Her practice both in Portuguese and Spanish law is focused on cross border M&A, joint ventures and private equity transactions.

Mariana Norton dos Reis regularly acts for private equity investors on their investments and divestments, and represents strategic investors in connection with cross border acquisitions and sales of privately owned companies and assets.

She has recently completed a number of major transactions in the infrastructures, energy, retail, real estate and financial industry sectors in Spain and Portugal. On an international level, she has extensive experience in advising M&A transactions of multinational companies in Europe, Latin America and the United States.

She worked at the Madrid office from 2004 to 2017 and is currently based in the Lisbon office, where she started her career in 1998.

Member of the Portuguese and Madrid Bar Associations and admitted to the New York State Bar Association. She lectured in the master in Business Law, Cross Border Mergers, at Universidad Autónoma de Madrid and in the bachelor degree in Law and Business Administration and Management at Universidad CEU San Pablo, in Madrid.

Founder and coordinator of the Women in Business (WiB) program in Cuatrecasas.


  • Master in Advanced Corporate Law & Securities (named a Harlan Stone Fisk Scholar)
    Columbia Law School, New York, 1998

    Bachelor of Laws
    Universidade de Lisboa, 1997

    Executive program for Women in Business
    Esade Business & Law School, Madrid, 2016

    Received a scholarship from the Luso-American Development Foundation, 1998

Directory Mentions

Recommended lawyer
Chambers Europe, Chambers Global, Legal 500, IFLR1000, Leaders League and Best Lawyers in Corporate and M&A, Private Equity, Governance & Compliance and Energy

Tier 1
Legal 500 in Commercial, corporate and M&A

Woman Leader
IFLR1000, 2021

Iberian Lawyer, 2017 e 2018

The most active M&A lawyers by number of deals in Spain
Jornal Expansión, 2015

Forty under 40 Award
Iberian Lawyer, 2013