Insider · CIK 0001239501

MAETZOLD DEREK J

Reports to the SEC for 2 companies · FRIENDSWOOD, TX

sec.gov

Transactions

Companies

Filings

CIK

0001239501

Forms 4 and 5

Insider transactions

50 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2026-10-05	CSTLCASTLE BIOSCIENCES INC · Stock option (right to buy)M Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	−8,165 sh	—	—	0
2026-10-05	CSTLCASTLE BIOSCIENCES INCM Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	+8,165 sh	$2.39	+$19.5K	29,644
2026-10-05	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−3,198 sh	$35.57	−$114K	8,038
2026-10-05	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,718 sh	$35.57	−$96.7K	6,832
2026-10-05	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−8,580 sh	$35.57	−$305K	21,064
2026-09-21	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,718 sh	$35.33	−$96K	9,550
2026-09-21	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−8,580 sh	$35.33	−$303K	21,479
2026-09-21	CSTLCASTLE BIOSCIENCES INCM Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	+8,580 sh	$2.39	+$20.5K	30,059
2026-09-21	CSTLCASTLE BIOSCIENCES INC · Stock option (right to buy)M Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	−8,580 sh	—	—	8,165
2026-09-21	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−3,198 sh	$35.33	−$113K	11,236
2026-09-11	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−71 sh	$32.78	−$2,327.38	12,268
2026-09-11	CSTLCASTLE BIOSCIENCES INCM Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	+8,584 sh	$2.39	+$20.5K	30,063
2026-09-11	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−223 sh	$32.78	−$7,309.94	21,479
2026-09-11	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,656 sh	$32.00	−$85K	12,339
2026-09-11	CSTLCASTLE BIOSCIENCES INC · Stock option (right to buy)M Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	−8,584 sh	—	—	16,745
2026-09-11	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−83 sh	$32.78	−$2,720.74	14,434
2026-09-11	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−3,124 sh	$32.00	−$100K	14,517
2026-09-11	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−8,361 sh	$32.00	−$268K	21,702
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−257 sh	$33.14	−$8,516.98	11,277
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−257 sh	$33.14	−$8,516.98	11,277
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−956 sh	$33.88	−$32.4K	21,479
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,505 sh	$33.14	−$83K	17,850
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,129 sh	$33.14	−$70.6K	15,172
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−257 sh	$33.14	−$8,516.98	11,277
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−177 sh	$33.88	−$5,996.76	14,995
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−11.5K sh	$33.14	−$380K	22,435
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−21 sh	$33.88	−$711.48	11,256
2026-08-28	CSTLCASTLE BIOSCIENCES INC · Stock option (right to buy)M Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	−12.4K sh	—	—	25,329
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−21 sh	$33.88	−$711.48	11,256
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−257 sh	$33.14	−$8,516.98	11,277
2026-08-28	CSTLCASTLE BIOSCIENCES INCM Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	+12.4K sh	$2.39	+$29.7K	33,907
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−21 sh	$33.88	−$711.48	11,256
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−209 sh	$33.88	−$7,080.92	17,641
2026-08-28	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−21 sh	$33.88	−$711.48	11,256
2026-08-14	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−278 sh	$30.02	−$8,345.56	11,534
2026-08-14	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−278 sh	$30.02	−$8,345.56	11,534
2026-08-14	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−278 sh	$30.02	−$8,345.56	11,534
2026-08-14	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−278 sh	$30.02	−$8,345.56	11,534
2026-08-14	CSTLCASTLE BIOSCIENCES INCM Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	+1,100 sh	$2.39	+$2,629	22,579
2026-08-14	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−1,100 sh	$30.02	−$33K	21,479
2026-08-14	CSTLCASTLE BIOSCIENCES INC · Stock option (right to buy)M Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	−1,100 sh	—	—	37,757
2026-08-14	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,714 sh	$30.02	−$81.5K	20,355
2026-08-14	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,306 sh	$30.02	−$69.2K	17,301
2026-08-05	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−473 sh	$30.68	−$14.5K	19,607
2026-08-05	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−2,546 sh	$30.68	−$78.1K	21,479
2026-08-05	CSTLCASTLE BIOSCIENCES INC · Stock option (right to buy)M Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	−2,546 sh	—	—	38,857
2026-08-05	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−556 sh	$30.68	−$17.1K	23,069
2026-08-05	CSTLCASTLE BIOSCIENCES INCM Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	+2,546 sh	$2.39	+$6,084.94	24,025
2026-08-04	CSTLCASTLE BIOSCIENCES INCM Exercise/Conversion	Director, Pres. & Chief Exec. Officer	MExercise/Conversion	+20.4K sh	$2.39	+$48.7K	41,835
2026-08-04	CSTLCASTLE BIOSCIENCES INCS Sale	Director, Pres. & Chief Exec. Officer	SSale	−11.9K sh	$31.34	−$374K	21,479

Recent filings

Accepted (ET)
Oct 74
MAETZOLD DEREK J0001628280-26-065327
SEC(opens sec.gov)
Sep 234
MAETZOLD DEREK J0001628280-26-063221
SEC(opens sec.gov)
Sep 154
MAETZOLD DEREK J0001628280-26-062047
SEC(opens sec.gov)
Sep 14
MAETZOLD DEREK J0001628280-26-059816
SEC(opens sec.gov)

Companies

Address

C/O CASTLE BIOSCIENCES, INC. 1500 W. PARKWOOD AVE SUITE 400

FRIENDSWOOD, TX, 77546