{"transactions":[{"id":4624569,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-09-22T20:09:25.000Z","date":"2026-09-18","kind":"exercise","planned":false,"acquired":false,"shares":3750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on September 18, 2024, subject to the reporting person's continued service through each vesting date."}],"balance_after":3750,"derivative":{"expiration_date":"2027-09-18","underlying":"Common Stock","underlying_shares":3750},"source":{"system":"sec-edgar","filing":"0001992979-26-000004","document":"form4-09222026_080918.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000004/form4-09222026_080918.xml","form_type":"4"}},{"id":4624568,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2026-09-22T20:09:25.000Z","date":"2026-09-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":1345,"price":15.34,"value":20632.3,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":12367,"source":{"system":"sec-edgar","filing":"0001992979-26-000004","document":"form4-09222026_080918.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000004/form4-09222026_080918.xml","form_type":"4"}},{"id":4624567,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2026-09-22T20:09:25.000Z","date":"2026-09-18","kind":"exercise","planned":false,"acquired":true,"shares":3750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"The reported total includes 444 shares of Common Stock acquired by the reporting person in one or more transactions with the Issuer pursuant to its Employee Stock Purchase Plan, which transactions are exempt pursuant to Rules 16a3(f)(1)(i)(B) and 16b3(c)."}],"balance_after":13712,"source":{"system":"sec-edgar","filing":"0001992979-26-000004","document":"form4-09222026_080918.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000004/form4-09222026_080918.xml","form_type":"4"}},{"id":744312,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39981,"kind":"person","name":"Wigginton Jon Marc","position":1,"cik":"0001587487","reported_name":"Wigginton Jon Marc","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T20:24:53.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001587487-26-000002","document":"form4-06092026_080649.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000158748726000002/form4-06092026_080649.xml","form_type":"4"}},{"id":744311,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39980,"kind":"person","name":"Lobacki Joseph M","position":1,"cik":"0001536193","reported_name":"Lobacki Joseph M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T20:19:57.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001536193-26-000002","document":"form4-06092026_080653.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000153619326000002/form4-06092026_080653.xml","form_type":"4"}},{"id":744310,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39979,"kind":"person","name":"Jagpal Sukhi","position":1,"cik":"0001554591","reported_name":"Jagpal Sukhi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T20:18:09.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001554591-26-000002","document":"form4-06092026_080605.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000155459126000002/form4-06092026_080605.xml","form_type":"4"}},{"id":744309,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39978,"kind":"person","name":"Hunter Heidi","position":1,"cik":"0001891841","reported_name":"Hunter Heidi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T20:16:35.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001891841-26-000002","document":"form4-06092026_080631.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000189184126000002/form4-06092026_080631.xml","form_type":"4"}},{"id":744308,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39163,"kind":"person","name":"Dybbs Michael","position":1,"cik":"0001601264","reported_name":"Dybbs Michael","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T20:14:50.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001601264-26-000006","document":"form4-06092026_080646.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000160126426000006/form4-06092026_080646.xml","form_type":"4"}},{"id":744390,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":29281,"kind":"person","name":"MATSUI CONNIE","position":1,"cik":"0001236537","reported_name":"MATSUI CONNIE","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T20:12:59.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001236537-26-000002","document":"form4-06092026_080655.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1236537/000123653726000002/form4-06092026_080655.xml","form_type":"4"}},{"id":744448,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":40001,"kind":"person","name":"Petree Daniel H","position":1,"cik":"0001294939","reported_name":"Petree Daniel H","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T16:23:55.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001294939-26-000002","document":"form4-06092026_080650.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1294939/000129493926000002/form4-06092026_080650.xml","form_type":"4"}},{"id":744369,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39990,"kind":"person","name":"PANEK JAMES P","position":1,"cik":"0001217412","reported_name":"PANEK JAMES P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-06-09T16:21:24.000Z","date":"2026-06-05","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest, subject to the reporting person's provision of service to the issuer on each vesting date, as to 8.33% of the total award monthly, with the first tranche vesting on July 5, 2026, and the award shall be fully vested and exercisable on the earlier of (i) the date of the issuer's 2027 annual stockholders meeting or (ii) June 5, 2027."}],"balance_after":10000,"derivative":{"exercise_price":26.09,"expiration_date":"2036-06-05","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001217412-26-000002","document":"form4-06092026_080620.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1217412/000121741226000002/form4-06092026_080620.xml","form_type":"4"}},{"id":754238,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-06-02T20:16:04.000Z","date":"2026-06-02","kind":"exercise","planned":false,"acquired":false,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The award vested or vests annually as to 1/4th of the total award, subject to the reporting person's continued service to the Issuer on each vesting date, with the first tranche vested on June 2, 2026."}],"balance_after":7500,"derivative":{"expiration_date":"2029-06-02","underlying":"Common Stock","underlying_shares":2500},"source":{"system":"sec-edgar","filing":"0001761333-26-000005","document":"form4-06022026_080600.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000176133326000005/form4-06022026_080600.xml","form_type":"4"}},{"id":754237,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Common Stock","published_at":"2026-06-02T20:16:04.000Z","date":"2026-06-02","kind":"exercise","planned":false,"acquired":true,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"For avoidance of doubt, the reporting person elected to satisfy tax withholding liabilities in cash in lieu of withholding shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reported total includes 250 shares of Common Stock acquired by the reporting person in one or more transactions with the Issuer pursuant to its employee stock purchase plan, which transactions are exempt pursuant to Rules 16a3(f)(1)(i)(B) and 16b3(c)."