Maetzold Derek J — Insider Trades & Holdings | InsiderBid

Maetzold Derek J

Form 4 filings across 1 company. Net figures count open-market buys and sales only. EDGAR profile ↗

Lifetime net: -$12.2M

Positions by company

Reported holding is the most recent post-transaction share count on a Table I row.

Every company this insider has reported trading in, with the value bought and sold at each and the date they last traded.
Ticker	Company	Bought	Sold	Net	Shares held	Last trade
CSTL	Castle Biosciences INC	$0	$12.2M	-$12.2M	9,550	Sep 21

Castle Biosciences INC

-$12.2M

Bought

$0

Sold

$12.2M

Held

9,550

Filing record

How quickly this filer reports. Section 16 allows two business days from the transaction.

1 of 43 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 1 business day late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Company	Past deadline	Largest line	Source
Dec 22, 2025	Dec 28, 2025	CSTLCastle Biosciences INC	1day	$33.5K	Filing ↗

Castle Biosciences INC

1day

Traded Dec 22, 2025 · filed Dec 28, 2025Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays.

Trade history

The 150 most recent Form 4 transactions.

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Ticker	Company	Type	Shares	Price	Value	Δ Own	Filing
Sep 21	CSTL	Castle Biosciences INC	MEXER◷◆	8,580	—	—	—	Open the original filing on SEC.gov
Sep 21	CSTL	Castle Biosciences INC	SSELL◷	2,718	$35.33

