Many investors have soured on this former market darling, but that may be a "go" sign for new buyers in light of its quiet and underappreciated progress on the AI front.

Famed investor Warren Buffett is donating $6 billion worth of his company's stock to five foundations, bringing the total he has given to them since 2006 to roughly $60 billion, based on their value when received.

The 94-year-old billionaire donated nearly 12.4 million Class B shares of Berkshire Hathaway, a June 27 news release says. Buffett has led the Omaha-based company since 1965, and it now owns dozens of other companies, including Dairy Queen, Duracell and Geico.