Darrell E Hollek

Insider

First SEC filing: June 13, 2018 · Latest: June 13, 2018

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 7 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
May 13, 2025	OIS	A	31,185	—	—	146,584 Direct	+27.02%	Acquired	(price as of 2026-08-19)
May 7, 2024	OIS	A	33,259	—	—	115,399 Direct	+40.49%	Acquired	(price as of 2026-08-19)
May 9, 2023	OIS	A	21,708	—	—	82,140 Direct	+35.92%	Acquired	(price as of 2026-08-19)
May 10, 2022	OIS	A	19,470	—	—	60,432 Direct	+47.53%	Acquired	(price as of 2026-08-19)
May 11, 2021	OIS	A	19,470	—	—	40,962 Direct	+90.59%	Acquired	(price as of 2026-08-19)
May 12, 2020	OIS	A	11,211	—	—	21,492 Direct	+109.05%	Acquired	(price as of 2026-08-19)
May 7, 2019	OIS	A	6,710	—	—	10,281 Direct	+187.90%	Acquired	(price as of 2026-08-19)

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.

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
June 13, 2018	OIS	Common Stock	3,571	Direct
June 13, 2018	OIS	Common Stock→ Common Stock (0)	0	Direct
April 26, 2016	WES	Common Units representing limited partner interests	7,608	Direct
May 14, 2015	WES	Common Units representing limited partner interests	7,500	Direct