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The price reported above reflects the weighted-average sale price. 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":48719,"source":{"system":"sec-edgar","filing":"0001628280-26-065870","document":"wk-form4_1792008382.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1856542/000162828026065870/wk-form4_1792008382.xml","form_type":"4"}},{"id":4636993,"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":6832,"source":{"system":"sec-edgar","filing":"0001628280-26-065327","document":"wk-form4_1791403842.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026065327/wk-form4_1791403842.xml","form_type":"4"}},{"id":4636991,"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":"F3","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":8038,"source":{"system":"sec-edgar","filing":"0001628280-26-065327","document":"wk-form4_1791403842.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026065327/wk-form4_1791403842.xml","form_type":"4"}},{"id":4636990,"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":21064,"source":{"system":"sec-edgar","filing":"0001628280-26-065327","document":"wk-form4_1791403842.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026065327/wk-form4_1791403842.xml","form_type":"4"}},{"id":4636989,"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 price reported above reflects the weighted-average sale price. 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":13356,"source":{"system":"sec-edgar","filing":"0001628280-26-064912","document":"wk-form4_1791230843.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1856565/000162828026064912/wk-form4_1791230843.xml","form_type":"4"}},{"id":4629812,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":1624,"kind":"person","name":"Oelschlager Kristen M","position":1,"cik":"0001856565","reported_name":"Oelschlager Kristen M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-10-05T20:07:31.000Z","date":"2026-10-01","kind":"sale","planned":true,"acquired":false,"shares":2807,"price":35.75,"value":100350.25,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person, on March 17, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $35.21 to $36.19, inclusive. The price reported above reflects the weighted-average sale price. 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":14702,"source":{"system":"sec-edgar","filing":"0001628280-26-064912","document":"wk-form4_1791230843.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1856565/000162828026064912/wk-form4_1791230843.xml","form_type":"4"}},{"id":4629811,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":1624,"kind":"person","name":"Oelschlager Kristen M","position":1,"cik":"0001856565","reported_name":"Oelschlager Kristen M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-10-05T20:07:31.000Z","date":"2026-10-01","kind":"exercise","planned":true,"acquired":true,"shares":4153,"price":3.38,"value":14037.14,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person, on March 17, 2026."}],"balance_after":17509,"source":{"system":"sec-edgar","filing":"0001628280-26-064912","document":"wk-form4_1791230843.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1856565/000162828026064912/wk-form4_1791230843.xml","form_type":"4"}},{"id":4634851,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":360,"kind":"person","name":"Juvenal Tobin W","position":1,"cik":"0001856542","reported_name":"Juvenal Tobin W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Common Stock","published_at":"2026-10-02T00:21:18.000Z","date":"2026-09-30","kind":"sale","planned":true,"acquired":false,"shares":1034,"price":34.2,"value":35362.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on May 28, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $34.090 to $34.525, inclusive. The price reported above reflects the weighted-average sale price. 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":52007,"source":{"system":"sec-edgar","filing":"0001628280-26-064267","document":"wk-form4_1790886076.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026064267/wk-form4_1790886076.xml","form_type":"4"}},{"id":4634850,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":360,"kind":"person","name":"Juvenal Tobin W","position":1,"cik":"0001856542","reported_name":"Juvenal Tobin W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Common Stock","published_at":"2026-10-02T00:21:18.000Z","date":"2026-09-29","kind":"sale","planned":true,"acquired":false,"shares":5543,"price":35.498,"value":196765.414,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on May 28, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $35.010 to $35.935, inclusive. The price reported above reflects the weighted-average sale price. 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":53041,"source":{"system":"sec-edgar","filing":"0001628280-26-064267","document":"wk-form4_1790886076.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026064267/wk-form4_1790886076.xml","form_type":"4"}},{"id":4625433,"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":9550,"source":{"system":"sec-edgar","filing":"0001628280-26-063221","document":"wk-form4_1790195226.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026063221/wk-form4_1790195226.xml","form_type":"4"}},{"id":4625431,"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":"F3","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":11236,"source":{"system":"sec-edgar","filing":"0001628280-26-063221","document":"wk-form4_1790195226.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026063221/wk-form4_1790195226.xml","form_type":"4"}},{"id":4625430,"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":"0001628280-26-063221","document":"wk-form4_1790195226.