Derek J Maetzold Castle Biosciences Inc (CSTL) insider trading activity

Derek J Maetzold is Pres. & Chief Exec. Officer of CASTLE BIOSCIENCES INC. Currently has a direct ownership of 62,988 shares of CSTL, which is worth approximately $1.45 Million. The most recent transaction as insider was on Oct 20, 2025, when has been sold 1,339 shares (Common Stock) at a price of $22.44 per share, resulting in proceeds of $30,047. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 63K

9.61% 3M change

31.28% 12M change

Total Value Held $1.45 Million

DEREK J MAETZOLD Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Oct 20 2025	SELL Open market or private sale	$30,047 $22.44 p/Share	1,339 Reduced 2.08%	62,988 Common Stock
Oct 02 2025	SELL Open market or private sale	$30,234 $22.58 p/Share	1,339 Reduced 2.04%	64,327 Common Stock
Sep 17 2025	SELL Open market or private sale	$29,417 $21.97 p/Share	1,339 Reduced 2.0%	65,666 Common Stock
Sep 02 2025	SELL Open market or private sale	$32,042 $23.93 p/Share	1,339 Reduced 1.96%	67,005 Common Stock
Aug 15 2025	SELL Open market or private sale	$26,833 $20.04 p/Share	1,339 Reduced 1.92%	68,344 Common Stock
Aug 13 2025	SELL Open market or private sale	$838,870 $19.5 p/Share	43,019 Reduced 38.17%	69,683 Common Stock
Aug 08 2025	SELL Payment of exercise price or tax liability	$464,097 $19.36 p/Share	23,972 Reduced 17.54%	112,702 Common Stock
Aug 08 2025	BUY Exercise of conversion of derivative security	-	66,991 Added 32.89%	136,674 Common Stock
Jun 27 2025	SELL Open market or private sale	$100,363 $20.3 p/Share	4,944 Reduced 6.62%	69,683 Common Stock
Apr 21 2025	SELL Open market or private sale	$26,598 $21.52 p/Share	1,236 Reduced 1.63%	74,627 Common Stock
Apr 09 2025	SELL Open market or private sale	$20,685 $20.22 p/Share	1,023 Reduced 1.33%	75,863 Common Stock
Apr 08 2025	SELL Open market or private sale	$4,266 $20.03 p/Share	213 Reduced 0.28%	76,886 Common Stock
Mar 26 2025	SELL Open market or private sale	$25,090 $20.3 p/Share	1,236 Reduced 1.58%	77,099 Common Stock
Mar 10 2025	SELL Open market or private sale	$41,577 $19.52 p/Share	2,130 Reduced 2.65%	78,335 Common Stock
Mar 07 2025	SELL Open market or private sale	$461,835 $20.4 p/Share	22,639 Reduced 21.96%	80,465 Common Stock
Mar 04 2025	SELL Open market or private sale	$26,012 $20.86 p/Share	1,247 Reduced 1.2%	103,104 Common Stock
Mar 04 2025	SELL Payment of exercise price or tax liability	$168,414 $22.23 p/Share	7,576 Reduced 6.77%	104,351 Common Stock
Mar 04 2025	BUY Exercise of conversion of derivative security	-	31,109 Added 21.75%	111,927 Common Stock
Jan 13 2025	SELL Open market or private sale	$28,150 $28.55 p/Share	986 Reduced 1.21%	80,818 Common Stock
Jan 07 2025	SELL Open market or private sale	$7,324 $30.14 p/Share	243 Reduced 0.3%	81,804 Common Stock
Jan 06 2025	SELL Open market or private sale	$79,386 $29.24 p/Share	2,715 Reduced 3.2%	82,047 Common Stock
Dec 17 2024	SELL Open market or private sale	$267,342 $28.55 p/Share	9,364 Reduced 9.95%	84,762 Common Stock
Dec 16 2024	SELL Open market or private sale	$318,830 $28.83 p/Share	11,059 Reduced 10.51%	94,126 Common Stock
Dec 13 2024	SELL Open market or private sale	$388,637 $28.82 p/Share	13,485 Reduced 11.36%	105,185 Common Stock
Dec 10 2024	SELL Payment of exercise price or tax liability	$242,373 $29.63 p/Share	8,180 Reduced 6.45%	118,670 Common Stock

DJM

Derek J Maetzold

Pres. & Chief Exec. Officer

Friendswood, TX

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