DEREK J MAETZOLD

CIK 1239501 · Pres. & Chief Exec. Officer · last filed 2026-08-06

DEREK J MAETZOLD is a Pres. & Chief Exec. Officer who has filed 225 SEC Form 4 insider transactions across 2 companies since 2007. The most recent filing, for CSTL, was dated Aug 6, 2026. Across all open-market trades the lifetime net is −$93.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.0M across reported positions.

"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.

Disclosed Exposure

$2.01M

Companies

2

Total Filings

225

Lifetime Open-Market Net

-$93.87M

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	65,051	$30.87	$2.01M	-$93.87M	191	2026-08-06
ENCYSIVE PHARMACEUTICALS INC (ENCY) Delisted	V.P., Marketing & Sales	0	—	—	$0	4	2008-04-03

Recent Filings

225 filings

Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.

Filed	Symbol	Action	Net Shares	Net $	Link
2026-08-06	CSTL	Mixed	−16,114	-$1.16M	EDGAR
2026-08-04	CSTL	Mixed	−11,502	-$826.5K	EDGAR
2026-07-31	CSTL	Notice (144)	−67,662	-$1.89M	EDGAR
2026-07-29	CSTL	Mixed	−3,622	-$222.8K	EDGAR
2026-07-16	CSTL	Mixed	−3,622	-$94.3K	EDGAR
2026-07-06	CSTL	Mixed	−3,622	-$224.1K	EDGAR
2026-07-01	CSTL	Notice (144)	−23,844	-$589.2K	EDGAR
2026-06-17	CSTL	Mixed	−3,622	-$84.9K	EDGAR
2026-06-03	CSTL	Mixed	−3,622	-$190.3K	EDGAR
2026-06-01	CSTL	Notice (144)	−14,008	-$293.7K	EDGAR

Showing 1–10 of 225

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Form 4 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.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.