According to a report in [1], the top M&A companies were Goldman Sachs, Morgan Stanley, JP Morgan, Citi, Bank of America, Credit Suisse, Barclays, and Lazard. The report also revealed that global M&A activity remained strong, with a total deal volume of $3.16 trillion. Additionally, Rothschild is a consistent top-performing M&A advisory firm, according to [3]. References: [1] 10 Most Rich M&A Firms in the World - Top Investment Banks [2] Top 10 M&A financial and legal advisers in ... [3] 50 Most Powerful M&A Firms in the World