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CASTLE BIOSCIENCES INC

CSTL Net selling
CIK 0001447362 #2535 in the set updated 17 Sep 2026
Bought (120 mo)
$12.52M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$414.54M
$24.76M on a plan · $16.21M straight out of an exercise
Sold at will
$373.56M
1480 of 2336 sales
Net
−$402.01M
−$361.03M against sales at will

By person

19 insiders · 2,375 transactions
24.0×

Derek J. Maetzold holds 24.0 times base salary in stock. $18.08M of shares against $751.35K in salary for 2025.

Salary from the company's own proxy. The shares are what Derek J. Maetzold last reported holding, valued at $35.14, the price Common Stock was last bought or sold at on the open market here, on 15 Sep 2026.

Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
BRADBURY DANIEL
Director
—
$160.28M (453)
−$160.28M
588,918
1.93%
$20.70M
+6.4%
MAETZOLD DEREK J
Pres. & Chief Exec. Officer
—
$95.16M (1594)
−$95.16M
514,505
1.68%
$18.08M
−75.2%
KABAKOFF DAVID S
Director
$1.00M (1)
$64.36M (38)
−$63.36M
503,577
1.65%
$17.70M
—
Cook Joseph C. III
Director
$5.36M (2)
$53.23M (136)
−$47.87M
125,124
0.4096%
$4.40M
—
Sofinnova HealthQuest Partners, L.P. entity
10% owner
$1.00M (1)
$13.28M (8)
−$12.28M
1,433,577
4.69%
$50.38M
—
Spiess Bernhard E.
Chief Business Officer
—
$8.59M (12)
−$8.59M
14,696
0.0481%
$516.45K
−87.9%
Stokes Frank
Chief Financial Officer
—
$8.43M (34) scheduled
−$8.43M
35,177
0.1151%
$1.24M
+290.3%
Oelschlager Kristen M
Chief Operating Officer
—
$5.16M (24) scheduled
−$5.16M
158,654
0.5193%
$5.58M
−14.6%
MGC Venture Partners 2013 GP, LLC entity
10% owner
$5.00M (3)
$1.21M (5)
+$3.79M
134,700
0.4409%
$4.73M
—
Juvenal Tobin W
Chief Commercial Officer
—
$3.52M (19) scheduled
−$3.52M
60,814
0.1991%
$2.14M
+562.8%
Anderson Bonnie H
Director
—
$601.40K (7)
−$601.40K
45,353
0.1485%
$1.59M
−4.0%
Aspinall Mara G.
Director
$50.00K (1)
$494.80K (4)
−$444.80K
44,139
0.1445%
$1.55M
+86.8%
Cole G Bradley
Director
—
$210.73K (2) scheduled
−$210.73K
32,976
0.1079%
$1.16M
—
Goldberg Ellen
Director
$69.00K (2)
—
+$69.00K
40,921
0.1339%
$1.44M
—
Olson Tiffany
Director
$49.75K (3)
—
+$49.75K
39,573
0.1295%
$1.39M
—
Caple Kim
Director
—
—
—
36,121
0.1182%
$1.27M
—
Harrison Miles
Director
—
—
—
35,631
0.1166%
$1.25M
—
Cotton Rodney
Director
—
—
—
32,998
0.1080%
$1.16M
—
Monzon Federico A.
Chief Medical Officer
—
—
—
31,459
0.1030%
$1.11M
+174.5%

