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These shares were sold in multiple transactions at prices ranging from $24.36 to $24.84, inclusive. The reporting person undertakes to provide to Lantheus Holdings, Inc., (\"LNTH\") any security holder of LNTH or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4."}],"balance_after":16994,"source":{"system":"sec-edgar","filing":"0000899243-19-016022","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000089924319016022/doc4.xml","form_type":"4"}},{"id":3500963,"issuer":{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-05T16:30:47.000Z","date":"2019-06-04","kind":"sale","acquired":false,"shares":1080,"price":24.6094,"value":26578.152,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 1, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.59 to $24.65 , inclusive. The reporting person undertakes to provide to Lantheus Holdings, Inc., (\"LNTH\") any security holder of LNTH or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (4) to this Form 4."}],"balance_after":26994,"source":{"system":"sec-edgar","filing":"0000899243-19-015598","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000089924319015598/doc4.xml","form_type":"4"}},{"id":3500962,"issuer":{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-05T16:30:47.000Z","date":"2019-06-04","kind":"sale","acquired":false,"shares":8920,"price":24.1122,"value":215080.824,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 1, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.59 to $24.58 , inclusive. The reporting person undertakes to provide to Lantheus Holdings, Inc., (\"LNTH\") any security holder of LNTH or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3) to this Form 4."}],"balance_after":28074,"source":{"system":"sec-edgar","filing":"0000899243-19-015598","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000089924319015598/doc4.xml","form_type":"4"}},{"id":3500961,"issuer":{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-05T16:30:47.000Z","date":"2019-06-03","kind":"sale","acquired":false,"shares":10000,"price":23.4725,"value":234725.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 1, 2019."},{"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 $23.25 to $23.78, inclusive. The reporting person undertakes to provide to Lantheus Holdings, Inc., (\"LNTH\") any security holder of LNTH or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4."}],"balance_after":36994,"source":{"system":"sec-edgar","filing":"0000899243-19-015598","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000089924319015598/doc4.xml","form_type":"4"}},{"id":3565902,"issuer":{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-04-03T16:30:21.000Z","date":"2019-04-01","kind":"sale","acquired":false,"shares":10000,"price":24.4094,"value":244094.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 28, 2019."},{"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 $24.11 to $25.00, inclusive. The reporting person undertakes to provide to Lantheus Holdings, Inc., (\"LNTH\") any security holder of LNTH or the staff of the Securities and Exchange Commission (\"SEC\"), upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4."}],"balance_after":46994,"source":{"system":"sec-edgar","filing":"0000899243-19-009765","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000089924319009765/doc4.xml","form_type":"4"}},{"id":3627018,"issuer":{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-02-28T16:21:40.000Z","date":"2019-02-26","kind":"grant","acquired":true,"shares":5353,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":56994,"source":{"system":"sec-edgar","filing":"0000899243-19-005223","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000089924319005223/doc4.xml","form_type":"4"}},{"id":4008690,"issuer":{"id":690,"kind":"organization","name":"Lantheus Holdings, Inc.","symbol":"LNTH"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-03-07T16:32:55.000Z","date":"2018-03-05","kind":"grant","acquired":true,"shares":7911,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":51641,"source":{"system":"sec-edgar","filing":"0000899243-18-006646","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000089924318006646/doc4.xml","form_type":"4"}},{"id":4117588,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2018-01-02T17:09:50.000Z","date":"2017-12-29","kind":"purchase","acquired":true,"shares":38699,"price":1.9323,"value":74778.0777,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.90 to $1.98 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":589453,"source":{"system":"sec-edgar","filing":"0001012975-18-000006","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297518000006/edgar.xml","form_type":"4"}},{"id":4117587,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2018-01-02T17:09:50.000Z","date":"2017-12-28","kind":"purchase","acquired":true,"shares":58711,"price":1.9191,"value":112672.2801,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.76 to $2.00 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":550754,"source":{"system":"sec-edgar","filing":"0001012975-18-000006","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297518000006/edgar.xml","form_type":"4"}},{"id":4121164,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-27T18:27:00.000Z","date":"2017-12-27","kind":"purchase","acquired":true,"shares":27706,"price":1.77,"value":49039.62,"ownership":{"direct":true},"balance_after":492043,"source":{"system":"sec-edgar","filing":"0001012975-17-000955","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000955/edgar.xml","form_type":"4"}},{"id":4121163,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-27T18:27:00.000Z","date":"2017-12-27","kind":"purchase","acquired":true,"shares":50000,"price":1.7634,"value":88170.