BYDDF vs BYDDY: Understanding the OTC Stock Ticker Difference. Investors fretted as BYD stock plummeted 30%. CEO proposes share buyback to ease concerns. Charlie Munger sheds light on Buffett's BYD sale. BYD's price tag may be steep, but its lead over Tesla is undisputed. Frost Sullivan assures BYD's earnings aren't just a fleeting blip.