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Castle Biosciences Inc (NASDAQ:CSTL)
US · Delayed Price · Currency is USD
Healthcare · Medical - Diagnostics & Research
33.56+0.48 (+1.47%)
Insider Score
––Not scored
CSTL Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
CSTL Stock Insider Trading Activity
CSTL stock’s insider trading shows 23 sales on the open market for an estimated $2.40M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Juvenal Tobin W Other | Sell | 3,288 | $33.64 | $110.61K | 6.3% | 48,719 | Oct 12, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Option exercise | 8,165 | $2.39 | $19.51K | 38.0% | 29,644 | Oct 5, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 2,718 | $35.57 | $96.67K | 28.5% | 6,832 | Oct 5, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 3,198 | $35.57 | $113.74K | 28.5% | 8,038 | Oct 5, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 8,580 | $35.57 | $305.16K | 28.9% | 21,064 | Oct 5, 2026 | — | Form 4 |
| Oelschlager Kristen M COO | Option exercise | 4,153 | $3.38 | $14.04K | 31.1% | 17,509 | Oct 1, 2026 | — | Form 4 |
| Oelschlager Kristen M COO | Sell | 2,807 | $35.75 | $100.35K | 16.0% | 14,702 | Oct 1, 2026 | — | Form 4 |
| Oelschlager Kristen M COO | Sell | 1,346 | $36.38 | $48.97K | 9.2% | 13,356 | Oct 1, 2026 | — | Form 4 |
| Juvenal Tobin W Other | Sell | 1,034 | $34.20 | $35.36K | 1.9% | 52,007 | Sep 30, 2026 | — | Form 4 |
| Juvenal Tobin W Other | Sell | 5,543 | $35.50 | $196.77K | 9.5% | 53,041 | Sep 29, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 8,580 | $35.33 | $303.17K | 28.5% | 21,479 | Sep 21, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Option exercise | 8,580 | $2.39 | $20.51K | 39.9% | 30,059 | Sep 21, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 2,718 | $35.33 | $96.04K | 22.2% | 9,550 | Sep 21, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 3,198 | $35.33 | $113.00K | 22.2% | 11,236 | Sep 21, 2026 | — | Form 4 |
| Juvenal Tobin W Other | Sell | 3,294 | $35.14 | $115.76K | 5.3% | 58,584 | Sep 15, 2026 | — | Form 4 |
| Juvenal Tobin W Other | Sell | 3,306 | $32.32 | $106.86K | 5.1% | 61,878 | Sep 14, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 8,361 | $32.00 | $267.55K | 27.8% | 21,702 | Sep 11, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Option exercise | 8,584 | $2.39 | $20.52K | 40.0% | 30,063 | Sep 11, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 83 | $32.78 | $2.72K | 0.6% | 14,434 | Sep 11, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 223 | $32.78 | $7.31K | 1.0% | 21,479 | Sep 11, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 2,656 | $32.00 | $84.99K | 17.7% | 12,339 | Sep 11, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 3,124 | $32.00 | $99.97K | 17.7% | 14,517 | Sep 11, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 71 | $32.78 | $2.33K | 0.6% | 12,268 | Sep 11, 2026 | — | Form 4 |
| Oelschlager Kristen M COO | Sell | 3,952 | $33.36 | $131.84K | 22.6% | 13,556 | Sep 1, 2026 | — | Form 4 |
| Oelschlager Kristen M COO | Option exercise | 4,152 | $3.38 | $14.03K | 31.1% | 17,508 | Sep 1, 2026 | — | Form 4 |
| Oelschlager Kristen M COO | Sell | 200 | $34.02 | $6.80K | 1.5% | 13,356 | Sep 1, 2026 | — | Form 4 |
| Juvenal Tobin W Other | Sell | 1,730 | $32.81 | $56.76K | 2.6% | 65,184 | Aug 31, 2026 | — | Form 4 |
| MAETZOLD DEREK J Director | Sell | 21 | $33.88 | $711.48 | 0.2% | 11,256 | Aug 28, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.