Maetzold Derek J insider trades
Maetzold Derek J has filed 143 Form 4s with the SEC that we hold, all for Castle Biosciences INC (CSTL), as Pres. & Chief Exec. Officer, Director. Across all of them we count 0 purchases worth $0 and 823 sales worth $39.7M reported on Form 4. In the last 12 months: 0 purchases ($0) and 122 sales ($10.9M). The largest single trade was a sale of 43,019 shares of Castle Biosciences INC worth $838.9K, dated 2025-08-13. Of 20 sales filed since we began reading the 10b5-1 checkbox, 20 (100%) were marked as made under a 10b5-1 trading plan. The first filing on our record is dated 2021-07-09 and the latest 2026-10-07.
Castle Biosciences INC (CSTL)
Pres. & Chief Exec. Officer, Director · 143 filings · 823 purchases and sales
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2021-07-07 | S, sale reported on Form 4 | 5,946 | $414.4K | 2021-07-09 |
| 2021-07-07 | S, sale reported on Form 4 | 3,354 | $236.1K | 2021-07-09 |
| 2021-07-07 | S, sale reported on Form 4 | 700 | $50.0K | 2021-07-09 |
| 2021-07-08 | S, sale reported on Form 4 | 700 | $49.7K | 2021-07-09 |
| 2021-07-08 | S, sale reported on Form 4 | 2,599 | $177.8K | 2021-07-09 |
| 2021-07-08 | S, sale reported on Form 4 | 1,597 | $111.0K | 2021-07-09 |
| 2021-07-08 | S, sale reported on Form 4 | 4,504 | $316.7K | 2021-07-09 |
| 2021-07-08 | S, sale reported on Form 4 | 600 | $40.0K | 2021-07-09 |
| 2021-07-09 | S, sale reported on Form 4 | 1,010 | $72.6K | 2021-07-12 |
| 2021-07-09 | S, sale reported on Form 4 | 1,190 | $83.8K | 2021-07-12 |
| 2021-07-09 | S, sale reported on Form 4 | 3,100 | $227.7K | 2021-07-12 |
| 2021-07-09 | S, sale reported on Form 4 | 4,700 | $341.5K | 2021-07-12 |
| 2021-07-19 | S, sale reported on Form 4 | 9,430 | $609.1K | 2021-07-21 |
| 2021-07-19 | S, sale reported on Form 4 | 570 | $37.1K | 2021-07-21 |
| 2021-07-19 | S, sale reported on Form 4 | 833 | $53.8K | 2021-07-21 |
| 2021-07-19 | S, sale reported on Form 4 | 834 | $53.9K | 2021-07-21 |
| 2021-07-20 | S, sale reported on Form 4 | 522 | $34.3K | 2021-07-21 |
| 2021-07-20 | S, sale reported on Form 4 | 200 | $13.4K | 2021-07-21 |
| 2021-07-20 | S, sale reported on Form 4 | 311 | $20.7K | 2021-07-21 |
| 2021-07-20 | S, sale reported on Form 4 | 521 | $34.2K | 2021-07-21 |
| 2021-07-20 | S, sale reported on Form 4 | 312 | $20.8K | 2021-07-21 |
| 2021-07-20 | S, sale reported on Form 4 | 4,283 | $284.6K | 2021-07-21 |
| 2021-07-20 | S, sale reported on Form 4 | 5,517 | $361.7K | 2021-07-21 |
| 2021-07-21 | S, sale reported on Form 4 | 166 | $11.0K | 2021-07-23 |
| 2021-07-21 | S, sale reported on Form 4 | 167 | $11.3K | 2021-07-23 |
| 2021-07-21 | S, sale reported on Form 4 | 500 | $34.3K | 2021-07-23 |
| 2021-07-21 | S, sale reported on Form 4 | 2,125 | $141.4K | 2021-07-23 |
| 2021-07-21 | S, sale reported on Form 4 | 1,900 | $128.8K | 2021-07-23 |
| 2021-07-21 | S, sale reported on Form 4 | 5,975 | $410.4K | 2021-07-23 |
| 2021-07-21 | S, sale reported on Form 4 | 167 | $11.1K | 2021-07-23 |
| 2021-07-21 | S, sale reported on Form 4 | 166 | $11.2K | 2021-07-23 |
| 2021-07-30 | S, sale reported on Form 4 | 703 | $49.3K | 2021-08-03 |
| 2021-07-30 | S, sale reported on Form 4 | 704 | $49.4K | 2021-08-03 |
| 2021-08-02 | S, sale reported on Form 4 | 456 | $32.0K | 2021-08-03 |
| 2021-08-02 | S, sale reported on Form 4 | 457 | $32.1K | 2021-08-03 |
| 2021-08-03 | S, sale reported on Form 4 | 1,340 | $94.3K | 2021-08-06 |
| 2021-08-13 | S, sale reported on Form 4 | 624 | $40.4K | 2021-08-17 |
| 2021-08-13 | S, sale reported on Form 4 | 209 | $13.7K | 2021-08-17 |
| 2021-08-13 | S, sale reported on Form 4 | 210 | $13.8K | 2021-08-17 |
| 2021-08-13 | S, sale reported on Form 4 | 2,525 | $165.8K | 2021-08-17 |
| 2021-08-13 | S, sale reported on Form 4 | 7,475 | $483.9K | 2021-08-17 |
| 2021-08-16 | S, sale reported on Form 4 | 3,051 | $185.5K | 2021-08-17 |
| 2021-08-16 | S, sale reported on Form 4 | 6,144 | $378.8K | 2021-08-17 |
| 2021-08-16 | S, sale reported on Form 4 | 805 | $50.2K | 2021-08-17 |
| 2021-08-16 | S, sale reported on Form 4 | 567 | $34.7K | 2021-08-17 |
