Grégoire Mangeat

Practice Areas

Financial Crime and Investigations, Dispute Resolution, Arbitration.

Grégoire regularly acts in high-profile multijurisdictional cases and represents Swiss and foreign clients in criminal and mutual legal assistance proceedings, and in the delisting of people or entities from sanction lists. He has developed invaluable expertise in the banking and financial services, energy and health sectors.

Selected cases include:

• Representing a foreign national entity responsible for electricity production and supply of electricity to act in proceedings comments it before Geneva courts by a Swiss bank and a foreign oil trading company claiming USD 15 M. for the delivery of heavy fuel.

• Representing a foreign client accused of money laundering and corruption of foreign public officials, and assisting him in relation to the freezing by the Swiss Office of the Attorney General of his assets amounting to CHF 4.5 M.

• Representing a foreign sovereign fund after Swiss claimant company has obtained an attachment over CHF 11 M. deposited in its Swiss accounts in relation to an alleged debt owed by another foreign entity.

• Representing Geneva and Swiss public entities against a former executive employee accused of forgery of a document and fraud for around CHF 1.7 M.

• Representing a client in the extradition proceeding — after his arrest during a dawn raid in a hotel in Zurich — related to a major scandal in 2015 concerning one of the biggest sport association in the world, in which our client is accused of bribery of private persons for several millions.

• Representing a close relative of the present leader of a Central Asian State suspected to have received bribes in the context of a major international bribery scandal covering the UK, Sweden, Germany, Switzerland and France, following which CHF 800 M. deposited in Swiss banks have been attached by the Swiss General Prosecutor.

Career

Grégoire has over 20 years' experience as a seasoned and hands-on litigator with a strong focus on white-collar crime. His main practice areas are Litigation, Arbitration and White Collar Crime and Investigations.

He specialises in assisting and representing clients in Swiss and International proceedings, enforcing and defending against claims and taking preliminary measures (seizing of properties, obtaining bans, prohibiting media releases etc.).

He is a member of the European Criminal Bar Association (ECBA) and a member of the European Fraud and Compliance Lawyers (ECFL).

He has proven experience in gathering preliminary evidence, representing clients in white-collar crime, extradition, inheritance or bankruptcy proceedings. He also specialises in the delisting of people or entities from sanction lists and in legal and administrative assistance (tax, criminal and financial matters) and has appeared in several cross-border and multi-jurisdictional proceedings.

Grégoire served as Chairman of the Human Rights Commission of the Geneva Bar Association (ODA).

Prior to founding Mangeat Attorneys at Law, Grégoire was partner at Eversheds in Geneva and a partner at MCP Avocats, Geneva, before that.

He is a lecturer at the University of Geneva (ECAV) and has been teaching litigation skills since 2011.

Publications

Loi fédérale sur les marchés publics et attribution d’un mandat par les organisations de cautionnement dans le cadre des cautionnements solidaires liés au COVID – 19 : enjeux juridiques, Grégoire Mangeat, Flavia Bianchi, 2026

L’état de droit et des avocats à l’épreuve des sanctions contre la Russie, Sandrine Giroud,

Grégoire Mangeat, Berem Brun, Revue de l’Avocat, 2/2023, p. 63 ss.

Sanctions et secret professionnel de l’avocat, Sandrine Giroud, Grégoire Mangeat,

RSJ 24/2022, p.1224 ss.

Deferred Prosecution Agreements: une valeur probante sujette à caution, Grégoire Mangeat, Fanny Margairaz, in “Revue Internationale de la Compliance et de l’Éthique des affaires”, fév. 2022, p.12 ss.

Swiss Contribution in “White Collar Crime - Chambers & Partners Global Practice Guide”,

Grégoire Mangeat, Fanny Margairaz (2019–2023)

Swiss Contribution in “The Anti-Bribery and Anti-Corruption Review”, Grégoire Mangeat, Hadrien Mangeat, in The Law Review (2020 - 2023)

“ICLG — Class & Group Actions 2015”, Grégoire Mangeat, Peter Haas (10.2015)

Swiss Contribution in “Global Legal Insights — Bribery & Corruption”, Grégoire Mangeat,

Fanny Margairaz (11.2013)

“Anti-doping and Competition Law”, Grégoire Mangeat, Fabien Aepli, in ELR (09.2006)