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Latin America Guide
Firm Profile

Leoni Siqueira Advogados

Firm Profile

Rio de Janeiro - RJ

  • Profile
  • Av. Borges de Medeiros 633, suite 508
  • Offices Shopping Leblon
  • Leblon
  • Rio de Janeiro - RJ
  • Rio de Janeiro
  • Brazil

Firm profile submitted by Leoni Siqueira Advogados

Managing Partner: Flavio Leoni Siqueira
Senior Partner: Carlos Leoni Siqueira
Partners: João Felipe Figueira de Mello, João Paulo Ferraz Vasconcellos, Felipe de Assis Torres, Maureen Ferreira-Walters, Pedro Alberto Faria

Leoni Siqueira Advogados (LSA) is a boutique law firm based in Rio de Janeiro, focused in business transactions, including the planning and structuring of M&A deals, corporate reorganisations, corporate governance strategies, commercial contracts and capital markets operations, acting in several different industries. The firm provides close and personalised services to its clients, which enables the development of sophisticated and efficient tailor-made solutions from both a legal and a business standpoint. LSA operates as a fully integrated, highly specialised team. All lawyers have vast experience in their practice areas and partners are personally involved in the coordination of the firm’s cases. LSA is led by Carlos Leoni Siqueira, who gathers extraordinary experience in business and tax laws since 1961. Carlos Leoni Siqueira has acted, almost exclusively and for a long period of time, on the Board of Directors of some of Brazil’s most important corporations such as Embraer, Usiminas, Siderúrgica de Tubarão, Cosipa, Gerdau and Bozano, actively participating in their strategic decisions. This background has enriched his legal experience with an in-depth view of the business world. This vision is shared with all members of the firm and constitutes a strong competitive advantage of LSA. Founded in 2004, LSA has participated in some of the most important M&A and corporate restructuring transactions in Brazil, involving an aggregate amount of more than R$20 billion.

Arbitration & Dispute Resolution:
The firm has experience representing clients in arbitration and dispute resolution proceedings, especially those involving corporate law issues.

Representation of interests in administrative and judicial proceedings of civil, tax, commercial real estate and contractual nature, as well as matters related to family and succession law, in all instances.

Anti-Corruption Compliance & Corporate Ethics:
Development of training programs, manuals of conduct and codes of ethics in accordance with anti-corruption rules. Analysis of internal practices and evaluation of compliance. Legal advice in investigative and internal audit procedures. Negotiations involving leniency agreements with government authorities.

Capital Markets:
LSA assists publicly-held companies and institutional investors in private and public transactions in the capital markets, including those involving securities in the primary and secondary markets, as well as public offerings. The firm structures transactions for the acquisition or sale of shares or for the floating or delisting of companies. The firm structures and counsels different investment funds in Brazil. LSA has experience representing clients in administrative proceedings before the CVM (Brazilian Securities Commission) and the CRSFN (Council of Appeals of the National Financial System).

Corporate Assistance & Counseling:
The firm assists and counsels publicly-held or private corporations and limited liability companies with respect to regular day-to-day corporate matters, coping with best practices, with special emphasis on corporations and their interface with the CVM.

Corporate Governance:
The firm in specialised in the structuring and implementation of efficient corporate governance alternatives for publicly-held and private companies, as well as for shared corporate control and in the protection of stockholders’ interests.

Corporate Finance:
LSA has experience in negotiating, structuring and implementing corporate finance transactions in the capital and financial markets, both in Brazil and abroad, for funding specific projects and/or corporate reorganisations, as well as the structuring of foreign investments in Brazil.

Corporate Reorganisations:
The firm handles corporate reorganisation deals and coordinates business optimisation strategies, assisting companies, underwriters and financial advisors.

Estate Planning & Asset Protection:
LSA has experience in structuring efficient alternatives for the protection of assets of individuals and corporations, as well as estate succession planning, both in Brazil and abroad.

The firm assists in merger and acquisition transactions of all sizes and nature, including the acquisition and sale of equity and/or assets, mergers and spin-offs of publicly-held and private companies, limited liability companies and other entities, with emphasis in negotiation, structuring, implementation and interface with regulatory agencies.

Private Equity & Venture Capital:
Structuring of private equity, venture capital, seed investments and angel investments in Brazil, through investment funds or other investment vehicles, including foreign investments.

Real Estate:
Structuring of transactions involving residential, commercial and industry real estate assets, projects and developments.

Tax Counseling:
The firm assists corporations and individuals in general tax matters and procedures in Brazil, including the management of tax liabilities, special tax assessment and payment regimes.

Tax Planning:
Structuring and implementation of tax efficient alternatives for corporate transactions, and corporate restructuring.

Tax Litigation:
Administrative and judicial tax litigation, including before the Taxpayer’s Council, CARF (Administrative Council of Tax Appeals), STJ (Superior Court of Justice), STF (Supreme Court) and all state and federal courts.

English, French, Portuguese, Spanish.

LSA represents Brazilian and foreign clients, from players in the financial sector to service providers, and participants of a large number of industries.


  • Av. Borges de Medeiros 633, suite 508 ,
  • Offices Shopping Leblon,
  • Leblon,
  • Rio de Janeiro - RJ,
  • Rio de Janeiro
  • Brazil
  • Tel +55 21 3138 6060
  • Fax +55 21 3138 6050
  • Email : [email protected]
  • Website :
  • Rua Leôncio de Carvalho 234, 4th floor,
  • Paraíso,
  • São Paulo - SP,
  • Sao Paulo
  • Brazil
  • 04003-010
  • Tel +55 11 4063 6080
  • Fax +55 21 3138 6050