Our professionals

Our professionals


Marcio Soares

Marcio Soares

Areas of expertise


Marcio has extensive experience in competition matters, representing domestic and foreign clients from various sectors of the economy before the Administrative Council for Economic Defense (Cade) in merger cases, investigations of anticompetitive conduct – especially cartels and abuse of dominant position – negotiating leniency agreements and cease-and-desist agreements (TCCs), as well as in antitrust-related lawsuits and arbitration, competition compliance and general antitrust counseling.


Marcio serves as co-Chair of the Mergers Working Group of the International Bar Association’s (IBA) Antitrust Committee, co-Chair of the Task Force on Competition and Sustainability of the Antitrust Committee of the ICC-Brazil and is a member of the International Committee of the Antitrust Section of the American Bar Association (ABA). Marcio has authored a number of specialized articles on antitrust law published in Brazil and abroad.


Bachelor of Laws – Universidade do Estado do Rio de Janeiro (Uerj);

Postgraduate Degree in Private Law – Universidade do Estado do Rio de Janeiro (Uerj);

Master of Laws (LL.M.) – Columbia Law School, USA.


Chambers Brazil – Competition & Antitrust (2013–2024);

LACCA Approved – Antitrust (2017, 2021–2024);

Latin Lawyer 250 – Antitrust & Competition (2014, 2020–2024);

The Legal 500 – Competition & Antitrust: Leading Individual (2014, 2021–2024);

Análise Advocacia – Antitrust (2018–2024), Chemical & Petrochemical (2018–2021), São Paulo (2018–2021), Rio de Janeiro (2022–2024);

Who’s Who Legal Brazil – Competition (2016, 2020–2023), Thought Leaders Brazil: Competition (2020–2023);

Who’s Who Legal Global – Competition (2021, 2023), Global Elite: Competition (2022–2023).

Único. The Mattos Filho news portal

Authored publications

Mattos Filho in the media

With Marcio Soares
Latin Lawyer

CADE approves Japanese paper buy in Brazil

Mattos Filho, Veiga Filho, Marrey Jr e Quiroga Advogados has helped Japanese manufacturer Daio Paper and Japanese trading company Marubeni obtain antitrust clearance for their joint acquisition of Brazilian paper producer Santher.

Click here and learn more about this deal

Areas of expertise

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