NEW YORK ( TheStreet) -- Weight Watchers International (NYSE: WTW) is trading at unusually high volume Thursday with 4.8 million shares changing hands. It is currently at 4.3 times its average daily volume and trading up $8.21 (+14.2%) at $65.90 as of 1:25 p.m. ET. Weight Watchers International has a market cap of $3.96 billion and is part of the services sector and diversified services industry. Shares are up 4.9% year to date as of the close of trading on Wednesday. Weight Watchers International, Inc. provides weight management services worldwide. It offers various services and products that are built upon its weight management plans comprising nutritional, exercise, and behavioral tools and approaches. The company has a P/E ratio of 13.7, equal to the average diversified services industry P/E ratio and below the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Weight Watchers International as a buy. The company's strengths can be seen in multiple areas, such as its robust revenue growth, impressive record of earnings per share growth, expanding profit margins, good cash flow from operations and solid stock price performance. Although the company may harbor some minor weaknesses, we feel they are unlikely to have a significant impact on results. You can view the full Weight Watchers International 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.