NEW YORK ( TheStreet ) -- The ex-dividend date for Imperial Oil (AMEX: IMO ) is Tuesday, May 31, 2011. Owners of shares as of market close today will be eligible for a dividend of 11 cents per share. At a price of $49.37 as of 9:32 a.m. ET, the dividend yield is 1%. The average volume for Imperial Oil has been 448,300 shares per day over the past 30 days. Imperial Oil has a market cap of $40.8 billion and is part of the basic materials sector and energy industry. Shares are up 20.8% year to date as of the close of trading on Thursday. Imperial Oil Ltd. engages in the exploration, production, and sale of crude oil and natural gas in Canada. The company operates through three segments: Upstream, Downstream, and Chemical. The company has a P/E ratio of 15.9, below the average energy industry P/E ratio of 16.2 and below the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Imperial Oil as a buy.