DEREK J MAETZOLD
CIK 1239501 · Pres. & Chief Exec. Officer · last filed 2026-06-03
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Loading insider history…
Disclosed Exposure
$1.34M
Companies
2
Total Filings
189
Lifetime Open-Market Net
-$91.13M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| CSTL | Pres. & Chief Exec. Officer | 64,601 | $20.70 | $1.34M | -$91.13M | 185 | 2026-06-03 |
| ENCYSIVE PHARMACEUTICALS INC (ENCY) Delisted | V.P., Marketing & Sales | 0 | — | — | $0 | 4 | 2008-04-03 |
Recent Filings · Page 13 of 19
189 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-09-15 | CSTL | Sell (S) | −26,667 | -$1.97M | EDGAR |
| 2021-09-02 | CSTL | Sell (S) | −15,000 | -$1.14M | EDGAR |
| 2021-08-31 | CSTL | Sell (S) | −30,000 | -$2.23M | EDGAR |
| 2021-08-25 | CSTL | Sell (S) | −7,500 | -$529.3K | EDGAR |
| 2021-08-19 | CSTL | Sell (S) | −12,500 | -$747.3K | EDGAR |
| 2021-08-17 | CSTL | Sell (S) | −25,000 | -$1.58M | EDGAR |
| 2021-08-06 | CSTL | Sell (S) | −4,020 | -$282.8K | EDGAR |
| 2021-08-03 | CSTL | Sell (S) | −3,480 | -$244.3K | EDGAR |
| 2021-07-23 | CSTL | Sell (S) | −12,500 | -$850.6K | EDGAR |
| 2021-07-21 | CSTL | Sell (S) | −25,000 | -$1.63M | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.