Department profile
Arnold & Porter

Antitrust

USA Guide 2026 : District of Columbia

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Arnold & Porter

Rankings

Chambers Review

Provided by Chambers

Antitrust - District of Columbia

Band 1

What the Team is Known For
Arnold & Porter is a superb DC firm that offers the full package of antitrust services, such as high-profile merger clearance, as well as civil litigation and criminal investigations. Equally well suited to handle investigations by US and international authorities. Serves an enviable client roster of leading companies in a huge variety of sectors, including technology, oil and gas and financial services.
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Work Highlights

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  • Arnold & Porter advised Boston Scientific on the antitrust aspects of its $3.7 billion acquisition of Axonics.

Strengths

Provided by Chambers

  • Arnold & Porter is a go-to firm for major deals with significant antitrust risk. The lawyers are practical, very responsive and know all of the players at the commission. Their regulatory knowledge and experience is unmatched.

    Antitrust respondentUSA

  • Arnold provide top-tier expertise coupled with practical advice on litigation strategy.

    Antitrust respondentUSA

  • Arnold & Porter's team have deep expertise and experience especially with the FTC. They can handle all types of matters from an antitrust standpoint with a practical approach.

    Antitrust respondentUSA

  • Arnold & Porter bring a deep level of expertise and a strong collaboration. They are client-focused, subject matter experts and their responses are very prompt and efficient.

    Antitrust respondentUSA

  • Arnold & Porter is well-versed in navigating the regulatory process and has a deep bench of lawyers who are smart, strategic and adept. They produce thoughtful, highly polished written work product.

    Antitrust respondentUSA

Notable Practitioners

Provided by Chambers

  • Deborah Feinstein
    Deborah Feinstein

    Deborah Feinstein

    Deborah Feinstein counsels clients in high-stakes merger clearance proceedings, as well as handling investigations and litigation. She is able to draw on her considerable experience both in private practice and in government, including her role as Director of the Bureau of Competition at the FTC.

    • Debbie has a sharp mind and laser-like focus on the facts and issues that matter. She draws from her extensive experience to tailor her arguments.

      Antitrust respondentUSA

    • Deborah is an extremely trusted counsel with a high level of expertise.

      Antitrust respondentUSA

    • Debbie is extremely practical and hard-working. She has excellent judgment when interacting with agencies.

      Antitrust respondentUSA

    • Deborah is outstanding and one of the best in the country. She is hard-working, savvy and tough.

      Antitrust respondentUSA
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  • Jonathan Gleklen
    Jonathan Gleklen

    Jonathan Gleklen

    Jonathan Gleklen is particularly adept at guiding clients through antitrust merger review and anticompetitive conduct investigations. He is well known for his work with clients in the technology sector in particular.

    • Jonathan is a very smart and sharp lawyer.

      Antitrust respondentUSA

    • Jonathan is an excellent antitrust attorney who knows our company extremely well.

      Antitrust respondentUSA

    • Jonathan is a brilliant and smart antitrust lawyer and a staunch advocate for his client. He's really strong, extremely bright and tough.

      Antitrust respondentUSA
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  • Michael B Bernstein
    Michael B Bernstein

    Michael B Bernstein

    Michael Bernstein has a broad practice securing transactional clearance from US and international competition agencies, as well as managing investigations and litigation. He chairs the US practice group.

    • Michael is an excellent and pragmatic antitrust attorney with invaluable agency relationships. He moves quickly to provide advice and advance matters forward. He takes the time to truly understand our business and adeptly explains complex issues.

      Antitrust respondentUSA
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  • Sonia Pfaffenroth
    Sonia Pfaffenroth

    Sonia Pfaffenroth

    Sonia Pfaffenroth is commended for her broad antitrust practice. She has notable strength in litigation and merger challenges.

    • Sonia is a really remarkable attorney. She is very good at navigating other counsel and keeping the scope and the focus where it belongs.

      Antitrust respondentUSA

    • Sonia is very smart, sharp and knowledgeable. She is committed, diligent and hard-working.

      Antitrust respondentUSA

    • Sonia is personable and easy to work with, which has proven to be an asset in negotiation.

      Antitrust respondentUSA
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  • Laura S Shores
    Laura S Shores

    Laura S Shores

    Laura Shores is an accomplished attorney noted for her work as a litigator in the antitrust space. She is particularly skilled at handling class actions.

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  • Matthew Tabas
    Matthew Tabas

    Matthew Tabas

    Matthew Tabas is a talented practitioner noted for his work across transactional matters. He is particularly well-versed in advising clients in the healthcare sector.

    • Matt keeps up with the ever-changing antitrust landscape.

      Antitrust respondentUSA

    • Matt is incredibly responsive, pragmatic and knowledgeable.

      Antitrust respondentUSA

    • Matt is strong in his subject matter and does amazing work for our business. His client service is exceptional.

      Antitrust respondentUSA

    • Matt is a very experienced merger lawyer with a lot of agency insight.

      Antitrust respondentUSA
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Ranked Individuals at Arnold & Porter (6)

District of Columbia

Arnold & Porter has rankings in the following guides

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