NEW YORK ( TheStreet) -- Select Medical Holdings Corporation (NYSE: SEM) is trading at unusually high volume Thursday with 2.3 million shares changing hands. It is currently at 6.6 times its average daily volume and trading down 20 cents (-2.5%) at $7.97 as of 1:15 p.m. ET. Select Medical has a market cap of $1.29 billion and is part of the health care sector and health services industry. Shares are down 3.7% year to date as of the close of trading on Wednesday. Select Medical Holdings Corporation, through its subsidiary, Select Medical Corporation, operates specialty hospitals and outpatient rehabilitation clinics in the United States. The company has a P/E ratio of 13.7, below the average health services industry P/E ratio of 14.5 and below the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Select Medical as a hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth, solid stock price performance and increase in net income. However, as a counter to these strengths, we find that the company's profit margins have been poor overall. You can view the full Select Medical 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 falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.