Warren Buffett’s Berkshire Hathaway reveals insurer Chubb as confidential stock it’s been buying

Warren Buffett's Berkshire Hathaway disclosed its confidential stock purchase, revealing a $6.7 billion stake in Zurich-based insurer Chubb. This acquisition, involving nearly 26 million shares, makes Chubb the ninth largest holding in Berkshire's portfolio. The revelation followed a significant increase in Chubb's share price and came after Berkshire maintained secrecy over the investment for three consecutive quarters.