Partner in Demarest’s Corporate Investigations practice area, with emphasis on Competition matters, Marco Fonseca holds a master’s degree in Law from the Universidade de Brasília (UnB), a postgraduate degree in Public Law and Regulation from Fundação Getúlio Vargas (FGV) and a bachelor’s degree in Law from Centro Universitário de Brasília (UniCEUB). Marco has more than 15 years of experience in Antitrust Law. He represents the interests of several clients mainly in cases of anticompetitive conduct, whether on behalf of the claimant or the defendant. Marco also concentrates his practice on the submission of acts of economic concentration to the Administrative Council for Economic Defense (“CADE”), in addition to advising on competitive issues. Marco Fonseca works at the firm's office in Brasília and is in constant and direct contact with public authorities. He is a guest professor in postgraduate courses at IBMEC, Universidade de Brasília (UnB), and several other institutions. He is also a regular speaker at academic events focused on Competition Law. Marco is mentioned by important international rankings, such as Latin Lawyer and Legal 500.

  • Advises the Brazilian Association of Worker Benefit Companies (ABBT) before CADE on complaints involving anti-competitive practices in the benefits voucher market.
  • Defends Bayer in a CADE investigation involving alleged anti-competitive practices between the human resources departments of companies operating in the health sector.
  • Advises MS Amlin in a CADE investigation involving the alleged sharing of competitively and commercially sensitive information in the aviation and aerospace insurance and reinsurance brokerage market and related ancillary services.
  • Advised H. Hemo before CADE on the submission of the acquisition of H. Hemo and Vita, which are hemotherapy companies, by BTG Pactual.
  • Advised Conedi Participações on the acquisition of control of Atlético Mineiro SAF, in the first soccer market transaction analyzed by CADE.
  • Master’s degree in Law from Universidade de Brasília (UnB), Brasília, Brazil (2022)
  • Postgraduate degree/MBA in Public Law and Regulation from Fundação Getúlio Vargas (FGV), Brasilia, Brazil (2013)
  • Bachelor of Laws from Centro Universitário de Brasília (CEUB), Brasília, Brazil (2010)
  • Portuguese and English