On May 1, Buffett and long-time business partner Charlie Munger will hold Berkshire Hathaway's annual shareholder meeting in Los Angeles. This may serve as a forum for the pair to discuss additional investments purchased and sold in the first months of 2021, ahead of formal 13-F filing reveals later in the month. Last year, Buffett disclosed at the annual meeting that Berkshire had sold out of its entire interest in the airline stocks American Airlines ( AAL ), United Airlines ( UAL ), Delta Air Lines ( DAL ) and Southwest Airlines ( LUV) in the first quarter of 2020.