CM
UCTT

Castleark Management’s Ultra Clean Holdings UCTT Stock Holding History

Castleark Management’s Portfolio UCTT Stock Details UCTT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$13.7M Sell
95,770
-4,360
-4% -$384K 0.37% 52
2026
Q1 		$6.23M Buy
+100,130
New +$5.13M 0.21% 121
2021
Q3 		– Sell
-128,849
Closed -$6.92M – 366
2021
Q2 		$6.92M Buy
+128,849
New +$6.9M 0.23% 118

Other funds holding UCTT

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
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 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
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $17.3B AUM 211.34% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Castleark Management's UCTT Position: Q2 2026 in Review

Castleark Management reduced its Ultra Clean Holdings (UCTT) stake by 4.4% in Q2 2026, selling an estimated $384K and leaving 95,770 shares worth $13.7M. The position accounts for 0.37% of the portfolio, ranked #52.

Castleark Management first reported a position in UCTT in Q2 2021 and has held it in 3 quarters since. 439 funds tracked by Wall St. Rank hold UCTT as of Q2 2026.

  • Castleark Management held 95,770 shares of Ultra Clean Holdings worth $13.7M as of Q2 2026.
  • Castleark Management sold 4,360 Ultra Clean Holdings shares in Q2 2026, an estimated $384K.
  • Ultra Clean Holdings made up 0.37% of Castleark Management's portfolio in Q2 2026, its #52 holding.
  • Castleark Management first reported a position in Ultra Clean Holdings in Q2 2021 and has held it in 3 quarters since.
  • 439 funds tracked by Wall St. Rank held Ultra Clean Holdings as of Q2 2026.

Based on Castleark Management's 13F filing for Q2 2026, filed 14 Aug 2026.