Marcelo A. den Toom

Marcelo den Toom is the partner in charge of the Competition/Antitrust and Foreign Trade departments and he is a member of the Mergers and Acquisitions department.

His practice concentrates on the defense of merger transactions, acquisitions and joint ventures before the competition authorities, investigations into anti-competitive and anti-dumping practices, compliance, anticorruption rules, drafting and negotiating corporate acquisition contracts and related documents and advice on corporate and contractual matters.

Between 1998-1999, he worked as a foreign associate for Skadden, Arps, Slate, Meagher & Flom (New York) and Haynes & Boone (Houston). In 2000, he was admitted to the Bar of the state of New York.

As a specialist in competition law, he has frequently been recognized by publications such as Chambers Latin America, Best Lawyers, Practical Law Company, Guide to the World's Leading Competition and Antitrust Lawyers, International Who’s Who of Competition Lawyers and Economists and Latin Lawyer.

Education and training

  • Universidad de Belgrano
    Law, 1993

    University of Illinois
    School of Law, Spring Semester 1992

    University of Michigan
    LL.M., 1998

    Universidad Torcuato di Tella
    Specialization in Microeconomics, 2009


Chambers Latin America
Band 1 (Competition/Antitrust)

Legal 500
Band 2, Leading lawyer (Competition/Antitrust)

The Best Lawyers in Argentina (2019 Edition)
Competition / Antitrust Law, Lawyer of the year 2019

Guide to the World's Leading Competition and Antitrust Lawyers
Mentioned as one of the best Competition/Antitrust lawyers in the country

Who’s Who - Global Guide 2022
Thought Leader

Latin Lawyer
40 under 40 (ranking of Argentine lawyers under 40 years old)
40 under 40 – antitrust (ranking of lawyers under 40 years old in the principal countries of Latin America, USA and Europe)

Approved lawyers, Antitrust, 3, Thought Leader (2020)


Professor of Commercial Companies at Universidad de Buenos Aires.

Professor of Competition Law in the Masters in Business Law at Universidad Austral and at Universidad Simón Bolívar.

Author of Competition Law in Argentina, Wolters Kluwer (2012).

Author of the Chapter on Argentina of Antitrust Issues in International Intellectual Property Licensing Transactions (Section of Antitrust, American Bar Association, 2012), Getting the Deal Through: Merger Control (2000-), Getting the Fine Down: Cartels (both publications connected with the Global Competition Review), International Mergers: the Antitrust Process (Sweet & Maxwell, 2001-) and Merger Control Worldwide and Anti-Cartel Enforcement (Cambridge University Press, 2004- and 2009-, respectively).


Co-Chair of the International Antitrust Committee of the International Law Section of the American Bar Association (2014-2015).

President and Vice-president of the Competition Commission of the Bar Association of the City of Buenos Aires.