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Our professionals


Amadeu Ribeiro

Amadeu Ribeiro
1 646 695 1101 amadeu@mattosfilho.com.br New York


Amadeu is the resident partner in charge of our New York office and a member of our Antitrust and Corporate Investigations practices. He advises on complex antitrust matters, including merger review cases, cartel and dominance investigations, as well as competition-related matters in general. Over his career, Amadeu has advised clients from various sectors, including aviation, automotive, food & beverage, pharmaceutical, natural resources and technology. Amadeu is part of the leadership of the American Bar Association – Antitrust Law Section and the Vice-President of the Brazilian-American Chamber of Commerce in New York. He is also an adjunct professor of antitrust law at the Fordham University School of Law in New York.


Bachelor of Laws – Universidade de São Paulo (USP)

Doctor of Laws – Universidade de São Paulo​ (USP)

LL.M. (cum laude) – Fordham University School of Law


American Bar Association – Outstanding Performance Award (2021)

Análise Advocacia 500 – Antitrust (2020-2021)

Chambers Brazil (formerly Chambers Latin America) – Competition & Antitrust (2012-2022)

Euromoney Expert Guides – Best of the Best Latin America (2015), Competition and Antitrust (2008, 2020)

Global Competition Review – 40 under 40 (2012)

LACCA Approved – Antitrust & Competition (2015, 2021-2022)

LACCA Thought Leaders – Antitrust (2019-2020)

Latin Lawyer 250 – Antitrust and Competition (2012-2021)

The Legal 500 – Competition & Antitrust (2012, 2017)

Who’s Who Legal Brazil – Competition (2014, 2017-2021)

Who’s Who Legal Global – Competition, Competition: Future Leaders (2021)

Who’s Who Legal Thought Leaders – Brazil – Competition (2021)

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With Amadeu Ribeiro
Chambers & Partners

Investing In… 2021

Brazil has a civil law system. Accordingly, and unlike the common law systems where court decisions are a principal source of law, the Brazilian legal system is based upon codified law and not upon judicial precedents. This means that, with the exception of certain appellate decisions that have general applicability, judicial decisions in Brazil are not binding precedents that must be followed by subsequent courts.

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Latin Lawyer

Brazil approves Elanco-Bayer US$7.6 billion animal health deal

​Paul, Weiss, Rifkind, Wharton & Garrison LLP in New York and Washington, DC, and Mattos Filho, Veiga Filho, Marrey Jr e Quiroga Advogados in São Paulo have helped US company Elanco Animal Health obtain Brazilian antitrust clearance for its US$7.6 billion global acquisition of German pharma company Bayer’s animal health business.

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