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.738075 to $1.77 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":464337,"source":{"system":"sec-edgar","filing":"0001012975-17-000955","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000955/edgar.xml","form_type":"4"}},{"id":4121162,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-27T18:27:00.000Z","date":"2017-12-26","kind":"purchase","acquired":true,"shares":51442,"price":1.8131,"value":93269.4902,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.64 to $1.99 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":414337,"source":{"system":"sec-edgar","filing":"0001012975-17-000955","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000955/edgar.xml","form_type":"4"}},{"id":4121161,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-27T18:27:00.000Z","date":"2017-12-22","kind":"purchase","acquired":true,"shares":17982,"price":1.6059,"value":28877.2938,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.52 to $1.68 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":362895,"source":{"system":"sec-edgar","filing":"0001012975-17-000955","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000955/edgar.xml","form_type":"4"}},{"id":4138192,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-08T17:51:29.000Z","date":"2017-12-07","kind":"purchase","acquired":true,"shares":7639,"price":1.7421,"value":13307.9019,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.70 to $1.79 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":344913,"source":{"system":"sec-edgar","filing":"0001012975-17-000923","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000923/edgar.xml","form_type":"4"}},{"id":4138191,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-08T17:51:29.000Z","date":"2017-12-06","kind":"purchase","acquired":true,"shares":16106,"price":1.8003,"value":28995.6318,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.76 to $1.86 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":337274,"source":{"system":"sec-edgar","filing":"0001012975-17-000923","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000923/edgar.xml","form_type":"4"}},{"id":4142582,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-05T17:34:37.000Z","date":"2017-12-05","kind":"purchase","acquired":true,"shares":13495,"price":1.7775,"value":23987.3625,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.68 to $1.88 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":321168,"source":{"system":"sec-edgar","filing":"0001012975-17-000916","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000916/edgar.xml","form_type":"4"}},{"id":4142581,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-05T17:34:37.000Z","date":"2017-12-04","kind":"purchase","acquired":true,"shares":7300,"price":1.8076,"value":13195.48,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.78 to $1.84 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":307673,"source":{"system":"sec-edgar","filing":"0001012975-17-000916","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000916/edgar.xml","form_type":"4"}},{"id":4142580,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-12-05T17:34:37.000Z","date":"2017-12-01","kind":"purchase","acquired":true,"shares":5215,"price":1.8034,"value":9404.731,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.78 to $1.82 per share. The Reporting Person undertakes to provide, upon request by the Issuer, any security holder of the Issuer, or the SEC staff, full information regarding the number of shares purchased at each separate price."}],"balance_after":300373,"source":{"system":"sec-edgar","filing":"0001012975-17-000916","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1031735/000101297517000916/edgar.xml","form_type":"4"}},{"id":4147907,"issuer":{"id":5349,"kind":"organization","name":"Altimmune, Inc.","symbol":"ALT"},"owners":[{"id":150957,"kind":"person","name":"SCHAFFER DERACE L","position":1,"cik":"0001031735","reported_name":"SCHAFFER DERACE L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0001","published_at":"2017-11-30T17:38:53.000Z","date":"2017-11-30","kind":"purchase","acquired":true,"shares":12978,"price":1.8351,"value":23815.9278,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reflected is the weighted-average purchase price for shares purchased. The range of purchase prices for the transactions reported was $1.80 to $1.90 per share. 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