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 77 sales across 1 company.
CSTL is the most-traded position with 77 trades. The largest single transaction was a sale of CSTL for $717K on Dec 15, 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 | — | +2.7% | 65% | 72 |
| 90 days | — | -7.0% | 57% | 68 |
| 120 days | — | -14.9% | 50% | 68 |
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 87 disclosed trades.
| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | Δ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
Oct 19, 2026 | CSTL | Sell | 3,198 | $31.91 | $102K | −39.8% | Pres. & Chief Exec. Officer | |
Oct 19, 2026 | CSTL | Sell | 8,580 | $31.91 | $274K | −40.7% | Pres. & Chief Exec. Officer | |
Oct 19, 2026 | CSTL | Sell | 2,718 | $31.91 | $87K | −39.8% | Pres. & Chief Exec. Officer | |
Oct 5, 2026 | CSTL | Sell | 8,580 | $35.57 | $305K | −28.9% | Pres. & Chief Exec. Officer | |
Oct 5, 2026 | CSTL | Sell | 2,718 | $35.57 | $97K | −28.5% | Pres. & Chief Exec. Officer | |
Oct 5, 2026 | CSTL | Sell | 3,198 | $35.57 | $114K | −28.5% | Pres. & Chief Exec. Officer | |
Sep 21, 2026 | CSTL | Sell | 3,198 | $35.33 | $113K | −22.2% | Pres. & Chief Exec. Officer | |
Sep 21, 2026 | CSTL | Sell | 2,718 | $35.33 | $96K | −22.2% | Pres. & Chief Exec. Officer | |
Sep 21, 2026 | CSTL | Sell | 8,580 | $35.33 | $303K | −28.5% | Pres. & Chief Exec. Officer | |
Sep 11, 2026 | CSTL | Sell | 83 | $32.78 | $3K | −0.6% | Pres. & Chief Exec. Officer | |
Sep 11, 2026 | CSTL | Sell | 8,361 | $32.00 | $268K | −27.8% | Pres. & Chief Exec. Officer | |
Sep 11, 2026 | CSTL | Sell | 223 | $32.78 | $7K | −1.0% | Pres. & Chief Exec. Officer | |
Sep 11, 2026 | CSTL | Sell | 2,656 | $32.00 | $85K | −17.7% | Pres. & Chief Exec. Officer | |
Sep 11, 2026 | CSTL | Sell | 3,124 | $32.00 | $100K | −17.7% | Pres. & Chief Exec. Officer | |
Sep 11, 2026 | CSTL | Sell | 71 | $32.78 | $2K | −0.6% | Pres. & Chief Exec. Officer | |
Aug 14, 2026 | CSTL | Sell | 2,714 | $30.02 | $81K | −11.8% | Pres. & Chief Exec. Officer | |
Aug 14, 2026 | CSTL | Sell | 2,306 | $30.02 | $69K | −11.8% | Pres. & Chief Exec. Officer | |
Aug 14, 2026 | CSTL | Sell | 278 | $30.02 | $8K | −2.4% | Pres. & Chief Exec. Officer | |
Aug 14, 2026 | CSTL | Sell | 1,100 | $30.02 | $33K | −4.9% | Pres. & Chief Exec. Officer | |
May 21, 2026 | CSTL | Sell | 1,035 | $20.20 | $21K | −2.3% | Pres. & Chief Exec. Officer | |
May 21, 2026 | CSTL | Sell | 212 | $20.20 | $4K | −9.8% | Pres. & Chief Exec. Officer | |
May 21, 2026 | CSTL | Sell | 420 | $20.20 | $8K | −1.9% | Pres. & Chief Exec. Officer | |
May 21, 2026 | CSTL | Sell | 880 | $20.20 | $18K | −2.3% | Pres. & Chief Exec. Officer | |
May 20, 2026 | CSTL | Sell | 66 | $20.00 | $1K | −3.0% | Pres. & Chief Exec. Officer | |
May 20, 2026 | CSTL | Sell | 273 | $20.00 | $5K | −0.7% | Pres. & Chief Exec. Officer | |
May 20, 2026 | CSTL | Sell | 322 | $20.00 | $6K | −0.7% | Pres. & Chief Exec. Officer | |
May 20, 2026 | CSTL | Sell | 130 | $20.00 | $3K | −0.6% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 168 | $22.59 | $4K | −0.4% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 41 | $22.59 | $925.985 | −1.8% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 985 | $22.08 | $22K | −2.4% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 237 | $22.08 | $5K | −9.5% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 906 | $22.59 | $20K | −4.0% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 198 | $22.59 | $4K | −0.4% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 5,308 | $22.08 | $117K | −19.2% | Pres. & Chief Exec. Officer | |
May 7, 2026 | CSTL | Sell | 1,159 | $22.08 | $26K | −2.4% | Pres. & Chief Exec. Officer | |
Apr 21, 2026 | CSTL | Sell | 1,357 | $25.10 | $34K | −2.8% | Pres. & Chief Exec. Officer | |
Apr 21, 2026 | CSTL | Sell | 550 | $25.10 | $14K | −2.5% | Pres. & Chief Exec. Officer | |
Apr 21, 2026 | CSTL | Sell | 278 | $25.10 | $7K | −10.0% | Pres. & Chief Exec. Officer | |
Apr 21, 2026 | CSTL | Sell | 1,153 | $25.10 | $29K | −2.8% | Pres. & Chief Exec. Officer | |
Apr 6, 2026 | CSTL | Sell | 1,153 | $25.03 | $29K | −2.7% | Pres. & Chief Exec. Officer | |
Apr 6, 2026 | CSTL | Sell | 6,214 | $25.03 | $156K | −22.4% | Pres. & Chief Exec. Officer | |
Apr 6, 2026 | CSTL | Sell | 1,357 | $25.03 | $34K | −2.7% | Pres. & Chief Exec. Officer | |
Apr 6, 2026 | CSTL | Sell | 278 | $25.03 | $7K | −9.1% | Pres. & Chief Exec. Officer | |
Mar 26, 2026 | CSTL | Sell | 278 | $25.55 | $7K | −8.3% | Pres. & Chief Exec. Officer | |
Mar 26, 2026 | CSTL | Sell | 1,153 | $25.55 | $29K | −2.6% | Pres. & Chief Exec. Officer | |
Mar 26, 2026 | CSTL | Sell | 1,357 | $25.55 | $35K | −2.6% | Pres. & Chief Exec. Officer | |
Mar 26, 2026 | CSTL | Sell | 550 | $25.55 | $14K | −2.5% | Pres. & Chief Exec. Officer | |
Mar 18, 2026 | CSTL | Sell | 650 | $25.39 | $17K | −2.9% | Pres. & Chief Exec. Officer | |
Mar 17, 2026 | CSTL | Sell | 18,650 | $25.93 | $484K | −45.7% | Pres. & Chief Exec. Officer | |
Mar 16, 2026 | CSTL | Sell | 126 | $26.68 | $3K | −0.3% | Pres. & Chief Exec. Officer |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| CSTL | CASTLE BIOSCIENCES INC | 87 | $9.3M |
Other insiders at CASTLE BIOSCIENCES INC
3 other tracked filers at CSTL.