Intact Insurance Specialty Solutions

On June 1, 2001, White Mountains Insurance Group, Ltd. acquired CGU's U.S. operations, and the company was renamed OneBeacon Insurance Group after the company's former "hometown" address of 1 Beacon Street in Boston.[1]

CGU had its roots in a merger between Commercial Union and General Accident Insurance.

In 2001, the company had two specialty businesses—International Marine Underwriters and A.W.G. Dewar, ocean marine and tuition refund specialists, respectively. OneBeacon began forming additional specialty segments, starting with OneBeacon Professional Insurance (OBPI) in 2002. In 2006, the company held its initial public offering (IPO), and began a full-specialization approach, starting new segments through teams of people or business acquisitions. Between 2009 and 2010, the company sold its non-specialty commercial lines renewal rights and personal lines.

On September 28, 2017, (former) OneBeacon Insurance Group, Ltd. was acquired by Intact Financial Corporation. The merger created a leading specialty insurer in North America, combining Intact's leading commercial lines track record, deep data, claims and digital expertise with OneBeacon's outstanding team and specialty lines capabilities.[2]

On October 14, 2020, Intact Financial Corporation officially brought together its Canadian and U.S. specialty capabilities under a single brand: Intact Insurance Specialty Solutions. The U.S. businesses had formerly operated under the OneBeacon Insurance Group and The Guarantee Company of North America brands in the U.S., following the 2017 and 2019 acquisitions of these specialty companies, respectively.