Business Law

We assist our clients with the negotiation, documentation and completion of their investments, along with the ongoing running of their business. We offer sound advice for both transactions and problem-solving.

We secure our clients’ legal foundations to allow them make smarter business decisions and let them focus on execution.

We handle matters in a variety of practice areas, mainly:

Company law
Commercial dispute resolution
Commercial contracts
Technology law
Start-up law

Some examples of our recent work :

  • Cross-border merger by absorption, under the EU Cross-Border Merger Regulation between Luxembourg and Irish entities, involving application for clearance under the fast-track procedure before the Irish Commercial Court
  • Advice to UK company in shareholders’ dispute in relation to Luxembourg-based, joint-venture project
  • Advice on finance raising to early-stage developer in consumer product sector
  • Advising technology company on GDPR compliance issues
  • Advising UK entity on inward investment in form of acquisition of Luxembourg-based entity operating in the health sector
  • Advising blockchain company on Series A finance raising


Our areas of expertise

About us

Dennis Law Firm is a Luxembourg based business law firm founded in 2018 by Gary Dennis.

Gary qualified as a Solicitor in Ireland in 2000. He was admitted to the Luxembourg Bar (Liste IV) in 2008, having previously worked at the European Court of Justice. Since then he has specialised in business law, EU law and dispute resolution.

Before founding Dennis Law Firm, Gary worked in the EU & Competition Law Practice Group of a major Luxembourg law firm, and as a Partner in both the commercial and dispute resolution departments of a boutique, business law firm.

Smart business gathers a smart team around itself. As an independent, business-focused law firm, our approach to working with clients is one of partnership. We listen to your plans and do the legal groundwork, giving you the competitive agility to make sharp decisions and secure smooth deals.

Our Vision

Focussed solutions are key to your business. At Dennis Law Firm, we spend time understanding your needs to ensure immediate results and lasting success. With you, we will strive to create an enduring partnership based on trust and teamwork.

Our values


Choosing Dennis Law Firm as your adviser brings all the benefits of working with an independent firm. Your success is in our best interest.

We may be independent, but we do not work alone. We have fostered close working relationships with a wide network of partner firms throughout Europe, allowing you to expand your network seamlessly.


Our firm is committed to working side-by-side with your company, finding effective solutions to your business challenges.

We operate with full partner involvement on every matter, ensuring legal excellence and high-quality advice.

We offer a flexible and responsive approach to meeting client needs, avoiding complex and wasteful hierarchies.

Close collaboration

We take time to get to know you. Understanding your ambitions and concerns allows us to implement transparent, fluid problem-solving processes and get deals done.

We aim to provide practical and commercially useful solutions to promote sustainable solutions and healthy growth.

Your success is aligned with our own; we grow onwards and upwards together.

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