MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

STEPH & CO's Holding History (CIK: 0000941519)

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

Q4 2025

Shares 1,162 Value ($000) $186 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 553 Value ($000) $68 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 424 Value ($000) $42 Avg Close $80.86 Range $54.50 - $100.44

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,162	$186	$148.21	$120.73 - $170.37
Q3 2025	553	$68	$106.31	$88.17 - $132.24
Q2 2025	424	$42	$80.86	$54.50 - $100.44