Warren Buffett finally reveals the mysterious company he’s invested billions of dollars in CNNWorld Street | Buffett’s Berkshire bets big, Cisco’s beats Street, meme stock mania muted, China mulls… MoneycontrolWarren Buffett’s Berkshire Reveals Its Mystery Stock: Chubb The Wall Street JournalWarren Buffett’s Berkshire Hathaway reveals new $7 billion stake in Swiss insurer Chubb The Associated PressWarren Buffett’s Berkshire Hathaway reveals insurer Chubb as confidential stock it’s been buying CNBC