}],"balance_after":4725,"source":{"system":"sec-edgar","filing":"0001761333-26-000005","document":"form4-06022026_080600.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000176133326000005/form4-06022026_080600.xml","form_type":"4"}},{"id":855584,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-06T21:25:03.000Z","date":"2026-03-04","kind":"exercise","planned":false,"acquired":false,"shares":675,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 4, 2023, subject to continued service through each vesting date."}],"balance_after":0,"derivative":{"expiration_date":"2026-03-04","underlying":"Common Stock","underlying_shares":675},"source":{"system":"sec-edgar","filing":"0002063633-26-000003","document":"form4-03062026_090355.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000003/form4-03062026_090355.xml","form_type":"4"}},{"id":855583,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2026-03-06T21:25:03.000Z","date":"2026-03-04","kind":"tax_withholding","planned":false,"acquired":false,"shares":277,"price":21.31,"value":5902.87,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":9748,"source":{"system":"sec-edgar","filing":"0002063633-26-000003","document":"form4-03062026_090355.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000003/form4-03062026_090355.xml","form_type":"4"}},{"id":855582,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2026-03-06T21:25:03.000Z","date":"2026-03-04","kind":"exercise","planned":false,"acquired":true,"shares":675,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":10025,"source":{"system":"sec-edgar","filing":"0002063633-26-000003","document":"form4-03062026_090355.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000003/form4-03062026_090355.xml","form_type":"4"}},{"id":856090,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-06T16:21:10.000Z","date":"2026-03-04","kind":"exercise","planned":false,"acquired":false,"shares":788,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 4, 2023, subject to continued service through each vesting date."}],"balance_after":0,"derivative":{"expiration_date":"2026-03-04","underlying":"Common Stock","underlying_shares":788},"source":{"system":"sec-edgar","filing":"0001872398-26-000003","document":"form4-03062026_090306.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000003/form4-03062026_090306.xml","form_type":"4"}},{"id":856089,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T16:21:10.000Z","date":"2026-03-04","kind":"tax_withholding","planned":false,"acquired":false,"shares":282,"price":21.31,"value":6009.42,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":21285,"source":{"system":"sec-edgar","filing":"0001872398-26-000003","document":"form4-03062026_090306.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000003/form4-03062026_090306.xml","form_type":"4"}},{"id":856088,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T16:21:10.000Z","date":"2026-03-04","kind":"exercise","planned":false,"acquired":true,"shares":788,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":21567,"source":{"system":"sec-edgar","filing":"0001872398-26-000003","document":"form4-03062026_090306.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000003/form4-03062026_090306.xml","form_type":"4"}},{"id":865714,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Stock Option (right to buy)","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":33600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"1/48 of the total option award shall vest monthly, subject to the reporting person's continued service to the Issuer on each vesting date, with the first tranche vesting on April 1, 2026."}],"balance_after":33600,"derivative":{"exercise_price":20.55,"expiration_date":"2036-03-02","underlying":"Common Stock","underlying_shares":33600},"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865713,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":4200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs shall vest as to 1/4 of the total award annually, with the first tranche vesting on March 1, 2027, subject to continued service through each vesting date."}],"balance_after":4200,"derivative":{"expiration_date":"2030-03-01","underlying":"Common Stock","underlying_shares":4200},"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865712,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-02","kind":"exercise","planned":false,"acquired":false,"shares":2356,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 2, 2026, subject to continued service through each vesting date."}],"balance_after":7069,"derivative":{"expiration_date":"2029-03-02","underlying":"Common Stock","underlying_shares":2356},"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865711,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":842,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2025, subject to continued service through each vesting date."}],"balance_after":1686,"derivative":{"expiration_date":"2028-03-01","underlying":"Common Stock","underlying_shares":842},"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865710,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2024, subject to continued service through each vesting date."}],"balance_after":500,"derivative":{"expiration_date":"2027-03-01","underlying":"Common Stock","underlying_shares":500},"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865709,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":970,"price":20.55,"value":19933.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs; does not represent a sale by the reporting person."}],"balance_after":9350,"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865708,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-02","kind":"exercise","planned":false,"acquired":true,"shares":2356,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":10320,"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865707,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":551,"price":20.47,"value":11278.97,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs; does not represent a sale by the reporting person."}],"balance_after":7964,"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865706,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":842,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":8515,"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865705,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2026-03-03T23:59:49.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":7673,"source":{"system":"sec-edgar","filing":"0002063633-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363326000002/form4-03032026_110346.xml","form_type":"4"}},{"id":865704,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T23:51:52.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":5000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs shall vest as to 1/4 of the total award annually, with the first tranche vesting on March 1, 2027, subject to continued service through each vesting date."