ValueAct Capital Master Fund, L.P.

March 31, 2010 19:53 ET

ValueAct Capital Master Fund, L.P.: Press Release

TORONTO, ONTARIO--(Marketwire - March 31, 2010) - ValueAct Capital Master Fund, L.P. ("ValueAct Capital") announced today that, after giving effect to the results of the substantial issuer bid ("SIB") of MDS, Inc. (the "Company") and reflecting recent open market transactions on the New York Stock Exchange and the Toronto Stock Exchange, it expects to hold 9,235,700 common shares, representing approximately 13.7% of the total outstanding common shares, of the Company. ValueAct Capital may pursue further dispositions in the future. The above amounts are calculated assuming the number of common shares issued and outstanding will be approximately 67.2 million and that the Company will purchase 99.7% of the common shares deposited at $8.50 or less, as indicated in the Company's press release.

A report containing additional information in respect to the foregoing may be obtained by calling Dorothea Kennedy at (415) 249-1211.

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