Individual transactions

95
Insider
Date
Role
Action
Shares
Price
Amount
Juvenal Tobin W
15 Sep 2026
Chief Commercial Officer
Sold on a plan
3,294
$35.14
$115.76K
Juvenal Tobin W
14 Sep 2026
Chief Commercial Officer
Sold on a plan
3,306
$32.32
$106.86K
Juvenal Tobin W
31 Aug 2026
Chief Commercial Officer
Sold on a plan
1,730
$32.81
$56.76K
Juvenal Tobin W
25 Aug 2026
Chief Commercial Officer
Sold on a plan
9,050
$35.04
$317.11K
Juvenal Tobin W
17 Aug 2026
Chief Commercial Officer
Sold on a plan
1,730
$29.59
$51.19K
Juvenal Tobin W
3 Aug 2026
Chief Commercial Officer
Sold on a plan
1,730
$28.25
$48.87K
Oelschlager Kristen M
3 Aug 2026
Chief Operating Officer
Sold on a plan
1,100
$30.62
$33.68K
Oelschlager Kristen M
3 Aug 2026
Chief Operating Officer
Sold on a plan
4,486
$30.00
$134.58K
Oelschlager Kristen M
3 Aug 2026
Chief Operating Officer
Sold on a plan
3,000
$29.12
$87.36K
Juvenal Tobin W
31 Jul 2026
Chief Commercial Officer
Sold on a plan
1,891
$30.26
$57.23K
Juvenal Tobin W
31 Jul 2026
Chief Commercial Officer
Sold on a plan
7,270
$29.58
$215.04K
Juvenal Tobin W
31 Jul 2026
Chief Commercial Officer
Sold on a plan
8,149
$28.84
$235.03K
Oelschlager Kristen M
1 Jul 2026
Chief Operating Officer
Sold on a plan
400
$24.78
$9.91K
Oelschlager Kristen M
1 Jul 2026
Chief Operating Officer
Sold on a plan
8,186
$24.40
$199.74K
Oelschlager Kristen M
16 Jun 2026
Chief Operating Officer
Sold on a plan
8,587
$20.71
$177.84K
MAETZOLD DEREK J
18 Mar 2026
Pres. & Chief Exec. Officer
Sold on a plan
650
$25.39
$16.50K
MAETZOLD DEREK J
17 Mar 2026
Pres. & Chief Exec. Officer
Sold on a plan
18,650
$25.93
$483.59K
MAETZOLD DEREK J
16 Mar 2026
Pres. & Chief Exec. Officer
Sold on a plan
126
$26.68
$3.36K
MAETZOLD DEREK J
16 Mar 2026
Pres. & Chief Exec. Officer
Sold on a plan
17,449
$25.96
$453.05K
MAETZOLD DEREK J
13 Mar 2026
Pres. & Chief Exec. Officer
Sold on a plan
13,204
$25.45
$336.00K
MAETZOLD DEREK J
12 Mar 2026
Pres. & Chief Exec. Officer
Sold on a plan
23,179
$25.28
$585.94K
Juvenal Tobin W
12 Mar 2026
Chief Commercial Officer
Sold on a plan
20,863
$25.24
$526.58K
Stokes Frank
5 Mar 2026
Chief Financial Officer
Sold on a plan
6,001
$27.98
$167.91K
Stokes Frank
3 Mar 2026
Chief Financial Officer
Sold on a plan
1,700
$27.81
$47.28K
Stokes Frank
3 Mar 2026
Chief Financial Officer
Sold on a plan
5,300
$27.32
$144.80K
MAETZOLD DEREK J
4 Feb 2026
Pres. & Chief Exec. Officer
Sold on a plan
171
$38.61
$6.60K
MAETZOLD DEREK J
4 Feb 2026
Pres. & Chief Exec. Officer
Sold on a plan
646
$37.82
$24.43K
MAETZOLD DEREK J
3 Feb 2026
Pres. & Chief Exec. Officer
Sold on a plan
3,200
$39.91
$127.72K
MAETZOLD DEREK J
20 Jan 2026
Pres. & Chief Exec. Officer
Sold on a plan
4,017
$40.01
$160.73K
MAETZOLD DEREK J
6 Jan 2026
Pres. & Chief Exec. Officer
Sold on a plan
1,339
$40.10
$53.69K
MAETZOLD DEREK J
5 Jan 2026
Pres. & Chief Exec. Officer
Sold on a plan
2,678
$38.09
$102.01K
MAETZOLD DEREK J
22 Dec 2025
Pres. & Chief Exec. Officer
Sold on a plan
830
$40.35
$33.49K
MAETZOLD DEREK J
17 Dec 2025
Pres. & Chief Exec. Officer
Sold on a plan
509
$40.04
$20.38K
MAETZOLD DEREK J
16 Dec 2025
Pres. & Chief Exec. Officer
Sold on a plan
12,821
$38.55
$494.30K
MAETZOLD DEREK J
15 Dec 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,012
$39.30
$39.78K
MAETZOLD DEREK J
15 Dec 2025
Pres. & Chief Exec. Officer
Sold on a plan
18,513
$38.75
$717.32K
MAETZOLD DEREK J
4 Dec 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,339
$40.03
$53.60K
MAETZOLD DEREK J
2 Dec 2025
Pres. & Chief Exec. Officer
Sold on a plan
2,678
$39.23
$105.06K
MAETZOLD DEREK J
26 Nov 2025
Pres. & Chief Exec. Officer
Sold on a plan
4,258
$40.09
$170.70K
MAETZOLD DEREK J
25 Nov 2025
Pres. & Chief Exec. Officer
Sold on a plan
5,115
$40.05
$204.85K
Juvenal Tobin W
24 Nov 2025
Chief Commercial Officer
Sold on a plan
1,301
$38.39
$49.95K
MAETZOLD DEREK J
18 Nov 2025
Pres. & Chief Exec. Officer
Sold on a plan
2,678
$34.02
$91.11K
Juvenal Tobin W
12 Nov 2025
Chief Commercial Officer
Sold on a plan
200
$35.40
$7.08K
Oelschlager Kristen M
11 Nov 2025
Chief Operating Officer
Sold on a plan
18,932
$35.10
$664.51K
Juvenal Tobin W
11 Nov 2025
Chief Commercial Officer
Sold on a plan
500
$35.39
$17.70K
Stokes Frank
11 Nov 2025
Chief Financial Officer
Sold on a plan
5,388
$35.08
$189.01K
MAETZOLD DEREK J
5 Nov 2025
Pres. & Chief Exec. Officer
Sold on a plan
2,678
$31.85
$85.30K
MAETZOLD DEREK J
4 Nov 2025
Pres. & Chief Exec. Officer
Sold on a plan
237
$31.12
$7.37K
MAETZOLD DEREK J
4 Nov 2025
Pres. & Chief Exec. Officer
Sold on a plan
6,458
$30.41
$196.41K
Oelschlager Kristen M
31 Oct 2025
Chief Operating Officer
Sold on a plan
12,678
$25.04
$317.46K
