Buffett tops up 'excellent' US blue chips on Berkshire Hathaway

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 via purchasing additional shares; The weighting in IBM increased from 7.8% at the end of 2014 to 8.4%, while Wells Fargo is up from 9.4% to 9.8%. Exposure to Coca-Cola and American Express was increased via stock repurchases, with Coca-Cola increasing from 9.2% to 9.3%, and American Express from 14.8% to 15.6%. Buffett said: "In case you think these seemingly small changes are n...