White Mountains Subsidiary Provides Real-Time Pricing and Highly-Rated Risk Capacity for Corporations Using Storm Exchange’s Online Platform

Storm Exchange, Inc., a leading financial technology company that helps corporations maximize shareholder value by reducing the financial impact of unplanned weather on earnings, today announced it has reached an agreement with Galileo Weather Risk Management Ltd., (“Galileo”), a subsidiary of White Mountains Insurance Group, Ltd. [NYSE: WTM] (“White Mountains”). Galileo, which offers tailored financial weather risk management products to corporations and municipalities, will provide capacity and real-time pricing for contracts initiated through Storm Exchange online electronic weather exchange.

“Our relationship with Storm Exchange is an opportunity to diversify our product offerings to include new risks, originating from the agriculture, construction, aviation and entertainment industries,” said Martin Malinow of Galileo. “We’re confident in Storm Exchange’s ability to bring end-users from these industries to the weather market through its innovative technology platform and to meaningfully increase the size of the market.”

Contract limits are anticipated to be sized up to $10 million, but Galileo has the flexibility to enter into contracts with limits up to $50 million and beyond.

“Having capacity provided by Galileo is critical to offering our clients effective solutions backed by the credit of a strong financial partner,” noted David Riker, President & CEO of Storm Exchange.

“Galileo is a leader in the weather risk management market, and it’s owned by White Mountains, one of the most respected names in the insurance and financial services industries.”

Storm Exchange represents the first opportunity for corporations in industries such as agriculture, energy, travel, retail and construction to benchmark and track the financial impact of weather on earnings, assess management alternatives, and purchase derivatives contracts to hedge weather risk. The company’s indices give clients a standardized means to assess the cost or benefit of deviations in seasonal temperature, precipitation and wind for their industry, categorized by time of year and geography.

About Galileo Weather Risk Management,

Galileo provides tailored financial weather risk management products to corporations and municipalities, primarily energy companies, utilities, and construction companies, seeking to mitigate their financial exposure to variations in weather conditions.

About White Mountains

White Mountains is a Bermuda-domiciled financial services holding company traded on the New York Stock Exchange and the Bermuda Stock Exchange under the symbol WTM with primary business interests in property and casualty insurance and reinsurance companies.

About Storm Exchange

Storm Exchange, Inc. assists clients with maximizing shareholder value by providing solutions for removing the financial uncertainty of weather. Storm Exchange provides the data, analysis and access to financial risk transfer capacity that helps companies invest for growth rather than worrying about earnings fluctuating from potential weather-related costs. Storm Exchange facilitates the exchange of options indexed to recorded weather, such as temperature, precipitation and wind speed. To complement financial solutions, Storm Exchange publishes proprietary indices, benchmarking the impact of weather on future demand for goods and services, as well as the price and availability of commodity resources. Storm Exchange is backed by leading venture capital funds RRE Ventures and Venrock Associates, as well as other investors.

Storm Exchange has been working with companies in energy, mining, agriculture, manufacturing and skiing industries since September 2006. Visit Storm Exchange at www.stormexchange.com, and David Riker’s blog at www.theweatheroption.com.