{"transactions":[{"id":1076153,"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":"2025-08-04T20:05:50.000Z","date":"2025-07-31","kind":"grant","planned":false,"acquired":true,"shares":2018,"price":3.14,"value":6336.52,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation of the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from February 1, 2025 through July 31, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock."}],"balance_after":16087,"source":{"system":"sec-edgar","filing":"0001104659-25-073627","document":"tm2522384-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925073627/tm2522384-2_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. The reporting person is trustee of the trust, and the reporting person and members of his immediate family are the sole beneficiaries of the trust. The reporting person remains the beneficial owner of the securities held by the trust."}],"balance_after":14069,"source":{"system":"sec-edgar","filing":"0001104659-25-022550","document":"tm258873-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925022550/tm258873-1_4seq1.xml","form_type":"4"}},{"id":1287226,"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":"Restricted Stock Units","published_at":"2025-02-04T01:48:13.000Z","date":"2025-02-02","kind":"exercise","planned":false,"acquired":true,"shares":7775,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The RSUs vest in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The RSUs vest in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":7775,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":7775},"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287225,"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":"Restricted Stock Units","published_at":"2025-02-04T01:48:13.000Z","date":"2025-02-01","kind":"exercise","planned":false,"acquired":true,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs vest in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The RSUs vest in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":6166},"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287224,"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":"Restricted Stock Units","published_at":"2025-02-04T01:48:13.000Z","date":"2025-01-30","kind":"exercise","planned":false,"acquired":true,"shares":9275,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 30, 2023, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 30, 2023, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":18550,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":9275},"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287223,"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":"2025-02-04T01:48:13.000Z","date":"2025-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":2708,"price":6.64,"value":17981.12,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":81856,"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287222,"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":"2025-02-04T01:48:13.000Z","date":"2025-02-02","kind":"exercise","planned":false,"acquired":true,"shares":7775,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":84564,"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287221,"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":"2025-02-04T01:48:13.000Z","date":"2025-02-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":2109,"price":6.64,"value":14003.76,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":76789,"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287220,"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":"2025-02-04T01:48:13.000Z","date":"2025-02-01","kind":"exercise","planned":false,"acquired":true,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":78898,"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287219,"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":"2025-02-04T01:48:13.000Z","date":"2025-01-31","kind":"grant","planned":false,"acquired":true,"shares":1905,"price":5.18,"value":9867.9,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from August 1, 2024 through January 31, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on August 1, 2024."}],"balance_after":72732,"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287218,"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":"2025-02-04T01:48:13.000Z","date":"2025-01-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":3173,"price":7,"value":22211.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":70827,"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1287217,"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":"2025-02-04T01:48:13.000Z","date":"2025-01-30","kind":"exercise","planned":false,"acquired":true,"shares":9275,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":74000,"source":{"system":"sec-edgar","filing":"0001104659-25-008772","document":"tm255357-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925008772/tm255357-3_4seq1.xml","form_type":"4"}},{"id":1292945,"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":"Restricted Stock Units","published_at":"2025-01-29T02:05:20.000Z","date":"2025-01-27","kind":"grant","planned":false,"acquired":true,"shares":63400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 27, 2025, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 27, 2025, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":63400,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":63400},"source":{"system":"sec-edgar","filing":"0001104659-25-006841","document":"tm254755-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925006841/tm254755-2_4seq1.xml","form_type":"4"}},{"id":1292944,"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":"Stock