A new stock pick from the 93-year-old Buffett almost always leads some investors to follow suit, quickly moving the share price. Berkshire has been a longtime shareholder in credit rating agency Moody's , and bought a big stake in Citigroup in early 2022. The last financial stock Berkshire bought was Capital One Financial in the first quarter of 2023. If the new stake ever exceeds 5% of whatever stock it is, Berkshire would be required to report its holding with the SEC. Buffett might be asked to reveal the identity of the mystery stock at Berkshire's annual shareholder meeting in early May.

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