}],"balance_after":5000,"derivative":{"expiration_date":"2030-03-01","underlying":"Common Stock","underlying_shares":5000},"source":{"system":"sec-edgar","filing":"0001761333-26-000002","document":"form4-03032026_110348.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000176133326000002/form4-03032026_110348.xml","form_type":"4"}},{"id":865703,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Stock Option (right to buy)","published_at":"2026-03-03T23:51:52.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":40000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48 of the total option award shall vest monthly, subject to the reporting person's continued service through each vesting date, with the first tranche vesting on April 1, 2026."}],"balance_after":40000,"derivative":{"exercise_price":20.55,"expiration_date":"2036-03-02","underlying":"Common Stock","underlying_shares":40000},"source":{"system":"sec-edgar","filing":"0001761333-26-000002","document":"form4-03032026_110348.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000176133326000002/form4-03032026_110348.xml","form_type":"4"}},{"id":868513,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Stock Option (right to buy)","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":40000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"1/48 of the total option award shall vest monthly, subject to the reporting person's continued service through each vesting date, with the first tranche vesting on April 1, 2026."}],"balance_after":40000,"derivative":{"exercise_price":20.55,"expiration_date":"2036-03-02","underlying":"Common Stock","underlying_shares":40000},"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868512,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":5000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs shall vest as to 1/4 of the total award annually, with the first tranche vesting on March 1, 2027, subject to continued service through each vesting date."}],"balance_after":5000,"derivative":{"expiration_date":"2030-03-01","underlying":"Common Stock","underlying_shares":5000},"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868511,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-02","kind":"exercise","planned":false,"acquired":false,"shares":2843,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 2, 2026, subject to continued service through each vesting date."}],"balance_after":8532,"derivative":{"expiration_date":"2029-03-02","underlying":"Common Stock","underlying_shares":2843},"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868510,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":1125,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2025, subject to continued service through each vesting date."}],"balance_after":2250,"derivative":{"expiration_date":"2028-03-01","underlying":"Common Stock","underlying_shares":1125},"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868509,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":1170,"price":20.55,"value":24043.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":9518,"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868508,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-02","kind":"exercise","planned":false,"acquired":true,"shares":2843,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":10688,"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868507,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":463,"price":20.47,"value":9477.61,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":7845,"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868506,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2026-03-03T18:56:49.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":1125,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":8308,"source":{"system":"sec-edgar","filing":"0001992979-26-000002","document":"form4-03032026_110346.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297926000002/form4-03032026_110346.xml","form_type":"4"}},{"id":868196,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Option (right to buy)","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":175000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"1/48 of the total option award shall vest monthly, subject to the reporting person's continued service through each vesting date, with the first tranche vesting on April 1, 2026."}],"balance_after":175000,"derivative":{"exercise_price":20.55,"expiration_date":"2036-03-02","underlying":"Common Stock","underlying_shares":175000},"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868195,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":40000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs shall vest as to 1/4 of the total award annually, with the first tranche vesting on March 1, 2027, subject to continued service through each vesting date."}],"balance_after":40000,"derivative":{"expiration_date":"2030-03-01","underlying":"Common Stock","underlying_shares":40000},"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868194,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-02","kind":"exercise","planned":false,"acquired":false,"shares":7750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 2, 2026, subject to continued service through each vesting date."}],"balance_after":23250,"derivative":{"expiration_date":"2029-03-02","underlying":"Common Stock","underlying_shares":7750},"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868193,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2025, subject to continued service through each vesting date."}],"balance_after":5000,"derivative":{"expiration_date":"2028-03-01","underlying":"Common Stock","underlying_shares":2500},"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868192,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":688,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2024, subject to continued service through each vesting date."}],"balance_after":688,"derivative":{"expiration_date":"2027-03-01","underlying":"Common Stock","underlying_shares":688},"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868191,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":2779,"price":20.55,"value":57108.45,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":20779,"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868190,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-02","kind":"exercise","planned":false,"acquired":true,"shares":7750,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":23558,"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868189,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":1271,"price":20.47,"value":26017.37,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":15808,"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868188,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":17079,"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":868187,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-03T18:48:50.