Options (option to buy)","published_at":"2025-01-29T02:05:20.000Z","date":"2025-01-27","kind":"grant","planned":false,"acquired":true,"shares":183600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Twenty-five percent of the shares underlying the option become vested and released on January 27, 2026 and the remaining 75% of the shares underlying the option become vested and released in substantially equal monthly installments over the 36 months following January 27, 2026, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":183600,"derivative":{"exercise_price":7,"expiration_date":"2035-01-27","underlying":"Common Stock, par value $0.0001","underlying_shares":183600},"source":{"system":"sec-edgar","filing":"0001104659-25-006841","document":"tm254755-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925006841/tm254755-2_4seq1.xml","form_type":"4"}},{"id":1292943,"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":"Restricted Stock Units","published_at":"2025-01-29T02:05:20.000Z","date":"2025-01-25","kind":"exercise","planned":false,"acquired":true,"shares":14600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 25, 2024, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 25, 2024, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":43800,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":14600},"source":{"system":"sec-edgar","filing":"0001104659-25-006841","document":"tm254755-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925006841/tm254755-2_4seq1.xml","form_type":"4"}},{"id":1292942,"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":"2025-01-29T02:05:20.000Z","date":"2025-01-25","kind":"tax_withholding","planned":false,"acquired":false,"shares":4994,"price":6.98,"value":34858.12,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":64725,"source":{"system":"sec-edgar","filing":"0001104659-25-006841","document":"tm254755-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925006841/tm254755-2_4seq1.xml","form_type":"4"}},{"id":1292941,"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":"2025-01-29T02:05:20.000Z","date":"2025-01-25","kind":"exercise","planned":false,"acquired":true,"shares":14600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":69719,"source":{"system":"sec-edgar","filing":"0001104659-25-006841","document":"tm254755-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465925006841/tm254755-2_4seq1.xml","form_type":"4"}},{"id":1444212,"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":"2024-08-01T21:40:41.000Z","date":"2024-07-31","kind":"grant","planned":false,"acquired":true,"shares":1486,"price":5.41,"value":8039.26,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from February 1, 2024 through July 31, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on July 31, 2024."}],"balance_after":55119,"source":{"system":"sec-edgar","filing":"0001104659-24-084991","document":"tm2420669-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924084991/tm2420669-1_4seq1.xml","form_type":"4"}},{"id":1658575,"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":"Restricted Stock Units","published_at":"2024-02-05T23:01:30.000Z","date":"2024-02-02","kind":"exercise","planned":false,"acquired":false,"shares":7775,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":15550,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":7775},"source":{"system":"sec-edgar","filing":"0001104659-24-010779","document":"tm245213-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924010779/tm245213-2_4seq1.xml","form_type":"4"}},{"id":1658574,"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":"Restricted Stock Units","published_at":"2024-02-05T23:01:30.000Z","date":"2024-02-01","kind":"exercise","planned":false,"acquired":false,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":6166,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":6166},"source":{"system":"sec-edgar","filing":"0001104659-24-010779","document":"tm245213-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924010779/tm245213-2_4seq1.xml","form_type":"4"}},{"id":1658573,"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":"2024-02-05T23:01:30.000Z","date":"2024-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":2332,"price":9.32,"value":21734.24,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":53633,"source":{"system":"sec-edgar","filing":"0001104659-24-010779","document":"tm245213-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924010779/tm245213-2_4seq1.xml","form_type":"4"}},{"id":1658572,"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":"2024-02-05T23:01:30.000Z","date":"2024-02-02","kind":"exercise","planned":false,"acquired":true,"shares":7775,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":55965,"source":{"system":"sec-edgar","filing":"0001104659-24-010779","document":"tm245213-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924010779/tm245213-2_4seq1.xml","form_type":"4"}},{"id":1658571,"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":"2024-02-05T23:01:30.000Z","date":"2024-02-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":1801,"price":9.88,"value":17793.88,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":48190,"source":{"system":"sec-edgar","filing":"0001104659-24-010779","document":"tm245213-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924010779/tm245213-2_4seq1.xml","form_type":"4"}},{"id":1658570,"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":"2024-02-05T23:01:30.000Z","date":"2024-02-01","kind":"exercise","planned":false,"acquired":true,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":49991,"source":{"system":"sec-edgar","filing":"0001104659-24-010779","document":"tm245213-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924010779/tm245213-2_4seq1.xml","form_type":"4"}},{"id":1663785,"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":"Restricted