Here Are Warren Buffett’s Top Q1 Stock Buys And Sells Investor’s Business DailyWarren Buffett’s Berkshire Reveals Its Mystery Stock: Chubb The Wall Street JournalBuffett’s Berkshire Reveals $6.7 Billion Stake in Insurer Chubb Yahoo FinanceWarren Buffett’s Berkshire Hathaway reveals insurer Chubb as confidential stock it’s been buying CNBC