Maetzold Derek J: insider trades.
Maetzold Derek J reported 84 non-derivative transactions on 9 SEC ownership filings in Q3 2026: 0 open-market purchases and 73 sales ($4.5M), across 1 company.
- Transactions
- 84
- Purchases (P)
- 0
- Sales (S)
- 73
- Companies
- 1
- Name as filed
- MAETZOLD DEREK J
Companies
| Company | Relationship | Transactions |
|---|---|---|
| Castle Biosciences Inc (CSTL) | Director, Officer · Pres. & Chief Exec. Officer | 84 |
Transactions
| Date | Company | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| 2026-09-21 | Castle Biosciences Inc | S | 2,718 | $35.33 | 9,550 | Form 4 |
| 2026-09-21 | Castle Biosciences Inc | S | 3,198 | $35.33 | 11,236 | Form 4 |
| 2026-09-21 | Castle Biosciences Inc | M | 8,580 | $2.39 | 30,059 | Form 4 |
| 2026-09-21 | Castle Biosciences Inc | S | 8,580 | $35.33 | 21,479 | Form 4 |
| 2026-09-11 | Castle Biosciences Inc | M | 8,584 | $2.39 | 30,063 | Form 4 |
| 2026-09-11 | Castle Biosciences Inc | S | 8,361 | $32 | 21,702 | Form 4 |
| 2026-09-11 | Castle Biosciences Inc | S | 3,124 | $32 | 14,517 | Form 4 |
| 2026-09-11 | Castle Biosciences Inc | S | 2,656 | $32 | 12,339 | Form 4 |
| 2026-09-11 | Castle Biosciences Inc | S | 71 | $32.78 | 12,268 | Form 4 |
| 2026-09-11 | Castle Biosciences Inc | S | 83 | $32.78 | 14,434 | Form 4 |
| 2026-09-11 | Castle Biosciences Inc | S | 223 | $32.78 | 21,479 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 2,505 | $33.14 | 17,850 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 2,129 | $33.14 | 15,172 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 257 | $33.14 | 11,277 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 257 | $33.14 | 11,277 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 21 | $33.88 | 11,256 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 257 | $33.14 | 11,277 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 956 | $33.88 | 21,479 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 209 | $33.88 | 17,641 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 177 | $33.88 | 14,995 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 21 | $33.88 | 11,256 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 21 | $33.88 | 11,256 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 21 | $33.88 | 11,256 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 11,472 | $33.14 | 22,435 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | M | 12,428 | $2.39 | 33,907 | Form 4 |
| 2026-08-28 | Castle Biosciences Inc | S | 257 | $33.14 | 11,277 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | M | 1,100 | $2.39 | 22,579 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | S | 1,100 | $30.02 | 21,479 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | S | 2,714 | $30.02 | 20,355 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | S | 2,306 | $30.02 | 17,301 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | S | 278 | $30.02 | 11,534 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | S | 278 | $30.02 | 11,534 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | S | 278 | $30.02 | 11,534 | Form 4 |
| 2026-08-14 | Castle Biosciences Inc | S | 278 | $30.02 | 11,534 | Form 4 |
| 2026-08-05 | Castle Biosciences Inc | M | 2,546 | $2.39 | 24,025 | Form 4 |
| 2026-08-05 | Castle Biosciences Inc | S | 2,546 | $30.68 | 21,479 | Form 4 |
| 2026-08-05 | Castle Biosciences Inc | S | 556 | $30.68 | 23,069 | Form 4 |
| 2026-08-05 | Castle Biosciences Inc | S | 473 | $30.68 | 19,607 | Form 4 |
| 2026-08-04 | Castle Biosciences Inc | S | 11,935 | $31.34 | 21,479 | Form 4 |
| 2026-08-04 | Castle Biosciences Inc | S | 4,782 | $31.34 | 23,625 | Form 4 |
| 2026-08-04 | Castle Biosciences Inc | S | 4,063 | $31.34 | 20,080 | Form 4 |
| 2026-08-04 | Castle Biosciences Inc | S | 2,866 | $30.79 | 24,143 | Form 4 |
| 2026-08-04 | Castle Biosciences Inc | S | 3,374 | $30.79 | 28,407 | Form 4 |
