Europe
Practice Areas
Nicolas Thieltgen is Managing Partner of the firm and heads the Banking & Finance and Dispute Resolution departments. He advises domestic and international clients on complex disputes, regulatory matters and strategic financial issues involving significant operational and reputational stakes.
His dispute resolution practice covers civil, commercial and administrative litigation, shareholder conflicts, directors’ liability, banking and financial litigation, as well as white-collar crime proceedings. He is particularly recognised for handling high-stakes and sensitive disputes requiring strategic positioning and procedural precision.
In parallel, he provides regulatory and banking advisory services, notably in crisis situations, restructuring contexts and matters involving supervisory authorities.
Nicolas regularly represents clients before all Luxembourg courts, including in urgent and ex parte proceedings, as well as before European courts and authorities. He also has significant experience in multi-jurisdictional disputes, asset recovery and enforcement of foreign judgments.
Career
Admitted to the Luxembourg Bar in 2001, Nicolas Thieltgen has built over two decades of experience in complex dispute resolution and financial regulatory matters.
As Managing Partner, he has developed a strong reputation in Luxembourg for high-stakes litigation, particularly in shareholder disputes, commercial conflicts, banking litigation and financial crime proceedings.
His practice is distinguished by the combination of strategic litigation and regulatory expertise, allowing him to anticipate risk exposure and structure defence or negotiation strategies accordingly.
He previously served as an elected Member of the Luxembourg Bar Council (2018–2020).
Professional Memberships
President, Luxembourg Banking & Financial Law Association (ALJB)
Member, International Bar Association
Honorary Secretary General and Former Vice-President, Banking, Finance and Capital Markets Commission, AIJA
Member, Legalmondo
Former elected Member of the Luxembourg Bar Council (2018–2020)
Publications
Nicolas has recently contributed to several high-profile publications and professional platforms reflecting his expertise in dispute resolution, corporate conflicts and strategic regulatory matters.
He published “Disputes cannot always be avoided, but they must be anticipated” with the Association Française des Juristes d’Entreprise (AFJE), addressing risk management and litigation preparedness for corporate actors. He also authored “Local Expertise with an International Vision” with MEDEF (Mouvement des Entreprises de France), highlighting cross-border strategic advisory capabilities. In addition, he contributed to Paperjam with “Competitiveness and Europe: the Key Directions to Anticipate for 2026”, analysing regulatory and economic trends impacting businesses.
Nicolas also participated in the podcast series “Maîtriser les codes”, contributing to episodes dedicated to corporate shareholder conflicts (Season 1, Episodes 1 and 3) and white-collar criminal law (Season 2, Episode 2), further illustrating his practical insight into high-stakes disputes.
Throughout his career, he has consistently contributed to Luxembourg legal doctrine through articles and conferences covering civil procedure, corporate litigation, banking and financial law, regulatory matters and administrative law. He has published in leading legal reviews such as Bulletin Droit et Banque and Droit bancaire et financier au Luxembourg, and has been responsible since 2008 for the annual case law chronicle in Luxembourg banking and financial law.
Work Highlights
Nicolas Thieltgen focuses his practice on dispute resolution, with particular experience in complex banking, finance and corporate disputes involving cross-border financial and corporate structures.
He regularly advises financial institutions, investors and corporate shareholders in high-stakes litigation and regulatory-sensitive matters. His recent work includes representing a major international bank in a derivatives dispute against a private equity group involving ISDA documentation, regulatory proceedings and cross-border asset preservation measures under EU law.
Nicolas also acts in sophisticated shareholder and corporate disputes involving international investment structures, including governance conflicts, enforcement of financial collateral and multi-jurisdictional litigation strategies. He further represents leading Luxembourg businesses, including one of the country’s major real estate developers, in high-value disputes relating to complex investment and development structures.
In addition to his contentious work, Nicolas assists financial institutions in sensitive banking and financial services regulatory situations, particularly where litigation risk and supervisory scrutiny intersect. His work frequently involves strategic advice during crisis situations, enforcement proceedings and disputes affecting the stability, governance or regulatory position of financial institutions operating in Luxembourg.
Languages Spoken
French & English
