Druckenmiller said he reduced his Nvidia bet after "the stock went from $150 to $900."

TipRanks' analyst ranking service highlights Wall Street's best-performing stocks, including Coca-Cola and Energy Transfer

"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.