{"transactions":[{"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":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":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":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":1175314,"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":"2025-04-08T20:05:26.000Z","date":"2025-04-04","kind":"grant","planned":false,"acquired":true,"shares":94250,"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 2, 2026, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":94250,"derivative":{"expiration_date":"2029-03-02","underlying":"Common Stock","underlying_shares":94250},"source":{"system":"sec-edgar","filing":"0001415889-25-010381","document":"form4-04082025_080422.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925010381/form4-04082025_080422.xml","form_type":"4"}},{"id":1175313,"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":"2025-04-08T20:05:26.000Z","date":"2025-04-04","kind":"grant","planned":false,"acquired":true,"shares":101500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests as to 2.0833% of the total award monthly, beginning on May 4, 2025, with 100% of the award being vested and exercisable on April 4, 2029, subject to the reporting person's provision of service to the issuer on each vesting date."}],"balance_after":101500,"derivative":{"exercise_price":0.55,"expiration_date":"2035-04-04","underlying":"Common Stock","underlying_shares":101500},"source":{"system":"sec-edgar","filing":"0001415889-25-010381","document":"form4-04082025_080422.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382101/000141588925010381/form4-04082025_080422.xml","form_type":"4"}}]}