Department profile
O'Melveny & Myers LLP

Antitrust

USA Guide 2026 : District of Columbia


O'Melveny & Myers LLP

Rankings

About

Provided by O'Melveny & Myers LLP

Consistently ranked among the top global antitrust practices, we bring credibility and teamwork to everything we do, from precedent-setting courtroom victories to deft handling of merger reviews by agencies around the world.

Our litigation abilities range from extricating clients early and efficiently to achieving . And when it comes to shepherding transactions through global clearance processes, we are practice leaders. We routinely handle complex international mergers and obtain clearance in challenging situations.

We have a reputation for sophisticated, practical antitrust strategy that couples cutting-edge economic and doctrinal analyses with an adept reading of the regulatory and political environment, even under the tightest timeframes. And we are one of the few firms whose partners have tried—and won—cases for and against, the government.

With a team that includes veterans of the US Department of Justice’s Antitrust Division and the Federal Trade Commission, we offer clients an insider’s perspective, bolstered by our close partnerships with renowned economists and consultants.

Chambers Review

Provided by Chambers

Antitrust - District of Columbia

Band 5

Band 5


What the Team is Known For
O'Melveny & Myers LLP has a prominent antitrust team with comprehensive litigation expertise and a strong merger clearance practice, handling major global transactions. Represents numerous household-name clients in some of the biggest US and worldwide cases, including class actions and multidistrict litigation. Acts for clients from the transport, technology and financial services industries, among others.

Work Highlights

Provided by Chambers

  • O'Melveny & Myers LLP advised AT&T in responding to a Civil Investigation Demand in connection with the DOJ's investigation of T Mobile’s proposed acquisition of UScellular.

Strengths

Provided by Chambers

  • O'Melveny & Myers have a strong understanding of the challenges and good insight on the market. They are always available, prepared and provided strategy throughout.

    Antitrust respondentUSA
  • O'Melveny are subject matter experts on a wide array of issues and is a go-to law firm for all complex and sophisticated matters. They relay complex concepts in an easily digestible manner and produce excellent work product.

    Antitrust respondentUSA
  • O'Melveny & Myers are very practical and knowledgeable. They give business-oriented and straightforward advice. They have significant experience and expertise and regularly interact with the agencies to assist clients.

    Antitrust respondentUSA

Notable Practitioners

Provided by Chambers

  • Band 3Ian Simmons
    Band 3Ian Simmons

    Ian Simmons

    Ian Simmons co-chairs the antitrust practice at the firm. He is a trial lawyer noted for his decades of experience litigating in the space. He has notable expertise in price-fixing cases and also handles governmental investigations.

    • Ian is phenomenal with the subject matter and he leads the way in understanding tricky and very difficult areas.

      Antitrust respondentUSA
    • Ian is a very strong advocate and master of antitrust law. He deploys his experience well in his strategy.

      Antitrust respondentUSA
  • Band 5Lauren Weinstein
    Band 5Lauren Weinstein

    Lauren Weinstein

    Lauren Weinstein is a talented practitioner who advises clients on sophisticated antitrust litigation. She often represents clients in the technology space.

    • Lauren is incredibly smart. She understands the issues and provides invaluable insight and practical advice.

      Antitrust respondentUSA
  • Up and ComingBrian Quinn
    Up and ComingBrian Quinn

    Brian Quinn

    Brian Quinn is commended for his experience across a broad range of antitrust matters. He is particularly strong at handling price-fixing disputes and counseling clients.

    • Brian is an extremely bright and strategic thinker. He is great to work with and handles complex matters with professionalism and sophistication.

      Antitrust respondentUSA
    • Brian is very bright and experienced.

      Antitrust respondentUSA
    • Brian was dedicated and very knowledgeable in the space. He was very instrumental in our success.

      Antitrust respondentUSA
    • Brian is very accomplished. He oozes quality, is all over the detail in a complex case and his drafting is top quality.

      Antitrust respondentUSA

Ranked Individuals at O'Melveny & Myers LLP (3)

District of Columbia

Members

Provided by O'Melveny & Myers LLP

O'Melveny & Myers LLP has rankings in the following guides

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