Sigma Underwriting Managers

Servicing Carriers and Brokers

Location Overview

Sigma Underwriting Managers (SUM) is the nationwide wind catastrophe property insurance specialist for commercial and habitational properties, with over 100 years of combined underwriting experience. Sigma offers the following advantages: Knowledge and Authority - we are a Zurich Program Administrator and London Correspondents, not a wholesale broker; London Correspondents Comprehensive coverage - wide range of deductibles and nationwide eligibility; Exceptional Servie; CAT modeling software and a state-of-the-art electronic policy issuance - underwritten by a member company of Zurich, an A.M. Best "A+" XV rated carrier; and policies underwritten through our London contracts are A.M. Best rated "A" Excellent and Standard & Poor's Rated "A+". Sigma Underwriting Managers are Program Administrators for Zurich and London correspondents, not an Excess & Surplus (E&S) broker. We only underwrite for our carrier partners, we do not broker accounts. Working with Sigma is like working directly with the carrier. We offer a competitive commission and a high level of service to our clients.

Service Area


Products & Services


  • Underwriting


  • Property