We are proud to announce that we have been recognized in Décideurs’ 2026 rankings:
Construction:
This is a wonderful recognition of our teams’ expertise and commitment to serving our clients.
Link to our rankings: https://www.leadersleague.com/fr/firm/alerion
In M&A and private equity transactions, just as in preparing for a marathon, success depends on discipline, perseverance, and the ability to stay the course until the finish line.
In an interview with Décideurs Corporate Finance, our partner Karine Khau-Castelle, who specializes in corporate law, M&A, and private equity, shares the parallels she draws between her passion for running and her work as a lawyer. An inspiring story that illustrates how the qualities developed through sports can also be valuable assets in supporting our clients.
📖 Read her interview: Read the article
At the international France Quantum 2026 trade show, Frédéric Saffroy delivered the Master Class entitled “Quantum Technologies: Securing the Value Chain” at Station F.
Against the backdrop of the expanding scope of export controls and their use for political purposes, how can quantum industry players protect themselves from extraterritorial effects in order to retain control over their supply chain? To present the applicable constraints and possible solutions, including the use of Open Source, Frédéric Saffroy was joined by Marion Faure, Patent Attorney (BCF), and Benjamin Jean, founder of Inno3 and Open Source specialist.
Alerion has once again been recognized as one of the top law firms in France in the 2026 edition of the Lawyers’ Rankings compiled by Le Point and Statista.
We are proud to be recognized this year, particularly in the areas of Private Equity and Venture Capital.
👏A big thank you to our clients and congratulations to our teams: Pierre-Olivier Brouard, Christophe Gerschel, Karine Khau-Castelle, Vincent Poirier, and Antoine Rousseau.
Article details: https://www.lepoint.fr/societe/palmares-des-avocats-du-point-tous-les-resultats-de-ledition-2026-N5UO5HC2NRBH5LODNZW2DHTX7A/
Alerion Avocats is proud to announce its rankings by The Legal 500 across several key practice areas, once again confirming the recognition of the quality of its legal support and the commitment of its teams.
The firm is ranked in nine practice areas, with the following results:
For the first year, we are proud to be recognised in the “Firms to Watch” category, a distinction that highlights the quality of our support and the expertise developed by our teams in Banking and Finance: transactional work.
We would like to warmly thank our clients for their continued trust, as well as all our teams for their daily commitment.
Jacques Bouyssou, Marie-Hélène Bartoli Vallet, Constance Benoist, Luana Nilsen, and Loïc Saint-Martin from the Litigation, Arbitration and White-Collar Crime Department of the law firm Alerion Avocats have authored their semi-annual review of French case law in arbitration law in the latest issue of La Ley Mediación y Arbitraje.
This leading journal is dedicated to the regulatory, case law and practical developments in alternative dispute resolution mechanisms — both nationally and internationally.
Thank you for your trust, José Carlos Fernández Rozas.
For more information: https://fernandezrozas.com/2026/01/19/la-ley-mediacion-y-arbitraje-no-25-octubre-diciembre-2025/
As labor and employment law lawyer, Florence Coussau advises French and international companies, including listed and unlisted groups, SMEs, and start-ups, both in advisory matters and in litigation.
She assists clients in restructuring operations, mergers and acquisitions, business transfers, collective redundancies, and international mobility. She also supports her clients in addressing individual and collective employment relations, as well as in ensuring legal compliance and managing legal risks in employment law and social security law.
She is a graduate of King’s College London and Paris I Panthéon–Sorbonne (LLB in English Law and Master’s in Private Law, 2001), and holds a DEA in Business Law and a DES in Economic Law (UCL – Louvain‑la‑Neuve & Paris I Panthéon‑Sorbonne, 2002)
She began her career at the firm Flichy Grangé Avocats in 2004, then joined Jones Day in 2006. Before joining Alerion, Florence was a partner at Kalliopé law firm since 2021.
Welcome to Florence Coussau!
Maître Nicola Kömpf and Maître Jörg Letschert, Co-Chairs of the Legal Commission, together with the entire Bureau of the Commission, are pleased to invite you to the next meeting of the Legal Commission:
Monday, November 17, 2025, at 6:30 p.m.
Venue: Alerion Avocats – 137 rue de l’Université, 75007 Paris
Meeting Theme: Franco-German Projects in Aerospace & Defence: The Pitfalls of Export Control
Cooperation projects in the aerospace, space, and defense sectors often involve goods and technologies classified as dual-use items or military equipment.
Following an overview of the applicable regulations—including the tripartite France–Germany–Spain agreement on the export of military materials—we will discuss concrete case studies to illustrate their implementation and identify potential pitfalls to avoid.
Speakers:
Hybrid Attendance: The event will be held both in person and online via Microsoft Teams.
Registration required by November 14, 2025:
https://www.francoallemand.com/fr/Evenements/droit-fiscalite-et-rh/commission-juridique-de-la-cfaci
(Without prior registration, the Teams link cannot be provided.)
Alerion Avocats participated in the IBA Annual Conference held in Toronto from 2 to 7 October, alongside a delegation of five partners representing the firm’s wide-ranging expertise and strong international orientation:
• Jacques Bouyssou, Partner – Litigation, Arbitration, White-collar Crime
• Pierre-Olivier Brouard, Partner – M&A, Private Equity
• Nicola KÖMPF, Partner – German Desk
• Jérémie Mancel Cottrel, Partner – Tax Law
• Antoine Rousseau, Partner – M&A, Private Equity
This event provided a key platform for reinforcing our longstanding relationships with leading international partner firms and establishing new strategic alliances. As trusted advisors to our clients, we support them in their global development and operations.
The conference also offered a valuable opportunity to enhance our knowledge, benchmark our practices at the highest international level, and ensure we continue to deliver excellence across borders.
We are also proud that Jacques Bouyssou has been appointed Chair of the Litigation Committee. In this capacity, he will lead throughout 2026 a community of more than 3,000 litigation lawyers worldwide.
Our latest International Newsletter explores major cross-border legal developments shaping corporate, compliance, and business law in France and Europe.
Discover these insights and more in our full newsletter.