NEW YORK ( TheStreet) -- Monolithic Power Systems (Nasdaq: MPWR) is trading at unusually high volume Wednesday with 1.4 million shares changing hands. It is currently at 4.4 times its average daily volume and trading up $1.09 (+8.5%) at $13.85 as of 2:56 p.m. ET. Monolithic Power Systems has a market cap of $453.4 million and is part of the technology sector and electronics industry. Shares are down 22.8% year to date as of the close of trading on Tuesday. Monolithic Power Systems, Inc. designs, develops, manufactures, and markets analog and mixed-signal semiconductors. The company has a P/E ratio of 20, above the average electronics industry P/E ratio of 19.7 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Monolithic Power Systems as a hold. The company's strengths can be seen in multiple areas, such as its largely solid financial position with reasonable debt levels by most measures and expanding profit margins. However, as a counter to these strengths, we also find weaknesses including a generally disappointing performance in the stock itself, deteriorating net income and disappointing return on equity. You can view the full Monolithic Power Systems Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are rising on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVUP to 95370 or select from multiple alert options.