Derek J Maetzold Insider Trading Activity
Corporate InsiderPres. & Chief Exec. Officer · CIK 1239501
Derek J Maetzold has been net-selling over the last 12 months with 0 purchases and 68 sales across 1 company.
CSTL is the most-traded position with 68 trades. The largest single transaction was a sale of CSTL for $839K on Aug 13, 2025.
Performance Scorecard
Forward stock performance after each transaction by Derek J Maetzold. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | — | +4.8% | 78% | 60 |
| 90 days | — | -2.4% | 55% | 29 |
| 120 days | — | +4.1% | 66% | 29 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersCSTL · CASTLE BIOSCIENCES INC
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Showing the 50 most recent of 68 disclosed trades.
| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | ROLE |
|---|---|---|---|---|---|---|
| May 21, 2026 | CSTL | Sell | 212 | $20.20 | $4K | Pres. & Chief Exec. Officer |
| May 21, 2026 | CSTL | Sell | 1,035 | $20.20 | $21K | Pres. & Chief Exec. Officer |
| May 21, 2026 | CSTL | Sell | 880 | $20.20 | $18K | Pres. & Chief Exec. Officer |
| May 21, 2026 | CSTL | Sell | 420 | $20.20 | $8K | Pres. & Chief Exec. Officer |
| May 20, 2026 | CSTL | Sell | 130 | $20.00 | $3K | Pres. & Chief Exec. Officer |
| May 20, 2026 | CSTL | Sell | 273 | $20.00 | $5K | Pres. & Chief Exec. Officer |
| May 20, 2026 | CSTL | Sell | 66 | $20.00 | $1K | Pres. & Chief Exec. Officer |
| May 20, 2026 | CSTL | Sell | 322 | $20.00 | $6K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 1,159 | $22.08 | $26K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 5,308 | $22.08 | $117K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 985 | $22.08 | $22K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 237 | $22.08 | $5K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 906 | $22.59 | $20K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 198 | $22.59 | $4K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 168 | $22.59 | $4K | Pres. & Chief Exec. Officer |
| May 7, 2026 | CSTL | Sell | 41 | $22.59 | $925.985 | Pres. & Chief Exec. Officer |
| Apr 21, 2026 | CSTL | Sell | 550 | $25.10 | $14K | Pres. & Chief Exec. Officer |
| Apr 21, 2026 | CSTL | Sell | 1,357 | $25.10 | $34K | Pres. & Chief Exec. Officer |
| Apr 21, 2026 | CSTL | Sell | 1,153 | $25.10 | $29K | Pres. & Chief Exec. Officer |
| Apr 21, 2026 | CSTL | Sell | 278 | $25.10 | $7K | Pres. & Chief Exec. Officer |
| Apr 6, 2026 | CSTL | Sell | 1,357 | $25.03 | $34K | Pres. & Chief Exec. Officer |
| Apr 6, 2026 | CSTL | Sell | 6,214 | $25.03 | $156K | Pres. & Chief Exec. Officer |
| Apr 6, 2026 | CSTL | Sell | 1,153 | $25.03 | $29K | Pres. & Chief Exec. Officer |
| Apr 6, 2026 | CSTL | Sell | 278 | $25.03 | $7K | Pres. & Chief Exec. Officer |
| Mar 26, 2026 | CSTL | Sell | 550 | $25.55 | $14K | Pres. & Chief Exec. Officer |
| Mar 26, 2026 | CSTL | Sell | 1,357 | $25.55 | $35K | Pres. & Chief Exec. Officer |
| Mar 26, 2026 | CSTL | Sell | 1,153 | $25.55 | $29K | Pres. & Chief Exec. Officer |
| Mar 26, 2026 | CSTL | Sell | 278 | $25.55 | $7K | Pres. & Chief Exec. Officer |
| Mar 18, 2026 | CSTL | Sell | 650 | $25.39 | $17K | Pres. & Chief Exec. Officer |
| Mar 17, 2026 | CSTL | Sell | 18,650 | $25.93 | $484K | Pres. & Chief Exec. Officer |
| Mar 16, 2026 | CSTL | Sell | 17,449 | $25.96 | $453K | Pres. & Chief Exec. Officer |
| Mar 16, 2026 | CSTL | Sell | 126 | $26.68 | $3K | Pres. & Chief Exec. Officer |
| Mar 13, 2026 | CSTL | Sell | 13,204 | $25.45 | $336K | Pres. & Chief Exec. Officer |
| Mar 12, 2026 | CSTL | Sell | 23,179 | $25.28 | $586K | Pres. & Chief Exec. Officer |
| Mar 11, 2026 | CSTL | Sell | 1,357 | $26.11 | $35K | Pres. & Chief Exec. Officer |
| Mar 11, 2026 | CSTL | Sell | 17,310 | $26.11 | $452K | Pres. & Chief Exec. Officer |
| Mar 11, 2026 | CSTL | Sell | 1,160 | $26.11 | $30K | Pres. & Chief Exec. Officer |
| Mar 11, 2026 | CSTL | Sell | 282 | $26.11 | $7K | Pres. & Chief Exec. Officer |
| Mar 11, 2026 | CSTL | Sell | 279 | $26.11 | $7K | Pres. & Chief Exec. Officer |
| Feb 4, 2026 | CSTL | Sell | 646 | $37.82 | $24K | Pres. & Chief Exec. Officer |
| Feb 4, 2026 | CSTL | Sell | 171 | $38.61 | $7K | Pres. & Chief Exec. Officer |
| Feb 3, 2026 | CSTL | Sell | 3,200 | $39.91 | $128K | Pres. & Chief Exec. Officer |
| Jan 20, 2026 | CSTL | Sell | 4,017 | $40.01 | $161K | Pres. & Chief Exec. Officer |
| Jan 6, 2026 | CSTL | Sell | 1,339 | $40.10 | $54K | Pres. & Chief Exec. Officer |
| Jan 5, 2026 | CSTL | Sell | 2,678 | $38.09 | $102K | Pres. & Chief Exec. Officer |
| Dec 22, 2025 | CSTL | Sell | 830 | $40.35 | $33K | Pres. & Chief Exec. Officer |
| Dec 17, 2025 | CSTL | Sell | 509 | $40.04 | $20K | Pres. & Chief Exec. Officer |
| Dec 16, 2025 | CSTL | Sell | 12,821 | $38.55 | $494K | Pres. & Chief Exec. Officer |
| Dec 15, 2025 | CSTL | Sell | 18,513 | $38.75 | $717K | Pres. & Chief Exec. Officer |
| Dec 15, 2025 | CSTL | Sell | 1,012 | $39.30 | $40K | Pres. & Chief Exec. Officer |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| CSTL | CASTLE BIOSCIENCES INC | 68 | $7.2M |
Other insiders at CASTLE BIOSCIENCES INC
3 other tracked filers at CSTL.