MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

MAI Capital Management's Holding History (CIK: 0001040197)

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

Q4 2025

Shares 1,103 Value ($000) $176 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 1,057 Value ($000) $131 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 956 Value ($000) $95 Avg Close $80.86 Range $54.50 - $100.44

Q1 2025

Shares 850 Value ($000) $68 Avg Close $100.21 Range $75.89 - $124.28

Q4 2024

Shares 875 Value ($000) $91 Avg Close $106.91 Range $96.54 - $118.37

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,103	$176	$148.21	$120.73 - $170.37
Q3 2025	1,057	$131	$106.31	$88.17 - $132.24
Q2 2025	956	$95	$80.86	$54.50 - $100.44
Q1 2025	850	$68	$100.21	$75.89 - $124.28
Q4 2024	875	$91	$106.91	$96.54 - $118.37