Management buyout · MBO
Managers acquire their business.
Acquisition of a signage business by members of its management team, with financial partners.
Lancier was among the buyers’ legal advisers.
Public announcement · AKORIS FinanceFrance · International
French corporate and M&A counsel for business owners, investors and international teams.

Founder & Managing Partner
Avocat · Paris Bar
Guillaume PROM THIOUNN is the founder and Managing Partner of Lancier, and a member of the Paris Bar since 2017. He advises entrepreneurs, buyers and investors on French corporate and M&A matters.
His work covers acquisitions, business transfers, capital transactions and group reorganisations, as well as the corporate matters that follow incorporation or completion.
You work directly with him. He prepares the French legal documentation, participates in negotiations and coordinates the legal steps with the other advisers involved in your matter.
He works in French and English. His academic background includes private law, Anglo-American law and a master’s degree in international and European law from Aix-Marseille University.
Our approach
We organise the work around the decisions, documents and completion steps required for your engagement.
Understand your project, review the existing documents and agree the French-law scope and fees.
Document the commercial agreement, explain open points and work with your other advisers.
Coordinate the corporate decisions, signatures and filings, and the agreed post-completion work.
Transaction experience
Management buyouts, business expansion and SME acquisitions: selected transactions in which Lancier’s role has been publicly announced.
Management buyout · MBO
Acquisition of a signage business by members of its management team, with financial partners.
Lancier was among the buyers’ legal advisers.
Public announcement · AKORIS FinanceAcquisition · Business expansion
Acquisition of a facade renovation business as part of a construction group’s expansion.
Lancier acted as legal counsel to the buyer.
Public announcement · VINCI ConseilsBusiness transfer · Entrepreneur acquisition
Transfer of a family-owned building contractor to an entrepreneur with a background in the construction sector.
Lancier acted as legal counsel to the buyer.
Public announcement · In Extenso FinanceA service from the firm
Incorporate in France helps international founders and investors set up their French company.
Company formation · International founders
French company formation for international founders and investors: choosing a structure, drafting the articles of association and coordinating registration, with guidance in English.
Visit Incorporate in FranceThe next steps for your French business