Amazon.com shares boosted by Warren Buffett's comments

Shares in Amazon are up, a day after billionaire investor Warren Buffett told CNBC that his firm had been buying shares in the online retailer

Buffett told CNBC on Thursday that a money manager at Berkshire Hathaway has been buying shares in Amazon lately. On Friday, shares of Amazon jumped more than 3%.

"Yeah, I've been a fan, and I've been an idiot for not buying" Amazon shares, Buffett said on CNBC Thursday. "But I want you to know it's no personality changes taking place."

In 2017, Buffett told CNBC that "stupidity" was to blame for his not seeing Amazon's potential.

And at last year's Berkshire annual meeting, Buffett said that he has long admired Amazon CEO Jeff Bezos, but he blew the chance to invest in it early on when the stock was priced more reasonable. Buffett said then that he thought Amazon stock was likely too expensive for him to buy now at a value, but one of his investment managers at Berkshire decided differently this year.

While the famously technology-averse investor admits he made a mistake, he also made it clear that Berkshire's Amazon buy was not directed by him.

Details about the transactions are expected to be revealed in a future regulatory filing.

Shares in the Seattle-based Amazon.com Inc. rose to $1,960.91 in afternoon trading Friday, its high for the year. The stock is up 30% so far in 2019.