CSTL Castle Biosciences, Inc.
Castle Biosciences, Inc. (CSTL) Insider Activity
What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.
How much of that selling was preplanned? 100% planned / 0% discretionary
Largest single sale: $303.2K.
Where they traded
No open-market insider purchase on record.
Recent open-market activity
| Date | Insider | Role | Action | Shares | Price | Value | Held after |
|---|---|---|---|---|---|---|---|
| Juvenal Tobin W | Chief Commercial Officer | Sell 10b5-1 | 1,034 | $34.20 | $35.4K | 52,007 −1.9% of holding | |
| Juvenal Tobin W | Chief Commercial Officer | Sell 10b5-1 | 5,543 | $35.50 | $196.8K | 53,041 −9.5% of holding | |
| MAETZOLD DEREK J 3 fills | Pres. & Chief Exec. Officer | Sell 10b5-1 | 14,496 | $35.33 | $512.2K | 21,479 −40.3% of holding | |
| Juvenal Tobin W | Chief Commercial Officer | Sell 10b5-1 | 3,294 | $35.14 | $115.8K | 58,584 −5.3% of holding | |
| Juvenal Tobin W | Chief Commercial Officer | Sell 10b5-1 | 3,306 | $32.32 | $106.9K | 61,878 −5.1% of holding | |
| MAETZOLD DEREK J 6 fills | Pres. & Chief Exec. Officer | Sell 10b5-1 | 14,518 | $32.02 | $464.9K | 21,702 −40.1% of holding |
Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.