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":688,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":14579,"source":{"system":"sec-edgar","filing":"0001872398-26-000002","document":"form4-03032026_110347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239826000002/form4-03032026_110347.xml","form_type":"4"}},{"id":957987,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39981,"kind":"person","name":"Wigginton Jon Marc","position":1,"cik":"0001587487","reported_name":"Wigginton Jon Marc","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T22:05:53.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001587487-25-000004","document":"form4-12292025_101249.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000158748725000004/form4-12292025_101249.xml","form_type":"4"}},{"id":958056,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":29281,"kind":"person","name":"MATSUI CONNIE","position":1,"cik":"0001236537","reported_name":"MATSUI CONNIE","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T22:03:16.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001236537-25-000008","document":"form4-12292025_101213.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1236537/000123653725000008/form4-12292025_101213.xml","form_type":"4"}},{"id":957986,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39980,"kind":"person","name":"Lobacki Joseph M","position":1,"cik":"0001536193","reported_name":"Lobacki Joseph M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T22:00:19.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001536193-25-000004","document":"form4-12292025_101215.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000153619325000004/form4-12292025_101215.xml","form_type":"4"}},{"id":957985,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39979,"kind":"person","name":"Jagpal Sukhi","position":1,"cik":"0001554591","reported_name":"Jagpal Sukhi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T21:58:48.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001554591-25-000004","document":"form4-12292025_091244.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000155459125000004/form4-12292025_091244.xml","form_type":"4"}},{"id":957984,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39978,"kind":"person","name":"Hunter Heidi","position":1,"cik":"0001891841","reported_name":"Hunter Heidi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T21:57:47.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001891841-25-000005","document":"form4-12292025_091243.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000189184125000005/form4-12292025_091243.xml","form_type":"4"}},{"id":957983,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39163,"kind":"person","name":"Dybbs Michael","position":1,"cik":"0001601264","reported_name":"Dybbs Michael","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T21:54:49.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001601264-25-000005","document":"form4-12292025_091245.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000160126425000005/form4-12292025_091245.xml","form_type":"4"}},{"id":957982,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T21:51:17.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":7200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48 of the total option award shall vest monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":7200,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":7200},"source":{"system":"sec-edgar","filing":"0002063633-25-000006","document":"form4-12292025_091213.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363325000006/form4-12292025_091213.xml","form_type":"4"}},{"id":957981,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T21:47:42.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":8200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48 of the total option award shall vest monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":8200,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":8200},"source":{"system":"sec-edgar","filing":"0001761333-25-000008","document":"form4-12292025_091238.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000176133325000008/form4-12292025_091238.xml","form_type":"4"}},{"id":958082,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":40001,"kind":"person","name":"Petree Daniel H","position":1,"cik":"0001294939","reported_name":"Petree Daniel H","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T17:05:06.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001294939-25-000004","document":"form4-12292025_101202.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1294939/000129493925000004/form4-12292025_101202.xml","form_type":"4"}},{"id":958039,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39990,"kind":"person","name":"PANEK JAMES P","position":1,"cik":"0001217412","reported_name":"PANEK JAMES P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T17:04:22.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option shall vest as to 16.67% of the total award monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":1500,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001217412-25-000003","document":"form4-12292025_101218.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1217412/000121741225000003/form4-12292025_101218.xml","form_type":"4"}},{"id":958364,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Stock Option (right to buy)","published_at":"2025-12-29T16:49:28.000Z","date":"2025-12-23","kind":"grant","planned":false,"acquired":true,"shares":7925,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48 of the total option award shall vest monthly, subject to the reporting person's continued service to the issuer on each vesting date, with the first tranche vesting on January 23, 2026."}],"balance_after":7925,"derivative":{"exercise_price":10.38,"expiration_date":"2035-12-23","underlying":"Common Stock","underlying_shares":7925},"source":{"system":"sec-edgar","filing":"0001992979-25-000006","document":"form4-12292025_091224.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297925000006/form4-12292025_091224.xml","form_type":"4"}},{"id":967780,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-12-16T20:47:26.000Z","date":"2025-12-12","kind":"exercise","planned":false,"acquired":false,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSU award vested or vests as to 1/4th of the total award annually, subject to continued service through each vesting date, with the first tranche vested on December 1, 2024.  The reported transaction represents the deferred vesting and settlement of a tranche of this award pursuant to the terms of the reporting person's award agreement with the Issuer."}],"balance_after":5000,"derivative":{"expiration_date":"2027-12-01","underlying":"Common Stock","underlying_shares":2500},"source":{"system":"sec-edgar","filing":"0001872398-25-000005","document":"form4-12172025_011222.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239825000005/form4-12172025_011222.xml","form_type":"4"}},{"id":967779,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-12-16T20:47:26.000Z","date":"2025-12-12","kind":"tax_withholding","planned":false,"acquired":false,"shares":894,"price":8.015,"value":7165.41,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs; does not represent a sale by the reporting person."