FILE - The children of Berkshire Hathaway Chairman and CEO Warren Buffett, from left, Howard Buffett, Susie Buffett, and Peter Buffett, pose for a photo at the CenturyLink Center exhibit hall in Omaha, Neb., May 1, 2015. (AP Photo/Nati Harnik, File)

FILE - Warren Buffett, Chairman and CEO of Berkshire Hathaway, speaks during a game of bridge after the annual Berkshire Hathaway shareholders meeting in Omaha, Neb., on May 5, 2019. (AP Photo/Nati Harnik, File)