Frankfurt am Main, November 20, 2015 -- Moody's Investors Service, ("Moody's") has today downgraded the long term issuer rating of Sigma-Aldrich Corporation (SIAL) to Baa1 from A2. Concurrently Moody's has also downgraded SIAL's Commercial Paper rating to P-2 from P-1 and the instrument rating on USD300 million of senior unsecured notes due 2020 to Baa1 from A2. The outlook on all ratings is negative. Today's rating action concludes the review for downgrade process initiated on 23rd September 2014.

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