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In a surprising turn of events, Warren Buffett’s Berkshire Hathaway (BRK.A)(BRK.B) has been quietly amassing shares of Chubb Limited (CB), a leading property and casualty insurance provider. The revelation, unveiled after an SEC disclosure exemption expired, highlights an intriguing strategic move by the Oracle of Omaha: investing heavily in a direct competitor to Berkshire’s own insurance empire.