OneBeacon Insurance Group shines its light on several insurance options for its customers across the US. OneBeacon provides specialty property/casualty insurance policies, including marine, travel, professional liability, medical malpractice, data privacy, umbrella property, and even tuition coverage for when a student is forced to leave school unexpectedly. Products are sold to businesses and individuals through a network of 2,500 independent agents and brokers across the US. Holding company White Mountains Insurance owns a controlling stake in OneBeacon.