Stock Units","published_at":"2024-02-01T23:01:55.000Z","date":"2024-01-30","kind":"exercise","planned":false,"acquired":false,"shares":9275,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested in substantially equal annual installments over the 4 years following January 30, 2023, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs become vested in substantially equal annual installments over the 4 years following January 30, 2023, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":27825,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":9275},"source":{"system":"sec-edgar","filing":"0001104659-24-009540","document":"tm244961-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924009540/tm244961-3_4seq1.xml","form_type":"4"}},{"id":1663784,"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":"2024-02-01T23:01:55.000Z","date":"2024-01-31","kind":"grant","planned":false,"acquired":true,"shares":3257,"price":2.69,"value":8761.33,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from August 1, 2023 through January 31, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"In accordance with the ESPP, these shares were purchased based on 85% of the opening price of the issuer's common stock on August 1, 2023."}],"balance_after":43825,"source":{"system":"sec-edgar","filing":"0001104659-24-009540","document":"tm244961-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924009540/tm244961-3_4seq1.xml","form_type":"4"}},{"id":1663783,"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":"2024-02-01T23:01:55.000Z","date":"2024-01-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":2709,"price":9.8,"value":26548.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":40568,"source":{"system":"sec-edgar","filing":"0001104659-24-009540","document":"tm244961-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924009540/tm244961-3_4seq1.xml","form_type":"4"}},{"id":1663782,"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":"2024-02-01T23:01:55.000Z","date":"2024-01-30","kind":"exercise","planned":false,"acquired":true,"shares":9275,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":43277,"source":{"system":"sec-edgar","filing":"0001104659-24-009540","document":"tm244961-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924009540/tm244961-3_4seq1.xml","form_type":"4"}},{"id":1668094,"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":"Restricted Stock Units","published_at":"2024-01-29T23:31:27.000Z","date":"2024-01-25","kind":"grant","planned":false,"acquired":true,"shares":58400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 25, 2024, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs vest in substantially equal annual installments over the 4 years following January 25, 2024, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":58400,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":58400},"source":{"system":"sec-edgar","filing":"0001104659-24-007861","document":"tm244341-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924007861/tm244341-3_4seq1.xml","form_type":"4"}},{"id":1668093,"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":"Stock Options (option to buy)","published_at":"2024-01-29T23:31:27.000Z","date":"2024-01-25","kind":"grant","planned":false,"acquired":true,"shares":163200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Twenty-five percent of the shares underlying the option become vested and exercisable on January 25, 2025 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 25, 2025, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":163200,"derivative":{"exercise_price":9.28,"expiration_date":"2034-01-25","underlying":"Common Stock, par value $0.0001","underlying_shares":163200},"source":{"system":"sec-edgar","filing":"0001104659-24-007861","document":"tm244341-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465924007861/tm244341-3_4seq1.xml","form_type":"4"}},{"id":1817750,"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":"2023-08-02T21:49:52.000Z","date":"2023-07-31","kind":"grant","planned":false,"acquired":true,"shares":691,"price":2.81,"value":1941.71,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from February 1, 2023 through July 31, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on July 31, 2023."}],"balance_after":34002,"source":{"system":"sec-edgar","filing":"0001104659-23-086905","document":"tm2322669-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923086905/tm2322669-3_4seq1.xml","form_type":"4"}},{"id":1940082,"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":"2023-03-24T00:28:29.000Z","date":"2023-03-23","kind":"purchase","planned":false,"acquired":true,"shares":10000,"price":4.22,"value":42200.0,"ownership":{"direct":true},"balance_after":33311,"source":{"system":"sec-edgar","filing":"0001104659-23-036172","document":"tm2310423-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923036172/tm2310423-1_4seq1.xml","form_type":"4"}},{"id":2030436,"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":"Restricted Stock