NEW YORK ( TheStreet) -- Susser Holdings Corporation (Nasdaq: SUSS) is trading at unusually high volume Friday with 968,491 shares changing hands. It is currently at 9.1 times its average daily volume and trading down 46 cents (-2.1%) at $21.32 as of 11:35 a.m. ET. Susser has a market cap of $391.1 million and is part of the services sector and retail industry. Shares are up 57.3% year to date as of the close of trading on Thursday. Susser Holdings Corporation, together with its subsidiaries, operates convenience stores and distributes motor fuels in Texas, New Mexico, Oklahoma, and Louisiana. The company operates through two segments, Retail and Wholesale. TheStreet Ratings rates Susser as a hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth, solid stock price performance and compelling growth in net income. However, as a counter to these strengths, we also find weaknesses including generally poor debt management, poor profit margins and weak operating cash flow. You can view the full Susser 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.