Our professionals

Our professionals


Claudio Oksenberg

Claudio Oksenberg


Claudio focuses his practice on local and cross-border M&A, corporate reorganization, private equity and joint venture transactions. He also advises on regulatory matters involving publicly-held and closely-held companies, as well as capital market transactions and financing. Claudio is admitted to practice law in New York. He previously worked as a foreign associate at Sidley Austin LLP and senior associate at the international law firms Shearman & Sterling and Milbank Tweed Hadley & McCloy LLP.


Bachelor of Laws – Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio);

Postgraduate Course in Corporate Law – Instituto Brasileiro de Mercado de Capitais (Ibmec-RJ);

Master of Laws (LL.M.) – Columbia Law School.


Análise Advocacia 500 – Energy (2019–2020, 2022), M&A (2020), Transport (2022), Rio de Janeiro (2020, 2022);Análise Advocacia 500 – Energy (2019–2020, 2022), M&A (2020), Transport & Logistics (2022), Rio de Janeiro (2020, 2022);

Chambers Brazil – Corporate/Commercial: Rio de Janeiro (2022–2023);

Latin Lawyer 250 – Corporate and M&A, Capital Markets (2020–2024);

The Legal 500 – Corporate/M&A (2017–2019);

Who’s Who Legal Brazil – Capital Markets (2021–2023).

Único. The Mattos Filho news portal

Authored publications

Mattos Filho in the media

With Claudio Oksenberg
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.

Click here and learn more.

Areas of expertise

Stay in touch

Get first-hand access to legal analysis from our specialists in different sectors through texts and podcasts. Stay on top of the main issues that impact your business.