De Brauw Blackstone Westbroek is known for its expertise in domestic and cross-border criminal and regulatory investigations, leveraging particular experience regarding financial market regulation and corporate governance issues. Marnix Somsen co-leads the team and is a go-to for issues involving the US, while fellow co-head Roan Lamp focuses on multi-jurisdictional matters involving China. Somsen excels in cross-border enforcement issues such as bribery and corruption and elsewhere assists in internal investigations. Lamp is sought-after by Dutch multinationals for his knowhow in sensitive investigations. Marlies de Waard is noted for her work on economic sanctions and export controls.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Lawyer & team quality
Client satisfaction: Sector knowledge
Testimonials
Collated independently by Legal 500 research team.
- ‘Roan Lamp provides excellent legal advice in a fast, practical and strategic way.’
- ‘Top of its class for clients who wish to settle rather than litigate. They are able to oversee not just the domestic implications but pull in the right expertise to manage the cross-jurisdictional angle as well.’
- ‘Deep expertise in both legal and regulatory frameworks. The team comprises seasoned professionals with extensive backgrounds in criminal law, compliance, and corporate governance, which enables them to navigate complex cases effectively.’
- ‘Marnix Somsen is by far the most respected and trustworthy advisor you would like to have at your side in sensitive and complex cases.’
- ‘The team has worked together for a long time and each person is equipped to execute what is needed. The teams is quick to get going.’
- ‘Roan Lamp has a very balanced view on matters. I like his approach.’
- ‘Great practical and often outside the box advice. Super client oriented. Know clients’ businesses extremely well.’
- ‘Marnix Somsen is a fantastic lawyer. Amazing thinker who can make the switch to very practical advice! Marlies de Waard is a great lawyer and an upcoming talent! Understands business very well and gives great tailored advice. Great communicator.’
Key clients
- Glencore International
- ABN Amro
- Philips
- Uber
- Shell
- NXP
- Arcadis
- Booking.com
- Arcadis
- Ennia
- Lelystad Airport
- Astra Oil Trading
- SBM Offshore
- GasTerra
- ITV
- Erasmus Hospital
- AMG
- Scotiabank
- Ikea
Work highlights
Represented Glencore in relation to alleged bribery issues in the Democratic Republic of Congo that is being investigated by the Dutch Public Prosecutions Office.
Assisted Philips with its two-year periodic compliance reporting to the US Securities and Exchange Commission which ended in May 2025.
Represented ABN Amro Bank in connection with a criminal investigation into the bank's compliance with applicable AML requirements.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Marlies de Waard
Practice head
Marnix Somsen; Roan Lamp
Other key lawyers
Marlies de Waard; Youmi Jun