Warren Buffett 's Berkshire Hathaway Inc. BRKA BRKB has reportedly trimmed its stake in China's BYD Manufacturing Company Limited BYDDY BYDDF further. What Happened: Berkshire sold about 3.23 million Hong Kong-listed shares of BYD for HK $630.33 million ($80.7 million), Reuters reported, citing a filing with the Hong Kong stock exchange on Tuesday. Buffett's investment firm has been on a BYD share-selling spree in recent months.