GAMCO Investors’s MKS Inc MKSI Stock Holding History

GAMCO Investors’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	$891K	Sell	3,875 -10	-0.3%	-$2.26K	0.01%	646
2025 Q4	$621K	Sell	3,885 -4,000	-51%	-$593K	0.01%	756
2025 Q3	$976K	Sell	7,885 -600	-7%	-$64K	0.01%	649
2025 Q2	$843K	Sell	8,485 -60	-0.7%	-$4.88K	0.01%	701
2025 Q1	$685K	Buy	8,545 +4,485	+110%	+$453K	0.01%	626
2024 Q4	$424K	Buy	4,060 +1,100	+37%	+$119K	﹤0.01%	720
2024 Q3	$322K	Buy	+2,960	New	+$352K	﹤0.01%	767
2013 Q3	–	Sell	-8,000	Closed	-$212K	–	825
2013 Q2	$212K	Buy	+8,000	New	+$216K	﹤0.01%	765

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

GAMCO Investors's MKSI Position: Q1 2026 in Review

GAMCO Investors reduced its MKS Inc (MKSI) stake by 0.26% in Q1 2026, selling an estimated $2.26K and leaving 3,875 shares worth $891K. The position accounts for 0.01% of the portfolio, ranked #646.

GAMCO Investors first reported a position in MKSI in Q2 2013 and has held it in 8 quarters since. The position peaked at $976K in Q3 2025. 615 funds tracked by Wall St. Rank hold MKSI as of Q1 2026.

GAMCO Investors held 3,875 shares of MKS Inc worth $891K as of Q1 2026.
GAMCO Investors sold 10 MKS Inc shares in Q1 2026, an estimated $2.26K.
MKS Inc made up 0.01% of GAMCO Investors's portfolio in Q1 2026, its #646 holding.
GAMCO Investors first reported a position in MKS Inc in Q2 2013 and has held it in 8 quarters since.
GAMCO Investors's MKS Inc position peaked at $976K in Q3 2025.
615 funds tracked by Wall St. Rank held MKS Inc as of Q1 2026.

Based on GAMCO Investors's 13F filing for Q1 2026, filed 14 May 2026.