William Blair & Company
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William Blair & Company’s United Microelectronic UMC Stock Holding History

William Blair & Company’s Portfolio UMC Stock Details UMC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$297K Sell
10,899
-2,199
-17% -$37.6K ﹤0.01% 1424
2026
Q1 		$118K Buy
+13,098
New +$128K ﹤0.01% 1569

Other funds holding UMC

BlackRock
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UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Rafferty Asset Management
Rafferty Asset Management New York $43.9B AUM 121.74% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Man Group
Man Group London, United Kingdom $62.7B AUM 29.77% 1-Year Est. Return

William Blair & Company's UMC Position: Q2 2026 in Review

William Blair & Company reduced its United Microelectronic (UMC) stake by 17% in Q2 2026, selling an estimated $37.6K and leaving 10,899 shares worth $297K. The position accounts for ﹤0.01% of the portfolio, ranked #1424.

William Blair & Company first reported a position in UMC in Q1 2026 and has held it in 2 quarters since. 362 funds tracked by Wall St. Rank hold UMC as of Q2 2026.

  • William Blair & Company held 10,899 shares of United Microelectronic worth $297K as of Q2 2026.
  • William Blair & Company sold 2,199 United Microelectronic shares in Q2 2026, an estimated $37.6K.
  • United Microelectronic made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1424 holding.
  • William Blair & Company first reported a position in United Microelectronic in Q1 2026 and has held it in 2 quarters since.
  • 362 funds tracked by Wall St. Rank held United Microelectronic as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.