As of the latest Form 4 filed Jul 6, 2026.
What Castle Biosciences Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 126 most recent filings for CSTL.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −278.00 | $24.29 | $6.75K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $24.29 | $6.75K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $24.29 | $6.75K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $24.29 | $6.75K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.15K | $24.29 | $28.0K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.36K | $24.29 | $33.0K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −6.21K | $24.29 | $151K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +6.21K | $2.39 | $14.9K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | Oelschlager Kristen M Chief Operating Officer | SSale | −400.00 | $24.78 | $9.91K | Yes (planned) | Form 4 ↗ |
| 2026-07-06 | 2026-07-01 | Oelschlager Kristen M, Chief Operating Officer | SSale | −8.19K | $24.40 | $200K | Yes (planned) | Form 4 ↗ |
| 2026-06-18 | 2026-06-16 | Oelschlager Kristen M Chief Operating Officer | SSale | −8.59K | $20.71 | $178K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −278.00 | $20.66 | $5.74K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $20.66 | $5.74K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $20.66 | $5.74K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $20.66 | $5.74K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.15K | $20.66 | $23.8K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.36K | $20.66 | $28.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −550.00 | $20.66 | $11.4K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +550.00 | $2.39 | $1.31K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −278.00 | $20.86 | $5.80K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $20.86 | $5.80K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $20.86 | $5.80K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $20.86 | $5.80K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.15K | $20.86 | $24.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.36K | $20.86 | $28.3K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −6.21K | $20.86 | $130K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +6.01K | $2.39 | $14.4K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +204.00 | $2.39 | $487.56 | Yes (planned) | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | BRADBURY DANIEL Director | MExercise | +13.7K | — | — | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Harrison Miles Director | MExercise | +13.7K | — | — | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Olson Tiffany Director | MExercise | +13.7K | — | — | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Goldberg Ellen Director | MExercise | +13.7K | — | — | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Caple Kim Director | MExercise | +13.7K | — | — | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Cotton Rodney Director | MExercise | +13.7K | — | — | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Cole G Bradley Director | MExercise | +13.7K | — | — | No | Form 4 ↗ |
| 2026-05-26 | 2026-05-21 | Juvenal Tobin W Chief Commercial Officer | MExercise | +11.2K | $3.38 | $37.9K | No | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −212.00 | $20.20 | $4.28K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −212.00 | $20.20 | $4.28K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −212.00 | $20.20 | $4.28K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −212.00 | $20.20 | $4.28K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −880.00 | $20.20 | $17.8K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.03K | $20.20 | $20.9K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −420.00 | $20.20 | $8.48K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +420.00 | $2.39 | $1.00K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −66.00 | $20.00 | $1.32K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −66.00 | $20.00 | $1.32K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −66.00 | $20.00 | $1.32K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −66.00 | $20.00 | $1.32K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −273.00 | $20.00 | $5.46K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −322.00 | $20.00 | $6.44K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −130.00 | $20.00 | $2.60K | Yes (planned) | Form 4 ↗ |
| 2026-05-22 | 2026-05-20 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +130.00 | $2.39 | $310.70 | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −41.00 | $22.59 | $925.99 | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −41.00 | $22.59 | $925.99 | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −41.00 | $22.59 | $925.99 | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −41.00 | $22.59 | $925.99 | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −168.00 | $22.59 | $3.79K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −198.00 | $22.59 | $4.47K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −906.00 | $22.59 | $20.5K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −237.00 | $22.08 | $5.23K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −237.00 | $22.08 | $5.23K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −237.00 | $22.08 | $5.23K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −237.00 | $22.08 | $5.23K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −985.00 | $22.08 | $21.7K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.16K | $22.08 | $25.6K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −5.31K | $22.08 | $117K | Yes (planned) | Form 4 ↗ |
