Morgan Staley reports that Warren Buffett's Berkshire Hathaway equity portfolio value increased about 15 in the second quarter.br According to Business Insider that could be in part due to the company's new stake in Barrick Gold.br Analysts led by Michael Phillips said the company's new position is "potentially signaling caution given the uncertain macro environment."br In addition, "the company has largely reinvested the proceeds from equity sales in Treasury bills, reflecting caution in the current environment," said Phillips.