Chief Executive Officer Paul Zwillenberg said Daily Mail and General Trust (DMGT) had built up RMS by investing in its software and data analytics, creating substantial shareholder value.
"We have decided that now is the right time to monetise our investment in RMS at a premium valuation," he said.
Moody's said RMS would immediately increase its insurance data and analytics business to nearly $500 million in revenue and would accelerate the development of its global integrated risk capabilities. RMS is expected to generate revenue of about $320 million for the fiscal year ending Sept. 30, Moody's said.
RMS, which has more than 400 risk models covering 120 countries, provides climate and natural disaster risk modeling serving the global property and casualty (P&C) insurance and reinsurance industries.
DMGT said last month it was in talks to sell RMS at the same time as it announced an 810-million-pound plan by its founding family and leading investor, the Rothermeres, to buy the group outright.
The plan was contingent on the sale of RMS, the completion of the listing of online car seller Cazoo, which DMGT partially owns, and an agreement with the company's pensions trustees.
The RMS disposal follows the sale in recent years of Hobsons, Genscape and Zoopla, collectively realising around 1.2 billion pounds of value, and leaving a group focused on consumer media, events and exhibitions and property tech.
DMGT said it still intended to distribute the proceeds of the RMS sale, along with its cash and its stake in a listed Cazoo via a special dividend of about 610 pence.
Shares in DMGT were trading up 1.8% at 1,088 pence in afternoon deals.
($1 = 0.7178 pounds)
(Reporting by Paul Sandle; editing by Sarah Young and Emelia Sithole-Matarise)