Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model. NEW YORK ( TheStreet) -- The ex-dividend date for National Oilwell Varco (NYSE: NOV) is tomorrow, March 13, 2013. Owners of shares as of market close today will be eligible for a dividend of 13 cents per share. At a price of $67.52 as of 9:31 a.m. ET, the dividend yield is 0.8%. The average volume for National Oilwell Varco has been 4.2 million shares per day over the past 30 days. National Oilwell Varco has a market cap of $29.09 billion and is part of the basic materials sector and energy industry. Shares are down 1% year to date as of the close of trading on Monday. National Oilwell Varco, Inc. provides equipment and components for oil and gas drilling and production; oilfield services; and supply chain integration services to the upstream oil and gas industry worldwide. The company has a P/E ratio of 11.7, below the S&P 500 P/E ratio of 17.7.