NEW YORK ( TheStreet) -- Shares of Willbros Group (NYSE: WG) were gapping down Tuesday morning with an open price 16.1% lower than Monday's closing price. The stock closed at $10.85 Monday and opened today's trading at $9.10. The average volume for Willbros Group has been 531,900 shares per day over the past 30 days. Willbros Group has a market cap of $513.2 million and is part of the basic materials sector and energy industry. Shares are up 10.5% year to date as of the close of trading on Monday. Willbros Group, Inc. provides engineering, procurement, and construction services to the oil and gas, refinery, petrochemical, and power industries primarily in the United States, Canada, and Oman. It operates through two segments: Upstream Oil and Gas, and Downstream Oil and Gas. The company has a P/E ratio of 19.5, below the average energy industry P/E ratio of 29 and above the S&P 500 P/E ratio of 16.1. TheStreet Ratings rates Willbros Group as hold. The company's strengths can be seen in multiple areas, such as its revenue growth, compelling growth in net income and attractive valuation levels. However, as a counter to these strengths, we also find weaknesses including weak operating cash flow, a generally disappointing performance in the stock itself and poor profit margins. You can view the full Willbros Group 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.