Mathieu Vignon


Matthieu is Regional Head of Tax.
He focuses primarily on advising on the tax aspects of structuring and executing mergers and acquisitions, internal restructurings, cross-border financings, investment funds and debt restructurings.
He also has significant experience advising on tax aspects of financial instruments, derivatives, fund structures, real estate, asset finance and leveraged finance transactions.
Mathieu is a recognised practitioner by "Best Lawyers" since 2014 in Tax Law.

Published Work

  • Restructuration financière des groupes en période de crise: quelques réflexions fiscales, Les Nouvelles Fiscales N°1049, 1 July 2010, co-authored with David Affejee
  • Islamic bonds (sukuks), vers une solution française?, Revue trimestrielle de droit financier, May 2009, co-authored with Romain Pichot
  • Régime fiscal des opérations de titrisation: doutes et certitudes du cédant, Nouvelles Fiscales, September 2008, co-authored with Romain Pichot et Viviane Carpentier
  • Les nouvelles perspectives des GIE fiscaux, RTDF, June 2008, co-authored with David Affejee

Speaking Engagements

  • Taxation of European and US Cross-Border Financial Products, 11/06/2009
  • Mardis de l'Hôtel de Beauvais on Les paradis fiscaux sont-ils un mal inévitable ?with Jeffrey Owens (Director Centre for Tax Policy and Administration OECD), 13/10/2009
  • Séminaire Retournement, 04/06/2009
  • Actualités des financements structurés, 30/09/2008

Leadership Positions And Professional Affiliations

  • New York State Bar Association, Tax Section
  • American Bar Association
He is quick and explains complex issues simply
Chambers Global/Europe, Tax, France, 2023
Mathieu Vignon regularly assists financial institutions and corporates with tax advice in connection to acquisitions and debt restructurings. "Mathieu Vignon is extremely knowledgeable in tax matters and is able to succinctly describe the issues to non-tax professionals, explains one source, adding further: "He is very commercial and proactive in identifying issues and finding solutions"
Chambers Global/Europe, Tax, France, 2022


  • Band 3, Chambers Global/Europe 2023 - France (Tax)
  • Leading Individual (Transactional / Corporate Tax), Legal 500 2023 - France (Tax)
  • Band 3, Chambers Global/Europe 2022 - France (Tax)
  • Leading Individual (Transactional / Corporate Tax), Legal 500 2022 - France (Tax)
  • Chambers Europe 2018 – France: Tax 
  • Recognised practitioner, Legal 500, 2018



Admitted to the Bar, New York, 2000

Admitted to the Bar, Paris, 1998


LL.M, International Taxation, New York University, 1999

Post Graduate Degree, Business and Tax Law, University of Paris I, Panthéon Sorbonne, 1996


English, French
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.