Mark Durham
CIK 2073180 · View on SEC EDGAR ↗
Insider
First SEC filing: June 13, 2025 · Latest: July 15, 2025
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Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 4 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| July 16, 2026 | GTLS | D | 1,895 | — | — | 0 Direct | -100.00% | Disposed | |
| July 16, 2026 | GTLS | D | 3,074 | $210.00 | $645,540 | 0 Direct | -100.00% | Disposed | |
| July 10, 2026 | GTLS | F | 107 | $209.87 | $22,456 | 3,074 Direct | -3.36% | Disposed | |
| July 11, 2025 | GTLS | A | 640 | — | — | 1,970 Direct | +48.12% | Acquired |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| July 16, 2026 | GTLS | Restricted Stock Units | Common Stock (1,895) | — | — | 1,895 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 3 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| June 13, 2025 | GTLS | Common stock, par value $0.01 per share | 1,330 | Direct |
| June 13, 2025 | GTLS | Stock Option (Right to Buy)→ Common Stock (560) | 560 | Direct |
| June 13, 2025 | GTLS | Stock Option (Right to Buy)→ Common Stock (400) | 400 | Direct |