Buffett's Big Insurance Bet Rakes In $830 Million Since September

Group 1 - Warren Buffett's Berkshire Hathaway has increased its position in Chubb Ltd. by 16%, adding 4,299,111 shares to reach a total of 31,332,895 shares by the end of September [3] - Chubb shares have gained 9.1% since the increase, contributing to significant gains for Berkshire Hathaway [3] - The value of Berkshire's position in Chubb has risen from approximately $1.21 billion to about $1.33 billion, resulting in a gain of approximately $830.95 million since September [4] Group 2 - Berkshire Hathaway's stock has increased by 9.9% in 2025, while the S&P 500 ETF Trust has risen by 13.3%, indicating potential underperformance against the index [6] - Despite recent gains from new positions, including Alphabet Inc., Berkshire Hathaway is still likely to underperform the S&P 500 for the year [2][5] - Chubb is one of the top gainers in Berkshire's portfolio, ranking as the eighth largest holding at the end of the third quarter [5]