}],"balance_after":13891,"source":{"system":"sec-edgar","filing":"0001872398-25-000005","document":"form4-12172025_011222.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239825000005/form4-12172025_011222.xml","form_type":"4"}},{"id":967778,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-12-16T20:47:26.000Z","date":"2025-12-12","kind":"exercise","planned":false,"acquired":true,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":14785,"source":{"system":"sec-edgar","filing":"0001872398-25-000005","document":"form4-12172025_011222.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239825000005/form4-12172025_011222.xml","form_type":"4"}},{"id":1017459,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Common Stock","published_at":"2025-10-16T12:18:45.000Z","date":"2025-10-15","kind":"purchase","planned":false,"acquired":true,"shares":19750,"price":0.81,"value":15997.5,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.8099 to $0.8100, 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 purchased at each separate price within the range set forth in this footnote."}],"balance_after":19750,"source":{"system":"sec-edgar","filing":"0001761333-25-000005","document":"form4-10162025_121041.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000176133325000005/form4-10162025_121041.xml","form_type":"4"}},{"id":1017494,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":29281,"kind":"person","name":"MATSUI CONNIE","position":1,"cik":"0001236537","reported_name":"MATSUI CONNIE","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-16T12:15:49.000Z","date":"2025-10-15","kind":"purchase","planned":false,"acquired":true,"shares":50000,"price":0.799,"value":39950.0,"ownership":{"direct":true},"balance_after":50000,"source":{"system":"sec-edgar","filing":"0001236537-25-000006","document":"form4-10162025_121046.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1236537/000123653725000006/form4-10162025_121046.xml","form_type":"4"}},{"id":1017458,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62244,"kind":"person","name":"Pauling David","position":1,"cik":"0002063633","reported_name":"Pauling David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Admin. Ofcr. & GC"}}],"security":"Common Stock","published_at":"2025-10-16T12:14:21.000Z","date":"2025-10-15","kind":"purchase","planned":false,"acquired":true,"shares":12504,"price":0.7992,"value":9993.1968,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"The reported total includes 2,500 shares of Common Stock acquired by the reporting person in one or more transactions with the Issuer pursuant to its Employee Stock Purchase Plan, which transactions are exempt pursuant to Rules 16a3(f)(1)(i)(B) and 16b3(c)."}],"balance_after":71737,"source":{"system":"sec-edgar","filing":"0002063633-25-000004","document":"form4-10162025_121018.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000206363325000004/form4-10162025_121018.xml","form_type":"4"}},{"id":1017700,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2025-10-16T08:19:45.000Z","date":"2025-10-15","kind":"purchase","planned":false,"acquired":true,"shares":17000,"price":0.8004,"value":13606.8,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.7932 to $0.8015, 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 purchased at each separate price within the range set forth in this footnote."}],"balance_after":71832,"source":{"system":"sec-edgar","filing":"0001992979-25-000004","document":"form4-10162025_121041.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297925000004/form4-10162025_121041.xml","form_type":"4"}},{"id":1017675,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-10-16T08:17:03.000Z","date":"2025-10-15","kind":"purchase","planned":false,"acquired":true,"shares":12500,"price":0.8009,"value":10011.25,"ownership":{"direct":true},"balance_after":122850,"source":{"system":"sec-edgar","filing":"0001872398-25-000004","document":"form4-10162025_121000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000187239825000004/form4-10162025_121000.xml","form_type":"4"}},{"id":1034827,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2025-09-22T17:01:41.000Z","date":"2025-09-18","kind":"exercise","planned":false,"acquired":false,"shares":37500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSU award vests annually as to 1/4th of the total award beginning on September 18, 2024, subject to the reporting person's continued service to the Issuer on each vesting date."}],"balance_after":75000,"derivative":{"expiration_date":"2027-09-18","underlying":"Common Stock","underlying_shares":37500},"source":{"system":"sec-edgar","filing":"0001992979-25-000003","document":"form4-09222025_090937.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297925000003/form4-09222025_090937.xml","form_type":"4"}},{"id":1034826,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2025-09-22T17:01:41.000Z","date":"2025-09-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":13417,"price":0.9,"value":12075.3,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":54832,"source":{"system":"sec-edgar","filing":"0001992979-25-000003","document":"form4-09222025_090937.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297925000003/form4-09222025_090937.xml","form_type":"4"}},{"id":1034825,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":63403,"kind":"person","name":"Gerber Hans-Peter","position":1,"cik":"0001992979","reported_name":"Gerber Hans-Peter","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2025-09-22T17:01:41.000Z","date":"2025-09-18","kind":"exercise","planned":false,"acquired":true,"shares":37500,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":68249,"source":{"system":"sec-edgar","filing":"0001992979-25-000003","document":"form4-09222025_090937.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1992979/000199297925000003/form4-09222025_090937.xml","form_type":"4"}},{"id":1055920,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":76104,"kind":"person","name":"Leyman Barbara","position":1,"cik":"0002028309","reported_name":"Leyman Barbara","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Business Officer"}}],"security":"Restricted Stock Units (RSUs)","published_at":"2025-08-26T21:21:26.000Z","date":"2025-07-08","kind":"exercise","planned":false,"acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vest as to 1/4th of the total award annually beginning on July 8, 2025, subject to the reporting person's continued service to the Issuer through each vesting date."}],"balance_after":75000,"derivative":{"expiration_date":"2028-07-08","underlying":"Common Stock","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001415889-25-023084","document":"form4-08272025_010822.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2028309/000141588925023084/form4-08272025_010822.xml","form_type":"4"}},{"id":1055919,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":76104,"kind":"person","name":"Leyman Barbara","position":1,"cik":"0002028309","reported_name":"Leyman Barbara","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Business Officer"}}],"security":"Common Stock","published_at":"2025-08-26T21:21:26.000Z","date":"2025-07-08","kind":"tax_withholding","planned":false,"acquired":false,"shares":8944,"price":0.78,"value":6976.32,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":16056,"source":{"system":"sec-edgar","filing":"0001415889-25-023084","document":"form4-08272025_010822.