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Each stock option represents a right to purchase one share of the Company's common stock upon vesting at the exercise price."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F6","text":"The number of options granted was determined by multiplying 25% of the total non-employee director compensation value, and then dividing by the Black-Scholes value of a single option calculated as of the date of the grant."}],"balance_after":11296,"derivative":{"exercise_price":7.99,"expiration_date":"2033-04-30","underlying":"Common Stock","underlying_shares":11296},"source":{"system":"sec-edgar","filing":"0001536908-26-000004","document":"wk-form4_1777930251.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1367644/000153690826000004/wk-form4_1777930251.xml","form_type":"4"}},{"id":793592,"issuer":{"id":5902,"kind":"organization","name":"Emergent BioSolutions Inc.","symbol":"EBS"},"owners":[{"id":49919,"kind":"person","name":"Dayal Sujata Tyagi","position":1,"cik":"0001536908","reported_name":"Dayal Sujata Tyagi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-04T21:30:54.000Z","date":"2026-05-01","kind":"sale","planned":true,"acquired":false,"shares":980,"price":8.94,"value":8761.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the number of shares sold by the Reporting Person. Shares were sold pursuant to a Rule 10b5-1 trading plan, dated August 8, 2025, for the purpose of satisfying tax obligations relating to the vesting of RSUs on April 29, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price for sales executed on the same day within a one-dollar price range. These shares were sold in multiple transactions at prices ranging from $8.70 to $8.99, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, 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 range set forth above."}],"balance_after":100563,"source":{"system":"sec-edgar","filing":"0001536908-26-000004","document":"wk-form4_1777930251.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1367644/000153690826000004/wk-form4_1777930251.xml","form_type":"4"}},{"id":793591,"issuer":{"id":5902,"kind":"organization","name":"Emergent BioSolutions Inc.","symbol":"EBS"},"owners":[{"id":49919,"kind":"person","name":"Dayal Sujata Tyagi","position":1,"cik":"0001536908","reported_name":"Dayal Sujata Tyagi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-04T21:30:54.000Z","date":"2026-05-01","kind":"sale","planned":true,"acquired":false,"shares":12781,"price":8.36,"value":106849.16,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the number of shares sold by the Reporting Person. Shares were sold pursuant to a Rule 10b5-1 trading plan, dated August 8, 2025, for the purpose of satisfying tax obligations relating to the vesting of RSUs on April 29, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price for sales executed on the same day within a one-dollar price range. These shares were sold in multiple transactions at prices ranging from $7.70 to $8.69, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, 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 range set forth above."}],"balance_after":101543,"source":{"system":"sec-edgar","filing":"0001536908-26-000004","document":"wk-form4_1777930251.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1367644/000153690826000004/wk-form4_1777930251.xml","form_type":"4"}},{"id":793590,"issuer":{"id":5902,"kind":"organization","name":"Emergent BioSolutions Inc.","symbol":"EBS"},"owners":[{"id":49919,"kind":"person","name":"Dayal Sujata Tyagi","position":1,"cik":"0001536908","reported_name":"Dayal Sujata Tyagi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-04T21:30:54.000Z","date":"2026-04-30","kind":"grant","planned":true,"acquired":true,"shares":25344,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents an annual grant of restricted stock units (\"RSUs\") granted under the Company's Stock Incentive plan, as amended and restated, for Board and Committee service. 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