NEW YORK ( TheStreet) -- NutriSystem (Nasdaq: NTRI) is trading at unusually high volume Tuesday with 1.9 million shares changing hands. It is currently at four times its average daily volume and trading up 49 cents (+3.7%) at $13.72 as of 3:22 p.m. ET. NutriSystem has a market cap of $371.2 million and is part of the services sector and diversified services industry. Shares are down 37.1% year to date as of the close of trading on Monday. Nutrisystem, Inc. provides weight management products and services primarily in the United States and Canada. The company's weight management program principally comprises a pre-packaged food program, online tools, and counseling. The company has a P/E ratio of 12.3, below the average diversified services industry P/E ratio of 12.4 and below the S&P 500 P/E ratio of 21.8. TheStreet Ratings rates NutriSystem as a buy. The company's strengths can be seen in multiple areas, such as its impressive record of earnings per share growth, compelling growth in net income, notable return on equity, reasonable valuation levels and expanding profit margins. Although no company is perfect, currently we do not see any significant weaknesses which are likely to detract from the generally positive outlook. You can view the full NutriSystem Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.