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026063221/wk-form4_1790195226.xml","form_type":"4"}},{"id":4625429,"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":11256,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671033,"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":11256,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671032,"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":11256,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671031,"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":14995,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671030,"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":"F3","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":17641,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671029,"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":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671028,"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":"F8","text":"Held by The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold of which the Reporting Person is the trustee and his child is the beneficiary."}],"balance_after":11277,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671027,"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":11277,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671026,"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":11277,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671025,"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":11277,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671024,"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":15172,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671023,"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":"F3","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":17850,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671022,"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":22435,"source":{"system":"sec-edgar","filing":"0001628280-26-059816","document":"wk-form4_1788293526.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059816/wk-form4_1788293526.xml","form_type":"4"}},{"id":671021,"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 price reported above reflects the weighted-average sale price. 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":66914,"source":{"system":"sec-edgar","filing":"0001628280-26-059272","document":"wk-form4_1787863108.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059272/wk-form4_1787863108.xml","form_type":"4"}},{"id":674910,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":1624,"kind":"person","name":"Oelschlager Kristen M","position":1,"cik":"0001856565","reported_name":"Oelschlager Kristen M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-08-26T20:16:51.000Z","date":"2026-08-25","kind":"sale","planned":false,"acquired":false,"shares":5223,"price":34.639,"value":180919.497,"ownership":{"direct":false,"nature":"The Fritz Shorter Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $34.495 to $34.750, inclusive. The price reported above reflects the weighted-average sale price. 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":"F2","text":"Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries."}],"balance_after":72649,"source":{"system":"sec-edgar","filing":"0001628280-26-059091","document":"wk-form4_1787775408.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059091/wk-form4_1787775408.xml","form_type":"4"}},{"id":674909,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":1624,"kind":"person","name":"Oelschlager Kristen M","position":1,"cik":"0001856565","reported_name":"Oelschlager Kristen M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-08-26T20:16:51.000Z","date":"2026-08-25","kind":"sale","planned":false,"acquired":false,"shares":7161,"price":34.263,"value":245357.343,"ownership":{"direct":false,"nature":"The Fritz Shorter Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $33.470 to $34.460, inclusive. The price reported above reflects the weighted-average sale price. 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":"F2","text":"Held by the Fritz Shorter Trust of which the Reporting Person and her spouse are the trustees and beneficiaries."}],"balance_after":77872,"source":{"system":"sec-edgar","filing":"0001628280-26-059091","document":"wk-form4_1787775408.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059091/wk-form4_1787775408.xml","form_type":"4"}},{"id":674908,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":1624,"kind":"person","name":"Oelschlager Kristen M","position":1,"cik":"0001856565","reported_name":"Oelschlager Kristen M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-08-26T20:16:51.000Z","date":"2026-08-24","kind":"sale","planned":false,"acquired":false,"shares":12218,"price":33.687,"value":411587.766,"ownership":{"direct":false,"nature":"The Fritz Shorter Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $33.500 to $33.885, inclusive. The price reported above reflects the weighted-average sale price. 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The price reported above reflects the weighted-average sale price. 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The price reported above reflects the weighted-average sale price. 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":35177,"source":{"system":"sec-edgar","filing":"0001628280-26-057644","document":"wk-form4_1787083838.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026057644/wk-form4_1787083838.xml","form_type":"4"}},{"id":683387,"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":14388,"source":{"system":"sec-edgar","filing":"0001628280-26-053391","document":"wk-form4_1785961098.