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Managing Partner

Olivier Marquet

Languages
  • French
  • English
Social media

Olivier Marquet is the Managing Partner of CMS Monaco and one of its founding partners. He heads the Banking & Finance team. Olivier is an Avocat Défenseur at the Monaco Bar.

Repeatedly recognised as a leading practitioner by prestigious international rankings, Olivier brings over 20 years of experience, advising a wide range of Monegasque and foreign clients, mostly banks and financial institutions.

His expertise includes all types of regulatory issues, financial products, and transactions. He assists his clients in, amongst others, the creation or acquisition of a bank or financial institution, banking monopoly, bank secrecy, Franco-Monegasque banking agreements and also monetary agreements between the Principality of Monaco and the European Union. He also advises his clients on the SEPA agreement, measures to combat money laundering, terrorist financing and corruption, Monegasque financial law, Monegasque banking laws, banker's liability law, laws on credit and syndicated loans, credit guarantees, debt restructuring and the preparation of documents for clients to exercise banking and financial activities. His expertise also covers data protection law.

Olivier has a strong track record in contentious matters, and regularly represents banks and financial institutions, and their executives, in litigation before the Monegasque courts. He is also a highly experienced criminal lawyer.

Olivier’s expertise is widely acknowledged by his clients and independent rankings, such as Chambers & Partners, Legal 500 or Who’s Who Legal.

Awards & Recognitions
01 –
  • Quote
    Olivier is an excellent lawyer with excellent listening skills and is constantly looking for effective solutions.
    Chambers & Partners 2026 : General Business Law (Monaco)
  • Quote
    He takes the time to fully understand his client's issues and creates a strong climate of trust.
    Chambers & Partners 2026 : General Business Law (Monaco)
  • Quote
    The main qualities of Olivier Marquet are his reactivity, listening skills and pragmatism.
    Chambers & Partners 2025 : General Business Law (Monaco)
  • Quote
    Olivier Marquet is an outstanding lawyer. His knowledge and his drive to understand and cover the relevant subjects in great depth are among the best I have seen in my long career in the industry.
    Chambers & Partners 2025 : General Business Law (Monaco)
  • Quote
    Olivier Marquet is a very competent lawyer with extensive knowledge in many fields. He is always available and supportive and provides very close follow-up of the issues.
    Chambers & Partners 2024 : General Business Law (Monaco)
  • Quote
    Olivier Marquet is extremely competent, serious and reliable in his approach to his work.
    Chambers & Partners 2024 : General Business Law (Monaco)
  • Quote
    He is a lawyer with an outstanding legal mind. It is a real pleasure working with Olivier, he is very reactive.
    Chambers & Partners 2023 : General Business Law (Monaco)
  • Quote
    Partner Olivier Marquet is highly sought after for banking and finance.
    Legal 500 EMEA 2022 : Commercial, Corporate and M&A (Monaco)
  • Quote
    Olivier Marquet frequently advises clients from the banking industry on a range of matters, including contentious mandates and internal reorganisations. He also assists corporate clients with cryptocurrency fund-raising, as well as representing defendants in white-collar crime litigation.
    Chambers & Partners 2022 : General Business Law (Monaco)
  • Quote
    Olivier Marquet is the paramount choice for commercial law. Olivier has been advising our firm for years, his strategic thinking and his legal abstraction capabilities helped us to find the most efficient structures and to solve many legal conflicts in and out of court.
    Legal 500 EMEA 2021 : Commercial, Corporate and M&A (Monaco)
  • Quote
    Olivier Marquet with CMS “has a very large panel of knowledge, which allows him to be very efficient on different matters”. One client effuses that “thanks to his strong experience and efficiency, we always have a good chance to win”.
    Who's Who Legal 2021 : Banking: Finance (Monaco)
  • Quote
    Olivier Marquet has a strong focus on financial law matters, advising clients on bank guarantees and real estate financing, as well as representing financial sector clients in litigation.
    Chambers & Partners 2021 : General Business Law (Monaco)
  • Quote
    Olivier Marquet represents private individuals and companies in disputes, as well as advising on real estate financing, market exits and corporate restructurings. Interviewees particularly highlight Marquet for his activity in the banking sector.
    Chambers & Partners 2020 : Corporate/Commercial and Dispute Resolution (Monaco)
  • Quote
    Olivier Marquet is a standout name for banking matters, renowned for his profound knowledge of the foundation of banks and financial institutions, as well as bank secrecy matters.
    Who's Who Legal 2020 : Banking: Finance (Monaco)

