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Merger Monday is back. What to buy

Miguel S Salmeron | The Image Bank | Getty Images

Before trading even began Monday, there were three major deals with a unit of UnitedHealth's merging with Catamaran, Horizon Pharmaceuticals' purchase of Hyperion Therapeutics and Teva's takeover of Auspex.

And that's not even counting Intel's purchase of Altera, which is supposedly on the horizon according to a Wall Street Journal report Friday.

Read More How a trader just made $2.4 million in half an hour

All told, 2015 is on track to surpass the record set in 2014 for M&A. Through Friday, there were $414 billion worth of deals in 2015, $49 billion more than than at the same time last year, according to Dealogic.

"Merger Monday" is back. Here's how to trade it.