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026053391/wk-form4_1785961098.xml","form_type":"4"}},{"id":695537,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":1624,"kind":"person","name":"Oelschlager Kristen M","position":1,"cik":"0001856565","reported_name":"Oelschlager Kristen M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-08-05T20:18:21.000Z","date":"2026-08-03","kind":"sale","planned":true,"acquired":false,"shares":3000,"price":29.12,"value":87360.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person, on March 17, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $28.46 to $29.45, inclusive. The price reported above reflects the weighted-average sale price. 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":18874,"source":{"system":"sec-edgar","filing":"0001628280-26-053391","document":"wk-form4_1785961098.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026053391/wk-form4_1785961098.xml","form_type":"4"}},{"id":697108,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":360,"kind":"person","name":"Juvenal Tobin W","position":1,"cik":"0001856542","reported_name":"Juvenal Tobin W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Common Stock","published_at":"2026-08-04T20:36:12.000Z","date":"2026-08-03","kind":"sale","planned":true,"acquired":false,"shares":1730,"price":28.25,"value":48872.5,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $28.030 to $28.630, inclusive. The price reported above reflects the weighted-average sale price. 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":78995,"source":{"system":"sec-edgar","filing":"0001628280-26-052648","document":"wk-form4_1785875769.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052648/wk-form4_1785875769.xml","form_type":"4"}},{"id":697107,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":360,"kind":"person","name":"Juvenal Tobin W","position":1,"cik":"0001856542","reported_name":"Juvenal Tobin W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Common Stock","published_at":"2026-08-04T20:36:12.000Z","date":"2026-07-31","kind":"sale","planned":true,"acquired":false,"shares":1891,"price":30.264,"value":57229.224,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $30.150 to $30.645, inclusive. The price reported above reflects the weighted-average sale price. 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":80725,"source":{"system":"sec-edgar","filing":"0001628280-26-052648","document":"wk-form4_1785875769.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052648/wk-form4_1785875769.xml","form_type":"4"}},{"id":697106,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":360,"kind":"person","name":"Juvenal Tobin W","position":1,"cik":"0001856542","reported_name":"Juvenal Tobin W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Common Stock","published_at":"2026-08-04T20:36:12.000Z","date":"2026-07-31","kind":"sale","planned":true,"acquired":false,"shares":7270,"price":29.579,"value":215039.33,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $29.150 to $30.130, inclusive. The price reported above reflects the weighted-average sale price. 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":82616,"source":{"system":"sec-edgar","filing":"0001628280-26-052648","document":"wk-form4_1785875769.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052648/wk-form4_1785875769.xml","form_type":"4"}},{"id":697105,"issuer":{"id":359,"kind":"organization","name":"CASTLE BIOSCIENCES INC","symbol":"CSTL"},"owners":[{"id":360,"kind":"person","name":"Juvenal Tobin W","position":1,"cik":"0001856542","reported_name":"Juvenal Tobin W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Common Stock","published_at":"2026-08-04T20:36:12.000Z","date":"2026-07-31","kind":"sale","planned":true,"acquired":false,"shares":8149,"price":28.842,"value":235033.458,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 10, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $28.150 to $29.140, inclusive. The price reported above reflects the weighted-average sale price. 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":89886,"source":{"system":"sec-edgar","filing":"0001628280-26-052648","document":"wk-form4_1785875769.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052648/wk-form4_1785875769.xml","form_type":"4"}},{"id":697102,"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 Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries."}],"balance_after":27009,"source":{"system":"sec-edgar","filing":"0001628280-26-052647","document":"wk-form4_1785875751.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052647/wk-form4_1785875751.xml","form_type":"4"}},{"id":697099,"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 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":31781,"source":{"system":"sec-edgar","filing":"0001628280-26-052647","document":"wk-form4_1785875751.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052647/wk-form4_1785875751.xml","form_type":"4"}},{"id":697098,"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":6,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052647/wk-form4_1785875751.xml","form_type":"4"}},{"id":697097,"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 Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries."}],"balance_after":30606,"source":{"system":"sec-edgar","filing":"0001628280-26-052647","document":"wk-form4_1785875751.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026052647/wk-form4_1785875751.xml","form_type":"4"}},{"id":697095,"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 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."},{"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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