It's never ideal to hear that the world's most famous investor sold his stake of a company, but should investors follow?

BYD Company , a Chinese electric vehicle (EV) juggernaut, quickly took over its home market before stepping out into the world. And then it started taking over global sales, too, signaling not only had it arrived as a global powerhouse but that it was here to stay.

BYD's stock has been a high flyer over the years, but arguably its most well-known investor just exited his stake in the company -- is it a red flag for investors?

What's going on?

Warren Buf f ett 's Berkshire Hathaway has fully exited its position in BYD, per an SEC filing, which ends a lengthy 17-year investment that boasted a staggering increase in value over that time frame.

Berkshire Hathawa

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