The Cincinnati Insurance Company offers our local, independent agents market access to excess and surplus lines products through its nonadmitted and wholly owned subsidiary, The Cincinnati Specialty Underwriters Insurance Company. CSU carries an AM Best rating of A+ (Superior). A Delaware domiciled carrier, CSU operates in the same footprint as Cincinnati Insurance, covering 43 active states and is an approved nonadmitted carrier in all 50 states and Washington, D.C.Cincinnati agents access CSU through our in-house E&S brokerage – CSU Producer Resources Inc. C-SUPR is a wholly owned subsidiary of Cincinnati Financial Corporation.