Insurer Ace Limited acquired the original Chubb in 2016 for $29.5 billion in cash and stock, and the combined company adopted the Chubb name. His conglomerate Berkshire Hathaway has bought nearly 26 million shares of Zurich-based Chubb for a stake worth $6.7 billion. Warren Buffett finally revealed his secret stock pick in a new regulatory filing, and it's insurer Chubb . Mystery unveiledBerkshire has been keeping this purchase secret for three quarters straight. Berkshire was granted confidential treatment to keep the details of one or more of its stock holdings confidential.

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Persons: Warren Buffett, Chubb, Evan Greenberg, Maurice Greenberg Organizations: Berkshire, Ace, American International, Berkshire Hathaway, Alleghany, Chevron, Verizon Locations: Omaha , Nebraska, Zurich, The Omaha, Berkshire, Markel, Omaha