MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

PEAK6 LLC's Holding History (CIK: 0001389958)

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

Q3 2025

Shares 20,547 Value ($000) $2,543 Avg Close $106.31 Range $88.17 - $132.24

Q1 2025

Shares 19,312 Value ($000) $1,548 Avg Close $100.21 Range $75.89 - $124.28

Q4 2024

Shares 770 Value ($000) $80 Avg Close $106.91 Range $96.54 - $118.37

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	20,547	$2,543	$106.31	$88.17 - $132.24
Q1 2025	19,312	$1,548	$100.21	$75.89 - $124.28
Q4 2024	770	$80	$106.91	$96.54 - $118.37