NEW YORK/LONDON, June 30 (Reuters) - Global mergers and acquisitions (M&A) activity fell 36% year-on-year in the second quarter, but investment bankers and lawyers expressed optimism that the stock market's recovery will gradually restore chief executives' dealmaking confidence. "Global uncertainty is what is impacting M&A most - it just makes people uncomfortable. It's easier to say, I'll pass on a deal - nobody gets fired for passing on a deal. M&A volumes in the United States declined by 30% to $318.4 billion, while Europe and Asia Pacific volumes shrank 49% and 24% respectively. Not a single so-called mega-deal, which typically refers to transactions worth over $25 billion, was signed during the quarter.

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Persons: Michael Aiello, Weil, Raymond McGuire, Steve Baronoff, Bunge, John Collins, Morgan Stanley, there’ll, Ethan Klingsberg, Deringer, Manolo Falco, Scott Miller, Sullivan, Cromwell, Howard Ellin, Flom, Dwayne Lysaght, Eric Schiele, Kirkland, Ellis, Anirban Sen, Andres Gonzalez, Stephen Coates Organizations: Manges LLP, Lazard Ltd, Bank of America, Reuters Graphics Reuters, Magellan Midstream Partners, Viterra Ltd, Carrier Global, Investment, Citigroup Inc, JPMorgan Chase, Antitrust, U.S . Federal Trade Commission, Horizon Therapeutics, Thomson Locations: United, Europe, Asia, Skadden, Slate, New York, London