Marcio Soares > Mattos Filho > Rio de Janeiro, Brazil > Lawyer Profile

Mattos Filho
RIO DE JANEIRO, RJ , CEP 22210-901
Marcio Soares photo

Work Department

Antitrust / Corporate Investigations




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.


Portuguese and English


Co-Chair of the Cartels Working Group at the Antitrust Committee of the International Bar Association (IBA); Member of the Brazilian Institute of Competition, Consumer Affairs and International Trade Law Review (IBRAC)


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

Lawyer Rankings

Brazil > Competition and antitrust

(Leading individuals)

Marcio SoaresMattos Filho

The competition law experts at Mattos Filho act as ‘true partners with clients in carrying out extremely strategic work‘. The team’s workload strikes a balance between merger control and conduct cases, with recent highlights including its representation of food tech company iFood in the high-profile dominance investigation concerning the client’s exclusivity contracts with restaurants. In the merger space, the department’s vast experience before CADE also extends to non-fast-track merger review cases and the negotiation of remedies. The firm’s traditional strength in dispute resolution is of particular benefit when it comes to antitrust litigation, where competition and litigation specialists work together to represent clients in appealing CADE decisions. 2021 saw the practice expanding further, first with the arrival of Eduardo Frade in August of that year from Vinicius Marques de Carvalho Advogados, and later with the hire of senior associate Venicio Filho from TozziniFreire AdvogadosRenata Fonseca Zuccolo Giannella is ‘very hands on and proactive‘; Lauro Celidonio Gomes dos Reis Neto is noted for his longstanding expertise in the field of competition law; Marcio Soares is ‘very diplomatic and manages to deal assertively and carefully with authorities and other parties involved in cases‘; Amadeu Ribeiro is the name to note in New York; and Michelle Machado specialises in competition, corporate investigations and digital markets. Associate Paula Camara Baptista De Oliveira is also noted.