Berkshire Hathaway's Oracle investment was notable because Buffett had historically tended to be cautious about investing in technology stocks. : The Oracle of Omaha is apparently through with the Oracle of Silicon Valley. And he also looks to be less bullish on Apple. Warren Buffett’s Berkshire Hathaway said in a quarterly filing with the Securities and Exchange Commission Thursday that his company sold off $2.1 billion worth of Oracle stock during the fourth quarter of 2018. Only three months earlier, Berkshire first reported owning 41.4 million shares in the enterprise-software giant.