| 2026-05-11 | 2026-05-07 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +6.21K | $2.39 | $14.9K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −278.00 | $25.10 | $6.98K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.10 | $6.98K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.10 | $6.98K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.10 | $6.98K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.15K | $25.10 | $28.9K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.36K | $25.10 | $34.1K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −550.00 | $25.10 | $13.8K | Yes (planned) | Form 4 ↗ |
| 2026-04-23 | 2026-04-21 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +550.00 | $2.39 | $1.31K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −278.00 | $25.03 | $6.96K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.03 | $6.96K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.03 | $6.96K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.03 | $6.96K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.15K | $25.03 | $28.9K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.36K | $25.03 | $34.0K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −6.21K | $25.03 | $156K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +6.21K | $2.39 | $14.9K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −278.00 | $25.55 | $7.10K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.55 | $7.10K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.55 | $7.10K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −278.00 | $25.55 | $7.10K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.15K | $25.55 | $29.5K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.36K | $25.55 | $34.7K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −550.00 | $25.55 | $14.1K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +550.00 | $2.39 | $1.31K | Yes (planned) | Form 4 ↗ |
| 2026-03-30 | 2026-03-26 | Cotton Rodney Director | MExercise | +5.33K | — | — | No | Form 4 ↗ |
| 2026-03-19 | 2026-03-18 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −650.00 | $25.39 | $16.5K | Yes (planned) | Form 4 ↗ |
| 2026-03-19 | 2026-03-17 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −18.6K | $25.93 | $484K | Yes (planned) | Form 4 ↗ |
| 2026-03-17 | 2026-03-16 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −126.00 | $26.68 | $3.36K | Yes (planned) | Form 4 ↗ |
| 2026-03-17 | 2026-03-16 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −17.4K | $25.96 | $453K | Yes (planned) | Form 4 ↗ |
| 2026-03-17 | 2026-03-13 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −13.2K | $25.45 | $336K | Yes (planned) | Form 4 ↗ |
| 2026-03-16 | 2026-03-12 | Juvenal Tobin W Chief Commercial Officer | SSale | −20.9K | $25.24 | $527K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | SSale | −23.2K | $25.28 | $586K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −279.00 | $26.11 | $7.28K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −279.00 | $26.11 | $7.28K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −279.00 | $26.11 | $7.28K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −282.00 | $26.11 | $7.36K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.16K | $26.11 | $30.3K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −1.36K | $26.11 | $35.4K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | SSale | −17.3K | $26.11 | $452K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +6.23K | $2.39 | $14.9K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Stokes Frank Chief Financial Officer | SSale | −6.00K | $27.98 | $168K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Cole G Bradley Director | SSale | −2.65K | $28.51 | $75.7K | No | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Cole G Bradley, Director | SSale | −4.75K | $28.44 | $135K | No | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Cole G Bradley, Director | MExercise | +4.75K | $3.38 | $16.0K | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | Juvenal Tobin W Chief Commercial Officer | FTax | −10.4K | $28.17 | $293K | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | Juvenal Tobin W, Chief Commercial Officer | MExercise | +25.8K | — | — | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | Oelschlager Kristen M Chief Operating Officer | FTax | −6.79K | $28.17 | $191K | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | Oelschlager Kristen M, Chief Operating Officer | MExercise | +25.8K | — | — | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | FTax | −17.9K | $28.17 | $505K | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | MAETZOLD DEREK J, Pres. & Chief Exec. Officer | MExercise | +59.1K | — | — | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | Stokes Frank Chief Financial Officer | MExercise | +3.80K | $3.38 | $12.8K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | Stokes Frank, Chief Financial Officer | FTax | −10.7K | $28.17 | $302K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-04 | Stokes Frank, Chief Financial Officer | MExercise | +24.1K | — | — | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-03 | Juvenal Tobin W Chief Commercial Officer | FTax | −3.72K | $27.57 | $102K | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-03 | Oelschlager Kristen M Chief Operating Officer | FTax | −2.43K | $27.57 | $66.9K | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-03 | MAETZOLD DEREK J Pres. & Chief Exec. Officer | FTax | −19.0K | $27.57 | $525K | No | Form 4 ↗ |
| 2026-03-05 | 2026-03-03 | Stokes Frank Chief Financial Officer | FTax | −3.61K | $27.57 | $99.6K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-03 | Stokes Frank, Chief Financial Officer | SSale | −1.70K | $27.81 | $47.3K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-03 | Stokes Frank, Chief Financial Officer | SSale | −5.30K | $27.32 | $145K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also CSTL’s full analysis or the market-wide insider trading feed. The tabs above jump to CSTL’s other SEC data.
Source: SEC Form 4 filings for CSTL, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.