Owen W Robbins

Insider

First SEC filing: Feb. 4, 2004 · Latest: Feb. 4, 2004

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 6 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

6 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 8, 2006	MKSI	A	12,000	—	—	12,000 Direct	—	Acquired	(price as of 2026-08-20)
March 2, 2006	MKSI	M	8,592	—	—	34,500 Direct	-19.94%	Disposed	(price as of 2026-08-20)
March 2, 2006	MKSI	S	8,592	$22.65	$194,609	0 Direct	-100.00%	Disposed	1118.5% (price as of 2026-08-20)
March 2, 2006	MKSI	M	905	$8.00	$7,240	8,592 Direct	+11.77%	Acquired	3349.9% (price as of 2026-08-20)
March 2, 2006	MKSI	M	7,687	$4.43	$34,053	7,687 Direct	—	Acquired	6130.0% (price as of 2026-08-20)
May 9, 2005	MKSI	A	12,000	—	—	12,000 Direct	—	Acquired	(price as of 2026-08-20)
May 13, 2004	MKSI	A	12,000	—	—	12,000 Direct	—	Acquired	(price as of 2026-08-20)

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.

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 8, 2006	MKSI	Director Stock Option (Right to Buy) 2006	Common (12,000)	$24.35	May 8, 2016	12,000	Acquired
March 2, 2006	MKSI	Director Stock option (right to buy)	Common (8,592)	—	Aug. 8, 1988	8,592	Disposed
May 9, 2005	MKSI	Director Stock Option 2005 (right to buy)	Common (12,000)	$15.84	May 8, 2015	12,000	Acquired
May 13, 2004	MKSI	Director Stock Option (Right to Buy)	Common (12,000)	$20.07	May 14, 2014	12,000	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).