Cookies on our website

We use cookies on our website. To learn more about cookies, how we use them on our site and how to change your cookie settings please view our cookie policy.

Read more Close
Skip Ribbon Commands
Skip to main content
Sign In



Contact details

Allen & Overy LLP
52 avenue Hoche

Telephone icon+33 (0)1 40 06 55 18
Send email

Download contact detailsDownload contact details View officeView office

  Marie Stoyanov



Paris-based partner Marie specialises in commercial and investment treaty arbitration. She has advised and represented clients in arbitrations throughout the world, both ad hoc and under all the major institutional rules, including the ICC, LCIA and ICSID Rules in which she has particular expertise.

Marie has substantial experience across all market sectors but her practice focuses particularly on infrastructure, energy, and natural resource disputes, with expertise in disputes arising across the African continent.

With clients that include both international investors and sovereign States, Marie regularly appears as advocate before renowned international tribunals arguing extremely complex cases, often with hundreds of millions of dollars at stake. Marie also sits as an arbitrator herself and has written and spoken regularly about international investment and arbitration.

After graduating from ESSEC, Marie studied law and was admitted to the Paris bar in 2003. As a French qualified lawyer, she is naturally used to working in all civil-law environments, in particular those whose law is directly derived from French law (e.g. Algerian law, Egyptian law, Moroccan law, UAE law).

In addition, Marie has also advised various clients on how best to structure their investment in Africa, Eastern Europe and Asia, in order to take advantage of protections offered by investment treaties and foreign investment laws.

A member of the Executive Board of the European Federation for Investment Law and Arbitration (EFILA), Marie is also an Advisory Board member of the publication Investment Claims, which is published by Oxford University Press.

* * - Arbitrage international (France, ODA 2019)

Marie was awarded the 'Leading Commercial & Investment Arbitrator of the Year 2019' for Acquisition International Magazine - France.

“She is "diligent and impressive in terms of her knowledge of the subject and of the proceedings." CHAMBERS GLOBAL 2018, DISPUTE RESOLUTION: INTERNATIONAL ARBITRATION — FRANCE


Marie was awarded the “Star of Tomorrow” distinction for International Arbitration by French newspaper Les Echos, Marie is described by Chambers & Partners as having “particular focus on investment treaty and related disputes”, in which context she is “very sharp in understanding and reaching the crux of even the most complicated issues” (Dispute Resolution: International Arbitration, France 2017).

"Marie Stoyanov is 'very sharp in understanding and reaching the crux of even the most complicated issues'." Chambers and Partners, dispute resolution: international arbitration — France 2017

"Marie Stoyanov is described as 'an outstanding, talented lawyer'." Chambers and Partners, dispute resolution: international arbitration — France 2016

Academic qualifications

PGD, International Arbitration, Queen Mary? University of London, 2003

ESSEC Business School, 1997

Published work

Sentence Micula : un tribunal condamne la Roumanie à payer 250 millions de dollars,, April 2014, written with Sebastiano Nessi

Enjeux et portée de la sentence Micula, Capital Finance, March 2014, written with Sebastiano Nessi

Interview - « Dès qu’un pays devient exportateur de capitaux, il est enclin à se porter vers l’arbitrage », Capital Finance, n° 1125, october 2013

Third-Party Funding in International Arbitration : Is it time for Some Soft Rules?, International Arbitration Review, June 2015, written with Olga Owczarek

Multiparty Proceedings and Mass Claims, The Investment Treaty Arbitration Review, April 2016, written with Jeffrey Sullivan and Lucia Raimanova

Procedural interplay between investment arbitration and criminal proceedings in the context of corruption allegations, b-Arbitra, 2018, written with Werner Eyskens, Valentin Bourgeois and Michaël Fernandez-Bertier

Find a lawyer

  • Expertise

  • Search Clear

  • Add comment (optional)