Key Takeaways Chubb shares jumped more than 8% in late trade Wednesday evening after Warren Buffett's Berkshire Hathaway revealed a $6.7 billion stake in the insurer. Buffett recently told shareholders that property-casualty insurance provides the core of Berkshire’s well- being and growth. Berkshire had been building its position in Chubb since 2023, but had not previously disclosed the stake after the SEC granted it permission to keep the holding confidential. A measured move in Chubb stock indicates a po ...