Monolithic Power Systems Inc (MPWR) entered the Favored Zone in the SIA S&P 500 Index Report earlier this year on May 13th when the price was $737.73. MPWR shares have continued to remain strong and has consistently moved up the rankings in the SIA S&P 500 Index Report rising 12 spots in the last day, 29 spots in the last week, 7 spots in the last month and a whooping 173 spots in the last quarter. Currently the shares reside in the 83rd spot in the report with a closing price of yesterday at $830.63. This represents an increase of 12.6% since its entry in the favored.