NEW YORK ( TheStreet) -- GNC Acquisition Holdings (NYSE: GNC) is trading at unusually high volume Friday with 7.5 million shares changing hands. It is currently at 4.1 times its average daily volume and trading down $1.08 (-3%) at $35.42 as of 4 p.m. ET. GNC Acquisition has a market cap of $3.9 billion and is part of the services sector and retail industry. Shares are up 29.1% year to date as of the close of trading on Thursday. GNC Holdings, Inc. operates as a specialty retailer of health and wellness products. Its products include vitamins, minerals, and herbal supplement products, as well as sports nutrition and diet products. The company has a P/E ratio of 20.7, below the average retail industry P/E ratio of 21.2 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates GNC Acquisition as a hold. The company's strengths can be seen in multiple areas, such as its solid stock price performance, notable return on equity and robust revenue growth. However, as a counter to these strengths, we find that the company has not been very careful in the management of its balance sheet. You can view the full GNC Acquisition Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.