LAWYER PROFILE
Guilherme Ribas

Guilherme Ribas

Brazil 2026

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Chambers ranking badge

Ranked in 1 practice area

About

Provided by TozziniFreire

Brazil: Contentious

Practice Areas

Competition Law

Career

Guilherme has over 23 years of experience in competition law, having worked at both public agencies and private companies, assisting clients in different industries, such as pharmaceutical, telecommunications, internet, technology, payment service providers, food and beverages, textile, and plastics. 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).

Chambers Review

Provided by Chambers

Chambers Brazil: Contentious

Competition/Antitrust - Brazil

Band 2
Band 2

Individual Editorial

Guilherme Ribas is admired by clients for his adept handling of competition mandates. He often assists clients with sophisticated merger control proceedings, investigations, leniency agreements and monitoring before CADE.

Strengths

Provided by Chambers

  • Guilherme has an excellent command of antitrust law, communicates clearly and remains sharply focused on the defined scope of the investigation.

    Competition/AntitrustChambers Brazil: Contentious

Ranked Individuals at TozziniFreire (87)

Brazil

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