Warren Buffett, chief executive of Berkshire Hathaway, has increased his exposure to four 'excellent' US blue-chip stocks, including American Express and IBM.
In his annual letter to shareholders, Buffett (pictured) said he had increased exposure to his 'Big Four' investments; American Express, Coca-Cola, IBM and Wells Fargo. IBM and Wells Fargo were increased...
He left the IA in October
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