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Warren Buffett doubled his stake in Apple in January

Berkshire Hathaway now owns 2.5 percent of Apple.

Fortune's Most Powerful Women Summit - Day 2 Paul Morigi/Getty Images for Fortune/Time Inc

A year ago, Warren Buffett didn’t have a single share in Apple. Now the billionaire owns 2.5 percent of the company.

The Berkshire Hathaway CEO said he went on a buying spree in January and now owns 133 million shares in Apple, worth about $17 billion. That’s more than double what he owned at the end of 2016, and up from zero at the beginning of 2016.

Buffett famously insists that he’s not a technology investor, but says he bought Apple anyway, “because I liked it.”

“There’s a vast, untapped market up there,” Buffett said on CNBC, where he disclosed the new purchase and showed off his existing phone — not an iPhone, but a vintage flip model.

When Berkshire first announced that it had bought Apple shares in May 2016, the stock climbed 3.7 percent. It’s up less than 1 percent this morning in pre-market trading.

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