Legendary investor Warren Buffett has made a secret investment in the financial sector, with the details to be potentially revealed at the company's annual meeting this weekend. Buffett has been selectively buying stocks in this industry, likely worth billions of dollars. The investment could be in a single large company or spread across multiple firms. It's a notable move given that Buffett has recently reduced his exposure to financial stocks due to concerns about loan defaults and interest rate fluctuations.
