Department profile
Sidley Austin LLP

Antitrust

USA Guide 2026 : New York


Sidley Austin LLP

Rankings

Chambers Review

Provided by Chambers

Antitrust - New York

Band 5

Band 5


What the Team is Known For

The Antitrust team at Sidley Austin LLP regularly represent clients in a variety of litigation and transactional matters, often involving notable and pertinent issues such as the use of AI and algorithmic pricing. The team are also adept at providing clients with transactional advice in areas ranging from pharmaceuticals to banking and finance.

Work Highlights

Provided by Chambers

  • Sidley Austin LLP represented Citigroup Inc. and affiliates in a putative class action alleging that payment cardholders are charged fees on transactions in violation of California state antitrust laws.

Strengths

Provided by Chambers

  • Sidley have a great group of partners.

    Antitrust respondentUSA
  • Sidley Austin give excellent advice to better inform risk versus reward for our choices.

    Antitrust respondentUSA
  • Sidley Austin's lawyers are antitrust experts who have a deep knowledge of the financial services and payment industry.

    Antitrust respondentUSA

Notable Practitioners

Provided by Chambers

  • Band 3Juan Arteaga
    Band 3Juan Arteaga

    Juan Arteaga

    Juan Arteaga is commended for his work across both civil and criminal agency investigations. Clients benefit from his experience as a former DOJ Antitrust Division Deputy Assistant Attorney General.
    • He blends a deep expertise in antitrust doctrine with a strong practical litigation perspective.

      Antitrust respondentUSA
    • Juan has deep knowledge, experience and a practical perspective on the regulatory and enforcement landscape and he tailors advice to the nature and size of the company.

      Antitrust respondentUSA
    • Juan is efficient and practical-minded with a good eye toward what is important for a business during litigation.

      Antitrust respondentUSA
    • He is a substantive expert with a keen ability to see issues, predict outcomes and speak in business terms.

      Antitrust respondentUSA
    • He has an extensive network within various industries and the Department of Justice, enabling smooth and effective communication.

      Antitrust respondentUSA
  • Band 4Mary Marks
    Band 4Mary Marks

    Mary Marks

    Mary Marks is commended for her work advising clients on the antitrust aspects of significant corporate transactions. She has particular expertise in HSR filings.
    • She is extremely sharp and thinks about lots of different factors.

      Antitrust respondentUSA
    • She is a true expert, with years of experience dealing with complicated transactions and analyses.

      Antitrust respondentUSA
  • Band 5Benjamin R. Nagin
    Band 5Benjamin R. Nagin

    Benjamin R. Nagin

    Benjamin R. Nagin of Sidley Austin LLP is recognized for his antitrust litigation expertise particularly in the banking and finance sector. He has notable experience advising clients on government investigations and multi-jurisdictional class actions.

    • His leadership, intellect and savvy is standout and he delivers practical actionable client advice.

      Antitrust respondentUSA
    • He is excellent, has extensive experience and is a great partner and advocate.

      Antitrust respondentUSA

Ranked Individuals at Sidley Austin LLP (3)

New York

Sidley Austin LLP has rankings in the following guides

What success is built on

Chambers is the leading data and intelligence partner for the legal sector.

Explore thought leadership