Platinum Underwriters Holdings, Ltd. Announces An Increase In Its Share Repurchase Program And Declares A Quarterly Dividend On Its Common Shares

Platinum Underwriters Holdings, Ltd.

announced today that it has increased the authorized amount under its existing share repurchase program to a total of up to $250.0 million of its common shares. Repurchases under the program may be made in open market or privately negotiated transactions or otherwise, from time to time, depending on market conditions. The Company also announced today that the Board of Directors has declared a quarterly dividend of $0.08 per common share. The dividend is payable on September 30, 2013 to shareholders of record on September 3, 2013. About Platinum Platinum Underwriters Holdings, Ltd.

is a leading provider of property, casualty and finite risk reinsurance coverages, through reinsurance intermediaries, to a diverse clientele on a worldwide basis. Platinum operates through its principal subsidiaries in Bermuda and the United States. For further information, please visit Platinum's website at www.platinumre.com.