J. Mark Gidley

White & Case
Washington, D.C.

Practice Area: Antitrust, Competition

    All Star


    “Mr. Gidley has the sharpest legal mind of any attorney I've ever used.”
    “He stands apart from my other attorneys.”


    J. Mark Gidley chairs the White & Case Global Antitrust/Competition practice, which is the only such practice to have been named Competition Group of the Year for seven years by Law360. In 2019 and again in 2020, Mark was named “Competition MVP” by Law360 for the second and third times.

    Mr. Gidley is among the most experienced lawyers in the US in trying criminal and civil antitrust cases, whether involving claims of price-fixing, monopolization, or arising from a merger. His US trial victories include: wins over the US DOJ in Foreign Exchange case (criminal) US v Usher, Stolt I and Stolt II (criminal cartel/amnesty agreement), Ian Norris (criminal cartel/obstruction), and Sungard (merger) and AgriMark (merger); and trial victory over the FTC in FTC v. Schering-Plough (the first reverse payment trial in the US); trial victories over class actions and opt-out litigants (Toshiba LCD $2.7 billion direct purchaser class action; Toshiba LCD $2.4 billion Best Buy trial, Heveafil). His cases have shaped modern antitrust law in mergers, cartels, monopolization, and pharma antitrust. Mr. Gidley’s trial and appellate experience informs his approach to evidence gathering, dispositive motions, and counseling clients.

    His experience in transnational mergers spanning multiple and often conflicting antitrust regimes includes being co-editor of the Worldwide Merger Notification Requirements, a comprehensive compendium of global merger filing regimes in more than 210 jurisdictions, which is based on the firm’s global merger clearance experience.

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