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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) -- Sigma-Aldrich Corporation (Nasdaq: SIAL) hit a new 52-week high Thursday as it is currently trading at $76.77, above its previous 52-week high of $76.69 with 154,856 shares traded as of 12:21 p.m. ET. Average volume has been 517,600 shares over the past 30 days. Sigma-Aldrich has a market cap of $9.12 billion and is part of the basic materials sector and chemicals industry. Shares are up 3% year to date as of the close of trading on Wednesday. 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 20.5, above the S&P 500 P/E ratio of 17.7.