Our professionals

Our professionals


Marcio Soares

Marcio Soares
55 11 3147 2701 | 55 21 3231 8120 msoares@mattosfilho.com.br Rio de Janeiro

Areas of expertise


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


Marcio serves as co-chair of the Working Group on International Cartels of the International Bar Association’s (IBA) Antitrust Committee and is a member of the International Committee of the Antitrust Section of the American Bar Association (ABA). He is also a board member of the Brazilian Institute for the Study of Competition, Consumption and International Trade (Ibrac). Marcio is a guest professor in Fundação Getúlio Vargas’s graduate program in Rio de Janeiro, and has written a number of articles on antitrust law published in Brazil and abroad.


Bachelor of Laws – Universidade do Estado do Rio de Janeiro

Postgraduate Degree in Private Law – Universidade do Estado do Rio de Janeiro

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


Análise Advocacia 500 – Antitrust (2019; 2020 – 2021); Banking (2020); Chemical and Petrochemical (2019 – 2021); Regulatory (2019); Specialized Services (2020); Technology (2019; 2021); São Paulo (2020 – 2021);

Chambers Brazil (formerly Chambers Latin America) – Competition & Antitrust (2014; 2021);

LACCA Approved – Antitrust (2017; 2021 – 2022);

Latin Lawyer 250 – Antitrust & Competition (2014; 2020 – 2021);

The Legal 500 – Competition & Antitrust – Leading individual (2014; 2022);

Who’s Who Legal Brazil – Competition (2016; 2020 – 2021);

Who’s Who Legal Global – Competition (2021-2022);

Who’s Who Legal Thought Leaders – Brazil – Competition (2020 – 2022).


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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