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Siqueira Castro – Advogados

Work +55 11 3704 9840

Guilherme Dantas

Work +55 11 3704-9840
Siqueira Castro – Advogados

Work Department

São Paulo Office



Areas of activity
• Corporate Law
• Mergers and Acquisitions
• Contracts
• Private International Law
• Commercial Law
• Competition Law
• Banking Law
• Telecommunications
• Civil Law
• Court-Supervised Reorganization and Bankruptcy
• Media and Entertainment Law
• Third Sector


• Parner with Siqueira Castro – Advogados
• Founder and Partner of Dantas, Lee, Brock & Camargo Advogados.
• Partner with Manhães Moreira Advogados
• Consultant with KPMG
• Legal representative, board of directors member and executive of various Brazilian subsidiaries of multinationals, in particular in the technology sector
• Board member of third-sector entities in the areas of education and culture
• Former visiting professor at UniSantana – Tax law
• Former visiting professor at UniSantana – Foreign trade law
• Teaching assistant in constitutional law at PUC-Campinas
• Teaching assistant in procedural law at PUC-CAmpinas


Portuguese, English, Spanish and German.


• Member of the Brazilian Bar Association, São Paulo State Chapter
• Member of the Brazilian Bar Association, Rio de Janeiro State Chapter
• Member of the Association of Lawyers of São Paulo – AASP
• Member of the International Bar Association – IBA
• Representative of Brazil with the Association of International Tax Consultants - AITC
• Former Board Member of the AITC
• Former Board Member of Avrio Avocati


• Law Degree from Pontifical Catholic University of Campinas (PUC-Camp) Law School, in 1996
• Postgraduate specialization in telecommunications law from Getulio Vargas Foundation (FGV/SP)
• Postgraduate specialization in economic law from Getulio Vargas Foundation (FGV/SP)


Bankruptcy and restructuring

Within: Bankruptcy and restructuring

Siqueira Castro – Advogados has expertise in debt recovery, debt renegotiation and other bankruptcy-related matters. Carlos Fernando Siqueira Castro and Guilherme Dantas head the practice.

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Competition and antitrust

Within: Competition and antitrust

Siqueira Castro – Advogados is set apart by its extensive office network throughout Brazil and also the breadth of its client base, which includes leading players – both domestic and international – in a multitude of sectors. Its antitrust department had a busy year in 2017, with clients engaging it in a range of high-profile investigations and litigation. In one highlight, the team represented a Japanese client before CADE in the negotiation of a penalty and cease-and-desist agreement which settled an administrative procedure. Guilherme Dantas and Heitor Faro de Castro are the names to note.

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Corporate and M&A (including ‘compliance’)

Within: Corporate and M&A (including ‘compliance’)

With an extensive office network in Brazil, Siqueira Castro – Advogados has lawyers based in key cities across the country. The team is also active in cross-border transactions and maintains relationships with numerous foreign law firms. The firm’s busy compliance team is led by João Daniel Rassi and Fernando Villela de Andrade Vianna, and advises on foreign and national legislation. Carlos Fernando Siqueira Castro, Fábio Korenblum and Guilherme Dantas are advising a client in the energy generation field on commercial agreements, corporate governance and compliance policies. Sérgio Ricardo Fogolin is another name to note.

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International trade and customs

Within: International trade and customs

The multidisciplinary team at Siqueira Castro – Advogados draws on expertise in customs, tax, IP, and corporate/M&A. Maucir Fregonesi and Guilherme Dantas are the key contacts.

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