Arendt Appoints New Co-Chairs, Re-Rlects Managing Partner

On Wednesday 25 March 2026, Arendt announced a renewed senior leadership team that will take office on 1 April for a three-year term.

Gilles Dusemon and Thierry Lesage will serve as Co-Chairs of Arendt, while Jean-Marc Ueberecken has been re-elected as Managing Partner. Gilles and Thierry succeed Michèle Eisenhuth and Claude Niedner. Claude will remain a Partner and will leverage his professional lawyer experience to support the Arendt Regulatory team, while Michèle will retire from her Partner role and focus on new personal projects.

Arendt said this new chapter was defined by "continuity, shared values and unwavering ambition". The firm's goal is to reaffirm presence in the Luxembourg market while accelerating its growth across Europe.

"This next chapter reflects both who we are and where we are going: a firm with strong values, clear ambition and full confidence in our ability to continue contributing positively to Luxembourg's financial centre and supporting Europe's evolving regulatory environment. Collaborating with Thierry and Gilles as they take on their Co‑Chair roles ensures strong continuity between our strategic vision and its implementation," commented Jean-Marc Ueberecken.

As previously announced, Arendt and BlackFin Capital Partners have entered into a partnership to support the international expansion of Arendt Investor Services (AIS), with BlackFin becoming the majority shareholder while Arendt retains a significant stake. The firm said this transaction "reinforces Arendt's long-term vision, further enhances the firm's multidisciplinary model and positions AIS to accelerate its growth across Europe by combining BlackFin's operational expertise with Arendt's regulatory, legal, tax and advisory capabilities."

Arendt reported that its "competitive strength lies in the breadth and depth of its expertise", covering legal, tax, regulatory, advisory and investor services. The firm employs more than 1,250 professionals across its entities, which collectively recorded a total revenue of €345 million - up 6% year-on-year.

"Our multidisciplinary model is more than a set-up, it is a strategic asset for our clients. By bringing together an unparalleled range of expertise, we deliver solutions that are both pragmatic and future- proof, designed to support clients through complexity, regulation and transformation. Working alongside Gilles in this new role is a privilege, and I look forward to the shared responsibility of guiding the firm forward," said Thierry Lesage.

Arendt added that innovation and technology have become "central pillars" of its strategy. The firm continues to invest in artificial intelligence (AI) adoption, digitalisation and new service models, aimed at enhancing service quality by "improving efficiency, transparency and the ability to anticipate clients’ needs"

"Innovation is not a separate initiative, it is part of our everyday work. Our responsibility is to translate strategy into concrete tools and processes that enhance the way we serve clients. With AI and technology, we are accelerating what we have already started: creating new ways of working where people and innovation reinforce one another," explained Jean-Marc Ueberecken.

Arendt noted that it engages in regular dialogue with clients, policymakers and "leading voices" inside and outside Luxembourg's financial community "to help drive the industry forward". The firm also collaborates with the University of Luxembourg, notably through its contribution to the Master's in Investment Funds Law.

"Our firm has grown with Luxembourg, and our commitment to its ecosystem is stronger than ever. We play an active role in the financial centre and have a responsibility towards our people, our clients and the community. The impact we have today must help shape the Luxembourg of tomorrow. Co-chairing Arendt with Thierry is an honour, and together we are committed to strengthening the firm's mission and long-term vision," stated Gilles Dusemon.