Superior Underwriters

superior underwriters and gsu insurance services are divisions of groninger & co., inc. established in 1928, we operate as a locally-owned independent general agency with our home office located in bellevue, washington. we specialize in hard-to-place, specialty, and surplus lines business and market our products to independent agents throughout the united states including; alaska, california, colorado, idaho, montana, nevada, oregon, utah, washington, and wyoming. we offer various programs for admitted and non-admitted business, and have 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. with over 100 years of collective underwriting experience, our staff works closely with our carriers to provide well-designed products and coverages for our retail partners.