M&A activity tops $5 trillion in record 2015 By: MarketWatch December 28, 2015 at 18:20 PM EST Mergers and acquisitions announcements made in 2015 have reached record heights with about half of that activity targeting U.S. companies. Read More >> Related Stocks: Allergan Plc Anheuser-Busch Inbev S.A. ADR Anthem Inc Cigna Corp Dow Chemical DuPont USA EMC Corp Energy Transfer Equity LP Macy's Pfizer Time Warner Cable Williams Companies