UOC
ACMR icon

UBS O'Connor’s ACM Research ACMR Stock Holding History

UBS O'Connor’s Portfolio ACMR Stock Details ACMR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		$1.42M Sell
35,958
-43,438
-55% -$1.62M 0.04% 132
2025
Q3 		$3.11M Sell
79,396
-12,725
-14% -$378K 0.09% 96
2025
Q2 		$2.39M Buy
+92,121
New +$2.07M 0.06% 143
2021
Q3 		– Sell
-15,000
Closed -$511K – 916
2021
Q2 		$511K Buy
+15,000
New +$412K ﹤0.01% 612
2020
Q3 		– Sell
-127,221
Closed -$2.65M – 323
2020
Q2 		$2.65M Buy
+127,221
New +$2.09M 0.06% 205

Other funds holding ACMR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
LSV Asset Management
LSV Asset Management Chicago, Illinois $55.1B AUM 45.38% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
TC
Triata Capital Hong Kong $588M AUM 8.92% 1-Year Est. Return
SAM
Southeastern Asset Management Memphis, Tennessee $1.92B AUM 6.41% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London $209B AUM 37.72% 1-Year Est. Return

UBS O'Connor's ACMR Position: Q4 2025 in Review

UBS O'Connor reduced its ACM Research (ACMR) stake by 55% in Q4 2025, selling an estimated $1.62M and leaving 35,958 shares worth $1.42M. The position accounts for 0.04% of the portfolio, ranked #132.

UBS O'Connor first reported a position in ACMR in Q2 2020 and has held it in 5 quarters since. The position peaked at $3.11M in Q3 2025. 277 funds tracked by Wall St. Rank hold ACMR as of Q4 2025.

  • UBS O'Connor held 35,958 shares of ACM Research worth $1.42M as of Q4 2025.
  • UBS O'Connor sold 43,438 ACM Research shares in Q4 2025, an estimated $1.62M.
  • ACM Research made up 0.04% of UBS O'Connor's portfolio in Q4 2025, its #132 holding.
  • UBS O'Connor first reported a position in ACM Research in Q2 2020 and has held it in 5 quarters since.
  • UBS O'Connor's ACM Research position peaked at $3.11M in Q3 2025.
  • 277 funds tracked by Wall St. Rank held ACM Research as of Q4 2025.

Based on UBS O'Connor's 13F filing for Q4 2025, filed 13 Feb 2026.