MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

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

Q2 2023

Shares 1,028,945 Value ($000) $111,229 Avg Close $89.53 Range $77.81 - $108.20

Q1 2023

Shares 897,047 Value ($000) $79,496 Avg Close $93.12 Range $80.00 - $111.27

Q4 2022

Shares 888,251 Value ($000) $75,262 Avg Close $78.00 Range $62.97 - $89.22

Q3 2022

Shares 951,727 Value ($000) $78,651 Avg Close $100.01 Range $79.23 - $120.27

Q2 2022

Shares 1,054,053 Value ($000) $108,177 Avg Close $112.92 Range $94.75 - $148.07

Q1 2022

Shares 1,086,973 Value ($000) $163,046 Avg Close $150.35 Range $131.30 - $175.09

Q4 2021

Shares 692,650 Value ($000) $120,639 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 121,576 Value ($000) $18,347 Avg Close $148.13 Range $133.76 - $168.78

Q2 2021

Shares 88,902 Value ($000) $15,820 Avg Close $175.09 Range $158.98 - $192.11

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2023	1,028,945	$111,229	$89.53	$77.81 - $108.20
Q1 2023	897,047	$79,496	$93.12	$80.00 - $111.27
Q4 2022	888,251	$75,262	$78.00	$62.97 - $89.22
Q3 2022	951,727	$78,651	$100.01	$79.23 - $120.27
Q2 2022	1,054,053	$108,177	$112.92	$94.75 - $148.07
Q1 2022	1,086,973	$163,046	$150.35	$131.30 - $175.09
Q4 2021	692,650	$120,639	$151.09	$136.06 - $172.80
Q3 2021	121,576	$18,347	$148.13	$133.76 - $168.78
Q2 2021	88,902	$15,820	$175.09	$158.98 - $192.11