CSTLMEXER◷◆—

Castle Biosciences INCSep 21

8,580 sh

CSTLSSELL◷$96K

Castle Biosciences INCSep 21

2,718 sh @ $35.33 · -22.2% own

CSTLSSELL◷$113K

Castle Biosciences INCSep 21

3,198 sh @ $35.33 · -22.2% own

CSTLSSELL◷$303.2K

Castle Biosciences INCSep 21

8,580 sh @ $35.33 · -28.5% own

CSTLMEXER◷$20.5K

Castle Biosciences INCSep 21

8,580 sh @ $2.39 · +40.0% own

CSTLMEXER◷◆—

Castle Biosciences INCSep 11

8,584 sh

CSTLSSELL◷$2.3K

Castle Biosciences INCSep 11

71 sh @ $32.78 · -0.6% own

CSTLSSELL◷$2.7K

Castle Biosciences INCSep 11

83 sh @ $32.78 · -0.6% own

CSTLSSELL◷$7.3K

Castle Biosciences INCSep 11

223 sh @ $32.78 · -1.0% own

CSTLSSELL◷$85K

Castle Biosciences INCSep 11

2,656 sh @ $32.00 · -17.7% own

CSTLSSELL◷$100K

Castle Biosciences INCSep 11

3,124 sh @ $32.00 · -17.7% own

CSTLSSELL◷$267.6K

Castle Biosciences INCSep 11

8,361 sh @ $32.00 · -27.8% own

CSTLMEXER◷$20.5K

Castle Biosciences INCSep 11

8,584 sh @ $2.39 · +40.0% own

CSTLMEXER◷◆—

Castle Biosciences INCAug 28

12,428 sh

CSTLSSELL◷$711

Castle Biosciences INCAug 28

21 sh @ $33.88 · -0.2% own

CSTLSSELL◷$711

Castle Biosciences INCAug 28

21 sh @ $33.88 · -0.2% own

CSTLSSELL◷$711

Castle Biosciences INCAug 28

21 sh @ $33.88 · -0.2% own

CSTLSSELL◷$711

Castle Biosciences INCAug 28

21 sh @ $33.88 · -0.2% own

CSTLSSELL◷$6K

Castle Biosciences INCAug 28

177 sh @ $33.88 · -1.2% own

CSTLSSELL◷$7.1K

Castle Biosciences INCAug 28

209 sh @ $33.88 · -1.2% own

CSTLSSELL◷$32.4K

Castle Biosciences INCAug 28

956 sh @ $33.88 · -4.3% own

CSTLSSELL◷$8.5K

Castle Biosciences INCAug 28

257 sh @ $33.14 · -2.2% own

CSTLSSELL◷$8.5K

Castle Biosciences INCAug 28

257 sh @ $33.14 · -2.2% own

CSTLSSELL◷$8.5K

Castle Biosciences INCAug 28

257 sh @ $33.14 · -2.2% own

CSTLSSELL◷$8.5K

Castle Biosciences INCAug 28

257 sh @ $33.14 · -2.2% own

CSTLSSELL◷$70.6K

Castle Biosciences INCAug 28

2,129 sh @ $33.14 · -12.3% own

CSTLSSELL◷$83K

Castle Biosciences INCAug 28

2,505 sh @ $33.14 · -12.3% own

CSTLSSELL◷$380.2K

Castle Biosciences INCAug 28

11,472 sh @ $33.14 · -33.8% own

CSTLMEXER◷$29.7K

Castle Biosciences INCAug 28

12,428 sh @ $2.39 · +57.9% own

CSTLMEXER◷◆—

Castle Biosciences INCAug 14

1,100 sh

CSTLSSELL◷$8.3K

Castle Biosciences INCAug 14

278 sh @ $30.02 · -2.4% own

CSTLSSELL◷$8.3K

Castle Biosciences INCAug 14

278 sh @ $30.02 · -2.4% own

CSTLSSELL◷$8.3K

Castle Biosciences INCAug 14

278 sh @ $30.02 · -2.4% own

CSTLSSELL◷$8.3K

Castle Biosciences INCAug 14

278 sh @ $30.02 · -2.4% own

CSTLSSELL◷$69.2K

Castle Biosciences INCAug 14

2,306 sh @ $30.02 · -11.8% own

CSTLSSELL◷$81.5K

Castle Biosciences INCAug 14

2,714 sh @ $30.02 · -11.8% own

CSTLSSELL◷$33K

Castle Biosciences INCAug 14

1,100 sh @ $30.02 · -4.9% own

