MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

Quantum Portfolio Management LLC's Holding History (CIK: 0002003672)

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

Q4 2025

Shares 2,888 Value ($000) $462 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 4,761 Value ($000) $589 Avg Close $106.31 Range $88.17 - $132.24

Q1 2024

Shares 3,369 Value ($000) $448 Avg Close $114.51 Range $94.23 - $132.85

Q4 2023

Shares 3,388 Value ($000) $349 Avg Close $79.84 Range $62.28 - $104.49

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2,888	$462	$148.21	$120.73 - $170.37
Q3 2025	4,761	$589	$106.31	$88.17 - $132.24
Q1 2024	3,369	$448	$114.51	$94.23 - $132.85
Q4 2023	3,388	$349	$79.84	$62.28 - $104.49