Units","published_at":"2023-02-06T21:31:06.000Z","date":"2023-02-02","kind":"exercise","acquired":false,"shares":7775,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":23325,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":7775},"source":{"system":"sec-edgar","filing":"0001104659-23-011211","document":"tm235551-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923011211/tm235551-2_4seq1.xml","form_type":"4"}},{"id":2030435,"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":"2023-02-06T21:31:06.000Z","date":"2023-02-02","kind":"tax_withholding","acquired":false,"shares":2364,"price":15.04,"value":35554.56,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":23311,"source":{"system":"sec-edgar","filing":"0001104659-23-011211","document":"tm235551-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923011211/tm235551-2_4seq1.xml","form_type":"4"}},{"id":2030434,"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":"2023-02-06T21:31:06.000Z","date":"2023-02-02","kind":"exercise","acquired":true,"shares":7775,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":25675,"source":{"system":"sec-edgar","filing":"0001104659-23-011211","document":"tm235551-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923011211/tm235551-2_4seq1.xml","form_type":"4"}},{"id":2035671,"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":"Restricted Stock Units","published_at":"2023-02-02T22:10:41.000Z","date":"2023-02-01","kind":"exercise","acquired":false,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs become vested in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":12332,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":6166},"source":{"system":"sec-edgar","filing":"0001104659-23-009974","document":"tm235311-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923009974/tm235311-3_4seq1.xml","form_type":"4"}},{"id":2035670,"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":"2023-02-02T22:10:41.000Z","date":"2023-02-01","kind":"tax_withholding","acquired":false,"shares":2183,"price":13.78,"value":30081.74,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":17900,"source":{"system":"sec-edgar","filing":"0001104659-23-009974","document":"tm235311-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923009974/tm235311-3_4seq1.xml","form_type":"4"}},{"id":2035669,"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":"2023-02-02T22:10:41.000Z","date":"2023-02-01","kind":"exercise","acquired":true,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":20083,"source":{"system":"sec-edgar","filing":"0001104659-23-009974","document":"tm235311-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923009974/tm235311-3_4seq1.xml","form_type":"4"}},{"id":2035668,"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":"2023-02-02T22:10:41.000Z","date":"2023-01-31","kind":"grant","acquired":true,"shares":1296,"price":10.2085,"value":13230.216,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from August 1, 2022 through January 31, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the opening price of the issuer's common stock on August 1, 2022."}],"balance_after":13917,"source":{"system":"sec-edgar","filing":"0001104659-23-009974","document":"tm235311-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923009974/tm235311-3_4seq1.xml","form_type":"4"}},{"id":2038398,"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":"Restricted Stock Units","published_at":"2023-02-01T22:30:31.000Z","date":"2023-01-30","kind":"grant","acquired":true,"shares":37100,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested in substantially equal annual installments over the 4 years following January 30, 2023, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs become vested in substantially equal annual installments over the 4 years following January 30, 2023, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":37100,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":37100},"source":{"system":"sec-edgar","filing":"0001104659-23-009352","document":"tm235142-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923009352/tm235142-1_4seq1.xml","form_type":"4"}},{"id":2038397,"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":"Stock Options (option to buy)","published_at":"2023-02-01T22:30:31.000Z","date":"2023-01-30","kind":"grant","acquired":true,"shares":105000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Twenty-five percent of the shares underlying the option become vested and exercisable on January 30, 2024 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 30, 2024, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":105000,"derivative":{"exercise_price":12.88,"expiration_date":"2033-01-30","underlying":"Common Stock, par value $0.0001","underlying_shares":105000},"source":{"system":"sec-edgar","filing":"0001104659-23-009352","document":"tm235142-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465923009352/tm235142-1_4seq1.xml","form_type":"4"}},{"id":2195535,"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":"2022-08-03T20:08:59.000Z","date":"2022-07-31","kind":"grant","acquired":true,"shares":1076,"price":6.86,"value":7381.36,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from February 1, 2022 through July 31, 2022."