Westfield Capital Management
MKSI icon

Westfield Capital Management’s MKS Inc MKSI Stock Holding History

Westfield Capital Management’s Portfolio MKSI Stock Details MKSI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$413M Sell
928,617
-118,146
-11% -$37M 1.35% 13
2026
Q1 		$241M Buy
1,046,763
+206,990
+25% +$46.8M 1.01% 17
2025
Q4 		$134M Buy
839,773
+516,409
+160% +$76.6M 0.56% 42
2025
Q3 		$40M Buy
+323,364
New +$34.5M 0.17% 167
2024
Q4 		– Sell
-24,100
Closed -$2.62M – 259
2024
Q3 		$2.62M Hold
24,100
– – 0.01% 221
2024
Q2 		$3.15M Sell
24,100
-595,963
-96% -$75.2M 0.02% 220
2024
Q1 		$82.5M Buy
620,063
+30,348
+5% +$3.53M 0.43% 82
2023
Q4 		$60.7M Buy
+589,715
New +$47.9M 0.35% 112
2022
Q4 		– Sell
-768,447
Closed -$63.5M – 245
2022
Q3 		$63.5M Buy
768,447
+61,287
+9% +$6.31M 0.5% 71
2022
Q2 		$72.6M Buy
707,160
+130,517
+23% +$15.2M 0.57% 56
2022
Q1 		$86.5M Buy
576,643
+24,950
+5% +$3.88M 0.55% 62
2021
Q4 		$96.1M Sell
551,693
-2,279
-0.4% -$356K 0.57% 56
2021
Q3 		$83.6M Buy
553,972
+195,969
+55% +$30.1M 0.5% 72
2021
Q2 		$63.7M Buy
358,003
+33,546
+10% +$6.09M 0.38% 97
2021
Q1 		$60.2M Sell
324,457
-4,268
-1% -$717K 0.37% 97
2020
Q4 		$49.5M Buy
328,725
+37,729
+13% +$4.94M 0.29% 118
2020
Q3 		$31.8M Buy
290,996
+86,361
+42% +$10.1M 0.21% 140
2020
Q2 		$23.2M Sell
204,635
-50,355
-20% -$5.01M 0.16% 161
2020
Q1 		$20.8M Buy
254,990
+43,255
+20% +$4.43M 0.18% 142
2019
Q4 		$23.3M Buy
+211,735
New +$22.2M 0.17% 151
2019
Q1 		– Sell
-190,652
Closed -$12.3M – 267
2018
Q4 		$12.3M Sell
190,652
-112,199
-37% -$8.11M 0.11% 181
2018
Q3 		$24.3M Buy
+302,851
New +$27.7M 0.17% 166
2018
Q2 		– Sell
-155,116
Closed -$17.9M – 261
2018
Q1 		$17.9M Buy
+155,116
New +$17M 0.14% 184
2017
Q4 		– Sell
-148,418
Closed -$14M – 259
2017
Q3 		$14M Buy
+148,418
New +$12.1M 0.11% 197

Other funds holding MKSI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
AMH
Aspex Management (HK) Central, Hong Kong $8.89B AUM 39.91% 1-Year Est. Return

Westfield Capital Management's MKSI Position: Q2 2026 in Review

Westfield Capital Management reduced its MKS Inc (MKSI) stake by 11% in Q2 2026, selling an estimated $37M and leaving 928,617 shares worth $413M. The position accounts for 1.35% of the portfolio, ranked #13.

Westfield Capital Management first reported a position in MKSI in Q3 2017 and has held it in 24 quarters since. 773 funds tracked by Wall St. Rank hold MKSI as of Q2 2026.

  • Westfield Capital Management held 928,617 shares of MKS Inc worth $413M as of Q2 2026.
  • Westfield Capital Management sold 118,146 MKS Inc shares in Q2 2026, an estimated $37M.
  • MKS Inc made up 1.35% of Westfield Capital Management's portfolio in Q2 2026, its #13 holding.
  • Westfield Capital Management first reported a position in MKS Inc in Q3 2017 and has held it in 24 quarters since.
  • 773 funds tracked by Wall St. Rank held MKS Inc as of Q2 2026.

Based on Westfield Capital Management's 13F filing for Q2 2026, filed 12 Aug 2026.