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 33,530 shares of CSTL, which is worth approximately $1.12 Million. The most recent transaction as insider was on Dec 22, 2025, when has been sold 830 shares (Common Stock) at a price of $40.35 per share, resulting in proceeds of $33,490. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 33.5K

47.88% 3M change

60.44% 12M change

Total Value Held $1.12 Million

DEREK J MAETZOLD Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Dec 22 2025	SELL Open market or private sale	$33,490 $40.35 p/Share	830 Reduced 2.42%	33,530 Common Stock
Dec 17 2025	SELL Open market or private sale	$20,380 $40.04 p/Share	509 Reduced 1.46%	34,360 Common Stock
Dec 16 2025	SELL Open market or private sale	$494,249 $38.55 p/Share	12,821 Reduced 26.88%	34,869 Common Stock
Dec 15 2025	SELL Open market or private sale	$762,060 $39.03 p/Share	19,525 Reduced 29.05%	47,690 Common Stock
Dec 10 2025	SELL Payment of exercise price or tax liability	$230,781 $38.02 p/Share	6,070 Reduced 8.28%	67,215 Common Stock
Dec 10 2025	BUY Exercise of conversion of derivative security	-	15,424 Added 17.39%	73,285 Common Stock
Dec 09 2025	SELL Payment of exercise price or tax liability	$504,173 $38.25 p/Share	13,181 Reduced 18.55%	57,861 Common Stock

Dec 09 2025	BUY Exercise of conversion of derivative security	-	33,495 Added 32.04%	71,042 Common Stock
Dec 04 2025	SELL Open market or private sale	$53,600 $40.03 p/Share	1,339 Reduced 3.44%	37,547 Common Stock
Dec 02 2025	SELL Open market or private sale	$105,057 $39.23 p/Share	2,678 Reduced 6.44%	38,886 Common Stock
Nov 26 2025	SELL Open market or private sale	$170,703 $40.09 p/Share	4,258 Reduced 9.29%	41,564 Common Stock
Nov 25 2025	SELL Open market or private sale	$204,855 $40.05 p/Share	5,115 Reduced 10.04%	45,822 Common Stock
Nov 18 2025	SELL Open market or private sale	$91,105 $34.02 p/Share	2,678 Reduced 4.99%	50,937 Common Stock
Nov 05 2025	SELL Open market or private sale	$85,294 $31.85 p/Share	2,678 Reduced 4.76%	53,615 Common Stock
Nov 04 2025	SELL Open market or private sale	$206,005 $30.77 p/Share	6,695 Reduced 10.63%	56,293 Common Stock
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

DJM

Derek J Maetzold

Pres. & Chief Exec. Officer

Friendswood, TX

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