William Blair & Company
SIMO icon

William Blair & Company’s Silicon Motion SIMO Stock Holding History

William Blair & Company’s Portfolio SIMO Stock Details SIMO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$41.7M Buy
125,176
+21,997
+21% +$5.1M 0.11% 165
2026
Q1 		$11.6M Buy
+103,179
New +$12.5M 0.03% 325
2022
Q1 		– Sell
-2,358
Closed -$224K – 1992
2021
Q4 		$224K Buy
+2,358
New +$178K ﹤0.01% 1531
2021
Q2 		– Sell
-3,896
Closed -$231K – 1924
2021
Q1 		$231K Buy
+3,896
New +$222K ﹤0.01% 1430

Other funds holding SIMO

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Alkeon Capital Management
Alkeon Capital Management New York $74.1B AUM 71.18% 1-Year Est. Return
HRCM
Hawk Ridge Capital Management Los Angeles, California $3.12B AUM 53.42% 1-Year Est. Return
RP
Reinhart Partners Mequon, Wisconsin $4.38B AUM 55.55% 1-Year Est. Return
PCH
Polar Capital Holdings London, United Kingdom $42.4B AUM 181.11% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $17.3B AUM 211.34% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
WHCM
Wolf Hill Capital Management Greenwich, Connecticut $1.2B AUM 137.35% 1-Year Est. Return

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

William Blair & Company increased its Silicon Motion (SIMO) stake by 21% in Q2 2026, buying an estimated $5.1M and bringing the position to 125,176 shares worth $41.7M. The position accounts for 0.11% of the portfolio, ranked #165.

William Blair & Company first reported a position in SIMO in Q1 2021 and has held it in 4 quarters since. 384 funds tracked by Wall St. Rank hold SIMO as of Q2 2026.

  • William Blair & Company held 125,176 shares of Silicon Motion worth $41.7M as of Q2 2026.
  • William Blair & Company bought 21,997 Silicon Motion shares in Q2 2026, an estimated $5.1M.
  • Silicon Motion made up 0.11% of William Blair & Company's portfolio in Q2 2026, its #165 holding.
  • William Blair & Company first reported a position in Silicon Motion in Q1 2021 and has held it in 4 quarters since.
  • 384 funds tracked by Wall St. Rank held Silicon Motion as of Q2 2026.

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