DM
Derek J Maetzold
Pres. & Chief Exec. OfficerDirector
Derek J MaetzoldPres. & Chief Exec. OfficerDirector
Derek J Maetzold insider trades: Castle Biosciences (CSTL) stock sales
Pres. & Chief Exec. Officer, Castle Biosciences Last trade Nov 2, 2026 197 Form 4 filings
$8.9M
Sold, last 12 months
75 sales
$0
Bought, last 12 months
0 buys
550
Open-market trades
since 2005
2
Companies
last trade 2026
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Derek reports to the SEC
Open-market buys and sales
550 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Nov 2, 2026 | CSTL | ↓ Sell | 8,580 | $36.10 | $310K | Direct | Nov 4, 2026 (2d) |
| Nov 2, 2026 | CSTL | ↓ Sell | 3,198 | $36.10 | $115K | By The Maetzold Descendants 2020 Trust | Nov 4, 2026 (2d) |
| Nov 2, 2026 | CSTL | ↓ Sell | 2,718 | $36.10 | $98K | By Derek Maetzold 2020 Irrevocable Trust | Nov 4, 2026 (2d) |
| Oct 19, 2026 | CSTL | ↓ Sell | 8,580 | $31.91 | $274K | Direct | Oct 21, 2026 (2d) |
| Oct 19, 2026 | CSTL | ↓ Sell | 3,198 | $31.91 | $102K | By The Maetzold Descendants 2020 Trust | Oct 21, 2026 (2d) |
| Oct 19, 2026 | CSTL | ↓ Sell | 2,718 | $31.91 | $87K | By Derek Maetzold 2020 Irrevocable Trust | Oct 21, 2026 (2d) |
| Oct 5, 2026 | CSTL | ↓ Sell | 8,580 | $35.57 | $305K | Direct | Oct 7, 2026 (2d) |
| Oct 5, 2026 | CSTL | ↓ Sell | 3,198 | $35.57 | $114K | By The Maetzold Descendants 2020 Trust | Oct 7, 2026 (2d) |
| Oct 5, 2026 | CSTL | ↓ Sell | 2,718 | $35.57 | $97K | By Derek Maetzold 2020 Irrevocable Trust | Oct 7, 2026 (2d) |
| Sep 21, 2026 | CSTL | ↓ Sell | 8,580 | $35.33 | $303K | Direct | Sep 23, 2026 (2d) |
| Sep 21, 2026 | CSTL | ↓ Sell | 3,198 | $35.33 | $113K | By The Maetzold Descendants 2020 Trust | Sep 23, 2026 (2d) |
| Sep 21, 2026 | CSTL | ↓ Sell | 2,718 | $35.33 | $96K | By Derek Maetzold 2020 Irrevocable Trust | Sep 23, 2026 (2d) |
| Sep 11, 2026 | CSTL | ↓ Sell | 8,584 | $32.02 | $275K | Direct | Sep 15, 2026 (4d) |
| Sep 11, 2026 | CSTL | ↓ Sell | 3,207 | $32.02 | $103K | By The Maetzold Descendants 2020 Trust | Sep 15, 2026 (4d) |
| Sep 11, 2026 | CSTL | ↓ Sell | 2,727 | $32.02 | $87K | By Derek Maetzold 2020 Irrevocable Trust | Sep 15, 2026 (4d) |
| Aug 28, 2026 | CSTL | ↓ Sell | 12,428 | $33.20 | $413K | Direct | Sep 1, 2026 (4d) |
| Aug 28, 2026 | CSTL | ↓ Sell | 2,714 | $33.20 | $90K | By The Maetzold Descendants 2020 Trust | Sep 1, 2026 (4d) |
| Aug 28, 2026 | CSTL | ↓ Sell | 2,306 | $33.20 | $77K | By Derek Maetzold 2020 Irrevocable Trust | Sep 1, 2026 (4d) |
| Aug 28, 2026 | CSTL | ↓ Sell | 834 | $33.20 | $28K | By The Maetzold 2018 Remainder Trust FBO | Sep 1, 2026 (4d) |
| Aug 28, 2026 | CSTL | ↓ Sell | 278 | $33.20 | $9K | By The Maetzold 2018 Remainder Trust FB | Sep 1, 2026 (4d) |
| Aug 3, 2026 | CSTL | ↓ Sell | 17,144 | $30.28 | $519K | Direct | Aug 4, 2026 (1d) |
| Aug 3, 2026 | CSTL | ↓ Sell | 6,215 | $30.29 | $188K | By The Maetzold Descendants 2020 Trust | Aug 4, 2026 (1d) |
| Aug 3, 2026 | CSTL | ↓ Sell | 5,287 | $30.29 | $160K | By Derek Maetzold 2020 Irrevocable Trust | Aug 4, 2026 (1d) |
| Jul 14, 2026 | CSTL | ↓ Sell | 1,357 | $22.92 | $31K | By The Maetzold Descendants 2020 Trust | Jul 16, 2026 (2d) |
| Jul 14, 2026 | CSTL | ↓ Sell | 1,153 | $22.92 | $26K | By Derek Maetzold 2020 Irrevocable Trust | Jul 16, 2026 (2d) |
