ISO was formed in 1971 as an advisory and rating organization for the property/casualty insurance industry to provide statistical and actuarial services, to develop insurance programs, and to assist insurance companies in meeting state regulatory requirements. It became a wholly owned subsidiary of Verisk Analytics in October 2009.
ISO provides a number of risk-related services to its clients:
ISO's databases contain more than 19 billion detailed records relating to insurance and risk management, which form the basis for its information services, with two billion records collected each year. ISO employs many members of the Casualty Actuarial Society and other insurance professionals to develop its risk-related products and services.
↑Verisk Analytics Form 10-Q filed July 29, 2014[dead link], Verisk Analytics. Accessed September 1, 2015. "Verisk was established to serve as the parent holding company of Insurance Services Office, Inc. (“ISO”) upon completion of the initial public offering ("IPO"), which occurred on October 9, 2009. ISO was formed in 1971 as an advisory and rating organization for the P&C insurance industry to provide statistical and actuarial services, to develop insurance programs and to assist insurance companies in meeting state regulatory requirements. For over the past decade, the Company has broadened its data assets, entered new markets, placed a greater emphasis on analytics, and pursued strategic acquisitions."
↑2013 Verisk Analytics Annual Report, Verisk Analytics. Accessed September 1, 2015. "On May 23, 2008, in contemplation of our initial public offering, or IPO, ISO formed Verisk Analytics, Inc., or Verisk, a Delaware corporation, to be the holding company for our business. Verisk was initially formed as a wholly-owned subsidiary of ISO. On October 6, 2009, in connection with our IPO, the Company effected a reorganization whereby ISO became a wholly-owned subsidiary of Verisk."
↑Amy Ebenstein. (5 May 2026). "Verisk Brings Its Trusted Analytics and Generative AI Capabilities Directly into Anthropic’s Claude." Verisk website Accessed 7 May 2026.
↑Information from the ISO DatabaseArchived 2016-03-04 at the Wayback Machine, Verisk Analytics. Accessed September 1, 2015. "ISO maintains one of the largest private databases in the world. Each year, we collect some 2 billion detailed records of insurance premiums collected and losses paid."