CSTLMEXER◷$2.6K

Castle Biosciences INCAug 14

1,100 sh @ $2.39 · +5.1% own

CSTLMEXER◷◆—

Castle Biosciences INCAug 5

2,546 sh

CSTLSSELL◷$14.5K

Castle Biosciences INCAug 5

473 sh @ $30.68 · -2.4% own

CSTLSSELL◷$17.1K

Castle Biosciences INCAug 5

556 sh @ $30.68 · -2.4% own

CSTLSSELL◷$78.1K

Castle Biosciences INCAug 5

2,546 sh @ $30.68 · -10.6% own

CSTLMEXER◷$6.1K

Castle Biosciences INCAug 5

2,546 sh @ $2.39 · +11.8% own

CSTLMEXER◷◆—

Castle Biosciences INCAug 4

20,356 sh

CSTLSSELL◷$127.3K

Castle Biosciences INCAug 4

4,063 sh @ $31.34 · -16.8% own

CSTLSSELL◷$149.8K

Castle Biosciences INCAug 4

4,782 sh @ $31.34 · -16.8% own

CSTLSSELL◷$374K

Castle Biosciences INCAug 4

11,935 sh @ $31.34 · -35.7% own

CSTLSSELL◷$88.2K

Castle Biosciences INCAug 4

2,866 sh @ $30.79 · -10.6% own

CSTLSSELL◷$103.9K

Castle Biosciences INCAug 4

3,374 sh @ $30.79 · -10.6% own

CSTLSSELL◷$259.3K

Castle Biosciences INCAug 4

8,421 sh @ $30.79 · -20.1% own

CSTLMEXER◷$48.7K

Castle Biosciences INCAug 4

20,356 sh @ $2.39 · +94.8% own

CSTLMEXER◷◆—

Castle Biosciences INCAug 3

10,664 sh

CSTLSSELL◷$109.2K

Castle Biosciences INCAug 3

3,597 sh @ $30.35 · -11.8% own

CSTLSSELL◷$128.5K

Castle Biosciences INCAug 3

4,232 sh @ $30.35 · -11.8% own

CSTLSSELL◷$323.7K

Castle Biosciences INCAug 3

10,664 sh @ $30.35 · -33.2% own

CSTLMEXER◷$25.5K

Castle Biosciences INCAug 3

10,664 sh @ $2.39 · +49.6% own

CSTLMEXER◷◆—

Castle Biosciences INCJul 31

6,480 sh

CSTLSSELL◷$51K

Castle Biosciences INCJul 31

1,690 sh @ $30.15 · -5.2% own

CSTLSSELL◷$59.8K

Castle Biosciences INCJul 31

1,983 sh @ $30.15 · -5.2% own

CSTLSSELL◷$195.4K

Castle Biosciences INCJul 31

6,480 sh @ $30.15 · -23.2% own

CSTLMEXER◷$15.5K

Castle Biosciences INCJul 31

6,480 sh @ $2.39 · +30.2% own

CSTLMEXER◷◆—

Castle Biosciences INCJul 27

6,214 sh

CSTLSSELL◷$251

Castle Biosciences INCJul 27

10 sh @ $25.06 · <0.1% own

CSTLSSELL◷$251

Castle Biosciences INCJul 27

10 sh @ $25.06 · <0.1% own

CSTLSSELL◷$251

Castle Biosciences INCJul 27

10 sh @ $25.06 · <0.1% own

CSTLSSELL◷$251

Castle Biosciences INCJul 27

10 sh @ $25.06 · <0.1% own

CSTLSSELL◷$1.1K

Castle Biosciences INCJul 27

43 sh @ $25.06 · -0.1% own

CSTLSSELL◷$1.3K

Castle Biosciences INCJul 27

50 sh @ $25.06 · -0.1% own

CSTLSSELL◷$5.8K

Castle Biosciences INCJul 27

232 sh @ $25.06 · -1.1% own

CSTLSSELL◷$6.5K

Castle Biosciences INCJul 27

268 sh @ $24.13 · -2.2% own

CSTLSSELL◷$6.5K

Castle Biosciences INCJul 27

268 sh @ $24.13 · -2.2% own

CSTLSSELL◷$6.5K

Castle Biosciences INCJul 27

268 sh @ $24.13 · -2.2% own

CSTLSSELL◷$6.5K

Castle Biosciences INCJul 27

268 sh @ $24.13 · -2.2% own

CSTLSSELL◷$26.8K

Castle Biosciences INCJul 27

1,110 sh @ $24.13 · -3.3% own

CSTLSSELL◷$31.5K

