International Marine Underwriters (IMU) offers a full range of ocean marine insurance products.

Secure insurance for personal watercraft (powerboats & sailboats) through National Marine Underwriters (NMU).

A.W.G. Dewar's tuition refund plan protects schools and parents from the financial consequences of a student's withdrawal or dismissal from school.

OneBeacon Accident and Health focuses on analyzing and developing unique accident solutions and programs for transportation, specialty health and the sharing economy. The group creates and distributes niche accident and health and property-casualty products through brokers to motor carriers, employers, managed care organizations, associations, organizations and other affinity groups.

OneBeacon Financial Services offers property and casualty coverages for commercial banks, savings banks and savings and loan institutions, security broker-dealers, investment advisors, insurance companies and credit unions.

OneBeacon Inland Marine offers a robust suite of inland marine and related property products, including builders risk, contractors equipment, motor truck cargo, fine arts, camera equipment, musical instruments, DIC, scientific/medical equipment, equipment dealers and many more.


OneBeacon Environmental specializes in environmental risk solutions designed to address a variety of exposures for a broad range of businesses, including multiline casualty placements for the environmental industry.

OneBeacon Entertainment provides specialized commercial insurance products, including professional liability coverages, for the entertainment, sports and leisure industries.

OneBeacon Technology Insurance solely focuses on the technology industry, making it a source for technology insurance and risk management needs.


OneBeacon Surety Group offers a broad range of commercial, custom and miscellaneous bonds targeting middle-market, Fortune 2500 companies.

OneBeacon Specialty Property provides excess property and inland marine solutions that augment primary policies or self-insured retentions.

OneBeacon Management Liability offers D&O, EPL, fiduciary liability and crime insurance for nonprofits and private for-profit companies.

OneBeacon Financial Institutions specializes in professional liability, management liability and fidelity coverages for a broad range of financial institutions.

OneBeacon Government Risks provides solutions for midsized municipalities and counties, special districts and other publicly funded agencies.

OneBeacon Healthcare Group provides professional liability coverages and other specialized coverages for physicians and physician groups; free-standing medical facilities and providers; and managed care organizations.