Partner Companies

ISU MainStreet® has continued to meet various insurance needs of businesses, institutions, individuals and families throughout the United States. We are dedicated to providing a diversified portfolio of top-rated, financially sound insurance carriers that offer you the most competitive rates available within the industry. As a member of ISU Insurance Services, we are dedicated to consistently delivering the best value for your premium dollar. ISU is the 2nd largest privately held Commercial Insurance Broker in the United States with over 190 offices and 2200 professionals from coast to coast. The ISU Value Search™ accesses over 300 insurance companies to assure you receive the best combination of price, product and service. More than 100,000 businesses and 5,000,000 families and individuals know from personal experience that Our Knowledge is your Best Insurance™.


~Carrier Portfolio~

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  • ACE
  • AFLAC
  • AIG
  • Allied
  • Allstate
  • American Modern Ins.
  • American Wholesale Underwriting
  • AmTrust
  • Applied
  • Arrowhead
  • Atlas
  • Berkeley Ins. Co.
  • Berkshire Hathaway
  • Bliss & Glennon
  • Burns & Wilcox
  • Chartis
  • Chubb
  • CNA
  • CNA Surety
  • Crum & Forster
  • Core Programs
  • CSE
  • Dongbu
  • Employers Ins. Group
  • Everest
  • Financial Pacific
  • First American
  • Foremost
  • Grange Ins.
  • Great American
  • Guard
  • Hagerty
  • Hanover
  • Hartford
  • Hartford Steam Boiler
  • ICW
  • Kemper
  • Lexington Ins.
  • Liberty Mutual
  • LIG
  • Main Street Group
  • Markel
  • Mercury Insurance
  • Metlife Home & Auto
  • National General
  • Oregon Mutual
  • OneBeacon
  • Philadelphia Ins. Co.
  • Preferred Employers Ins. Co.
  • Progressive
  • R.T. Specialty
  • Republic Indemnity
  • REU
  • Safeco
  • Safehold
  • Seneca Ins. Group
  • State Auto
  • Travelers
  • West Bend Mutual
  • WR Berkely
  • Zenith Ins. Co.
  • Zurich Ins. Co.