Publications

  • Banques : ouvrir un compte à Monaco, un parcours sous conditions, TV Monaco (2026)
  • Conférence UFE : la fiscalité des Français à Monaco, Monaco Info (2026)
  • Français de Monaco : bien connaître la fiscalité franco-monégasque, La Gazette de Monaco (2026)
  • Negotiated justice is expected to arrive in Monaco shortly in the form on a criminal settlement mechanism, Monaco Economie (2026)
  • CMS Monaco: le partenariat juridique stratégique en Principauté, Forbes (2025)
  • Thomson Reuters Regulatory Intelligence: Anti Money Laudering in Monaco (2025)
  • Real estate enforcement and valuation, Monaco Economie (2025)
  • "La place monégasque est petite, mais ses dossiers sont d'une qualité exceptionnelle", Décideurs Magazine (2024)
  • Thomson Reuters Regulatory Intelligence Guide: Insurance in Monaco (2024)
  • Lending and Secured Finance, Lexology (2024)
  • Interview with Olivier Marquet and Stephan Pastor, Managing Partners, Legal 500 (2024)
  • Bank fraud on the rise: customers are responsible for keeping their bank details secret, Monaco Economie (2024)
  • Thomson Reuters Regulatory Intelligence Guide: Securities & Banking in Monaco (2023 - 2024)
  • The Legal 500 Banking & Finance Guide - Monaco chapter (2020 - 2024)
  • The CERC: This is the end..., Monaco for Finance (2023)
  • Interview with the Managing Partners, The Legal 500 (2023)
  • Thomson Reuters Regulatory Intelligence Guide: Anti-Money Laudering in Monaco (2023)
  • Thomson Reuters Regulatory Intelligence Guide: Insurance in Monaco (2023)
  • What are the consequences of the new rules on financial canvassing?, Monaco Economie (2023)
  • The Law Reviews: The Lending and Secured Finance Review - Monaco chapter (2021 - 2023)
  • Changes to disciplinary administrative procedures in Monaco: rights of the defence gradually enhanced, Monaco for Finance (2022)
  • Getting the Deal Through: Banking Regulation - Monaco chapter (2018 - 2022)
  • Getting the Deal Through: Private Banking & Wealth Management - Monaco chapter (2017 - 2022)
  • Reform of the regulation of financial activities: Monaco holds its place, Monaco for Finance (2021)
  • Getting the Deal Through: Securities Finance - Monaco chapter (2019 - 2021)
  • Monaco - Data Protection in the Financial Sector, DataGuidance by OneTrust (2019, 2021)
  • Informed client or uninitiated client: legal criteria for distinguishing between the two, Banking & Finance - Monaco (2019 - 2020)
  • M&A in Monaco, Global Practice Guide, Chambers and Partners (2019)
  • ICOs: an innovative unidentified object for European regulators?, Banking & Finance - Monaco (2018 - 2019)
  • Disputes when exchanging tax information based on a bilateral agreement, Banking & Finance - Monaco (2018 - 2019)
  • Article L.511-33 of the Monetary and Financial Code no longer holds any secrets for the Court of Revision, Banking & Finance - Monaco (2017 - 2018)
  • A Monaco, as elsewhere, fishing (for information) is forbidden, Banking & Finance - Monaco (2017 - 2018)
  • Electronic signature: is it time to let ink go?, Banking & Finance - Monaco (2016 - 2017)
  • Compliance, the territorial principle and the legally binding nature of contracts, Banking & Finance - Monaco (2016 - 2017)
  • The status of company director, Actions Simplifiées
  • Co-editor of Editions Lexis Nexis-Jurisclasseur, Fascicules de droit monégasque
  • Justice : information, vigilance, supervision, guidance – what obligations must Monaco’s depositary banks meet?, Banking & Finance - Monaco (2015 - 2016) 

Memberships & Roles

  • Participant at the Modernisation Committee of the Business Law in Monaco
  • Accredited Advisor of "Monaco Private Label"

Education

  • Monaco Bar (2005)
  • Visiting Scholar, Duke University - School of Law (US)
  • Postgraduate Degree in Business Law, University of Nice
  • Postgraduate Degree in International Business Law, Aix-Marseille University

Insights by Olivier

Intervention for the "Magistère Juriste d'Affaires" - University of Paris II

Intervention for the "Magistère Juriste d'Affaires" - University of Paris II

10 Oct 2025
CMS Monaco x Forbes : Les Entreprises à Succès

CMS Monaco x Forbes : Les Entreprises à Succès

08 Oct 2025 1 min read
Coralie Trudon promoted to Counsel

Coralie Trudon promoted to Counsel

14 Jul 2025 1 min read
CMS Global Partner Summit 2025

CMS Global Partner Summit 2025

21 May 2025 - 23 May 2025
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