MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

Old West Investment Management, LLC's Holding History (CIK: 0001549358)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 16,350 Value ($000) $2,613 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 15,849 Value ($000) $1,962 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 6,794 Value ($000) $675 Avg Close $80.86 Range $54.50 - $100.44

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	16,350	$2,613	$148.21	$120.73 - $170.37
Q3 2025	15,849	$1,962	$106.31	$88.17 - $132.24
Q2 2025	6,794	$675	$80.86	$54.50 - $100.44