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	$8.62M	Buy	37,500 +28,500	+317%	+$6.44M	0.02%	643
2025 Q4	$1.44M	Buy	+9,000	New	+$1.34M	﹤0.01%	1601
2025 Q3	–	Sell	-200	Closed	-$19.9K	–	3262
2025 Q2	$19.9K	Sell	200 -28,400	-99%	-$2.31M	﹤0.01%	2757
2025 Q1	$2.29M	Buy	28,600 +9,400	+49%	+$949K	0.01%	1348
2024 Q4	$2M	Buy	+19,200	New	+$2.07M	﹤0.01%	1411

Other funds holding MKSI

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

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 Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

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.