Billionaire Warren Buffett, marking 60 years leading Berkshire Hathaway, told shareholders in his annual letter released Saturday that he continues to prefer stocks despite a higher cash position.

The mystery over Warren Buffett’s surprisingly defensive stance deepened over the weekend. The 94-year-old CEO of Berkshire Hathaway sold more stocks in the latest quarter and grew a record cash pile even larger to $334 billion,

Warren Buffett is celebrating the successes of Berkshire Hathaway’s companies last year and in the 60 years since he took over a struggling New England textile company and began converting it into a massive conglomerate.