Marc Castagnede


Marc specialises in mergers and acquisitions as well as private equity for listed and not-listed companies, financial institutions and investment funds.

Marc is a recognised practitioner by best lawyers since 2010 in banking and finance law, capital Markets law and mergers and acquisitions law with a specific focus on equity.

Published Work

  • Faut-il imposer un seuil de renonciation dans les offres publiques volontaires, Revue Trimestrielle de Droit Financier, March 2011 
  • Bidders, Expect Regulatory Action, International Financial Law Review, p. 27 and seq., September 2008
  • Programmes de Rachat : Légitimité ou Suspicion ?, Les Echos, 12 December 2004
  • PPP's in France: At a Turning Point, Privatisation & Public Private Partnership Review 2004/2005, 1 June 2004
Marc Castagnède is a very good lawyer. He is constructive and a deal maker
Chambers Global 2024 - (Corporate / M&A High-end capability)
Marc Castagnède is extremely committed to the deal and to the customer. He is very available and he is not the type of partner who is away from the deal. He is on the ball, does the drafting and is very involved, which makes us feel very comfortable
Chambers Global 2024 - (Corporate / M&A High-end capability)


  • Band 2, Chambers Global 2024 - (Corporate / M&A High-end capability)
  • Band 2, Chambers Global/Europe 2023 - France (Corporate / M&A)
  • Band 2, Chambers Global/Europe 2022 - France (Corporate / M&A)
  • Leading Individual, Legal 500 EMEA 2023 - France (M&A)
  • Leading Individual, Legal 500 EMEA 2022 - France (M&A)
  • Highly regarded, IFLR 1000 2021 - France (Capital Markets: Equity, M&A, Private Equity)



Admitted to the Bar, Paris, 1996


LLM, Harvard Law School, 1994

Post Graduate Degree, Business and Economic Law, University of Paris I, 1991

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.