 The Insurance Services Office (ISO) is "a leading supplier of statistical, underwriting and actuarial information for the property/casualty insurance industry", and its rating is used to measure the quality and effectiveness of fire protection in a community.At the time, Richardson was one of only 56 municipalities in the country to achieve this highest rating, which tends to reduce property/casualty insurance premiums.Metro by T-Mobile, Fossil, Lennox International, Vent-A-Hood, Wingstop Restaurants, id Software, VCE, BlueCross BlueShield of Texas, RealPage, Fujitsu Network Communications (U.S. Headquarters) and Samsung Mobile have their corporate headquarters in Richardson.