Department profile
Cleary Gottlieb Steen & Hamilton LLP

Antitrust

USA Guide 2026 : USA - Nationwide

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Cleary Gottlieb Steen & Hamilton LLP

Rankings

About

Provided by Cleary Gottlieb Steen & Hamilton LLP

For more information about Cleary Gottlieb's Antitrust practice, please visit https://www.clearygottlieb.com/practice-landing/antitrust

Chambers Review

Provided by Chambers

Antitrust - USA - Nationwide

Band 1

What the Team is Known For

Cleary Gottlieb Steen & Hamilton LLP is an outstanding DC-based practice that collaborates with a complementary European network to provide seamless national and international antitrust representation. The firm provides a premium clientele with guidance on class actions, criminal investigations and mergers receiving scrutiny from regulatory agencies, as well as offering pre-merger advice and guidance, and support defending against cartel allegations. It has particularly strong client relationships in the telecommunications, natural resources and financial service sectors. The group excels in cases involving price-fixing allegations, market monopolization and bond and debt manipulations.

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Work Highlights

Provided by Chambers

  • Cleary Gottlieb Steen & Hamilton served as antitrust counsel to Tempur Sealy in a vertical merger challenge brought by the FTC to Tempur Sealy’s $5 billion acquisition of Mattress Firm Group.

Strengths

Provided by Chambers

  • Cleary takes a thoughtful and informed approach. They have incredible experience and leverage it to our benefit. The team is excellent with broad and deep experience in all areas, as well as industry-specific experience.

    Antitrust respondentUSA

  • The team at Cleary are first-rate lawyers and deep subject matter experts. They have seen it all and possess immense pattern recognition skills.

    Antitrust respondentUSA

  • Cleary Gottlieb’s antitrust team has a combination of deep expertise, practical judgment and exceptional strategic insight.

    Antitrust respondentUSA

  • Cleary's antitrust team stands out for its exceptional technical quality and deep substantive command of antitrust law, consistently delivering precise and rigorous analyses aligned with the highest international standards.

    Antitrust respondentUSA

Notable Practitioners

Provided by Chambers

  • Heather Nyong'o
    Heather Nyong'o

    Heather Nyong'o

    Heather Nyong'o acts for a wide array of clients in the oil and gas, technology and pharmaceutical spheres in both civil and criminal investigations.

    • Heather is very good tactically, particularly on litigation matters.

      Antitrust respondentUSA

    • Heather is a zealous advocate – very sharp and has great credibility with the Department of Justice.

      Antitrust respondentUSA
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  • Jeremy Calsyn
    Jeremy Calsyn

    Jeremy Calsyn

    Jeremy Calsyn is accomplished in criminal antitrust litigation, particularly cases concerning price-fixing investigations. He is well known for his work on behalf of automotive parts suppliers.

    • Jeremy is incredibly responsive and commercial. He understands that we are looking for a path forward and helps us understand our options.

      Antitrust respondentUSA

    • Jeremy is very practical, efficient and strategic. He gets great results.

      Antitrust respondentUSA

    • Jeremy is incredibly smart and practical. He is willing to take positions and stand behind them. He knows the law and agencies.

      Antitrust respondentUSA

    • Jeremy is really someone who can do it all.

      Antitrust respondentUSA
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Ranked Individuals at Cleary Gottlieb Steen & Hamilton LLP (2)

USA - Nationwide

Members

Provided by Cleary Gottlieb Steen & Hamilton LLP

Cleary Gottlieb Steen & Hamilton LLP has rankings in the following guides

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