MAETZOLD DEREK J
20 Oct 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,339
$22.44
$30.05K
MAETZOLD DEREK J
2 Oct 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,339
$22.58
$30.23K
MAETZOLD DEREK J
17 Sep 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,339
$21.97
$29.42K
MAETZOLD DEREK J
2 Sep 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,339
$23.93
$32.04K
Oelschlager Kristen M
27 Aug 2025
Chief Operating Officer
Sold on a plan
12,677
$22.02
$279.13K
MAETZOLD DEREK J
15 Aug 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,339
$20.04
$26.83K
MAETZOLD DEREK J
13 Aug 2025
Pres. & Chief Exec. Officer
Sold on a plan
43,019
$19.50
$839.04K
MAETZOLD DEREK J
27 Jun 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
660
$20.30
$13.40K
MAETZOLD DEREK J
27 Jun 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
660
$20.30
$13.40K
MAETZOLD DEREK J
27 Jun 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
660
$20.30
$13.40K
MAETZOLD DEREK J
27 Jun 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
660
$20.30
$13.40K
MAETZOLD DEREK J
27 Jun 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
6,924
$20.30
$140.56K
MAETZOLD DEREK J
27 Jun 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
8,068
$20.30
$163.78K
MAETZOLD DEREK J
27 Jun 2025
Pres. & Chief Exec. Officer
Sold on a plan
4,944
$20.30
$100.36K
MAETZOLD DEREK J
21 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$21.52
$3.55K
MAETZOLD DEREK J
21 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$21.52
$3.55K
MAETZOLD DEREK J
21 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$21.52
$3.55K
MAETZOLD DEREK J
21 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$21.52
$3.55K
MAETZOLD DEREK J
21 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
1,731
$21.52
$37.25K
MAETZOLD DEREK J
21 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
2,017
$21.52
$43.40K
MAETZOLD DEREK J
21 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,236
$21.52
$26.60K
MAETZOLD DEREK J
9 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
137
$20.22
$2.77K
MAETZOLD DEREK J
9 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
137
$20.22
$2.77K
MAETZOLD DEREK J
9 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
137
$20.22
$2.77K
MAETZOLD DEREK J
9 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
135
$20.22
$2.73K
MAETZOLD DEREK J
9 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
1,432
$20.22
$28.95K
MAETZOLD DEREK J
9 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
1,669
$20.22
$33.75K
MAETZOLD DEREK J
9 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,023
$20.22
$20.68K
MAETZOLD DEREK J
8 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
28
$20.03
$560.84
MAETZOLD DEREK J
8 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
28
$20.03
$560.84
MAETZOLD DEREK J
8 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
28
$20.03
$560.84
MAETZOLD DEREK J
8 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
30
$20.03
$600.90
MAETZOLD DEREK J
8 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
299
$20.03
$5.99K
MAETZOLD DEREK J
8 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
348
$20.03
$6.97K
MAETZOLD DEREK J
8 Apr 2025
Pres. & Chief Exec. Officer
Sold on a plan
213
$20.03
$4.27K
MAETZOLD DEREK J
26 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$20.30
$3.35K
MAETZOLD DEREK J
26 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$20.30
$3.35K
MAETZOLD DEREK J
26 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$20.30
$3.35K
MAETZOLD DEREK J
26 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
165
$20.30
$3.35K
MAETZOLD DEREK J
26 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
1,731
$20.30
$35.14K
MAETZOLD DEREK J
26 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
2,017
$20.30
$40.95K
MAETZOLD DEREK J
26 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan
1,236
$20.30
$25.09K
MAETZOLD DEREK J
10 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan
2,130
$19.52
$41.57K
MAETZOLD DEREK J
7 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
15
$20.74
$311.16
MAETZOLD DEREK J
7 Mar 2025
Pres. & Chief Exec. Officer
Sold on a plan indirect
15
$20.74
$311.16
Showing 250 of 2,375 transactions. The figures above use every one of them.

What was left out

Form 4 filings counted 538
Amendments (4/A) skipped 9
Filings about a different issuer 0
Unreadable filings 0
Joint filings 10
Sales on a Rule 10b5-1 plan 669
Sales straight out of an exercise 187
Sales at will 1,480
Transactions with no price 0
Shares from compensation/vesting 9,993,449
Sales filed before the plan box existed 1,384
History held since 31 Jul 2019