Castle Biosciences INCJul 27

1,307 sh @ $24.13 · -3.3% own

CSTLSSELL◷$144.3K

Castle Biosciences INCJul 27

5,982 sh @ $24.13 · -21.6% own

CSTLMEXER◷$14.9K

Castle Biosciences INCJul 27

6,214 sh @ $2.39 · +28.9% own

CSTLMEXER◷◆—

Castle Biosciences INCJul 14

550 sh

CSTLSSELL◷$6.4K

Castle Biosciences INCJul 14

278 sh @ $22.92 · -2.3% own

CSTLSSELL◷$6.4K

Castle Biosciences INCJul 14

278 sh @ $22.92 · -2.3% own

CSTLSSELL◷$6.4K

Castle Biosciences INCJul 14

278 sh @ $22.92 · -2.3% own

CSTLSSELL◷$6.4K

Castle Biosciences INCJul 14

278 sh @ $22.92 · -2.3% own

CSTLSSELL◷$26.4K

Castle Biosciences INCJul 14

1,153 sh @ $22.92 · -3.3% own

CSTLSSELL◷$31.1K

Castle Biosciences INCJul 14

1,357 sh @ $22.92 · -3.3% own

CSTLSSELL◷$12.6K

Castle Biosciences INCJul 14

550 sh @ $22.92 · -2.5% own

CSTLMEXER◷$1.3K

Castle Biosciences INCJul 14

550 sh @ $2.39 · +2.6% own

CSTLMEXER◷◆—

Castle Biosciences INCJul 1

6,214 sh

CSTLSSELL◷$6.8K

Castle Biosciences INCJul 1

278 sh @ $24.29 · -2.2% own

CSTLSSELL◷$6.8K

Castle Biosciences INCJul 1

278 sh @ $24.29 · -2.2% own

CSTLSSELL◷$6.8K

Castle Biosciences INCJul 1

278 sh @ $24.29 · -2.2% own

CSTLSSELL◷$6.8K

Castle Biosciences INCJul 1

278 sh @ $24.29 · -2.2% own

CSTLSSELL◷$28K

Castle Biosciences INCJul 1

1,153 sh @ $24.29 · -3.2% own

CSTLSSELL◷$33K

Castle Biosciences INCJul 1

1,357 sh @ $24.29 · -3.2% own

CSTLSSELL◷$150.9K

Castle Biosciences INCJul 1

6,214 sh @ $24.29 · -22.4% own

CSTLMEXER◷$14.9K

Castle Biosciences INCJul 1

6,214 sh @ $2.39 · +28.9% own

CSTLMEXER◷◆—

Castle Biosciences INCJun 15

550 sh

CSTLSSELL◷$5.7K

Castle Biosciences INCJun 15

278 sh @ $20.66 · -2.1% own

CSTLSSELL◷$5.7K

Castle Biosciences INCJun 15

278 sh @ $20.66 · -2.1% own

CSTLSSELL◷$5.7K

Castle Biosciences INCJun 15

278 sh @ $20.66 · -2.1% own

CSTLSSELL◷$5.7K

Castle Biosciences INCJun 15

278 sh @ $20.66 · -2.1% own

CSTLSSELL◷$23.8K

Castle Biosciences INCJun 15

1,153 sh @ $20.66 · -3.1% own

CSTLSSELL◷$28K

Castle Biosciences INCJun 15

1,357 sh @ $20.66 · -3.1% own

CSTLSSELL◷$11.4K

Castle Biosciences INCJun 15

550 sh @ $20.66 · -2.5% own

CSTLMEXER◷$1.3K

Castle Biosciences INCJun 15

550 sh @ $2.39 · +2.6% own

CSTLMEXER◷◆—

Castle Biosciences INCJun 1

6,010 sh

CSTLMEXER◷◆—

Castle Biosciences INCJun 1

204 sh

CSTLSSELL◷$5.8K

Castle Biosciences INCJun 1

278 sh @ $20.86 · -14.3% own

CSTLSSELL◷$5.8K

Castle Biosciences INCJun 1

278 sh @ $20.86 · -14.3% own

CSTLSSELL◷$5.8K

Castle Biosciences INCJun 1

278 sh @ $20.86 · -14.3% own

CSTLSSELL◷$5.8K

Castle Biosciences INCJun 1

278 sh @ $20.86 · -14.3% own

CSTLSSELL◷$24K

Castle Biosciences INCJun 1

1,153 sh @ $20.86 · -3.0% own

CSTLSSELL◷$28.3K

Castle Biosciences INCJun 1

1,357 sh @ $20.86 · -3.0% own

