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The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by The Maetzold Descendants 2020 Trust of which the Reporting Person's spouse is the trustee and the Reporting Person's spouse and their children are beneficiaries."}],"balance_after":36013,"source":{"system":"sec-edgar","filing":"0001628280-26-052647","document":"wk-form4_1785875751.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052647/wk-form4_1785875751.xml","form_type":"4"}},{"id":697094,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":17918,"kind":"person","name":"MAETZOLD DEREK J","position":1,"cik":"0001239501","reported_name":"MAETZOLD DEREK J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres. & Chief Exec. 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The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":21479,"source":{"system":"sec-edgar","filing":"0001628280-26-052647","document":"wk-form4_1785875751.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052647/wk-form4_1785875751.xml","form_type":"4"}},{"id":697093,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":17918,"kind":"person","name":"MAETZOLD DEREK J","position":1,"cik":"0001239501","reported_name":"MAETZOLD DEREK J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres. & Chief Exec. 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The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"Held by The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold of which the Reporting Person is the trustee and his child is the beneficiary."}],"balance_after":11812,"source":{"system":"sec-edgar","filing":"0001628280-26-050616","document":"wk-form4_1785355793.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026050616/wk-form4_1785355793.xml","form_type":"4"}},{"id":701419,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":17918,"kind":"person","name":"MAETZOLD DEREK J","position":1,"cik":"0001239501","reported_name":"MAETZOLD DEREK J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres. & Chief Exec. 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The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Held by The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk of which the Reporting Person is the trustee and his child is the beneficiary."}],"balance_after":11812,"source":{"system":"sec-edgar","filing":"0001628280-26-050616","document":"wk-form4_1785355793.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026050616/wk-form4_1785355793.xml","form_type":"4"}},{"id":701418,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":17918,"kind":"person","name":"MAETZOLD DEREK J","position":1,"cik":"0001239501","reported_name":"MAETZOLD DEREK J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres. & Chief Exec. 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The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries."}],"balance_after":32296,"source":{"system":"sec-edgar","filing":"0001628280-26-050616","document":"wk-form4_1785355793.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026050616/wk-form4_1785355793.xml","form_type":"4"}},{"id":701417,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":17918,"kind":"person","name":"MAETZOLD DEREK J","position":1,"cik":"0001239501","reported_name":"MAETZOLD DEREK J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres. & Chief Exec. 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The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"Held by The Maetzold 2018 Remainder Trust FBO John Derek Maetzold of which the Reporting Person is the trustee and his child is the beneficiary."}],"balance_after":11822,"source":{"system":"sec-edgar","filing":"0001628280-26-050616","document":"wk-form4_1785355793.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026050616/wk-form4_1785355793.xml","form_type":"4"}},{"id":701413,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":17918,"kind":"person","name":"MAETZOLD DEREK J","position":1,"cik":"0001239501","reported_name":"MAETZOLD DEREK J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres. & Chief Exec. 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