Firm Profile > DSM Avocats A La Cour > Luxembourg, Luxembourg

DSM Avocats A La Cour
BP 2648, 1026 LUXEMBOURG

Dispute resolution Tier 3

Headed by Mario Di StefanoDSM Avocats A La Cour's dispute resolution team has familiarity with a range of litigation techniques, including ADR, which it effectively implements for private sector clients on real estate and tax disputes, in particular. Alban Colson is another name to note.

Practice head(s):

Mario Di Stefano

Other key lawyers:

Alban Colson

Key clients




Open Field

Commercial, corporate and M&A Tier 4

Benefiting from a 'perfect combination of experience and agility', DSM Avocats A La Cour provides 'responsive and business-minded advice' to national and international clients across a range of corporate and commercial mandates, including advice on M&A and international joint ventures. Mario Di Stefano possesses 'exceptional communication skills' and, along with the 'responsive and proactiveRenaud Le Squeren, is a key member of the team that is particularly active in the real estate sector.

Practice head(s):

Mario Di Stefano; Renaud Le Squeren


‘They are responsive and understand the client’s business rationale.’

‘They not only exhibit outstanding legal skills, but are also very friendly lawyers and staff, with whom it is a pleasure working.’

‘Top-notch firm, highly technical and with great service, from beginning til end. It displays a perfect combination of experience and agility.’

‘Mario Di Stefano provides timely and business-minded advice.’

‘Mario Di Stefano always delivers exhaustive and well-documented legal work. He has exceptional communication skills.’

‘The very responsive Renaud Le Squeren has excellent legal skills in corporate and commercial law and data protection. ’

Key clients


Vantage Data Centers (Formerly Etix Everywhere)

Tracol Immobilier

PM International

Wagner Group

IKO Real Estate


Rosalia Group

Luxembourg Capital

The firm: DSM Avocats à la Cour was founded in 2004 and is located in the heart of one of the world’s main financial centers. The firm is regularly called upon to assist in domestic, cross-border and multi-jurisdictional matters. DSM’s lawyers are recognized experts in numerous legal practice areas including corporate, real estate, finance and tax law, as well as in dispute resolution. Located in the heart of one of the world’s main financial centers, DSM provides its national and international clientele multidisciplinary, multilingual services suited to Luxembourg’s current environment.

Main international areas of practice
Corporate/mergers and acquisitions: The corporate and M&A team assists clients in all aspects of their transactions including due diligence; incorporation of special purpose vehicles in the context of investment and business activity structuring; the transfer or assignment of real estate; the creation of charges and all types of guarantees; leasehold agreements and rights (bail emphythéotique, droit de superficie); and, corporate financing, including drafting of the necessary legal opinions. Corporate and M&A is always tied to tax issues and DSM’s corporate and M&A department works with its tax law department to devise the best solutions for our clients.

Real estate and construction: DSM advises on the entire lifespan of a real estate project including obtaining administrative permits for general and specific development plans and environmental permits; dealing with urban planning issues, corporate structuring; real estate sales and the sale of shares; financing; contracts for transfers, rentals, guarantees and surface area (contrat de superficie); and, advising in civil and administrative disputes over issues such as construction, co-ownership and guarantees.

Tax advice and tax dispute resolution: DSM’s Tax team advises corporate clients on a wide range of international transactions, investment structures as well as on day-to-day business matters involving Luxembourg. It not only represents Luxembourg companies, shareholders and lenders but also borrowers, collateral providers and pledgees. All tax fields are covered, including income tax, municipal business tax, net wealth tax, VAT and other particular taxes or registration duties. DSM also advises on private wealth management and private wealth vehicles, such as family wealth management companies (SPFs), family offices and private foundations, including with respect to tax planning and managing international successions and inheritances.

And, we cover the full range of tax advisory services from strategic tax planning to high-end technical advice, as well as the establishment, review and follow-up of tax compliance documents regarding direct taxes and VAT. DSM also assists its clients in the context of cross-border administrative procedures for the elimination of double taxation situations.

DSM’s tax team has significant experience interfacing with the Luxembourg tax authorities in local and cross-border matters at any pre-litigation phase. During the litigation phase, the tax team represents its clients before all Luxembourg and EU courts international tax litigation practice, including with respect to direct taxes and VAT.

