White Mountains, a diversified insurance and related financial services holding company, agreed to acquire a 72% stake in Ark Insurance, a provider of insurance products and services, for $800m. White Mountains expects the transaction to close in January 2021. "We are delighted to have found the right capital partner in White Mountains, an institution with a long track record of successful insurance partnerships. We look forward to a fruitful relationship," Ian Beaton, Ark CEO.