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These shares were sold in multiple transactions at prices ranging from $10.42 to $10.81 per share, 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 in this footnote."}],"balance_after":23615,"source":{"system":"sec-edgar","filing":"0001209191-20-005159","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326592/000120919120005159/doc4.xml","form_type":"4"}},{"id":3330410,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":114409,"kind":"person","name":"Hallam Trevor","position":1,"cik":"0001326592","reported_name":"Hallam Trevor","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Science Officer"}}],"security":"Common Stock","published_at":"2019-12-27T17:31:03.000Z","date":"2019-12-26","kind":"sale","acquired":false,"shares":975,"price":11.0792,"value":10802.22,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the holder."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reported price in Column 4 is a weighted average price.  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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 in this footnote."}],"balance_after":25565,"source":{"system":"sec-edgar","filing":"0001209191-19-058353","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326592/000120919119058353/doc4.xml","form_type":"4"}},{"id":3385278,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":114409,"kind":"person","name":"Hallam Trevor","position":1,"cik":"0001326592","reported_name":"Hallam Trevor","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Science Officer"}}],"security":"Common Stock","published_at":"2019-10-30T20:19:44.000Z","date":"2019-10-28","kind":"sale","acquired":false,"shares":975,"price":9.9755,"value":9726.1125,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the holder."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reported price in Column 4 is a weighted average price.  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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 in this footnote."}],"balance_after":26540,"source":{"system":"sec-edgar","filing":"0001209191-19-054572","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1326592/000120919119054572/doc4.xml","form_type":"4"}},{"id":3404248,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":114409,"kind":"person","name":"Hallam Trevor","position":1,"cik":"0001326592","reported_name":"Hallam Trevor","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Science Officer"}}],"security":"Restricted Stock Unit 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contingent right to receive 1 share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs vest as to 1/2 of the total shares annually beginning on September 26, 2019, subject to continued service through each vesting date."}],"balance_after":13774,"derivative":{"expiration_date":"2020-09-25","underlying":"Common Stock","underlying_shares":13774},"source":{"system":"sec-edgar","filing":"0001209191-18-052482","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1326592/000120919118052482/doc4.xml","form_type":"4"}},{"id":3806454,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":114409,"kind":"person","name":"Hallam Trevor","position":1,"cik":"0001326592","reported_name":"Hallam 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