Castle Biosciences Inc. (CSTL)
Castle Biosciences Inc. (CSTL) Insider Trading
Directors, officers and holders of more than 10% of CSTL report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 724 transactions on file: 0 with code P, 39 with code S and 11 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 28, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 1,237 | $35.58 | $44,009 |
| Oct 28, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 5,341 | $36.62 | $195,582 |
| Oct 26, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 3,288 | $33.08 | $108,767 |
| Oct 19, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 3,198 | $31.91 | $102,048 |
| Oct 19, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 8,580 | $31.91 | $273,788 |
| Oct 19, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 2,718 | $31.91 | $86,731 |
| Oct 12, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 3,288 | $33.64 | $110,608 |
| Oct 5, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | M Exercise | 8,165 | $2.39 | $19,514 |
| Oct 5, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 2,718 | $35.57 | $96,668 |
| Oct 5, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 8,580 | $35.57 | $305,156 |
| Oct 5, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | M Exercise | 8,165 | Not measured | Not measured |
| Oct 5, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 3,198 | $35.57 | $113,740 |
| Oct 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | M Exercise | 4,153 | $3.38 | $14,037 |
| Oct 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | S Sale | 2,807 | $35.75 | $100,350 |
| Oct 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | M Exercise | 4,153 | Not measured | Not measured |
| Oct 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | S Sale | 1,346 | $36.38 | $48,967 |
| Sep 30, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 1,034 | $34.20 | $35,363 |
| Sep 29, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 5,543 | $35.50 | $196,765 |
| Sep 21, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 8,580 | $35.33 | $303,166 |
| Sep 21, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 2,718 | $35.33 | $96,038 |
| Sep 21, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 3,198 | $35.33 | $112,998 |
| Sep 21, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | M Exercise | 8,580 | Not measured | Not measured |
| Sep 21, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | M Exercise | 8,580 | $2.39 | $20,506 |
| Sep 15, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 3,294 | $35.14 | $115,758 |
| Sep 14, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 3,306 | $32.32 | $106,863 |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 8,361 | $32.00 | $267,552 |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 3,124 | $32.00 | $99,968 |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 223 | $32.78 | $7,310 |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 83 | $32.78 | $2,721 |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 71 | $32.78 | $2,327 |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | M Exercise | 8,584 | Not measured | Not measured |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | M Exercise | 8,584 | $2.39 | $20,516 |
| Sep 11, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 2,656 | $32.00 | $84,992 |
| Sep 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | S Sale | 3,952 | $33.36 | $131,839 |
| Sep 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | M Exercise | 4,152 | $3.38 | $14,034 |
| Sep 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | S Sale | 200 | $34.02 | $6,804 |
| Sep 1, 2026 | Oelschlager Kristen M | Chief Operating Officer | M Exercise | 4,152 | Not measured | Not measured |
| Aug 31, 2026 | Juvenal Tobin W | Chief Commercial Officer | S Sale | 1,730 | $32.81 | $56,761 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 257 | $33.14 | $8,517 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 21 | $33.88 | $711 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 257 | $33.14 | $8,517 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 21 | $33.88 | $711 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 2,505 | $33.14 | $83,016 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 2,129 | $33.14 | $70,555 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 257 | $33.14 | $8,517 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 257 | $33.14 | $8,517 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | M Exercise | 12,428 | $2.39 | $29,703 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 21 | $33.88 | $711 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 956 | $33.88 | $32,389 |
| Aug 28, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | S Sale | 209 | $33.88 | $7,081 |
The full Form 4 history is on the CSTL company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.