Warren Buffett’s Berkshire Hathaway lost its triple-A grade from Moody’s Investors Service, the very ratings firm in which the billionaire holds a 20 per cent stake. The two-notch downgrade to Aa2, which follows Fitch Ratings’ one-notch cut last month, comes as Berkshire seeks to rebound from its worst year since the “Sage of Omaha” took control of the former textiles maker in 1965.
