Antoine Martiarena

Antoine Martiarena is an investment professional at UNEXO, the Crédit Agricole-backed investment fund focused on entrepreneurs and businesses in France’s Grand Ouest. UNEXO’s own team page lists him in the front-office investment team for Bretagne, and recent UNEXO materials identify him as a “Directeur de participations Bretagne.”

He joined UNEXO in January 2016 as a financial analyst based in Rennes. UNEXO’s 2016 announcement said he was 28 at the time, graduated from EDHEC Business School in Lille, joined Mazars Paris in 2012, and then moved to Mazars Rennes as a senior financial auditor before joining UNEXO.

In November 2020, UNEXO announced that Martiarena had been promoted from financial analyst to chargé d’affaires in Rennes. The announcement said he would handle co-investment transactions with other Crédit Agricole investment structures and would continue follow-up work on portfolio companies where he had been closely involved since joining.

His public deal record since then is concentrated in UNEXO’s capital-investment and capital-transmission activity in Bretagne and nearby Grand Ouest markets. He has appeared on UNEXO investment teams for ABE, Delta Dore, Squiban, GPG Granit / Seiven, Groupe Josso, Gaïago, Groupe Vidon, and La Compagnie du Catamaran / Fountaine-Pajot.

• UNEXO invests as a minority shareholder in Grand Ouest companies pursuing development, ownership transfer, or capital reorganization, with a stated long-term approach alongside management.
• The firm’s capital-investment criteria are PME and ETI businesses in the Grand Ouest, from €5 million of revenue, with tickets from €0.3 million to more than €10 million, in equity and/or bonds, alone or with co-investors.
• UNEXO states that it invests across sectors except Crédit Agricole excluded sectors, so Martiarena’s sector pattern appears to be regional and company-specific rather than narrow vertical specialization.
• In the Squiban transaction, Martiarena said UNEXO was attracted by a progressive management transmission that kept the group rooted in its territory, and by Squiban’s relevance to food sovereignty and the energy transition.
• In the Seiven follow-on investment, Martiarena highlighted the CEO’s trajectory since 2022, the development project, and the choice to associate employees with the company’s capital.
• In Groupe Vidon, Martiarena emphasized supporting the founder’s growth strategy and enabling key managers to enter the capital, pointing to a preference for transactions where financial structuring, succession, and management alignment are central.