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Erwan Poisson



Poisson Erwan
Erwan Poisson



Erwan is a Partner in the Litigation department at Allen & Overy Paris. He advises international and domestic companies in complex commercial, civil, and criminal disputes, from the prelitigation stages of a matter, including alternative dispute resolution methods, to Court trials. He also covers representations before the courts of French-speaking African countries in commercial and criminal litigation matters, as well as before international courts (in particular, the ILO Administrative Tribunal).

A general litigator, Erwan notably advises in the areas of banking and finance litigation, where his experience includes liability claims against banks, financial services and investment funds; corporate litigation, including disputes between majority and minority shareholders, disputes related to shareholding agreements as well as representations and warranties.

He has also developed specific expertise in conflicts of laws and jurisdictional issues (a subject he teaches at university), international judicial assistance, asset-tracing and recovery, and the enforcement of foreign judgments and arbitral awards on assets located in France.

Erwan also handles contractual and distribution disputes as well as product liability matters and insurance disputes, with a focus on the aviation sector.

Erwan has worked in France and in the UK and he is qualified in both jurisdictions.

Leading Individual (Corporate and commercial litigation) 

"Erwan Poisson [...] highly skilled, very professional, and ultra-responsive lawyer." 

'Up and Coming'
Chambers Global/Europe 2020 - France (Litigation)

* * * * - Contentieux financier, boursier et réglementaire AMF (France, ODA 2020)

Erwan Poisson specialises in financial disputes and enforcement cases, advising both French and international clients. Clients say: "He is a connoisseur of financial institutions who is fully involved in his role in defence and in the legal argument."
Chambers Global/Europe 2020 - France (Litigation)

"Erwan Poisson is particularly active in disputes in the banking sector, including class action cases, parallel proceedings and challenging enforcements. Interviewees say: "He is very thorough, has strong and deep analytical skills and is intellectually very robust."" 
Chambers 2019 - France (Dispute Resolution: Litigation: Elite)

‘Next generation Lawyer’.
Legal 500 EMEA 2018 - (Dispute Resolution / Commercial Litigation) 

‘Erwan Poisson is ‘an excellent listener’’.
Legal 500 EMEA 2018 - (Dispute Resolution / Commercial Litigation)

“Erwan Poisson [is a] name to note” 
Legal 500 EMEA 2017 - (Dispute Resolution / Commercial Litigation) 

News & insights

News: 24 SEPTEMBER 2020

ICBC issues offshore Additional Tier 1 preference shares

Allen & Overy has advised the joint bookrunners and joint lead managers on the issuance of USD2.9 billion 3.58% non-cumulative perpetual offshore preference shares by Industrial and Commercial Bank of…

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shopping bags

News: 22 SEPTEMBER 2020

Shopping centre specialist ECE relies on Allen & Overy for debut bond issue

Allen & Overy has advised ECE Real Estate Partners, the fund management company of Hamburg-based commercial property specialist ECE, on the issuance of an innovative real estate bond.

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A metal staircase against a white concrete wall

Publications: 22 SEPTEMBER 2020

The European Commission’s evaluation of the antitrust rules on vertical agreements: where are we heading?

The European Commission’s evaluation of the Vertical Block Exemption Regulation and the Vertical Guidelines has shown that, whilst these tools continue to serve a useful purpose, there is room for…

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Publications: 30 MARCH 2020

Covid-19 coronavirus - force majeure, imprévision/hardship and emergency legislation on contracts under French law in light of the Covid-19 pandemic

The Covid-19 pandemic and its consequences are having a major and sudden impact on economic activities and in particular the conditions in which contracts are being performed.

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Allen & Overy LLP
52 avenue Hoche
75008 Paris

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Solicitor of England and Wales, 2007

Admitted to the Bar, Paris, 2002


Master's degree, Private international law, University of Paris I Panthéon Sorbonne, 1999-2000

Master's degree, Dispute resolution, University of Paris II Panthéon-Assas, 1998-1999

Magister Juris (LL.M), Oxford University, 1997-1998

Degree in International and EU law, University of Paris II (Panthéon-Assas), 1996-1997

Published work

  • Trois questions à Denis Chemla, Erwan Poisson, Michael Young, Option Droit & Affaires, May 2013
  • The validity of one-way jurisdiction clauses put at risk by the French Supreme Court, PLC Dispute Resolution, November 2012 (co-written with Denis Chemla, Camille Fléchet)
  • Mauvais arrangement vaut mieux que bon procès, La Lettre des Juristes d'Affaire, February  2012, co-written with Augustin Doulcet