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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":78789,"source":{"system":"sec-edgar","filing":"0001567619-21-018029","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1676725/000156761921018029/doc1.xml","form_type":"4"}},{"id":2546046,"issuer":{"id":4069,"kind":"organization","name":"IDEAYA Biosciences, Inc.","symbol":"IDYA"},"owners":[{"id":134769,"kind":"person","name":"Dillon Michael P.","position":1,"cik":"0001777415","reported_name":"Dillon Michael P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Chief Scientific Officer"}}],"security":"Common Stock","published_at":"2021-10-07T20:11:25.000Z","date":"2021-10-04","kind":"sale","acquired":false,"shares":500,"price":25.848,"value":12924.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $25.39 to $26.38, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":79789,"source":{"system":"sec-edgar","filing":"0001567619-21-018029","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1676725/000156761921018029/doc1.xml","form_type":"4"}},{"id":2546045,"issuer":{"id":4069,"kind":"organization","name":"IDEAYA Biosciences, Inc.","symbol":"IDYA"},"owners":[{"id":134769,"kind":"person","name":"Dillon Michael P.","position":1,"cik":"0001777415","reported_name":"Dillon Michael P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Chief Scientific Officer"}}],"security":"Common 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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":78989,"source":{"system":"sec-edgar","filing":"0001567619-21-016927","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1676725/000156761921016927/doc1.xml","form_type":"4"}},{"id":2574339,"issuer":{"id":4069,"kind":"organization","name":"IDEAYA Biosciences, Inc.","symbol":"IDYA"},"owners":[{"id":134769,"kind":"person","name":"Dillon Michael P.","position":1,"cik":"0001777415","reported_name":"Dillon Michael P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Chief Scientific Officer"}}],"security":"Common Stock","published_at":"2021-09-09T23:24:12.000Z","date":"2021-09-08","kind":"exercise","acquired":true,"shares":4313,"price":11.08,"value":47788.04,"ownership":{"direct":true},"balance_after":90173,"source":{"system":"sec-edgar","filing":"0001567619-21-016927","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1676725/000156761921016927/doc1.xml","form_type":"4"}},{"id":2574338,"issuer":{"id":4069,"kind":"organization","name":"IDEAYA Biosciences, Inc.","symbol":"IDYA"},"owners":[{"id":134769,"kind":"person","name":"Dillon Michael P.","position":1,"cik":"0001777415","reported_name":"Dillon Michael P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Chief Scientific Officer"}}],"security":"Common Stock","published_at":"2021-09-09T23:24:12.000Z","date":"2021-09-08","kind":"exercise","acquired":true,"shares":7071,"price":4.31,"value":30476.01,"ownership":{"direct":true},"balance_after":85860,"source":{"system":"sec-edgar","filing":"0001567619-21-016927","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1676725/000156761921016927/doc1.xml","form_type":"4"}},{"id":2574337,"issuer":{"id":4069,"kind":"organization","name":"IDEAYA Biosciences, Inc.","symbol":"IDYA"},"owners":[{"id":134769,"kind":"person","name":"Dillon Michael P.","position":1,"cik":"0001777415","reported_name":"Dillon Michael P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Chief Scientific Officer"}}],"security":"Common Stock","published_at":"2021-09-09T23:24:12.000Z","date":"2021-09-07","kind":"sale","acquired":false,"shares":116,"price":27.4569,"value":3185.0004,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $27.45 to $27.50, inclusive. 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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":78789,"source":{"system":"sec-edgar","filing":"0001567619-21-016820","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1676725/000156761921016820/doc1.xml","form_type":"4"}},{"id":2606400,"issuer":{"id":4069,"kind":"organization","name":"IDEAYA Biosciences, Inc.","symbol":"IDYA"},"owners":[{"id":134769,"kind":"person","name":"Dillon Michael P.","position":1,"cik":"0001777415","reported_name":"Dillon Michael P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Chief Scientific Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-08-11T21:19:38.000Z","date":"2021-08-09","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"25% of the shares subject to the option vest on the first anniversary measured from February 27, 2018 (the \"Vesting Commencement Date\"), and 1/48th of the total number of shares vest monthly thereafter, such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date."}],"balance_after":66235,"derivative":{"exercise_price":4.31,"expiration_date":"2028-02-26","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001567619-21-015084","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1676725/000156761921015084/doc1.xml","form_type":"4"}},{"id":2606399,"issuer":{"id":4069,"kind":"organization","name":"IDEAYA Biosciences, Inc.","symbol":"IDYA"},"owners":[{"id":134769,"kind":"person","name":"Dillon Michael P.","position":1,"cik":"0001777415","reported_name":"Dillon Michael P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Chief Scientific Officer"}}],"security":"Common Stock","published_at":"2021-08-11T21:19:38.000Z","date":"2021-08-09","kind":"sale","acquired":false,"shares":400,"price":23.515,"value":9406.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades in prices ranging from $23.49 to $23.55, inclusive. 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