CSTLSSELL◷$129.6K

Castle Biosciences INCJun 1

6,214 sh @ $20.86 · -22.4% own

CSTLMEXER◷$14.4K

Castle Biosciences INCJun 1

6,010 sh @ $2.39 · +27.7% own

CSTLMEXER◷$488

Castle Biosciences INCJun 1

204 sh @ $2.39 · +0.9% own

CSTLMEXER◷◆—

Castle Biosciences INCMay 21

420 sh

CSTLSSELL◷$4.3K

Castle Biosciences INCMay 21

212 sh @ $20.20 · -9.8% own

CSTLSSELL◷$4.3K

Castle Biosciences INCMay 21

212 sh @ $20.20 · -9.8% own

CSTLSSELL◷$4.3K

Castle Biosciences INCMay 21

212 sh @ $20.20 · -9.8% own

CSTLSSELL◷$4.3K

Castle Biosciences INCMay 21

212 sh @ $20.20 · -9.8% own

CSTLSSELL◷$17.8K

Castle Biosciences INCMay 21

880 sh @ $20.20 · -2.3% own

CSTLSSELL◷$20.9K

Castle Biosciences INCMay 21

1,035 sh @ $20.20 · -2.3% own

CSTLSSELL◷$8.5K

Castle Biosciences INCMay 21

420 sh @ $20.20 · -1.9% own

CSTLMEXER◷$1K

Castle Biosciences INCMay 21

420 sh @ $2.39 · +2.0% own

CSTLMEXER◷◆—

Castle Biosciences INCMay 20

130 sh

CSTLSSELL◷$1.3K

Castle Biosciences INCMay 20

66 sh @ $20.00 · -3.0% own

CSTLSSELL◷$1.3K

Castle Biosciences INCMay 20

66 sh @ $20.00 · -3.0% own

CSTLSSELL◷$1.3K

Castle Biosciences INCMay 20

66 sh @ $20.00 · -3.0% own

CSTLSSELL◷$1.3K

Castle Biosciences INCMay 20

66 sh @ $20.00 · -3.0% own

CSTLSSELL◷$5.5K

Castle Biosciences INCMay 20

273 sh @ $20.00 · -0.7% own

CSTLSSELL◷$6.4K

Castle Biosciences INCMay 20

322 sh @ $20.00 · -0.7% own

CSTLSSELL◷$2.6K

Castle Biosciences INCMay 20

130 sh @ $20.00 · -0.6% own

CSTLMEXER◷$311

Castle Biosciences INCMay 20

130 sh @ $2.39 · +0.6% own

CSTLMEXER◷◆—

Castle Biosciences INCMay 7

6,214 sh

CSTLSSELL◷$926

Castle Biosciences INCMay 7

41 sh @ $22.59 · -1.8% own

CSTLSSELL◷$926

Castle Biosciences INCMay 7

41 sh @ $22.59 · -1.8% own

CSTLSSELL◷$926

Castle Biosciences INCMay 7

41 sh @ $22.59 · -1.8% own

CSTLSSELL◷$926

Castle Biosciences INCMay 7

41 sh @ $22.59 · -1.8% own

CSTLSSELL◷$3.8K

Castle Biosciences INCMay 7

168 sh @ $22.59 · -0.4% own

CSTLSSELL◷$4.5K

Castle Biosciences INCMay 7

198 sh @ $22.59 · -0.4% own

CSTLSSELL◷$20.5K

Castle Biosciences INCMay 7

906 sh @ $22.59 · -4.0% own

CSTLSSELL◷$5.2K

Castle Biosciences INCMay 7

237 sh @ $22.08 · -9.5% own

CSTLSSELL◷$5.2K

Castle Biosciences INCMay 7

237 sh @ $22.08 · -9.5% own

CSTLSSELL◷$5.2K

Castle Biosciences INCMay 7

237 sh @ $22.08 · -9.5% own

CSTLSSELL◷$5.2K

Castle Biosciences INCMay 7

237 sh @ $22.08 · -9.5% own

CSTLSSELL◷$21.7K

Castle Biosciences INCMay 7

985 sh @ $22.08 · -2.4% own

CSTLSSELL◷$25.6K

Castle Biosciences INCMay 7

1,159 sh @ $22.08 · -2.4% own

CSTLSSELL◷$117.2K

Castle Biosciences INCMay 7

5,308 sh @ $22.08 · -19.2% own

CSTLMEXER◷$14.9K

Castle Biosciences INCMay 7

6,214 sh @ $2.39 · +28.9% own

CSTLMEXER◷◆—

Castle Biosciences INCApr 21

550 sh