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KLEYR GRASSO is a leading Luxembourg business law firm advising international and domestic clients on corporate/M&A, investment funds, financial services, tax, employment, real estate, litigation and arbitration, including complex cross-border matters.
Our lawyers are fully engaged in an international practice, regularly assisting with cross-border transactions and working closely with a broad network of correspondent law firms in the world’s leading financial and economic centres.
KLEYR GRASSO is recognised for its legal expertise, responsiveness and pragmatic, business-focused approach.
Our firm was founded in 1994. In our early years, we built substantial expertise in litigation and advisory services for local clients.
Over time, we expanded our focus to include international clients and cross-border businesses, providing comprehensive legal solutions across all areas of law.
We proudly advise a diverse clientele, including local and multinational companies across all industry sectors. Our client portfolio includes some of the world’s largest corporations, leading institutional investors, prestigious private equity houses, and various businesses and professionals.
We collaborate extensively with leading audit and tax firms, enhancing our ability to provide comprehensive solutions. Additionally, we regularly engage in cross-border cases with foreign magic circle and other firms, who recommend our legal services to their clients seeking expertise in the Luxembourg jurisdiction.
Our vision is to solidify our position as one of the leading independent law firms in the Luxembourg legal market. We aspire to achieve this by maintaining our values and focusing on understanding our clients' businesses, delivering tailor-made quality, responsive and innovative services, and providing real and pragmatic solutions.
We believe that clients rightly expect us to comprehend their businesses and offer commercially sound solutions. Our approach involves taking the time to understand our clients' businesses and providing them with personalized and commercially viable solutions.
It is crucial for us to be familiar with the industry sectors in which our clients operate. We actively stay informed about all major developments, ensuring that our advice is up-to-date, relevant and aligned with our clients' business environments.
We are often described by our clients as a friendly, proactive and responsive firm. At our core, we prioritize quality over quantity, ensuring that every interaction and service we provide meets the highest standards.
We uphold a steadfast commitment to quality in all our endeavors. This means delivering excellence in every service we provide, from legal advice and representation to client communication and satisfaction. Quality is embedded in our work ethic, ensuring that we consistently strive for the highest standards of professionalism, accuracy, and effectiveness. By prioritizing quality, we not only meet but exceed the expectations of our clients, fostering long-term trust and loyalty.
We embrace ambition as a driving force behind our continued growth and success. Ambition fuels our pursuit of innovation, excellence, and continuous improvement, inspiring us to push boundaries, explore new opportunities, and overcome challenges. We are committed to ambitious goals that stretch our capabilities and propel us toward greater achievements. By cultivating a culture of ambition, we empower our team to reach new horizons of excellence and make a meaningful impact on the legal profession and beyond.
Independence is fundamental to our integrity and autonomy as a firm. We prioritize independence in decision-making, ensuring that our actions are guided by principles of impartiality, objectivity, and ethical conduct. We maintain independence from external influences to safeguard the interests of our clients and uphold the highest standards of professional integrity. By remaining independent, we preserve our freedom to act in the best interests of our clients, uphold the rule of law, and contribute positively to society.
In essence, these core values — quality, ambition, and independence — serve as the cornerstone of our firm's identity, guiding our actions, shaping our relationships, and driving our collective pursuit of excellence in the legal profession.
We take the time to thoroughly understand our clients' businesses and their specific needs. Our approach is characterized by providing legally sound and pragmatic solutions tailored to the unique requirements of each client.
Our commitment to client-centricity ensures that our solutions are not only comprehensive but also strategically aligned with the specific goals and circumstances of our clients.
While we maintain a strong international character, we have cultivated close working relationships with distinguished law firms worldwide that share our philosophy and standards of quality. Independence, in our context, also means the liberty to accept clients of all sizes and sectors, treating each with an equal level of commitment.
We deliberately chose to remain an independent, non-affiliated firm. Independence for us means the freedom to select the most competent law firm in each jurisdiction for complex cross-border transactions, ensuring the best outcomes for our clients.
For our clients, our independence translates into the flexibility to choose the most competent law firm in each jurisdiction, ensuring optimal handling of their legal matters. It also means that we treat each client with the same dedication, irrespective of their size or sector.
KLEYR GRASSO is a leading independent Luxembourg law firm that is distinguished for offering a comprehensive range of services and extensive experience across diverse practice areas.
Our expertise and legal know-how have been meticulously cultivated over many years, encompassing proficiency in over 20 domains of expertise.
At KLEYR GRASSO, we understand that the legal landscape is dynamic and industry-specific. We are certainly one of the Luxembourg law firms rendering the most full service.
Our dedicated team of legal professionals is committed to providing tailored solutions to meet the unique needs of clients across diverse sectors.
We achieve this through:
Internationally, our strategic focus is to be an independent but leading Luxembourg law firm in the local legal market. We handle cross-border and multi-jurisdictional client matters in collaboration with high-profile correspondents and distinguished foreign law firms.
Recognition by top directories such as The Legal 500 and Chambers and Partners underscores our firm’s expertise and dedication to client satisfaction.
For over two decades, we have proudly earned top-tier recognition, reinforcing our reputation as a trusted legal partner in Luxembourg.
KLEYR GRASSO is proud to be recognized once again by Chambers and Partners in its 2025 Europe guide for its exceptional legal expertise. Our ongoing position among the top law firms in Luxembourg across various practices underscores the quality of our work and the unwavering standards of excellence we uphold every day.
