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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 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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":13556,"source":{"system":"sec-edgar","filing":"0001628280-26-060430","document":"wk-form4_1788466051.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1856565/000162828026060430/wk-form4_1788466051.xml","form_type":"4"}},{"id":2061,"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":"2026-09-03T20:07:34.000Z","date":"2026-09-01","kind":"exercise","planned":true,"acquired":true,"shares":4152,"price":3.38,"value":14033.76,"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":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 68 shares acquired on August 31, 2026, under the Issuer's employee stock purchase plan."}],"balance_after":17508,"source":{"system":"sec-edgar","filing":"0001628280-26-060430","document":"wk-form4_1788466051.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1856565/000162828026060430/wk-form4_1788466051.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. 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":85033,"source":{"system":"sec-edgar","filing":"0001628280-26-059091","document":"wk-form4_1787775408.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026059091/wk-form4_1787775408.xml","form_type":"4"}},{"id":695539,"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":1100,"price":30.62,"value":33682.0,"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":"F4","text":"This transaction was executed in multiple trades at prices ranging from $30.55 to $30.71, 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":13288,"source":{"system":"sec-edgar","filing":"0001628280-26-053391","document":"wk-form4_1785961098.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026053391/wk-form4_1785961098.xml","form_type":"4"}},{"id":695538,"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":4486,"price":30,"value":134580.0,"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":"F3","text":"This transaction was executed in multiple trades at prices ranging from $29.53 to $30.44, 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":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":715077,"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":"2026-07-06T20:24:56.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":400,"price":24.78,"value":9912.0,"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":"F3","text":"This transaction was executed in multiple trades at prices ranging from $24.77 to $24.79, 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":21874,"source":{"system":"sec-edgar","filing":"0001628280-26-047286","document":"wk-form4_1783369493.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026047286/wk-form4_1783369493.xml","form_type":"4"}},{"id":715076,"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":"2026-07-06T20:24:56.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":8186,"price":24.4,"value":199738.4,"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 $23.73 to $24.72, 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":22274,"source":{"system":"sec-edgar","filing":"0001628280-26-047286","document":"wk-form4_1783369493.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026047286/wk-form4_1783369493.xml","form_type":"4"}},{"id":731957,"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":"2026-06-18T20:19:46.000Z","date":"2026-06-16","kind":"sale","planned":true,"acquired":false,"shares":8587,"price":20.71,"value":177836.77,"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 $20.51 to $20.95, 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":30460,"source":{"system":"sec-edgar","filing":"0001628280-26-044327","document":"wk-form4_1781813983.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828026044327/wk-form4_1781813983.xml","form_type":"4"}},{"id":858234,"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":"Restricted Stock 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The price reported above reflects the weighted-average sale price. The Reporting Person hereby\nundertakes 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\ntransaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"On November 11, 2025, the Reporting Person transferred 3,686 shares from  the Fritz Shorter Trust to their direct holdings."}],"balance_after":12323,"source":{"system":"sec-edgar","filing":"0001628280-25-052013","document":"wk-form4_1763068055.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828025052013/wk-form4_1763068055.xml","form_type":"4"}},{"id":1008085,"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":"2025-11-05T01:56:27.000Z","date":"2025-10-31","kind":"sale","planned":true,"acquired":false,"shares":12678,"price":25.04,"value":317457.12,"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 6, 2025"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $25.00 to 25.12, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby\nundertakes 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\ntransaction was effected."}],"balance_after":27569,"source":{"system":"sec-edgar","filing":"0001628280-25-049189","document":"wk-form4_1762307784.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1447362/000162828025049189/wk-form4_1762307784.xml","form_type":"4"}},{"id":1008084,"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":"2025-11-05T01:38:01.000Z","date":"2025-08-27","kind":"sale","planned":false,"acquired":false,"shares":18007,"price":21.69,"value":390571.83,"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 $21.24 to $21.94, 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":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On August 29, 2025, the Reporting Person filed a Form 4 which inadvertently reported that shares were sold by the Reporting Person directly.  In fact, as reported in this amendment, the shares were sold by the Fritz Shorter Trust (the \"Trust\").  The original Form 4 also mistakenly indicated the wrong number of shares held by the Reporting Person directly and indirectly through the Trust. In fact, following this sale, the Reporting Person held 52,924 shares of common stock directly and 100,937 shares of common stock indirectly through the Trust. 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The price reported above reflects the weighted-average sale price. 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