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25% of the shares vesting September 16, 2026, with the remainder vesting in equal annual installments for the following three (3) years, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":96000,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":96000},"source":{"system":"sec-edgar","filing":"0001104659-25-090867","document":"tm2526275-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925090867/tm2526275-2_4seq1.xml","form_type":"4"}},{"id":1037525,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":75241,"kind":"person","name":"Richardson Linda M","position":1,"cik":"0001595064","reported_name":"Richardson Linda 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shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). 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These shares were purchased in multiple transactions at prices ranging from $5.1950 to $5.1997, inclusive. The reporting person undertakes to provide to Altimmune, Inc., any security holder of Altimmune, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."}],"balance_after":10000,"source":{"system":"sec-edgar","filing":"0001104659-25-023724","document":"tm259169-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925023724/tm259169-1_4seq1.xml","form_type":"4"}},{"id":1211956,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":76963,"kind":"person","name":"Harris Matthew Scott","position":1,"cik":"0001787762","reported_name":"Harris Matthew Scott","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock, par value $0.0001","published_at":"2025-03-11T20:05:11.000Z","date":"2025-03-07","kind":"gift","planned":false,"acquired":false,"shares":67787,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F1","text":"On March 7, 2025, the reporting person transferred 67,787 shares of common stock to the Matthew Scott Harris Trust for no consideration. 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