Yahoo Finance

ACE acquired Chubb in the first quarter of 2016 and assumed the Chubb name. The combination made the new Chubb one of the largest domestic property and casualty insurers, with operations in 54 countries spanning commercial and personal P&C insurance, reinsurance, and life insurance.

FactSet provides financial data and portfolio analytics to the global investment community. The company aggregates data from third-party data suppliers, news sources, exchanges, brokerages, and contributors into its workstations. In addition, it provides essential portfolio analytics that companies use to monitor portfolios and address reporting requirements. Buy-side clients account for 82% of FactSet's annual subscription value. In 2015, the company acquired Portware, a provider of trade execution software. In 2017, it acquired BISAM, a risk management and performance measurement provider. In 2022, it completed its purchase of CUSIP Global Services.

Moody’s, along with S&P Ratings, is a leading provider of credit ratings on fixed-income securities. The ratings segment, Moody’s Investors Service, includes corporates, structured finance, financial institutions, and public finance ratings. MIS represents a majority of the firm’s profit and about half the firm's revenue. The other segment, Moody’s Analytics, consists of decision solutions, research and insights, and data and information.

Berkshire Hathaway is a holding company with a wide array of subsidiaries engaged in diverse activities. The firm's core business segment is insurance, run primarily through Geico, Berkshire Hathaway Reinsurance Group, and Berkshire Hathaway Primary Group. Berkshire has used the excess cash thrown off from these and its other operations over the years to acquire Burlington Northern Santa Fe (railroad), Berkshire Hathaway Energy (utilities and energy distributors), and the companies that make up its manufacturing, service, and retailing operations (which include five of Berkshire's largest noninsurance pretax earnings generators: Precision Castparts, Lubrizol, Clayton Homes, Marmon, and IMC/ISCAR). The conglomerate is unique in that it is run on a completely decentralized basis.