}],"balance_after":12621,"source":{"system":"sec-edgar","filing":"0001104659-22-085624","document":"tm2222488-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922085624/tm2222488-3_4seq1.xml","form_type":"4"}},{"id":2360152,"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":"Stock Options (option to buy)","published_at":"2022-03-03T00:00:41.000Z","date":"2022-02-28","kind":"exercise","acquired":false,"shares":30000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Twenty-five percent of the shares underlying the option became vested and exercisable on January 2, 2021 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 2, 2021, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":31400,"derivative":{"exercise_price":1.9213,"expiration_date":"2030-01-02","underlying":"Common Stock, par value $0.0001","underlying_shares":30000},"source":{"system":"sec-edgar","filing":"0001104659-22-029462","document":"tm228203-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922029462/tm228203-1_4seq1.xml","form_type":"4"}},{"id":2360151,"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":"2022-03-03T00:00:41.000Z","date":"2022-02-28","kind":"sale","acquired":false,"shares":30000,"price":7.52,"value":225600.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.30 to $7.70, 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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":11545,"source":{"system":"sec-edgar","filing":"0001104659-22-029462","document":"tm228203-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922029462/tm228203-1_4seq1.xml","form_type":"4"}},{"id":2360150,"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":"2022-03-03T00:00:41.000Z","date":"2022-02-28","kind":"exercise","acquired":true,"shares":30000,"price":1.9213,"value":57639.0,"ownership":{"direct":true},"balance_after":41545,"source":{"system":"sec-edgar","filing":"0001104659-22-029462","document":"tm228203-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922029462/tm228203-1_4seq1.xml","form_type":"4"}},{"id":2413423,"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":"Restricted Stock Units","published_at":"2022-02-04T00:56:15.000Z","date":"2022-02-02","kind":"grant","acquired":true,"shares":31100,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The RSUs become vested and exercisable in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The RSUs become vested and exercisable in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":31100,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":31100},"source":{"system":"sec-edgar","filing":"0001104659-22-011519","document":"tm225504-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922011519/tm225504-3_4seq1.xml","form_type":"4"}},{"id":2413422,"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":"Stock Options (option to buy)","published_at":"2022-02-04T00:56:15.000Z","date":"2022-02-02","kind":"grant","acquired":true,"shares":91600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"Twenty-five percent of the shares underlying the option become vested and exercisable on February 2, 2023 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 2, 2023, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":91600,"derivative":{"exercise_price":7.53,"expiration_date":"2032-02-02","underlying":"Common Stock, par value $0.0001","underlying_shares":91600},"source":{"system":"sec-edgar","filing":"0001104659-22-011519","document":"tm225504-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922011519/tm225504-3_4seq1.xml","form_type":"4"}},{"id":2413421,"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":"Restricted Stock Units","published_at":"2022-02-04T00:56:15.000Z","date":"2022-02-01","kind":"exercise","acquired":false,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested and exercisable in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs become vested and exercisable in substantially equal annual installments over the 4 years following February 1, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":18498,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":6166},"source":{"system":"sec-edgar","filing":"0001104659-22-011519","document":"tm225504-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922011519/tm225504-3_4seq1.xml","form_type":"4"}},{"id":2413420,"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":"2022-02-04T00:56:15.000Z","date":"2022-02-01","kind":"tax_withholding","acquired":false,"shares":2183,"price":7.98,"value":17420.34,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs."}],"balance_after":11545,"source":{"system":"sec-edgar","filing":"0001104659-22-011519","document":"tm225504-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922011519/tm225504-3_4seq1.xml","form_type":"4"}},{"id":2413419,"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":"2022-02-04T00:56:15.000Z","date":"2022-02-01","kind":"exercise","acquired":true,"shares":6166,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."}],"balance_after":13728,"source":{"system":"sec-edgar","filing":"0001104659-22-011519","document":"tm225504-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922011519/tm225504-3_4seq1.xml","form_type":"4"}},{"id":2413418,"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":"2022-02-04T00:56:15.000Z","date":"2022-01-31","kind":"grant","acquired":true,"shares":1800,"price":6.86,"value":12348.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from August 1, 2021 through January 31, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on January 31, 2022."}],"balance_after":7562,"source":{"system":"sec-edgar","filing":"0001104659-22-011519","document":"tm225504-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465922011519/tm225504-3_4seq1.xml","form_type":"4"}},{"id":2611340,"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":"2021-08-06T23:02:16.000Z","date":"2021-07-31","kind":"grant","acquired":true,"shares":725,"price":7.7095,"value":5589.3875,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from February 1, 2021 through July 31, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on July 31, 2021."