Banking and financial law: DSM’s banking and financial law team advises on financial transactions involving Luxembourg and foreign entities or in respect of Luxembourg-based assets. We advise banks and professionals of the financial sector (PSF), representing lenders as well as borrowers, collateral providers and pledgees. We advise on financing and the taking of security, not only on all structuring, tax and ancillary aspects of both traditional corporate finance but also more complex financing arrangements and hybrid financial instruments. We further advise financial institutions and other professionals in the financial sector on all aspects of client contractual relations and documentation, professional liability, criminal financial law liability, corporate governance and personal data protection.

In cooperation with DSM’s litigation team, we advise on litigation, dispute resolution, and arbitration in finance-related matters both in Luxembourg and internationally. We also assist bankers and financial professionals in financial criminal proceedings.

Digital: Our digital team advises on complex international transactions as well as local intellectual property (IP) and technology, media and telecommunication (TMT) transactions. This includes advising on, drafting and negotiating technology contracts such as hardware and software supply contracts, licenses, general terms of use, as well as design, building and operating, turnkey, O&M, systems integration and offshore outsourcing contracts. Our team also provides legal advice and support for issues on IT rights, data protection, licenses and exploitation of intellectual property rights, counterfeiting, consumer law and litigation in Luxembourg, including the use of Luxembourg investment vehicles enabling the protection of technology and intellectual property assets. The team further assists clients with clouds, telecoms, biotechnology, health, and provides assistance to all operators confronted with obligatory rules associated with new technologies.

Investment funds and investment management: DSM’s investment funds and investment management team advises clients in setting up and administering their Luxembourg fund structures and investment vehicles. We assist our corporate and private clients in choosing the most appropriate investment fund structures and determining their key characteristics. This includes advising on alternative investment funds (AIF) including specialised investment funds (SIF) or reserved alternative investment funds (RAIF) to implement various investment strategies (real estate, private equity, hedge funds); ensuring compliance of a fund’s legal documentation with new laws and regulations; assisting funds and investment vehicles in the acquisition, management and divestment of assets; coordinating with the financial sector supervisory authority (Commission de Surveillance du Secteur Financier or CSSF); and, advising on AIFMD, SFTR and MifiD II issues, as well as data protection matters (GDPR).

Dispute resolution: The DSM team handles national and international matters. alternative dispute resolution (ADR) techniques geared towards cost-effective and timely dispute resolution are part of the firm’s practice, which has advised on cases submitted to international arbitration, including to the International Chamber of Commerce (ICC) and mediation.

EU and competition law: DSM advises on all aspects of EU and competition law (cartels, leniency applications, abuse of a dominant position, joint ventures, distribution and licensing issues, damage claims, EU merger control and state aid). We litigate before the European adjudicatory bodies located in Luxembourg, be it for international companies or private individuals, Court of Justice of the European Union, the General Court of the EU, the European Commission and the Luxembourg Competition Council.

Department Name Email Telephone
Real estate and construction, Corporate/M&A, Investment funds, Commercial and business law, Employment and social security law, Dispute resolution, Restructuring and insolvency, Tax Mario Di Stefano
Real estate and construction, Corporate/M&A, Commercial and business law, Digital, Restructuring and insolvency Renaud Le Squeren
Banking and financial law Marie-Paule Gillen
Banking and financial law, Tax, Corporate/M&A, Commercial and business law Jérôme Bach
Dispute resolution Alban Colson
Tax advice and tax dispute resolution Alex Pham
Photo Name Position Profile
Mr Jérôme Bach  photo Mr Jérôme Bach Partner – Avocat à la Cour
Mr Alban Colson  photo Mr Alban Colson Partner – Avocat à la Cour
Mr Mario Di Stefano photo Mr Mario Di Stefano Managing Partner – Avocat à la Cour and Rechtsanwalt
Ms Marie-Paule Gillen photo Ms Marie-Paule Gillen Partner – Avocat à la Cour
Mr Renaud Le Squeren  photo Mr Renaud Le Squeren Partner – Avocat à la Cour
Mr Alex PHAM  photo Mr Alex PHAM Partner Tax – Avocat à la Cour
Number of lawyers : 22
ALFA International
Association of European Lawyers (AEL)
International Business Law Consortium (IBLC)
SCG Legal
UIA (Union Internationale des Avocats
British Chamber of Commerce
ILA (Luxembourg Institute for Directors)

As a member of IMS Luxembourg – Inspiring More Sustainability since January of 2020 and signatory of the Diversity Charter since 2015, our firm is committed to the environment and social justice, to which our recent actions in sustainable development, the training of young people, diversity, legal sponsoring as well as the promoting of a healthy work environment attest.