| 2021-08-16 | S, sale reported on Form 4 | 267 | $16.6K | 2021-08-17 |
| 2021-08-16 | S, sale reported on Form 4 | 566 | $34.6K | 2021-08-17 |
| 2021-08-16 | S, sale reported on Form 4 | 266 | $16.5K | 2021-08-17 |
| 2021-08-17 | S, sale reported on Form 4 | 2,699 | $157.2K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 1,401 | $83.3K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 1,410 | $84.6K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 467 | $27.2K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 333 | $19.9K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 33 | $2.0K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 334 | $19.9K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 34 | $2.0K | 2021-08-19 |
| 2021-08-17 | S, sale reported on Form 4 | 466 | $27.1K | 2021-08-19 |
| 2021-08-18 | S, sale reported on Form 4 | 2,878 | $176.9K | 2021-08-19 |
| 2021-08-18 | S, sale reported on Form 4 | 1,612 | $98.0K | 2021-08-19 |
| 2021-08-23 | S, sale reported on Form 4 | 2,500 | $176.4K | 2021-08-25 |
| 2021-08-27 | S, sale reported on Form 4 | 1,600 | $118.4K | 2021-08-31 |
| 2021-08-27 | S, sale reported on Form 4 | 67 | $5.0K | 2021-08-31 |
| 2021-08-27 | S, sale reported on Form 4 | 1,500 | $110.4K | 2021-08-31 |
| 2021-08-27 | S, sale reported on Form 4 | 8,100 | $600.3K | 2021-08-31 |
| 2021-08-27 | S, sale reported on Form 4 | 400 | $29.9K | 2021-08-31 |
| 2021-08-27 | S, sale reported on Form 4 | 66 | $4.9K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 7,000 | $520.2K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 2,000 | $150.4K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 1,000 | $76.0K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 1,243 | $92.3K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 291 | $21.9K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 133 | $10.1K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 290 | $21.8K | 2021-08-31 |
| 2021-08-30 | S, sale reported on Form 4 | 134 | $10.2K | 2021-08-31 |
| 2021-08-31 | S, sale reported on Form 4 | 134 | $9.9K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 500 | $37.5K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 833 | $63.5K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 200 | $15.4K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 133 | $9.8K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 201 | $15.4K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 894 | $66.1K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 3,139 | $235.6K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 5,067 | $386.1K | 2021-09-02 |
| 2021-08-31 | S, sale reported on Form 4 | 900 | $69.2K | 2021-09-02 |
| 2021-09-13 | S, sale reported on Form 4 | 267 | $19.9K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 534 | $39.5K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 533 | $38.9K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 200 | $14.3K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 1,000 | $70.6K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 1,400 | $100.6K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 3,112 | $227.5K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 2,788 | $206.5K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 1,700 | $127.0K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 134 | $9.4K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 533 | $39.4K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 266 | $19.9K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 133 | $9.4K | 2021-09-15 |
| 2021-09-13 | S, sale reported on Form 4 | 534 | $38.9K | 2021-09-15 |
| 2021-09-14 | S, sale reported on Form 4 | 227 | $17.2K | 2021-09-15 |
| 2021-09-14 | S, sale reported on Form 4 | 473 | $35.3K | 2021-09-15 |
Newest 100 of 823
Source
Counted from the Form 4 filings this reporting owner (SEC CIK 1239501) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.
Source: U.S. Securities and Exchange Commission (EDGAR) and other official
government data · Updated 2026-10-12 ·
For informational purposes only, not investment advice.
Privacy · Terms