Durham Mark

CIK 2073180 · Chief Accounting Officer · last filed 2026-04-02

Durham Mark is a Chief Accounting Officer who has filed 4 SEC Form 4 insider transactions across 2 companies since 2025. The most recent filing, for GTLS, was dated Apr 2, 2026. Current disclosed insider exposure totals $730.9K 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

$730.9K

Companies

2

Total Filings

4

Lifetime Open-Market Net

$0

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
GTLS	Chief Accounting Officer	3,526	$207.29	$730.9K	$0	2	2026-04-02
GTLSpB	Chief Accounting Officer	1,853	$72.29	—	$0	2	2025-11-13

Recent Filings

4 filings

Form 4 transactions across all companies, newest first.

Filed	Symbol	Action	Net Shares	Net $	Link
2026-04-02	GTLS	Mixed	+344	-$71.4K	EDGAR
2026-01-06	GTLS	Mixed	+984	-$13.6K	EDGAR
2025-11-13	GTLSpB	Tax (F)	−117	-$23.7K	EDGAR
2025-07-15	GTLSpB	Grant (A)	+640	$0	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.