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Our professionals


Claudio Oksenberg

Claudio Oksenberg
+55 21 3231 8239 oksenberg@mattosfilho.com.br Rio de Janeiro


Claudio practices in local and cross-border M&A, corporate reorganization, private equity and joint venture operations. He also advises on regulatory matters involving publicly-held and closely-held companies, and is experienced in capital market transactions and financing. Claudio previously worked as a senior associate at the international law firms Shearman & Sterling LLP and Milbank Tweed Hadley & McCloy LLP.


Bachelor of Laws, Pontifícia Universidade Católica do Rio de Janeiro

Postgraduation in Corporate Law, Instituto Brasileiro de Mercado de Capitais

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


Análise Advocacia 500 – Energy (2019-2020), M&A (2020) and Rio de Janeiro (2020)

Latin Lawyer 250 – Corporate and M&A and Capital Markets (2020-2021)

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

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

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

CVM publishes resolution that dispenses the prior approval of marketing materials used in registered public offerings

​On April 30, 2019, the Brazilian Securities Commission (“CVM“) published CVM Resolution No. 818 (“Resolution“) which allows the use of marketing materials in public offerings of securities without CVM’s prior approval, dismissing issuers to make the submission provided for in article 50 and article 51, sole paragraph, of CVM Rule No. 400, published on December 29, 2003, as amended.

Before the publication of the Resolution – except for the pre-approved marketing materials, which only contain basic information about the offering – the release of any advertising materials in connection with the offering, in all types of media, including audiovisuals, depended on the previous approval by the CVM.  The CVM review period was up to ten (10) business days, in case of public offerings of interests in investment fund and up to five (5) business days, in case of public offerings of other types of securities.

The Resolution dismissed the obligation to submit the marketing materials to CVM’s prior approval and established that such materials must be submitted to CVM only within one (1) business day following its use.

Even though the release of marketing materials does not require CVM’s prior approval, the duties and liabilities of the issuer and the intermediary institutions for the information provided to the investors, as well as the guidelines to produce and release marketing materials remain unchanged.

The changes introduced by the Resolution may be temporary and are part of a process to review CVM rules that govern public offerings of securities.  They will provide a basis for CVM to assess advantages and disadvantages of such changes, as well as the best course of action for their implementation in the context of the definitive revision of rules.

Mattos Filho would be pleased to provide further information and clarification regarding the Resolution.

Areas of expertise

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