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This Form 4 reports the surrender to the Issuer by the Reporting Person of 68,469 shares of Common Stock -- granted in the form of RSUs on January 3, 2013 and January 3, 2014 -- in order to satisfy those withholding tax obligations."}],"balance_after":647763,"source":{"system":"sec-edgar","filing":"0001140361-16-089411","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089411/form4.xml","form_type":"4"}},{"id":4525835,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":89685,"kind":"person","name":"ROSE ERIC A MD","position":1,"cik":"0001139301","reported_name":"ROSE ERIC A MD","relationship":{"director":true,"officer":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2016-12-12T22:33:36.000Z","date":"2016-12-08","kind":"exercise","acquired":true,"shares":66668,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":716232,"source":{"system":"sec-edgar","filing":"0001140361-16-089411","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089411/form4.xml","form_type":"4"}},{"id":4525834,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":89685,"kind":"person","name":"ROSE ERIC A MD","position":1,"cik":"0001139301","reported_name":"ROSE ERIC A MD","relationship":{"director":true,"officer":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2016-12-12T22:33:36.000Z","date":"2016-12-08","kind":"exercise","acquired":true,"shares":66667,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":649564,"source":{"system":"sec-edgar","filing":"0001140361-16-089411","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089411/form4.xml","form_type":"4"}},{"id":4536157,"issuer":{"id":121309,"kind":"organization","name":"ABIOMED INC","symbol":"NASD"},"owners":[{"id":89685,"kind":"person","name":"ROSE ERIC A MD","position":1,"cik":"0001139301","reported_name":"ROSE ERIC A MD","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock option (right to buy)","published_at":"2016-12-02T16:11:43.000Z","date":"2016-11-30","kind":"exercise","acquired":false,"shares":8000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Grant to report person of option to buy shares of Common Stock set forth in Table II, Column 7, under the ABIOMED, Inc. 2000 Stock Incentive Plan."},{"field":"kind","element":"transactionCoding","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."},{"field":"shares","element":"transactionShares","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."}],"balance_after":0,"derivative":{"exercise_price":12.69,"exercise_date":"2008-08-13","expiration_date":"2017-08-08","underlying":"Common Stock","underlying_shares":8000},"source":{"system":"sec-edgar","filing":"0001179110-16-032321","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/815094/000117911016032321/edgar.xml","form_type":"4"}},{"id":4536156,"issuer":{"id":121309,"kind":"organization","name":"ABIOMED INC","symbol":"NASD"},"owners":[{"id":89685,"kind":"person","name":"ROSE ERIC A MD","position":1,"cik":"0001139301","reported_name":"ROSE ERIC A MD","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, $.01 par value","published_at":"2016-12-02T16:11:43.000Z","date":"2016-11-30","kind":"sale","acquired":false,"shares":4559,"price":111.1641,"value":506797.1319,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."},{"field":"shares","element":"transactionShares","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This price represents the weighted average sale price of multiple transactions on the reported date at prices that ranged between $111.0400 and $111.3250. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer, or a security holder of the Issuer."}],"balance_after":13259,"source":{"system":"sec-edgar","filing":"0001179110-16-032321","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/815094/000117911016032321/edgar.xml","form_type":"4"}},{"id":4536155,"issuer":{"id":121309,"kind":"organization","name":"ABIOMED INC","symbol":"NASD"},"owners":[{"id":89685,"kind":"person","name":"ROSE ERIC A MD","position":1,"cik":"0001139301","reported_name":"ROSE ERIC A MD","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, $.01 par value","published_at":"2016-12-02T16:11:43.000Z","date":"2016-11-30","kind":"sale","acquired":false,"shares":3441,"price":110.3373,"value":379670.6493,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."},{"field":"shares","element":"transactionShares","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This price represents the weighted average sale price of multiple transactions on the reported date at prices that ranged between $110.0100 and $110.9900. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer, or a security holder of the Issuer."}],"balance_after":17818,"source":{"system":"sec-edgar","filing":"0001179110-16-032321","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/815094/000117911016032321/edgar.xml","form_type":"4"}},{"id":4536154,"issuer":{"id":121309,"kind":"organization","name":"ABIOMED INC","symbol":"NASD"},"owners":[{"id":89685,"kind":"person","name":"ROSE ERIC A MD","position":1,"cik":"0001139301","reported_name":"ROSE ERIC A MD","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, $.01 par value","published_at":"2016-12-02T16:11:43.000Z","date":"2016-11-30","kind":"exercise","acquired":true,"shares":8000,"price":12.69,"value":101520.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."},{"field":"shares","element":"transactionShares","label":"F3","text":"Sale of common stock pursuant to reporting owner's 10b5-1 plan."}],"balance_after":21259,"source":{"system":"sec-edgar","filing":"0001179110-16-032321","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/815094/000117911016032321/edgar.xml","form_type":"4"}},{"id":4543507,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":89685,"kind":"person","name":"ROSE ERIC A MD","position":1,"cik":"0001139301","reported_name":"ROSE ERIC A MD","relationship":{"director":true,"officer":true,"officer_title":"Executive Chairman"}}],"security":"Restricted Stock Units","published_at":"2016-11-23T21:08:04.000Z","date":"2016-11-22","kind":"grant","acquired":true,"shares":300000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The RSUs were granted to the reporting person pursuant to the reporting person's amended and restated employment agreement as Executive Chairman of the Company and in accordance with the terms of the Company's 2010 Stock Incentive Plan. 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