Much of the comment surrounding the second-quarter update centred on the group's shrinking stake in tech giant Apple (US:APPL), a company recently described by Buffett as "an even better business" than both Coca-Cola (US:KO) and American Express (US:AXP). Together with Chevron (US:CVX) and Bank of America (US:BAC), these stocks account for 72 per cent of the aggregate fair value of Berkshire Hathaway's public equity holdings. Yet Apple's share of the total allocation to public stocks has declined rom around 50 per cent at the end of last year to 30 per cent.