PEAK6
MKSI icon

PEAK6’s MKS Inc MKSI Stock Holding History

PEAK6’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
Q1 		$23M Sell
100,200
-13,900
-12% -$3.14M 0.05% 316
2025
Q4 		$18.2M Buy
114,100
+52,600
+86% +$7.8M 0.03% 401
2025
Q3 		$7.61M Buy
61,500
+20,200
+49% +$2.15M 0.01% 830
2025
Q2 		$4.1M Buy
41,300
+3,900
+10% +$317K 0.01% 1061
2025
Q1 		$3M Sell
37,400
-15,100
-29% -$1.52M 0.01% 1199
2024
Q4 		$5.48M Buy
+52,500
New +$5.67M 0.01% 857

Other funds holding MKSI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

PEAK6's MKSI Position: Q4 2025 in Review

PEAK6 sold out of MKS Inc (MKSI) in Q4 2025, closing a stake of 20,547 shares — an estimated $3.05M sold.

PEAK6 first reported a position in MKSI in Q4 2024 and held it in 3 quarters. The position peaked at $2.54M in Q3 2025. 513 funds tracked by Wall St. Rank hold MKSI as of Q4 2025.

  • PEAK6 reported no remaining MKS Inc position as of Q4 2025 after selling out during the quarter.
  • PEAK6 sold 20,547 MKS Inc shares in Q4 2025, an estimated $3.05M.
  • PEAK6 first reported a position in MKS Inc in Q4 2024 and held it in 3 quarters.
  • PEAK6's MKS Inc position peaked at $2.54M in Q3 2025.
  • 513 funds tracked by Wall St. Rank held MKS Inc as of Q4 2025.

Based on PEAK6's 13F filing for Q4 2025, filed 13 Feb 2026.