[Silicon Motion Announces Results for the Period Ended December 31, 2011 Fourth Quarter 2011 Financial Highlights • Net sales increased 6% quarter-over-quarter to US$67.1 million from US$63.2 million in 3Q11 • Gross margin (non-GAAP 1 ) increased to 49.8% from 49.4% in 3Q11 • Operating expenses (non-GAAP) increased to US$16.6 million from US$14.8 million in 3Q11 • Operating margin (non-GAAP)] [Press Release issued by the Company on February 2, 2012 ILICON]

[Silicon Motion Announces Results for the Period Ended September 30, 2011 Third Quarter 2011 Financial Highlights • Net sales increased 25% quarter-over-quarter to US$63.2 million from US$50.5 million in 2Q11 • Gross margin excluding stock-based compensation increased to 49.4% from 46.9% in 2Q11 • Operating expenses excluding stock-based compensation, acquisition-related charges, and other items increased to US$14.8 million from US$13.1] [Press Release issued by the Company on November 2, 2011. ILICON OTION ECHNOLOGY ORPORATION S]

[Silicon Motion Announces Results for the Period Ended June 30, 2011 Second Quarter 2011 Financial Highlights • Net sales increased 16% quarter-over-quarter to US$50.5 million from US$43.4 million in 1Q11 • Gross margin excluding stock-based compensation increased to 46.9% from 46.2% in 1Q11 • Operating expenses excluding stock-based compensation, acquisition-related charges, and other items decreased to US$13.1 million from US$13.4] [Press Release issued by the Company on July 28, 2011.]