MICHAEL SLUITER

CIK 1761731 · SVP of Reservoir Engineering · last filed 2026-06-01

MICHAEL SLUITER is a SVP of Reservoir Engineering who has filed 25 SEC Form 4 insider transactions across 1 company since 2019. The most recent filing, for GPOR, was dated Jun 1, 2026. Across all open-market trades the lifetime net is −$5.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.7M 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

$1.74M

Companies

1

Total Filings

25

Lifetime Open-Market Net

-$5.43M

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
GPOR	SVP of Reservoir Engineering	10,338	$168.01	$1.74M	-$5.43M	22	2026-06-01

Recent Filings

25 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
2026-06-01	GPOR	Grant (A)	+1,307	$0	EDGAR
2026-03-06	GPOR	Sell (S)	−2,055	-$437.9K	EDGAR
2026-03-05	GPOR	Notice (144)	−2,055	-$437.9K	EDGAR
2026-03-03	GPOR	Mixed	−9,268	-$2.45M	EDGAR
2026-03-02	GPOR	Notice (144)	−9,933	-$2.09M	EDGAR
2026-01-06	GPOR	Mixed	+9,933	-$1.65M	EDGAR
2025-05-14	GPOR	Notice (144)	−2,571	-$509.1K	EDGAR
2025-05-14	GPOR	Sell (S)	−2,571	-$509.1K	EDGAR
2025-03-04	GPOR	Mixed	+1,212	-$234.3K	EDGAR
2024-07-23	GPOR	Tax (F)	−1,227	-$193.8K	EDGAR

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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.