After ending 2022 with their worst full-year returns since the depths of the financial crisis, the Dow Jones Industrial Average, S&P 500, and Nasdaq Composite have come roaring out of the gate this year. With one day of trading left (at the time of this writing) in the first-half of 2023, the Dow, S&P 500, and Nasdaq Composite are respectively higher by 3%, 15%, and 30%. As we head into the second half of 2023, two unexpected stocks are being bought hand over fist by billionaire investors.