How good of a year was it for The Am Law 100′s top dealmakers and their firms? The best year ever, with $4.7 trillion in announced deals—up more than 40 percent from 2014.

Driving the work were multibillion-dollar and supremely complicated mergers and acquisitions. Such as a carve-out involving 52 facilities in 35 countries. One market’s first dual-currency financing. Proxy fights. Multitier tranches.