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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.

* * * * - Contentieux financier, boursier et réglementaire AMF (France, ODA 2019)

"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 & PARTNERS 2019 - France (Dispute Resolution: Litigation: Elite)


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

Key regulatory topics

Publications: 22 JANUARY 2020

Key Regulatory Topics: Weekly Update 10 January - 16 January 2020

Allen & Overy publish weekly updates on key regulatory topics affecting the financial services sector. 

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Publications: 20 JANUARY 2020

Inactive entities are about to be removed from the Luxembourg trade and companies register

Following the statement issued by the Luxembourg Ministry of Justice in December 2019[1] , the Luxembourg Business Registers (LBR) confirmed on 13 January 2020 that it will start removing inactive entities from the Luxembourg trade and companies register. 

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Singapore Legal Update - January 2020

Publications: 20 JANUARY 2020

MAS consultations on the regulation of digital payment tokens

The Monetary Authority of Singapore (MAS) has issued three new consultations each dealing with different aspects of the regulation of digital payment tokens (DPTs) under the Payment Services Act (PSA). It has also recently clarified that where a DPT may be characterized as either a debenture or as e-money, its policy approach will be to regulate it as e-money. Note that the PSA will come into force on 28 January 2020.

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Singapore company wound up in the U.S not allowed to block enforcement of charge over its shares

Publications: 20 JANUARY 2020

Singapore company wound up in the U.S not allowed to block enforcement of charge over its shares

In a recent case, the High Court had to consider whether to apply a moratorium to the enforcement of a share charge taken over the shares in a Singapore company where that company was subject to insolvency proceedings in the United States. It held that it had no basis to do so under section 259 of the Companies Act which renders void a transfer of shares in company made after the commencement of a winding up by the Singapore Court as that section did not apply to a foreign proceedings.

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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