The 5 biggest M&A deals of the year (so far) By: CNBC.com News September 10, 2015 at 01:20 AM EDT 2015 has been a boom year for mergers and acquisitions (M&A), as companies around the world seek to expand and diversify. Read More >> Related Stocks: Alstom S.A. Energy Transfer Equity LP General Electric Kraft Heinz Company MS&Ad Ins Group ADR Morgan Stanley Royal Dutch Shell Cl B ADR Williams Companies