Mia Dassas


Mia is specialised in Financial Services & Fintech Regulatory matters. She has extensive experience in advising French and foreign credit institutions and financial institutions on the French and EU financial regulatory aspects applicable to their deals in France as well as on the organisational and conduct of business rules applicable to their activities.
Furthermore, Mia has a solid experience in licensing procedures for banks, broker-dealers, payment institutions and other financial institutions, as well as third-country branch establishments. 
Mia also has significant experience in advising French and foreign clients in M&A transactions in the financial services area, notably on the regulatory procedures and contacts with the regulators.
Mia regularly advises payment and electronic money institutions on the rules applicable to their activities, as well as on the review and negotiation of their contracts with their clients or counterparties.


Representative matters

MFEX, the Stockholm-based fund distribution platform, and Nordic Capital, on its acquisition of Axeltis, Natixis Investment Managers’ European fund distribution platform.

Caisse des Dépôts et Consignations on its acquisition of a controlling stake in Groupe La Poste/La Banque Postale and Group CNP Assurances. This is a major M&A transaction, designed to create the biggest French public bank and insurance pole.

Eurazeo on the EUR1.8bn sale to Advent International and subsequent co-control with Advent International of Planet, a major provider of integrated digital payment service.

La Banque Postale on all financial regulatory aspects of the acquisition of BPCE’s stake in CNP Assurances for EUR2.4 billion.




Published Work

  • Article: "Vers un cadre européen de la finance numérique", L’AGEFI, December 2020
  • ePublication: "French law paves the way for the digital assets services providers regulation", November 2019, Brice Henry, Mia Dassas, Pauline Robin
  • ePublication: "New French Brexit-Related Ordinance", March 2019, Brice Henry, Hervé Ekué, Mia Dassas, Clément Saudo French Brexit Law
  • bulletin: "French draft bill addresses key Brexit legal concerns", December 2018, Brice Henry, Delphine Marchand, Mia Dassas  

Speaking Engagements

  • Guest Speaker, ""Trends in Outsourcing"", AFME, 3rd Annual Compliance and Legal Conference, 3 October 2019
  • Providing training to the Senior Managers and Directors of a credit institution on their duties and highlight on CRD VI, May 2024
  • Providing training to the legal team of a French credit institution on the rules applicable to the custody of crypto-assets under the current French rules (loi Pacte) and MiCA, June 2024
  • Providing training to the legal team of an electronic money institution on the draft Payment Services Directive 3 and Payment Services Regulation, June 2024

Leadership Positions And Professional Affiliations

  • Active member for Fintech activities, Europlace since 2020 
  • Active member of the IFR/IFD implementation working group, Amafi since 2021 
  • Member of the Legal Committee on digital assets and blockchain technologies in France and Europe, ADAN since 2022 
Recognised by "Best Lawyers in France"
15th edition, 2025
Band 3
Chambers Global 2024 - (Banking & Finance: Financial Services Regulation)



Admitted to the Paris Bar, 2005

Admitted to the New York Bar, 2007


Masters of Laws (LLM), Duke University School of Law, Durham, North Carolina, 2001-2002

Doctor in Law (PhD.), University of Paris V René Descartes, Paris, 1999-2001, "A comparison of the mandatory takeover legal regimes under French, Swedish and UK law"

Post-Graduate Diploma in Law (DESS), Business Law, University Paris V René Descartes, 1998-1999


English, French, Swedish
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.