NEW YORK ( TheStreet) -- Quest Software (Nasdaq: QSFT) is trading at unusually high volume Thursday with 4.1 million shares changing hands. It is currently at 4.6 times its average daily volume and trading up $2.14 (+9%) at $26 as of 9:30 a.m. ET. Quest Software has a market cap of $2.02 billion and is part of the technology sector and computer software & services industry. Shares are up 29.6% year to date as of the close of trading on Wednesday. Quest Software, Inc. designs, develops, markets, distributes, and supports enterprise systems management software products worldwide. The company has a P/E ratio of 48.9, equal to the average computer software & services industry P/E ratio and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Quest Software as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, expanding profit margins and solid stock price performance. We feel these strengths outweigh the fact that the company has had sub par growth in net income. You can view the full Quest Software Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.