portfolio | 5.3m $35.4m | Added +1.3m |
| VANGUARD GROUP INC 0.00% of their portfolio | 4.9m $32.6m | Added +1.8m |
| STATE STREET CORP 0.00% of their portfolio | 3.9m $26.0m | Reduced -4.7m |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 3.2m $21.4m | Added +1.5m |
| TANG CAPITAL MANAGEMENT LLC 1.86% of their portfolio | 2.8m $18.3m | Unchanged |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.03% of their portfolio | 2.2m $14.7m | Added +1.3m |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 1.6m $10.6m | Added +357.0k |
| MORGAN STANLEY 0.00% of their portfolio | 1.3m $8.6m | Reduced -5.3m |
| Knoll Capital Management, LLC 5.03% of their portfolio | 1.1m $7.5m | Added +554.3k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 1.0m $6.7m | Added +148.7k |
| CAPITAL FUND MANAGEMENT S.A. 0.07% of their portfolio | 886.3k $5.9m | New |
| D. E. Shaw & Co., Inc. 0.01% of their portfolio | 762.4k $5.1m | Added +408.0k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 665.1k $4.4m | Reduced -247.9k |
| Portolan Capital Management, LLC 0.35% of their portfolio | 640.2k $4.3m | Reduced -247.0k |
| Bellevue Group AG 0.06% of their portfolio | 600.0k $4.0m | New |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 585.5k $3.9m | Added +408.6k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 576.6k $3.8m | New |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 570.2k $3.8m | Added +335.4k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 527.3k $3.5m | Added +33.3k |
| GSA CAPITAL PARTNERS LLP 0.23% of their portfolio | 488.1k $3.2m | Added +437.0k |
| READYSTATE ASSET MANAGEMENT LP 0.15% of their portfolio | 486.7k $3.2m | Reduced -339.1k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.00% of their portfolio | 473.9k $3.2m | Added +283.0k |
| BBR PARTNERS, LLC 0.20% of their portfolio | 374.8k $2.5m | Added +16.3k |
| Ensign Peak Advisors, Inc 0.00% of their portfolio | 326.8k $2.2m | Unchanged |
| IMC-Chicago, LLC 0.06% of their portfolio | 283.3k $1.9m | Added +117.7k |
| GERBER, LLC 1.47% of their portfolio | 281.8k $1.9m | Unchanged |
| Jump Financial, LLC 0.04% of their portfolio | 281.0k $1.9m | Added +194.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 279.3k $1.9m | Reduced -220.5k |
| Beirne Wealth Consulting Services, LLC 0.74% of their portfolio | 277.8k $1.8m | Added +5.0k |
| GROUP ONE TRADING LLC 0.06% of their portfolio | 276.0k $1.8m | Reduced -33.5k |
| SG Americas Securities, LLC 0.01% of their portfolio | 254.6k $1.7m | Added +215.0k |
| ARDSLEY ADVISORY PARTNERS LP 0.30% of their portfolio | 250.0k $1.7m | Reduced -25.0k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 243.8k $1.6m | Added +54.2k |
| Rafferty Asset Management, LLC 0.01% of their portfolio | 221.6k $1.5m | Reduced -661.0k |
| Susquehanna Portfolio Strategies, LLC 0.06% of their portfolio | 207.2k $1.4m | Unchanged |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 206.9k $1.4m | Added +64.1k |
| SIMPLEX TRADING, LLC 0.04% of their portfolio | 166.1k $1.1m | Added +19.8k |
| UBS Group AG 0.00% of their portfolio | 159.6k $1.1m | Reduced -330.4k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 154.7k $1.0m | Reduced -2.2k |
| Swiss National Bank 0.00% of their portfolio | 139.5k $927.7k | Added +33.5k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 136.3k $906.1k | Added +34.7k |
| Hennion & Walsh Asset Management, Inc. 0.04% of their portfolio | 129.3k $859.7k | New |
| EXCHANGE TRADED CONCEPTS, LLC 0.02% of their portfolio | 124.3k $826.3k | New |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 124.1k $825.5k | Reduced -164.1k |
| Pennant Investors, LP 0.20% of their portfolio | 109.8k $730.2k | Unchanged |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 107.4k $714.5k | Added +22.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 105.2k $699.5k | Added +87.0k |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 103.6k $689.0k | New |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.00% of their portfolio | 103.5k $688.3k | Unchanged |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 100.0k $665.0k | Added +55.5k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 95.5k $635.3k | Added +43.5k |
| COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio | 87.1k $579.0k | Added +7.2k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.00% of their portfolio | 86.9k $578.2k | Reduced -345.7k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 84.8k $563.7k | Added +25.8k |
| BARCLAYS PLC 0.00% of their portfolio | 80.7k $536.5k | Reduced -19.7k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 69.4k $461.6k | Added +15.7k |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 69.4k $461.5k | New |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 69.4k $461.5k | Added +29.7k |
| Legal & General Group Plc 0.00% of their portfolio | 62.2k $413.5k | Added +16.6k |
| Skandinaviska Enskilda Banken AB (publ) 0.00% of their portfolio | 62.0k $412.0k | Unchanged |
| ALPS ADVISORS INC 0.00% of their portfolio | 55.3k $367.8k | New |
| Marex Group Ltd 0.01% of their portfolio | 52.0k $345.8k | Added +22.0k |
| LPL Financial LLC 0.00% of their portfolio | 51.7k $343.6k | Reduced -1.8k |
| BROWN WEALTH MANAGEMENT, LLC 0.13% of their portfolio | 50.0k $332.5k | Unchanged |
| Campbell & CO Investment Adviser LLC 0.03% of their portfolio | 49.5k $329.1k | Reduced -60.7k |
| MML INVESTORS SERVICES, LLC 0.00% of their portfolio | 47.7k $317.0k | Added +10.6k |
| DCF Advisers, LLC 0.15% of their portfolio | 42.9k $285.1k | Reduced -53.4k |
| MetLife Investment Management, LLC 0.00% of their portfolio | 41.6k $276.5k | Added +15.3k |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 41.4k $275.2k | Reduced -19.3k |
| PROFUND ADVISORS LLC 0.01% of their portfolio | 40.8k $271.1k | Reduced -94.1k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 40.4k $268.9k | Reduced -3.2k |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.01% of their portfolio | 40.0k $266.0k | Reduced -16.8k |
| Corebridge Financial, Inc. 0.00% of their portfolio | 38.2k $254.1k | First filing |
| WEALTH EFFECTS LLC 0.09% of their portfolio | 37.5k $249.7k | Added +22.9k |
| CITIGROUP INC 0.00% of their portfolio | 36.4k $242.0k | Reduced -706.5k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 36.0k $237.2k | First filing |
| Trexquant Investment LP 0.00% of their portfolio | 35.1k $233.5k | New |
| Brevan Howard Capital Management LP 0.01% of their portfolio | 32.5k $215.8k | New |
| JANUS HENDERSON GROUP PLC 0.00% of their portfolio | 32.0k $212.5k | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 31.0k $205.0k | Reduced -8.9k |
| Invesco Ltd. 0.00% of their portfolio | 30.7k $204.4k | Added +3.0k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 27.8k $185.0k | Reduced -8.7k |
| Summit Financial Wealth Advisors, LLC 0.04% of their portfolio | 27.8k $184.9k | New |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.00% of their portfolio | 27.6k $183.5k | Reduced -442.4k |
| WOLVERINE TRADING, LLC 0.00% of their portfolio | 27.4k $182.4k | Reduced -4.5k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 27.0k $179.4k | Added +6.3k |
| Entropy Technologies, LP 0.02% of their portfolio | 24.6k $163.8k | Reduced -9.9k |
| PVG ASSET MANAGEMENT CORP 0.61% of their portfolio | 23.1k $153.8k | First filing |
| Walleye Capital LLC 0.00% of their portfolio | 23.0k $152.9k | Reduced -11.8k |
| AVIVA PLC 0.00% of their portfolio | 23.0k $152.6k | Unchanged |
| NewEdge Advisors, LLC 0.00% of their portfolio | 22.9k $152.5k | Reduced -18.5k |
| Schonfeld Strategic Advisors LLC 0.00% of their portfolio | 22.7k $151.2k | Reduced -78.7k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 22.7k $151.0k | Added +7.4k |
| RAYMOND JAMES & ASSOCIATES 0.00% of their portfolio | 22.0k $146.2k | Reduced -99.1k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 21.4k $142.6k | Added +104 |
| Independent Advisor Alliance 0.00% of their portfolio | 21.2k $141.0k | Reduced -800 |
| B. Riley Wealth Advisors, Inc. 0.00% of their portfolio | 20.8k $138.1k | New |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 20.6k $136.9k | Added +9.9k |
| Jefferies Financial Group Inc. 0.00% of their portfolio | 20.0k $133.0k | New |
| DEBUSSY CAPITAL MANAGEMENT LP 0.04% of their portfolio | 20.0k $133.0k | New |