| Jul 14, 2026 | CSTL | ↓ Sell | 834 | $22.92 | $19K | By The Maetzold 2018 Remainder Trust FBO | Jul 16, 2026 (2d) |
| Jul 14, 2026 | CSTL | ↓ Sell | 550 | $22.92 | $13K | Direct | Jul 16, 2026 (2d) |
| Jul 14, 2026 | CSTL | ↓ Sell | 278 | $22.92 | $6K | By The Maetzold 2018 Remainder Trust FB | Jul 16, 2026 (2d) |
| Jul 1, 2026 | CSTL | ↓ Sell | 6,214 | $24.29 | $151K | Direct | Jul 6, 2026 (5d) |
| Jul 1, 2026 | CSTL | ↓ Sell | 1,357 | $24.29 | $33K | By The Maetzold Descendants 2020 Trust | Jul 6, 2026 (5d) |
| Jul 1, 2026 | CSTL | ↓ Sell | 1,153 | $24.29 | $28K | By Derek Maetzold 2020 Irrevocable Trust | Jul 6, 2026 (5d) |
| Jul 1, 2026 | CSTL | ↓ Sell | 834 | $24.29 | $20K | By The Maetzold 2018 Remainder Trust FBO | Jul 6, 2026 (5d) |
| Jul 1, 2026 | CSTL | ↓ Sell | 278 | $24.29 | $7K | By The Maetzold 2018 Remainder Trust FB | Jul 6, 2026 (5d) |
| Jun 15, 2026 | CSTL | ↓ Sell | 1,357 | $20.66 | $28K | By The Maetzold Descendants 2020 Trust | Jun 17, 2026 (2d) |
| Jun 15, 2026 | CSTL | ↓ Sell | 1,153 | $20.66 | $24K | By Derek Maetzold 2020 Irrevocable Trust | Jun 17, 2026 (2d) |
| Jun 15, 2026 | CSTL | ↓ Sell | 834 | $20.66 | $17K | By The Maetzold 2018 Remainder Trust FBO | Jun 17, 2026 (2d) |
| Jun 15, 2026 | CSTL | ↓ Sell | 550 | $20.66 | $11K | Direct | Jun 17, 2026 (2d) |
| Jun 15, 2026 | CSTL | ↓ Sell | 278 | $20.66 | $6K | By The Maetzold 2018 Remainder Trust FB | Jun 17, 2026 (2d) |
| Jun 1, 2026 | CSTL | ↓ Sell | 6,214 | $20.86 | $130K | Direct | Jun 3, 2026 (2d) |
| Jun 1, 2026 | CSTL | ↓ Sell | 1,357 | $20.86 | $28K | By The Maetzold Descendants 2020 Trust | Jun 3, 2026 (2d) |
| Jun 1, 2026 | CSTL | ↓ Sell | 1,153 | $20.86 | $24K | By Derek Maetzold 2020 Irrevocable Trust | Jun 3, 2026 (2d) |
| Jun 1, 2026 | CSTL | ↓ Sell | 834 | $20.86 | $17K | By The Maetzold 2018 Remainder Trust FBO | Jun 3, 2026 (2d) |
| Jun 1, 2026 | CSTL | ↓ Sell | 278 | $20.86 | $6K | By The Maetzold 2018 Remainder Trust FB | Jun 3, 2026 (2d) |
| May 21, 2026 | CSTL | ↓ Sell | 1,357 | $20.15 | $27K | By The Maetzold Descendants 2020 Trust | May 22, 2026 (1d) |
| May 21, 2026 | CSTL | ↓ Sell | 1,153 | $20.15 | $23K | By Derek Maetzold 2020 Irrevocable Trust | May 22, 2026 (1d) |
| May 21, 2026 | CSTL | ↓ Sell | 834 | $20.15 | $17K | By The Maetzold 2018 Remainder Trust FBO | May 22, 2026 (1d) |
| May 21, 2026 | CSTL | ↓ Sell | 550 | $20.15 | $11K | Direct | May 22, 2026 (1d) |
| May 21, 2026 | CSTL | ↓ Sell | 278 | $20.15 | $6K | By The Maetzold 2018 Remainder Trust FB | May 22, 2026 (1d) |
| May 7, 2026 | CSTL | ↓ Sell | 6,214 | $22.15 | $138K | Direct | May 11, 2026 (4d) |
| May 7, 2026 | CSTL | ↓ Sell | 1,357 | $22.15 | $30K | By The Maetzold Descendants 2020 Trust | May 11, 2026 (4d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other CSTL insiders
Open-market trades in the last 12 months
About Derek J Maetzold's insider trades
Derek J Maetzold is Pres. & Chief Exec. Officer at Castle Biosciences (CSTL). Since May 26, 2005, Derek has reported no open-market purchases and 550 sales worth $94.3M on SEC Form 4. In the last 12 months: 75 sales ($8.9M).
Their filings also include option exercises (25 filings), grants and awards (13 filings), shares withheld for taxes (9 filings), gifts (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every CSTL insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.