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Catarina Arriaga Sampaio
Senior Associate

Lawyer

Catarina Arriaga Sampaio

Languages
  • Portuguese
  • English
Social media

Catarina Arriaga Sampaio is a Senior Associate in the Corporate M&A team.

With nearly 10 years of experience, her main areas of focus are  Corporate M&A, commercial law, and capital markets.

She advises on domestic and cross-border acquisitions and disposals, the structuring of international partnerships and M&A transactions.

She also provides permanent legal advice on Corporate M&A to several national and international clients, including advice on Corporate Governance issues.

Catarina is recognised for Banking and Finance Law, Capital Markets Law, Corporate Law, Mergers and Acquisitions Law and Corporate Governance and Compliance, as Ones to Watch, by Best Lawyers for the past years.

Joined CMS Portugal in 2014.

Memberships & Roles

  • Member of the Portuguese Bar Association since 2017

Awards & Rankings

  • Best Lawyers - Ones to Watch, since 2023

Education

  • Law degree, Faculdade de Direito, Universidade de Lisboa
  • Advanced Postgraduate degree in Corporate Finance, Faculdade de Direito, Universidade de Lisboa
  • Advanced Postgraduate degree in Corporate Governance, Faculdade de Direito, Universidade de Lisboa

Insights by Catarina

Amendment to Instruction No. 23/2018 of the Bank of Portugal regarding the authorisation to exercise functions of members of the management and supervisory bodies of institutions subject to supervision by the Bank of Portugal

22 Oct 2025 4 min read

End of the bearer securities

29 Sep 2017 3 min read

New Legislation Concerning Registration of Beneficial Owner

04 Sep 2017 7 min read

Portugal: Decree-Law number 20/2016 of 20 April – Amendment to the Credit Institutions and Financial Companies’ Legal Framework

18 May 2016 2 min read
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