"I was 100% responsible for the Paramount decision," Buffett said. "It was 100% my decision, and we've sold it all and we lost quite a bit of money."

Berkshire reported that its Apple bet was worth $135.4 billion, implying around 790 million shares. That would mark a decline of around 13% in the stake.

Artificial intelligence has both "enormous potential for good and enormous potential for harm," the investing guru said during Berkshire's annual meeting.

Nihon Global's proposal at Toyo Suisan is a lesson on shareholder activism in Japan.

The Oracle of Omaha's annual event kicked off with wares from See's Candies to the latest Squishmallows of Warren Buffett and Charlie Munger.

The absence of Charlie Munger will be on everyone's mind when Berkshire Hathaway's annual shareholder meeting kicks off Saturday in Omaha.