the logo of chinas byd is seen on an electric bus as part of the new fleet of electric buses for public transport in santiago chile november 28 2018 picture taken november 28 2018 reutersrodrigo garrido july 12 reuters  hong kong shares of byd co ltd 1211hk recorded their worst day in 20 months on tuesday after citibanks increased holding of the chinese ev firms stock sparked market chatter that warren buffetts berkshire hathaway may have cut its stake citibanks shareholding in byd has increased by 225 million shares to 38861 million shares on july 11 from 1634 million shares on july 8 disclosures from hkexs central clearing and settlement system regarding market intermediaries showed top holder berkshire hathaway brkan owned 225 million shares or about 205 of byd at the end of 2021 according to refinitiv data the size is a good match with warren buffetts stake in byd a director at a regional brokerage said adding it fuels speculation buffett might have cut his stake with the shares sitting in the custodian bank berkshire did not immediately respond to a request for comment and citibank declined to comment reuters could not independently verify speculation around buffetts change in stake big investors have to disclose major changes to their shareholding and so far there is no information on that byd said in response to a reuters request for comment on wechat byd shares dropped nearly 12 to hk27020 the company overtook tesla inc in global electric vehicle sales in first half of 2021 according to a media report last week reporting by medha singh in bengaluru and jonathan stempel in new york editing by anil dsilva