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CMS Rui Pena & Arnaut

Part of CMS


CMS Rui Pena & Arnaut is a law firm with more than 45 years of experience, firmly established in the Portuguese market, and a member of CMS, the biggest international organization of independent law firms with the most extensive presence in Europe.

Renowned as a proficient and professional law firm, CMS Rui Pena & Arnaut builds long-term relationships with its clients based on trust and transparency. With its full-service approach, the firm provides reliable, ethical and legally correct solutions and delivers, above all, creative, competitive, proactive and efficient services to all its clients.

With its full-service approach, CMS Rui Pena & Arnaut’s client portfolio includes a large number of international clients and some of the biggest Portuguese corporate groups. The firm is leader in Energy Law and Public Law, being recognized by its know-how and large experience in the sector. In fact, the team has been involved in preparing the national legislation on natural gas, electricity and oil and in some of the most important energy infrastructure’s projects implemented in Portugal in the last years. The team is also currently being asked to provide legal assistance for innovative energy projects. RPA’s experience in this field also includes legal advice in complex public tender procedures and a large number of highly complex administrative litigation and arbitration procedures.

CMS Rui Pena & Arnaut has a wide network of well established relationships with other independent law firms in countries like Brazil (Demarest & Almeida Lawyers), Angola (Maria Manuela Cunha Lawyers) and Timor (José Manuel Gomes Guterres).     

Organisation Profile

Featured Contributors

Bernardo Cunha Ferreira João Marques Mendes Mónica Carneiro Pacheco Tiago Machado Graça



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