Speaking with CNBC's Becky Quick from Omaha, Neb., Buffett said that he lifted his stake from 59 million shares at the end of last year and that he likes the "incredible stickiness" of the tech giant's consumer products. His holding now puts around 2.5% of Apple's shares under his control. Apple is Berkshire Hathaway's second-largest holding.
"The degree to which people's lives center around the product his huge," Buffett said of the Apple iPhone, even as he revealed that he didn't have one himself.
"I won't make any predictions on market value," Buffett said when asked if the company could eventually could be worth $1 trillion. "What I do know is that when I take a dozen kids to Dairy Queen, which I do every Sunday, they're all on their iPhones. They love it."
Apple closed at $136.66 in New York on Friday after rising 0.1% on the session, giving the company a market value of $717.7 billion. The stock was up slightly in premarket trading on Monday.