Chinese electric vehicle giant BYD has confirmed that Warren Buffett’s Berkshire Hathaway sold off its remaining stake in the company earlier this year, calling the move a routine part of investing.

In a statement on Weibo, BYD’s PR executive Li Yunfei thanked Buffett and the late Charlie Munger for their long-term support, while noting that buying and selling is simply what investors do. BYD’s Executive Vice President Stella Li reiterated the message in an interview with CNBC, saying Buffett and Munger “loved BYD and its management” but emphasized that portfolio shifts are natural for Berkshire.

Meanwhile, Alfredo Altavilla, a special adviser to BYD, told Reuters that Buffett’s investment returned an estimated 20 times the original capital: “He did very well to do what he did.”

Despite the calm tone from BYD, markets reacted sharply. The company’s shares in Hong Kong dropped more than 6% this week, as global investors digested the news of Berkshire’s full exit.

BYD stressed that Buffett’s departure does not signal a lack of confidence in its future: “We’ve been extremely glad to have had Buffett as an investor, but monetizing positions is what Berkshire does for a living.”