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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 Sigma-Aldrich Corporation (Nasdaq: SIAL) is tomorrow, May 29, 2013. Owners of shares as of market close today will be eligible for a dividend of 22 cents per share. At a price of $85.55 as of 9:30 a.m. ET, the dividend yield is 1%. The average volume for Sigma-Aldrich has been 675,300 shares per day over the past 30 days. Sigma-Aldrich has a market cap of $10.18 billion and is part of the basic materials sector and chemicals industry. Shares are up 15% year to date as of the close of trading on Friday. Sigma-Aldrich Corporation, a life science and high technology company, develops, manufactures, purchases, and distributes various chemicals, biochemicals, and equipment worldwide. The company has a P/E ratio of 22.1, above the S&P 500 P/E ratio of 17.7.