Berkshire Hathaway CEO Warren Buffett is one of history's most successful investors, and his expertise when it comes to identifying fantastic long-term opportunities has delivered incredible returns for his company's shareholders. Notably, Buffett has been famously averse to investing in the tech sector for most of his tenure as Berkshire's leader -- but that's changed a lot in recent years. At the peak, Berkshire held 915 million shares of Apple stock -- and its investment in the tech giant sometimes accou ...