Berkshire's stake in the Tesla rival dates back to 2008, when it wrote in its annual report it owned a 10% stake in an "amazing Chinese company" named BYD, which was building the vehicle of "the future ... a new plug-in electric car." But according to a 10-Q form for Berkshire's energy arm filed for the period ending June 30, 2025, the Buffett-led company has reduced its stake to zero.