Billionaire investor Warren Buffett, who leads Berkshire Hathaway (NYSE: BRK.B)(NYSE: BRK.A), has made an artificial intelligence company the largest holding in Berkshire's $371 billion portfolio. Ironically, that may not have been his intention when he first purchased the stock in early 2016.

Warren Buffett has long been a fan of iPhone maker Apple (NASDAQ: AAPL). He's repeatedly praised the company for its strong brand power. Loyal iPhone users continually buy new phones, creating billions of dollars in profit that trickle back to Buffett via dividends and share repurchases.

Today, Apple is using artificial intelligence (AI) to strengthen its core business, and its stock has appreciated considerably over the past eight years.

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Source Fool.com