Hong Kong-listed shares of BYD tumbled on Wednesday after Warren Buffett’s Berkshire Hathaway trimmed its stake in the Chinese electric car maker — and one fund manager said this could be a warning sign of more to come.

The conglomerate slightly reduced its shares from 20.04% to 19.92%, according to a filing on the Hong Kong exchange. Berkshire sold 1.33 million shares of BYD for about $47 million — the conglomerate now owns 218.7 million shares, the filing showed.

“This is a common trend for investors starting to take cash from the market,” Yang Liu, Atlantis Investment’s chairperson and chief investment officer, told CNBC’s “Street Signs Asia” on Wednesday.

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