NEW YORK ( TheStreet) -- Shares of Sunoco (NYSE: SUN) were gapping down Wednesday morning with an open price 15.6% lower than Tuesday's closing price. The stock closed at $42.31 Tuesday and opened today's trading at $35.73. The average volume for Sunoco has been 2.2 million shares per day over the past 30 days. Sunoco has a market cap of $4.5 billion and is part of the basic materials sector and energy industry. Shares are down 3.7% year to date as of the close of trading on Tuesday. Sunoco, Inc., through its subsidiaries, refines and markets petroleum products, and manufactures chemicals in the United States. It operates in five segments: Refining and Supply, Retail Marketing, Logistics, Chemicals, and Coke. TheStreet Ratings rates Sunoco as a hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth and solid stock price performance. However, as a counter to these strengths, we also find weaknesses including deteriorating net income, generally poor debt management and disappointing return on equity. You can view the full Sunoco Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping down? Get free SMS text alerts sent to you when the action happens by texting DOWN to 95370 or select from multiple alert options.