Insider Trading
Current insider transactions (SEC Form 4) — buys and sells by officers, directors, and major shareholders.
| Ticker | Insider | Title | Date | Transaction | Price ($) | Shares | Value ($) | SEC Form 4 |
|---|---|---|---|---|---|---|---|---|
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 25.06 | 10 | 251 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 25.06 | 43 | 1,078 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 25.06 | 50 | 1,253 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 25.06 | 232 | 5,814 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 24.13 | 268 | 6,467 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 24.13 | 1,110 | 26,784 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 24.13 | 1,307 | 31,538 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/27/2026 | Verkauf | 24.13 | 5,982 | 144,346 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/14/2026 | Verkauf | 22.92 | 278 | 6,372 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/14/2026 | Verkauf | 22.92 | 1,153 | 26,427 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/14/2026 | Verkauf | 22.92 | 1,357 | 31,102 | Form 4 |
| CSTL | Maetzold Derek J | Pres. & Chief Exec. Officer | 07/14/2026 | Verkauf | 22.92 | 550 | 12,606 | Form 4 |
| CSTL | Derek J Maetzold | Insider | 04/21/2026 | Verkauf | 25.10 | 550 | 13,805 | Form 4 |
| CSTL | Derek J Maetzold | Insider | 04/21/2026 | Verkauf | 25.10 | 3,622 | 90,912 | Form 4 |
A compact market overview — not investment advice. Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q).