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2028309/000141588925023084/form4-08272025_010822.xml","form_type":"4"}},{"id":1055918,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":76104,"kind":"person","name":"Leyman Barbara","position":1,"cik":"0002028309","reported_name":"Leyman Barbara","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Business Officer"}}],"security":"Common Stock","published_at":"2025-08-26T21:21:26.000Z","date":"2025-07-08","kind":"exercise","planned":false,"acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":25000,"source":{"system":"sec-edgar","filing":"0001415889-25-023084","document":"form4-08272025_010822.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2028309/000141588925023084/form4-08272025_010822.xml","form_type":"4"}},{"id":1055846,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-08-26T21:20:43.000Z","date":"2025-08-09","kind":"exercise","planned":false,"acquired":false,"shares":18750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vested or vest as to 1/4th of the total award annually beginning on August 9, 2022, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":0,"derivative":{"expiration_date":"2025-08-09","underlying":"Common Stock","underlying_shares":18750},"source":{"system":"sec-edgar","filing":"0001415889-25-023083","document":"form4-08272025_010839.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000141588925023083/form4-08272025_010839.xml","form_type":"4"}},{"id":1055845,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-08-26T21:20:43.000Z","date":"2025-08-09","kind":"tax_withholding","planned":false,"acquired":false,"shares":6708,"price":0.8,"value":5366.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":110350,"source":{"system":"sec-edgar","filing":"0001415889-25-023083","document":"form4-08272025_010839.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000141588925023083/form4-08272025_010839.xml","form_type":"4"}},{"id":1055844,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":62312,"kind":"person","name":"Chung Jane","position":1,"cik":"0001872398","reported_name":"Chung Jane","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-08-26T21:20:43.000Z","date":"2025-08-09","kind":"exercise","planned":false,"acquired":true,"shares":18750,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":117058,"source":{"system":"sec-edgar","filing":"0001415889-25-023083","document":"form4-08272025_010839.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1872398/000141588925023083/form4-08272025_010839.xml","form_type":"4"}},{"id":1116049,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39981,"kind":"person","name":"Wigginton Jon Marc","position":1,"cik":"0001587487","reported_name":"Wigginton Jon Marc","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T20:14:14.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016471","document":"form4-06102025_080610.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925016471/form4-06102025_080610.xml","form_type":"4"}},{"id":1116158,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":29281,"kind":"person","name":"MATSUI CONNIE","position":1,"cik":"0001236537","reported_name":"MATSUI CONNIE","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T20:12:06.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016468","document":"form4-06102025_080602.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1236537/000141588925016468/form4-06102025_080602.xml","form_type":"4"}},{"id":1116050,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39980,"kind":"person","name":"Lobacki Joseph M","position":1,"cik":"0001536193","reported_name":"Lobacki Joseph M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T20:11:20.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016467","document":"form4-06102025_080614.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925016467/form4-06102025_080614.xml","form_type":"4"}},{"id":1116048,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39979,"kind":"person","name":"Jagpal Sukhi","position":1,"cik":"0001554591","reported_name":"Jagpal Sukhi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T20:10:33.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016466","document":"form4-06102025_080630.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925016466/form4-06102025_080630.xml","form_type":"4"}},{"id":1116047,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39978,"kind":"person","name":"Hunter Heidi","position":1,"cik":"0001891841","reported_name":"Hunter Heidi","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T20:09:35.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016464","document":"form4-06102025_080632.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925016464/form4-06102025_080632.xml","form_type":"4"}},{"id":1116046,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39163,"kind":"person","name":"Dybbs Michael","position":1,"cik":"0001601264","reported_name":"Dybbs Michael","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T20:08:22.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016463","document":"form4-06102025_080619.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925016463/form4-06102025_080619.xml","form_type":"4"}},{"id":1116173,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":40001,"kind":"person","name":"Petree Daniel H","position":1,"cik":"0001294939","reported_name":"Petree Daniel H","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T16:13:33.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016470","document":"form4-06102025_080628.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1294939/000141588925016470/form4-06102025_080628.xml","form_type":"4"}},{"id":1116130,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":39990,"kind":"person","name":"PANEK JAMES P","position":1,"cik":"0001217412","reported_name":"PANEK JAMES P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-06-10T16:12:50.000Z","date":"2025-06-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 8.33% of the total shares monthly, commencing July 6, 2025, with 100% of the total shares vested and exercisable on the earlier of the date of the issuer's 2026 annual stockholders meeting or June 6, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":50000,"derivative":{"exercise_price":0.85,"expiration_date":"2035-06-06","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001415889-25-016469","document":"form4-06102025_080644.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1217412/000141588925016469/form4-06102025_080644.xml","form_type":"4"}},{"id":1127304,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-06-02T20:27:52.000Z","date":"2025-06-02","kind":"grant","planned":false,"acquired":true,"shares":100000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSU award vests annually as to 1/4th of the total award beginning on June 2, 2026, subject to the reporting person's continued service to the Issuer on each vesting date."