| 2026-08-04 | Castle Biosciences Inc | S | 8,421 | $30.79 | 33,414 | Form 4 |
| 2026-08-04 | Castle Biosciences Inc | M | 20,356 | $2.39 | 41,835 | Form 4 |
| 2026-08-03 | Castle Biosciences Inc | S | 4,232 | $30.35 | 31,781 | Form 4 |
| 2026-08-03 | Castle Biosciences Inc | S | 10,664 | $30.35 | 21,479 | Form 4 |
| 2026-08-03 | Castle Biosciences Inc | M | 10,664 | $2.39 | 32,143 | Form 4 |
| 2026-08-03 | Castle Biosciences Inc | S | 3,597 | $30.35 | 27,009 | Form 4 |
| 2026-07-31 | Castle Biosciences Inc | S | 1,690 | $30.15 | 30,606 | Form 4 |
| 2026-07-31 | Castle Biosciences Inc | M | 6,480 | $2.39 | 27,959 | Form 4 |
| 2026-07-31 | Castle Biosciences Inc | S | 6,480 | $30.15 | 21,479 | Form 4 |
| 2026-07-31 | Castle Biosciences Inc | S | 1,983 | $30.15 | 36,013 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 43 | $25.06 | 32,296 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 10 | $25.06 | 11,812 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 10 | $25.06 | 11,812 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 10 | $25.06 | 11,812 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 10 | $25.06 | 11,812 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | M | 6,214 | $2.39 | 27,693 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 5,982 | $24.13 | 21,711 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 1,307 | $24.13 | 38,046 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 1,110 | $24.13 | 32,339 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 268 | $24.13 | 11,822 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 268 | $24.13 | 11,822 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 268 | $24.13 | 11,822 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 268 | $24.13 | 11,822 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 232 | $25.06 | 21,479 | Form 4 |
| 2026-07-27 | Castle Biosciences Inc | S | 50 | $25.06 | 37,996 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | M | 550 | $2.39 | 22,029 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | S | 550 | $22.92 | 21,479 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | S | 1,357 | $22.92 | 39,353 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | S | 278 | $22.92 | 12,090 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | S | 278 | $22.92 | 12,090 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | S | 278 | $22.92 | 12,090 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | S | 278 | $22.92 | 12,090 | Form 4 |
| 2026-07-14 | Castle Biosciences Inc | S | 1,153 | $22.92 | 33,449 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | S | 1,357 | $24.29 | 40,710 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | S | 1,153 | $24.29 | 34,602 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | S | 278 | $24.29 | 12,368 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | S | 6,214 | $24.29 | 21,479 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | M | 6,214 | $2.39 | 27,693 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | S | 278 | $24.29 | 12,368 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | S | 278 | $24.29 | 12,368 | Form 4 |
| 2026-07-01 | Castle Biosciences Inc | S | 278 | $24.29 | 12,368 | Form 4 |
Questions
What stock did Maetzold Derek J buy or sell?
Maetzold Derek J reported 84 non-derivative transactions on 9 SEC ownership filings in Q3 2026: 0 open-market purchases and 73 sales ($4.5M), across 1 company.
Is Maetzold Derek J the same person as other filers with this name?
This page covers SEC CIK 1239501 only. The SEC assigns each reporting owner a CIK, and people with the same name have different CIKs.
Source: SEC Insider Transactions Data Sets, Q3 2026. Reported as filed; we do not assess intent, performance or compliance. All filings for this CIK on SEC.gov.
Plain-text version for agents and LLMs: /insiders/maetzold-derek-j-1239501.md
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