Warren Buffett's Berkshire Hathaway has purchased a $3.45bn stake in oil company Exxon Mobil.
Billionaire investor Warren Buffett has cut his stake in Tesco, days after the food retailer posted a major profit slump.
There was really only one story grabbing the headlines in the retail financial services world this week - the surprise exit of the most famous investor in the UK, Invesco Perpetual's Neil Woodford.
Billionaire investor Warren Buffett has compared the Federal Reserve to a giant - and successful - hedge fund, after the central bank opted not to taper its asset purchase programme on Wednesday evening.
Warren Buffett's company Berkshire Hathaway has reported a rise in profits of 46% in the second quarter following big gains from the firm's investment portfolios.