}],"balance_after":100000,"derivative":{"expiration_date":"2029-06-02","underlying":"Common Stock","underlying_shares":100000},"source":{"system":"sec-edgar","filing":"0001415889-25-015142","document":"form4-06022025_080648.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925015142/form4-06022025_080648.xml","form_type":"4"}},{"id":1127303,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":42319,"kind":"person","name":"Chow Gregory K.","position":1,"cik":"0001761333","reported_name":"Chow Gregory K.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Stock Option (right to buy)","published_at":"2025-06-02T20:27:52.000Z","date":"2025-06-02","kind":"grant","planned":false,"acquired":true,"shares":275000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"25% of the option award vests on June 2, 2026.  The remainder vests ratably as to 1/48th of the total award monthly thereafter, subject to the reporting person's continued service to the Issuer on each vesting date."}],"balance_after":275000,"derivative":{"exercise_price":0.9,"expiration_date":"2035-06-02","underlying":"Common Stock","underlying_shares":275000},"source":{"system":"sec-edgar","filing":"0001415889-25-015142","document":"form4-06022025_080648.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925015142/form4-06022025_080648.xml","form_type":"4"}},{"id":1142318,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":79595,"kind":"person","name":"ALBINI EDWARD C","position":1,"cik":"0001240014","reported_name":"ALBINI EDWARD C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO AND SECRETARY"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-05-19T16:11:42.000Z","date":"2025-05-15","kind":"exercise","planned":false,"acquired":false,"shares":9125,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The reported transactions represent the accelerated vesting of certain of the reporting person's equity awards outstanding under the issuer's 2018 Equity Incentive Plan, in connection with his separation and transition from his position with the issuer, as previously reported by the issuer in its Current Report filed with the Securities and Exchange Commission on Form 8-K on March 13, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs vest as to 1/4th of the total award annually beginning on March 4, 2023, subject to continued service through each vesting date."}],"balance_after":0,"derivative":{"expiration_date":"2026-03-04","underlying":"Common Stock","underlying_shares":9125},"source":{"system":"sec-edgar","filing":"0001415889-25-013618","document":"form4-05192025_080539.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1240014/000141588925013618/form4-05192025_080539.xml","form_type":"4"}},{"id":1142317,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":79595,"kind":"person","name":"ALBINI EDWARD C","position":1,"cik":"0001240014","reported_name":"ALBINI EDWARD C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO AND SECRETARY"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-05-19T16:11:42.000Z","date":"2025-05-15","kind":"exercise","planned":false,"acquired":false,"shares":11156,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The reported transactions represent the accelerated vesting of certain of the reporting person's equity awards outstanding under the issuer's 2018 Equity Incentive Plan, in connection with his separation and transition from his position with the issuer, as previously reported by the issuer in its Current Report filed with the Securities and Exchange Commission on Form 8-K on March 13, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs vest as to 1/4th of the total shares annually beginning on March 1, 2024, subject to continued service through each vesting date."}],"balance_after":4594,"derivative":{"expiration_date":"2027-03-01","underlying":"Common Stock","underlying_shares":11156},"source":{"system":"sec-edgar","filing":"0001415889-25-013618","document":"form4-05192025_080539.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1240014/000141588925013618/form4-05192025_080539.xml","form_type":"4"}},{"id":1142316,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":79595,"kind":"person","name":"ALBINI EDWARD C","position":1,"cik":"0001240014","reported_name":"ALBINI EDWARD C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO AND SECRETARY"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-05-19T16:11:42.000Z","date":"2025-05-15","kind":"exercise","planned":false,"acquired":false,"shares":24438,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vest as to 1/4th of the total award annually beginning on March 1, 2025, subject to continued service through each vesting date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The reported transactions represent the accelerated vesting of certain of the reporting person's equity awards outstanding under the issuer's 2018 Equity Incentive Plan, in connection with his separation and transition from his position with the issuer, as previously reported by the issuer in its Current Report filed with the Securities and Exchange Commission on Form 8-K on March 13, 2025."}],"balance_after":27312,"derivative":{"expiration_date":"2028-03-01","underlying":"Common Stock","underlying_shares":24438},"source":{"system":"sec-edgar","filing":"0001415889-25-013618","document":"form4-05192025_080539.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1240014/000141588925013618/form4-05192025_080539.xml","form_type":"4"}},{"id":1142315,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":79595,"kind":"person","name":"ALBINI EDWARD C","position":1,"cik":"0001240014","reported_name":"ALBINI EDWARD C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO AND SECRETARY"}}],"security":"Common Stock","published_at":"2025-05-19T16:11:42.000Z","date":"2025-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":15995,"price":0.88,"value":14075.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":160805,"source":{"system":"sec-edgar","filing":"0001415889-25-013618","document":"form4-05192025_080539.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1240014/000141588925013618/form4-05192025_080539.xml","form_type":"4"}},{"id":1142314,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":79595,"kind":"person","name":"ALBINI EDWARD C","position":1,"cik":"0001240014","reported_name":"ALBINI EDWARD C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO AND SECRETARY"}}],"security":"Common Stock","published_at":"2025-05-19T16:11:42.000Z","date":"2025-05-15","kind":"exercise","planned":false,"acquired":true,"shares":9125,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":176800,"source":{"system":"sec-edgar","filing":"0001415889-25-013618","document":"form4-05192025_080539.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1240014/000141588925013618/form4-05192025_080539.xml","form_type":"4"}},{"id":1142313,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":79595,"kind":"person","name":"ALBINI EDWARD C","position":1,"cik":"0001240014","reported_name":"ALBINI EDWARD C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO AND SECRETARY"}}],"security":"Common Stock","published_at":"2025-05-19T16:11:42.000Z","date":"2025-05-15","kind":"exercise","planned":false,"acquired":true,"shares":11156,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":167675,"source":{"system":"sec-edgar","filing":"0001415889-25-013618","document":"form4-05192025_080539.