Superior Underwriters | GSU Insurance Services
InsuranceWashington, United States11-50 Employees
Superior Underwriters and GSU Insurance Services operate as divisions of Groninger & Co., Inc., a long-established insurance organization. Established in 1928, the firm is based in Bellevue, Washington, and functions as a locally owned independent General Agency. It focuses on hard-to-place, specialty, and surplus lines and markets its products through Independent Agents across the United States, including Alaska, California, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, and Wyoming. It maintains programs for both admitted and non-admitted business and has binding authority to write Commercial Property & Casualty, Garage Liability, Personal Lines, and Transportation coverages, including various trucking operations. With more than a century of underwriting experience collectively, its staff collaborates with carriers to design products and coverages for its retail partners. Recent development: In January 2025, AmWINS Group, Inc. announced the acquisition of Superior Underwriters.
1-888-653-2347 
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