Here are other examples of concrete actions we take at our firm:

  • ESTABLISHMENT OF WORKING HOURS AND WORKING TIME ON RELIGIOUS GROUNDS: Staff and lawyers are entitled to ask partners to leave earlier on certain days, to come in later in the morning or to agree to other working hours to enable them to practice their religion.
  • WORK-LIFE FLEXIBILITY: The compatibility of work and family life is important to us. Whether it be flexible working hours in case of family necessities or parental leave for new mothers and fathers, we support those situations with measures that help our employees balance their professional and personal lives.
  • During COVID-19: We adopted a schedule by which the large majority of our lawyers and staff were working from home. Most of the lawyers were already equipped with laptops provided by the firm. We acquired more laptops and equipped the entire DSM team and staff with laptops that are configured according to our safety standards. We have taken the appropriate measures to isolate from each other the members of our team who are present on site, so as to maximally mitigate the risk of contamination. Anyone present is alone in an office.
  • LIFE-PHASE ORIENTED WORKING HOUR POLICY: While it is generally easier for large companies to introduce a flexible working hour policy, DSM Avocats à la Cour has recognised the needs of its employees and, as a medium-sized law firm with manageable human resources, has taken up the challenge of meeting the needs of employees in certain phases of their lives for flexible working hours, spatial independence and the reconciliation of family and career. Currently approximately 15% of firm employees use a part-time model.

We at DSM are convinced that the diversity of our employees, as reflected in their gender, age, origin, sexual orientation, religion, marital status, education, and individual values, improves our ability to fulfil our tasks, enhance our performance and innovate to our clients’ benefit. Diversity at DSM goes beyond simple appreciation. It is an expression of the integration of different potentials and world views in the daily work of our firm and is our strength. Cooperation in our diverse work environment is based on respect and tolerance for each other. Given our international clientele, the broad knowledge and extensive experience of our employees with their different nationalities and cultures is a definite advantage. We expressly seek this diversity in making our hiring decisions. It allows us to appropriately adapt to our clients’ needs because we speak their language. DSM gives women and men equal opportunities to develop their personal and professional skills. More than half of our employees are women. The compatibility of work and family life is important to us. Whether it be flexible working hours in case of family necessities or parental leave for new mothers and fathers, we support those situations with measures that help our employees balance their professional and personal lives. We see diversity as our opportunity.

DSM Avocats à la Cour voted Best Workplace Luxembourg 2020 by Great Place To Work: It is by offering the best possible environment to all who work at DSM Avocats à la Cour that we will continue each day to bring excellent service to our clients.

Luxembourg, gateway to European and international business

Many clients intend to use Luxembourg as a starting point to develop their business internationally. This is particularly true for clients who require a platform from which to extend their business throughout the European Union, especially those who wish to take advantage of the EU passport notification regime in banking and financial matters. In this context, we provide assistance on Luxembourg law matters and broaden our capabilities to include advice with an international perspective by requesting assistance from our partner law firms abroad.

An international perspective thanks to our membership in International Networks

DSM Avocats à la Cour has long been a member of several major international legal networks allowing us to partner with top quality law firms around the world with expertise in a multitude of practice areas. We maintain a close relationship with them and can count on their prompt support abroad at any time. Our international counterpart firms are independent law firms as we are and provide us a broad selection of alternatives from which to choose. We are currently a member of the legal networks listed below.


Among DSM’s clients are companies and institutions from various sectors of industry and commerce, including major Luxembourg and international banks and financial institutions, industrial manufacturing and refining companies, an industrial recycling plant, wholesale and retail distributors, real estate developers, real estate brokers, builders and contractors, high net worth individuals, as well as public bodies.

CLIENT: Banking
TESTIMONIAL: Availability and responsiveness levels are perfect.

CLIENT: Project Development
TESTIMONIAL: Professional and has good knowledge of local regulations.

TESTIMONIAL: Very good work, team responsiveness and availability

CLIENT: Real Estate
TESTIMONIAL: Very proactive and results-oriented in the way they work

CLIENT: Real Estate
TESTIMONIAL: Mario DI STEFANO is an absolute specialist, very solution-oriented and goes 100% in for the client. He is always available and has a detail-oriented approach. Good strategy and to the point advice.

CLIENT: Corporate
TESTIMONIAL: Availability and responsiveness levels are perfect