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1240014/000141588925013618/form4-05192025_080539.xml","form_type":"4"}},{"id":1142312,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":79595,"kind":"person","name":"ALBINI EDWARD C","position":1,"cik":"0001240014","reported_name":"ALBINI EDWARD C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO AND SECRETARY"}}],"security":"Common Stock","published_at":"2025-05-19T16:11:42.000Z","date":"2025-05-15","kind":"exercise","planned":false,"acquired":true,"shares":24438,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":156519,"source":{"system":"sec-edgar","filing":"0001415889-25-013618","document":"form4-05192025_080539.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1240014/000141588925013618/form4-05192025_080539.xml","form_type":"4"}},{"id":1158782,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":80138,"kind":"person","name":"Srinivasan Venkatesh","position":1,"cik":"0001974888","reported_name":"Srinivasan Venkatesh","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECH OP OFFICER"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-05-05T21:46:19.000Z","date":"2025-05-01","kind":"exercise","planned":false,"acquired":false,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vest as to 1/4th of the total award annually beginning on May 1, 2024, subject to continued service through each vesting date."}],"balance_after":5000,"derivative":{"expiration_date":"2027-05-01","underlying":"Common Stock","underlying_shares":2500},"source":{"system":"sec-edgar","filing":"0001415889-25-011997","document":"form4-05052025_090515.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925011997/form4-05052025_090515.xml","form_type":"4"}},{"id":1158781,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":80138,"kind":"person","name":"Srinivasan Venkatesh","position":1,"cik":"0001974888","reported_name":"Srinivasan Venkatesh","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECH OP OFFICER"}}],"security":"Common Stock","published_at":"2025-05-05T21:46:19.000Z","date":"2025-05-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":894,"price":1.07,"value":956.58,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":53686,"source":{"system":"sec-edgar","filing":"0001415889-25-011997","document":"form4-05052025_090515.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925011997/form4-05052025_090515.xml","form_type":"4"}},{"id":1158780,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":80138,"kind":"person","name":"Srinivasan Venkatesh","position":1,"cik":"0001974888","reported_name":"Srinivasan Venkatesh","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECH OP OFFICER"}}],"security":"Common Stock","published_at":"2025-05-05T21:46:19.000Z","date":"2025-05-01","kind":"exercise","planned":false,"acquired":true,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":54580,"source":{"system":"sec-edgar","filing":"0001415889-25-011997","document":"form4-05052025_090515.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925011997/form4-05052025_090515.xml","form_type":"4"}},{"id":1159473,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":31277,"kind":"person","name":"Borgman Anne Elizabeth","position":1,"cik":"0001886388","reported_name":"Borgman Anne Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF MEDICAL OFFICER"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-05-05T21:45:10.000Z","date":"2025-05-01","kind":"exercise","planned":false,"acquired":false,"shares":15938,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The reported transactions represent the accelerated vesting of certain of the reporting person's equity awards outstanding under the issuer's 2018 Equity Incentive Plan and 2021 Equity Inducement Plan, in connection with her separation and transition from her position with the issuer, as previously reported by the issuer in its Current Report filed with the Securities and Exchange Commission on Form 8-K on March 13, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs vest as to 1/4th of the total award annually beginning on March 1, 2025, subject to continued service through each vesting date."}],"balance_after":17812,"derivative":{"expiration_date":"2028-03-01","underlying":"Common Stock","underlying_shares":15938},"source":{"system":"sec-edgar","filing":"0001415889-25-011996","document":"form4-05052025_090507.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1886388/000141588925011996/form4-05052025_090507.xml","form_type":"4"}},{"id":1159472,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":31277,"kind":"person","name":"Borgman Anne Elizabeth","position":1,"cik":"0001886388","reported_name":"Borgman Anne Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF MEDICAL OFFICER"}}],"security":"Restricted Stock Unit (RSU)","published_at":"2025-05-05T21:45:10.000Z","date":"2025-05-01","kind":"exercise","planned":false,"acquired":false,"shares":53125,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each RSU represents a contingent right to receive one (1) share of the issuer's Common Stock upon settlement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSU award vests as to 1/4th of the total award annually on the last calendar day of February, beginning on February 29, 2024, subject to continued service through each vesting date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The reported transactions represent the accelerated vesting of certain of the reporting person's equity awards outstanding under the issuer's 2018 Equity Incentive Plan and 2021 Equity Inducement Plan, in connection with her separation and transition from her position with the issuer, as previously reported by the issuer in its Current Report filed with the Securities and Exchange Commission on Form 8-K on March 13, 2025."}],"balance_after":21875,"derivative":{"expiration_date":"2027-02-28","underlying":"Common Stock","underlying_shares":53125},"source":{"system":"sec-edgar","filing":"0001415889-25-011996","document":"form4-05052025_090507.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1886388/000141588925011996/form4-05052025_090507.xml","form_type":"4"}},{"id":1159471,"issuer":{"id":5797,"kind":"organization","name":"SUTRO BIOPHARMA, INC.","symbol":"STRO"},"owners":[{"id":31277,"kind":"person","name":"Borgman Anne Elizabeth","position":1,"cik":"0001886388","reported_name":"Borgman Anne Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF MEDICAL OFFICER"}}],"security":"Common Stock","published_at":"2025-05-05T21:45:10.000Z","date":"2025-05-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":24709,"price":1.07,"value":26438.63,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of restricted stock units; does not represent a sale by the reporting person."}],"balance_after":97452,"source":{"system":"sec-edgar","filing":"0001415889-25-011996","document":"form4-05052025_090507.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1886388/000141588925011996/form4-05052025_090507.xml","form_type":"4"}}],"next_cursor":"2025-05-05T21:45:10.000000Z,1159471"}