TozziniFreire Advogados

Guilherme Ribas

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Practice Areas

Competition Law


Ribas has twenty years of experience in competition law, having worked at both public agencies and private companies, assisting clients in different industries, such as pharmaceutical, technology, food and beverages, transportation and O&G. His practice is focused on advising clients on cartel investigations and unilateral conducts, as well as on mergers and compliance programs. He served as general coordinator in the now extinct SDE (Secretariat of Economic Law) of the Ministry of Justice, where he conducted the first antitrust dawn raids and drafted the antitrust compliance guidelines (SDE Ordinance No. 14/2004).

Professional Memberships

Director of publications at IBRAC (Brazilian Institute of Studies of Competition, Consumer Affairs and International Trade).

Member of the Competition and Economic Regulation Studies Committee of OAB-SP (Brazilian Bar Association, São Paulo section).


University of São Paulo Law School (PhD, 2015, thesis: Cartel evidence; LLM, 2011, dissertation: Tying, competition and IP; LLB, 1999); Fundação Getúlio Vargas Law School (post-graduate in antitrust law, 2004).