The Cincinnati Specialty Underwriters Insurance Company
InsuranceOhio, United States51-200 Employees
The Cincinnati Specialty Underwriters Insurance Company (CSU) is a Delaware-domiciled, nonadmitted carrier that serves as the wholly owned subsidiary through which The Cincinnati Insurance Company provides local independent agents access to excess and surplus lines. Market access is facilitated through CSU Producer Resources Inc. (C-SUPR), the in-house E&S brokerage. The company is based in Hamilton, Ohio, and is part of the Cincinnati Insurance footprint. CSU operates across 43 active states and is an approved nonadmitted carrier in all 50 states and Washington, D.C. It holds an A+ (Superior) rating from AM Best, reflecting its underwriting strength. The arrangement places CSU within the Cincinnati Financial Corporation family, focusing on specialty underwriting for independent agents in the excess and surplus lines space.