}],"balance_after":5762,"source":{"system":"sec-edgar","filing":"0001104659-21-101663","document":"tm2124283-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000110465921101663/tm2124283-3_4seq1.xml","form_type":"4"}},{"id":2881381,"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":"Restricted Stock Units","published_at":"2021-02-04T00:00:45.000Z","date":"2021-02-01","kind":"grant","acquired":true,"shares":24664,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"Each Restricted Stock Unit (\"RSU\") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested and exercisable in substantially equal annual installments over the 4 years following February 2, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs become vested and exercisable in substantially equal annual installments over the 4 years following February 2, 2021, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date."}],"balance_after":24664,"derivative":{"underlying":"Common Stock, par value $0.0001","underlying_shares":24664},"source":{"system":"sec-edgar","filing":"0000899243-21-004757","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000089924321004757/doc4.xml","form_type":"4"}},{"id":2881380,"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":"Stock Options (option to buy)","published_at":"2021-02-04T00:00:45.000Z","date":"2021-02-01","kind":"grant","acquired":true,"shares":90000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Twenty-five percent of the shares underlying the option become vested and exercisable on February 1, 2022 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":90000,"derivative":{"exercise_price":16.71,"expiration_date":"2031-02-01","underlying":"Common Stock, par value $0.0001","underlying_shares":90000},"source":{"system":"sec-edgar","filing":"0000899243-21-004757","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000089924321004757/doc4.xml","form_type":"4"}},{"id":2881379,"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":"2021-02-04T00:00:45.000Z","date":"2021-01-31","kind":"grant","acquired":true,"shares":968,"price":12.14,"value":11751.52,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from August 1, 2020 through January 31, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on January 31, 2021."}],"balance_after":5037,"source":{"system":"sec-edgar","filing":"0000899243-21-004757","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000089924321004757/doc4.xml","form_type":"4"}},{"id":2980954,"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":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2020-11-13T23:00:09.000Z","date":"2020-11-12","kind":"sale","acquired":false,"shares":4015,"price":10.02,"value":40230.3,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.75 to $10.16, 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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":4069,"source":{"system":"sec-edgar","filing":"0000899243-20-031029","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000089924320031029/doc4.xml","form_type":"4"}},{"id":3069372,"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":"2020-08-04T23:00:46.000Z","date":"2020-07-31","kind":"grant","acquired":true,"shares":8084,"price":1.46,"value":11802.64,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These shares were purchased due to participation by the reporting individual in the issuer's 2019 Employee Stock Purchase Plan (\"ESPP\"). It pertains to the ESPP purchase period from February 1, 2020 through July 31, 2020."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on February 1, 2020."}],"balance_after":8084,"source":{"system":"sec-edgar","filing":"0000899243-20-021219","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000089924320021219/doc4.xml","form_type":"4"}},{"id":3322461,"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":"Stock Options (option to buy)","published_at":"2020-01-03T22:01:17.000Z","date":"2020-01-02","kind":"grant","acquired":true,"shares":61400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Twenty-five percent of the shares underlying the option become vested and exercisable on January 2, 2021 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 2, 2021, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":61400,"derivative":{"exercise_price":1.9213,"expiration_date":"2030-01-02","underlying":"Common Stock, par value $0.0001","underlying_shares":61400},"source":{"system":"sec-edgar","filing":"0000899243-20-000276","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000089924320000276/doc4.xml","form_type":"4"}},{"id":3417356,"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":"Stock Options (option to buy)","published_at":"2019-09-11T20:07:51.000Z","date":"2019-09-09","kind":"grant","acquired":true,"shares":107000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Twenty-five percent of the shares underlying the option become vested and exercisable on September 9, 2020 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following September 9, 2020, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":107000,"derivative":{"exercise_price":2.13,"expiration_date":"2029-09-09","underlying":"Common Stock, par value $0.0001","underlying_shares":107000},"source":{"system":"sec-edgar","filing":"0000899243-19-023318","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326190/000089924319023318/doc4.xml","form_type":"4"}}]}