General Agent & Surplus Lines Broker

Company Bio

Superior Underwriters and GSU Insurance Services are divisions of Groninger & Co., Inc.

We are a locally owned independent General Agency located in Bellevue, Washington, specializing in tough to place, specialty and surplus lines business in 10 western states.  Our offices are located in in Washington and Utah, where we offer various exclusive programs providing admitted and non-admitted business.  Our company has binding authority to write the following lines: Commercial Property & Casualty, Garage Liability, Personal Lines, and Transportation including business, public, local, intermediate, and long haul trucking.

Our combination of competitive rates and great markets makes us unique.  Our service is what makes us truly “Superior.”  We would like the opportunity to earn your business!


states serviced

Providing Superior Service Since 1928 Superior Underwriters  -  GSU Insurance Services  -  Groninger & Co., Inc.  -  CA License #0745051
800-782-8699 (WA Office) 866-366-1644 (UT Office)
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