In the first eight months of the year, companies have announced mergers and acquisitions worth more than $3.6 trillion globally, with $1.8 trillion of that activity in the U.S., according to Dealogic. Deals are on track to surpass the record set in 1995, the heyday of Wall Street M&A activity. $SPX $SPY $DIA $QQQ Big deals have meant big money for investment banking firms like Goldman Sachs, the top M&A firm in the U.S., in terms of advisory revenues. Goldman generated more than $1 billion in advisory fees in each of the past three quarters. JPMorgan Chase, Morgan Stanley, Bank of America and Citigroup round out the top five M&A firms so far this year, according to FactSet.