Berkshire Hathaway recently filed its second-quarter 13F form, revealing its stock holdings at the end of June.

In May, a 13F filing revealed that Berkshire Hathaway was buying mystery stocks. Now, at last, we know what they are.

Warren Buffett is the world’s most famous investor and is renowned for his sober, long-term approach to the substantial equity stakes he takes in companies. One of his best-known sayings about Berkshire Hathaway is,

Buffett owned UnitedHealth shares before selling his stake in 2010, though his Berkshire Hathaway recently acquired shares.

Shares of UnitedHealth Group surged nearly 14% on Friday after billionaire Warren Buffett's Berkshire Hathaway bought 5 million shares of the company, providing a shot in the arm for investors who think the health conglomerate will turn around under its new CEO.

What Happened: The undisclosed investments of Berkshire Hathaway have been made public. The company has reportedly invested in steelmaker Nucor NUE +1.07% Get Free Report , homebuilders D.R. Horton DHI +1.30% Get Free Report and Lennar LEN +1.56% Get Free Report , with the total investments amounting to $1.8 billion.

Gold, silver and Bitcoin have given stellar returns in the last one year. While Robert Kiyosaki calls them "real money" and a shield against inflation, Warren Buffett dismisses gold and Bitcoin as unproductive assets.

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Even with that vast lead, the report shows, OpenAI is expanding its margin over its much smaller competitors, including even Gemini, which is part of Google and its giant parent, Alphabet (2024 revenue: $350 billion).