General Agent & Surplus Lines Broker

Our History

Superior Underwriters and GSU Insurance Services are divisions of Groninger & Co., Inc.  We operate as a locally and independently owned General Agent and Surplus Lines Broker of Property and Casualty insurance.  We market our products through Independent Agents throughout the intermountain and western United States.

Robert R. Groninger started Groninger & Co., Inc. in 1928 based in Seattle, Washington.   At that time, the company wrote standard lines of business in the Pacific Northwest and Alaska.

In 1967, the company purchased Superior Underwriters.  This purchase brought into existence an entirely separate division of Groninger & Co., Inc.  The Superior Underwriters division specialized in writing insurance for non-standard and specialty risks.

Since 1976, we have made a commitment to continued growth.  We purchased two General Agencies, one in 1993 and another in 2000.  In 2003, we expanded to the Mountain States by opening GSU Insurance Services in Utah.  Due to this expansion, we now operate in 10 western states (AK, CA, CO, ID, MT, NV, OR, UT, WA & WY).


We look forward to working with you!