Derek J Maetzold sold $1.2M of CSTL
Pres. & Chief Exec. Officer at CASTLE BIOSCIENCES INC. 39,016 shares at an average of $31.07, traded Aug 4, 2026, filed Aug 6, 2026.
Score components
- +25RoleCEO
- +25Trade size$1.2M at market
- +20Share of holdings soldSold 93% of holdings
- +15Cluster4 insiders selling within 14 days
- -15Exercise and sellShares came from an option exercise in the same filing
- -2010b5-1 planPre-scheduled under a 10b5-1 plan
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001628280-26-054334, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Aug 4, 2026 | MOption exercise Common Stock10b5-1 | +20,356 | $2.39 | $49k | 41,835 | Aug 6, 2026 |
| Aug 4, 2026 | SOpen-market sale Common Stock10b5-1 | -8,421 | $30.79 | $259k | 33,414 | Aug 6, 2026 |
| Aug 4, 2026 | SOpen-market sale Common Stockindirect: By The Maetzold Descendants 2020 Trust10b5-1 | -3,374 | $30.79 | $104k | 28,407 | Aug 6, 2026 |
| Aug 4, 2026 | SOpen-market sale Common Stockindirect: By Derek Maetzold 2020 Irrevocable Trust10b5-1 | -2,866 | $30.79 | $88k | 24,143 | Aug 6, 2026 |
| Aug 4, 2026 | SOpen-market sale Common Stock10b5-1 | -11,935 | $31.34 | $374k | 21,479 | Aug 6, 2026 |
| Aug 4, 2026 | SOpen-market sale Common Stockindirect: By The Maetzold Descendants 2020 Trust10b5-1 | -4,782 | $31.34 | $150k | 23,625 | Aug 6, 2026 |
| Aug 4, 2026 | SOpen-market sale Common Stockindirect: By Derek Maetzold 2020 Irrevocable Trust10b5-1 | -4,063 | $31.34 | $127k | 20,080 | Aug 6, 2026 |
| Aug 5, 2026 | MOption exercise Common Stock10b5-1 | +2,546 | $2.39 | $6,085 | 24,025 | Aug 6, 2026 |
| Aug 5, 2026 | SOpen-market sale Common Stock10b5-1 | -2,546 | $30.68 | $78k | 21,479 | Aug 6, 2026 |
| Aug 5, 2026 | SOpen-market sale Common Stockindirect: By The Maetzold Descendants 2020 Trust10b5-1 | -556 | $30.68 | $17k | 23,069 | Aug 6, 2026 |
| Aug 5, 2026 | SOpen-market sale Common Stockindirect: By Derek Maetzold 2020 Irrevocable Trust10b5-1 | -473 | $30.68 | $15k | 19,607 | Aug 6, 2026 |
| Aug 4, 2026 | MOption exercise Stock option (right to buy)derivative10b5-1 | -20,356 | $0.00 | $0 | 41,403 | Aug 6, 2026 |
| Aug 5, 2026 | MOption exercise Stock option (right to buy)derivative10b5-1 | -2,546 | $0.00 | $0 | 38,857 | Aug 6, 2026 |
Related signals
Other insiders at CASTLE BIOSCIENCES INC and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 33Weak | CASTLE BIOSCIENCES INC | Derek J Maetzold Pres. & Chief Exec. Officer | $516k 14,496 shares | -49% | |
| 16Weak | CASTLE BIOSCIENCES INC | Kristen M Oelschlager Chief Operating Officer | $149k 4,153 shares | -24% | |
| 28Weak | CASTLE BIOSCIENCES INC | Tobin W Juvenal Chief Commercial Officer | $232k 6,577 shares | -11% | |
| 33Weak | CASTLE BIOSCIENCES INC | Derek J Maetzold Pres. & Chief Exec. Officer | $512k 14,496 shares | -48% | |
| 27Weak | CASTLE BIOSCIENCES INC | Tobin W Juvenal Chief Commercial Officer | $223k 6,600 shares | -10% | |
| 32Weak | CASTLE BIOSCIENCES INC | Derek J Maetzold Pres. & Chief Exec. Officer | $465k 14,518 shares | -48% | |
| 16Weak | CASTLE BIOSCIENCES INC | Kristen M Oelschlager Chief Operating Officer | $139k 4,152 shares | -24% | |
| 17Weak | CASTLE BIOSCIENCES INC | Tobin W Juvenal Chief Commercial Officer | $57k 1,730 shares | -3% | |
| 45Moderate | CASTLE BIOSCIENCES INC | Derek J Maetzold Pres. & Chief Exec. Officer | $616k 18,560 shares | -55% | |
| 29Weak | CASTLE BIOSCIENCES INC | Tobin W Juvenal Chief Commercial Officer | $317k 9,050 shares | -12% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.