KLEYR GRASSO is proud to be ranked in the Chambers Global Guide 2025 for our expertise in Corporate & M&A, Investment Funds, and our German Desk. This recognition underscores our strong international capabilities, deep industry knowledge, and commitment to delivering high-quality legal services across multiple practice areas.
Explore our rankings and client reviews on the Chambers and Partners website: KLEYR GRASSO profile
KLEYR GRASSO has once again secured a Top-Tier ranking in the prestigious Legal500 EMEA 2025 for Luxembourg. This recognition underscores our firm's dedication to excellence, client success, and legal expertise across our key practice areas.
Dispute resolution — Tier 1
Leading partners: Marc KLEYR, Rosario GRASSO, Donata GRASSO
Recommended lawyers: Emilie WATY, Vincent ALLENO, Muriel Piquard
Employment — Tier 1
Leading partners: Christian Jungers
Next Generation Partners: Céline Defay
Recommended lawyers: Anissa Bali, Philippe Ney, Christophe Ney
Real estate and construction — Tier 1
Leading partners: François Collot, Yasmine Poos
Recommended lawyers: Henry De Ron, Fanny Mazeaud, Mélanie Trienbach
Banking, finance and capital markets — Tier 3
Recommended lawyers: Renata Jokubauskaite, Pierre-Alexandre Degehet, Delphine Tempe
Commercial, corporate and M&A — Tier 3
Leading partners: Pierre-Alexandre Degehet
Recommended lawyers: Jean-Paul Spang, Delphine Tempe, Renata Jokubauskaite, Jérôme Burel, Katia Bartholome
Investment funds — Tier 3
Recommended lawyers: Mevlüde-Aysun Tokbag, Luc Courtois, Garry Reuland, Fabian Frankus
Private equity — Tier 3
Tax — Tier 4
Recommended lawyers: Lionel Bonifazzi, Valeria Ercolini
We are deeply grateful for the outstanding feedback from our clients, recognizing the dedication and excellence of our legal team. Their appreciation highlights the exceptional work of our lawyers, many of whom have been individually recommended in the rankings.
Explore our full rankings on The Legal 500 website: KLEYR GRASSO profile
KLEYR GRASSO Reaffirmed as a Leading Law Firm in Luxembourg by Chambers Europe 2026
KLEYR GRASSO is proud to announce its continued recognition in the Chambers Europe Guide 2026, reaffirming the firm's position among the leading law firms in Luxembourg.
This latest edition once again reflects the strength, depth and consistency of our expertise across key practice areas, as well as our unwavering commitment to delivering pragmatic, high-quality and commercially focused legal advice to our clients.
Chambers' research is built on extensive market feedback and in-depth interviews with clients and peers. Being consistently recognised over the years is a strong endorsement of the trust our clients place in us and the dedication of our teams to excellence, innovation and responsiveness.
We would like to sincerely thank our clients for their continued confidence and our teams for their outstanding work and commitment.
At practice level, Dispute Resolution and Employment once again achieve Band 1 rankings, maintaining their leading positions in the Luxembourg market and reflecting long-standing client trust and market recognition. The firm also maintains its rankings in Corporate/M&A and Real Estate, both recognised in Band 4, confirming the consistency and reliability of these practices. In addition, the Investment Funds practice records a positive development, achieving a Band 4 ranking in the current guide, reflecting increased visibility and recognition.
In Employment, Christian Jungers (Band 2) continues to be strongly recognised, alongside Anissa Bali and Céline Defay, both maintaining their Band 3 rankings, reflecting the sustained reputation of the team in this field.
The firm's Dispute Resolution practice remains a cornerstone of its market standing, with Donata Grasso maintaining her Band 2 ranking and Marc Kleyr once again recognised as an Eminent Practitioner, confirming their longstanding leadership in complex litigation and dispute matters.
In Corporate/M&A, Pierre-Alexandre Degehet maintains his Band 4 position, while Delphine Tempé achieves an improvement to Band 4, reflecting growing recognition of her expertise and market presence.
The Investment Funds practice also records strong results, with Luc Courtois maintaining his Band 4 ranking and Mevlüde-Aysun Tokbag improving to Band 4, underlining the team's increasing visibility in this competitive area.
In Real Estate, Yasmine Poos maintains her Band 3 ranking, while François Collot progresses to Band 3, demonstrating enhanced recognition of the firm's real estate capabilities. Lionel Bonifazzi likewise records an improvement to Band 4 in Tax, further strengthening the firm's profile in this area.
Together, these individual rankings reflect KLEYR GRASSO's ability to deliver consistent excellence across practices, combining experienced market leaders with lawyers whose profiles continue to strengthen year after year.
Explore our rankings and client reviews on the Chambers and Partners website: KLEYR GRASSO profile
Céline Defay et Lorraine Chéry vous donnent rendez‑vous pour une conférence dédiée aux décisions clés de jurisprudence en droit du travail. Un décryptage essentiel pour comprendre…
Our German Desk team — Mevlüde-Aysun Tokbag, Garry Reuland and Muriel Piquard — will be in Frankfurt to connect with market participants and discuss key developments…
We are pleased to attend the IBA Annual Litigation Forum in Madrid, a key global event for the international litigation community. Partners Marc KLEYR and Emilie…
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