Guilherme Ribas


TozziniFreire Advogados


Antitrust & competition

[email protected]

LACCA Approved


Guilherme Ribas specialises in antitrust litigation and counselling across a variety of industries in Brazil, including air transportation, food and beverage, technology, textile, oil and gas, and plastics; he currently focuses on cartel investigations, merger filings and compliance. He has an in-depth knowledge of Brazilian antitrust laws and practice. Prior to joining Tozzini Freire, Guilherme Ribas worked as an antitrust lawyer at other major Brazilian firms and was head of the department at the Secretariat at Economic Law (SDE) at the Ministry of Justice, where he coordinated the first dawn raids ever carried out in Brazil and prepared the governmental 2004 antitrust compliance guidelines.

Ribas is publications officer of the Brazilian Antitrust Institute (IBRAC), and member of the antitrust committee of the Brazilian Bar (São Paulo section).

He holds a doctorate (PhD) degree in administrative law (thesis: evidence in cartel investigation) and an LLM in commercial law (intellectual property and antitrust), both from the University of São Paulo. He is the author of many books and articles related to antitrust, such as Cartel Investigations Administrative Proceedings (2016).

Mr Ribas has been consistently recognised by well-known legal market research publications, such as Global Competition Review (GCR 100), Chambers Latin America, The Legal 500, Best Lawyers and Latin Lawyer 500.

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