MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q4 2025
Shares 839,773 Value ($000) $134,196 Avg Close $148.21 Range $120.73 - $170.37
Q3 2025
Shares 323,364 Value ($000) $40,023 Avg Close $106.31 Range $88.17 - $132.24
Q3 2024
Shares 24,100 Value ($000) $2,620 Avg Close $117.45 Range $99.10 - $145.63
Q2 2024
Shares 24,100 Value ($000) $3,147 Avg Close $124.55 Range $105.72 - $137.52
Q1 2024
Shares 620,063 Value ($000) $82,468 Avg Close $114.51 Range $94.23 - $132.85
Q4 2023
Shares 589,715 Value ($000) $60,664 Avg Close $79.84 Range $62.28 - $104.49
Q3 2022
Shares 768,447 Value ($000) $63,504 Avg Close $100.01 Range $79.23 - $120.27
Q2 2022
Shares 707,160 Value ($000) $72,576 Avg Close $112.92 Range $94.75 - $148.07
Q1 2022
Shares 576,643 Value ($000) $86,496 Avg Close $150.35 Range $131.30 - $175.09
Q4 2021
Shares 551,693 Value ($000) $96,088 Avg Close $151.09 Range $136.06 - $172.80
Q3 2021
Shares 553,972 Value ($000) $83,600 Avg Close $148.13 Range $133.76 - $168.78
Q2 2021
Shares 358,003 Value ($000) $63,707 Avg Close $175.09 Range $158.98 - $192.11
Q1 2021
Shares 324,457 Value ($000) $60,161 Avg Close $161.78 Range $138.78 - $185.00
Q4 2020
Shares 328,725 Value ($000) $49,457 Avg Close $125.75 Range $101.82 - $152.08
Q3 2020
Shares 290,996 Value ($000) $31,785 Avg Close $112.47 Range $97.77 - $124.64
Q2 2020
Shares 204,635 Value ($000) $23,173 Avg Close $95.31 Range $70.45 - $112.06
Q1 2020
Shares 254,990 Value ($000) $20,769 Avg Close $97.84 Range $64.00 - $116.86
Q4 2019
Shares 211,735 Value ($000) $23,293 Avg Close $99.99 Range $81.07 - $109.78
Q4 2018
Shares 190,652 Value ($000) $12,318 Avg Close $68.31 Range $53.35 - $77.61
Q3 2018
Shares 302,851 Value ($000) $24,274 Avg Close $86.11 Range $74.38 - $97.19
Q1 2018
Shares 155,116 Value ($000) $17,939 Avg Close $103.13 Range $88.32 - $120.60
Q3 2017
Shares 148,418 Value ($000) $14,018 Avg Close $76.52 Range $62.45 - $89.48