Jane Street
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Jane Street’s MKS Inc MKSI Stock Holding History

Jane Street’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 		$2.64M Sell
11,500
-1,500
-12% -$339K ﹤0.01% 4573
2025
Q4 		$2.08M Buy
13,000
+5,200
+67% +$771K ﹤0.01% 4743
2025
Q3 		$965K Sell
7,800
-2,600
-25% -$277K ﹤0.01% 6383
2025
Q2 		$1.03M Buy
10,400
+6,800
+189% +$553K ﹤0.01% 5552
2025
Q1 		$289K Buy
3,600
+1,600
+80% +$162K ﹤0.01% 7874
2024
Q4 		$209K Buy
+2,000
New +$216K ﹤0.01% 8340
2024
Q3 		– Sell
-8,200
Closed -$1.07M – 10096
2024
Q2 		$1.07M Buy
+8,200
New +$1.03M ﹤0.01% 5635
2024
Q1 		– Sell
-2,400
Closed -$247K – 9744
2023
Q4 		$247K Sell
2,400
-800
-25% -$65K ﹤0.01% 7919
2023
Q3 		$277K Buy
+3,200
New +$312K ﹤0.01% 7178
2023
Q1 		– Sell
-6,400
Closed -$542K – 9571
2022
Q4 		$542K Sell
6,400
-7,500
-54% -$601K ﹤0.01% 5984
2022
Q3 		$1.15M Buy
13,900
+9,700
+231% +$999K ﹤0.01% 5166
2022
Q2 		$431K Sell
4,200
-44,100
-91% -$5.14M ﹤0.01% 6993
2022
Q1 		$7.25M Buy
48,300
+7,600
+19% +$1.18M ﹤0.01% 2454
2021
Q4 		$7.09M Buy
40,700
+33,300
+450% +$5.21M ﹤0.01% 2341
2021
Q3 		$1.12M Buy
7,400
+300
+4% +$46.1K ﹤0.01% 5697
2021
Q2 		$1.26M Buy
7,100
+900
+15% +$164K ﹤0.01% 5306
2021
Q1 		$1.15M Sell
6,200
-16,500
-73% -$2.77M ﹤0.01% 5194
2020
Q4 		$3.42M Buy
+22,700
New +$2.97M ﹤0.01% 2634
2020
Q3 		– Sell
-14,700
Closed -$1.67M – 7622
2020
Q2 		$1.67M Buy
+14,700
New +$1.46M ﹤0.01% 3315
2018
Q3 		– Sell
-2,800
Closed -$268K – 5480
2018
Q2 		$268K Buy
+2,800
New +$305K ﹤0.01% 4252

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

Jane Street's MKSI Position: Q1 2026 in Review

Jane Street reduced its MKS Inc (MKSI) stake by 37% in Q1 2026, selling an estimated $31.6M and leaving 243,253 shares worth $55.9M. The position accounts for 0.01% of the portfolio, ranked #980.

Jane Street first reported a position in MKSI in Q2 2013 and has held it in 31 quarters since. The position peaked at $61.2M in Q4 2025. 615 funds tracked by Wall St. Rank hold MKSI as of Q1 2026.

  • Jane Street held 243,253 shares of MKS Inc worth $55.9M as of Q1 2026.
  • Jane Street sold 139,862 MKS Inc shares in Q1 2026, an estimated $31.6M.
  • MKS Inc made up 0.01% of Jane Street's portfolio in Q1 2026, its #980 holding.
  • Jane Street first reported a position in MKS Inc in Q2 2013 and has held it in 31 quarters since.
  • Jane Street's MKS Inc position peaked at $61.2M in Q4 2025.
  • 615 funds tracked by Wall St. Rank held MKS Inc as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.