Partner attorney | Corporate law & litigation
Guillaume Marquis
Admitted to the Paris Bar in 2015, Guillaume Marquis advises companies, their executives, and regulated professionals on key corporate transactions and dispute resolution.
He operates both in France and on international matters.
Advisory services
Guillaume advises his clients on corporate structuring and governance, shareholder relations, acquisitions and divestitures, as well as the negotiation of commercial contracts.
He has developed a specialized practice serving healthcare stakeholders and regulated professions. He notably assists them with financing, governance, and the transfer of professional practice companies (SEL). He also advises professional bodies on issues regarding independence, oversight of practice structures, and the evolution of their professional frameworks.
Litigation & Dispute resolution
Shareholder disputes represent a significant part of his practice. Guillaume steps in when disagreements arise concerning corporate governance, shareholder rights, company valuation, or share transfers.
He seeks negotiated solutions whenever possible to protect his clients' interests, while forcefully defending them before the courts when litigation becomes necessary.
He also handles commercial contract disputes and complex financial litigation.
His cross-border cases may require coordinating multi-jurisdictional proceedings or addressing arbitration matters.
Industry sectors
Healthcare, pharmaceuticals, and regulated professions hold a central place in his activity. Guillaume also brings deep knowledge of the media, audiovisual, tourism, and real estate sectors. This industry expertise allows him to tailor both his advisory work and litigation strategy to the specific operational constraints of his clients.
A graduate of Queen Mary University of London, Université Paris II Panthéon-Assas, and Trinity College Dublin, Guillaume is also a former attendee of the Hague Academy of International Law. He works fluently in French and English.