Buffett's company began investing in Shenzhen-based BYD in 2008, when it paid $230 million for about 225 million shares, equivalent to a 10% stake at the time.
It began selling those shares in 2022 after BYD's share price had risen more than twentyfold.
Berkshire did not immediately respond to a request for comment on Monday. CNBC first reported Berkshire exiting its stake on Sunday.