About us.

Boutique law firm

We are Claudia Koken and Esther van Aalst. We are the boutique law firm COMP. lawyers. Our total focus is on competition, consumer and compliance matters. That is exactly what we have been doing for the past 25 years. 

Imagine: we joined forces. This enables us to provide you and all our international and national clients with the best tailored competition and consumer law advice and strategies.

Our clients entrust us with their – challenging – competition, consumer and compliance cases. We know from experience that these matters are crucial and have a major impact on you, your business and your corporate reputation. 

Your reputation is key to the success of your business. All our clients are companies, some of them are among the world’s largest multinationals, while others are scale-ups working hard to gain Unicorn status.

When you breach competition and consumer law rules, your reputation is affected. Your business could face investigations by competition or consumer law authorities. Your commercial contracts may be invalid. High fines can take up 10% of your consolidated turnover and can lead to potential claims for damages that further discredit your business.

We know the risks. We guide, advise and supervise when it is relevant and matters. Our unique approach puts your reputation and your business success at the heart of our work. That makes us experts in our fields. With over 25 years of experience and our backgrounds working for regulators, for global law firms and as in-house counsel, we have the track record needed to provide you with the best service.

We are committed to providing clear, pragmatic advice and effective business solutions. We simplify for effectiveness. With our personal approach, we take care of your business and – where and if necessary – we cure.

Projects in-house & lawyer’s lawyer

We are experienced project and project management lawyers for in-house assignment at corporates. We are regularly hired by other law firms without competition law or consumer law capabilities. Examples of our project and counsel’s work include:

  • Assisting in the conduct and coordination of multi-jurisdictional cartel investigations
  • Setting up, implementing, coordinating and supervising competition and consumer law compliance programmes
  • Leading multi-jurisdictional notification procedures in M&A transactions (merger control)
  • Commercial contracting
  • Temporary replacement of specialists
  • Temporary addition of specialists to a legal team

Our lawyers

Claudia Koken – Competition, consumer law and compliance lawyer


Claudia Koken advises on Dutch and European competition law, state aid, (corporate) compliance and consumer law in the full breadth. Claudia is co-founder of COMP. lawyers and has over 25 years of experience.

Claudia Koken

Partner and lawyer
Esther van Aalst - Competition, consumer law and compliance lawyer


Esther van Aalst has over 25 years of experience as a lawyer and is co-founder of COMP. lawyers. She advises on the whole range of competition, consumer law and compliance.

Esther van Aalst

Partner and lawyer