Marnix Somsen


Office location
Direct number
+31 20 577 1628
Direct fax
+31 20 577 1775
Mobile number
+31 6 5374 5631

Advocaat, admitted to the bar in 1996
Partner since
Regulatory & Criminal Enforcement
Dutch, German, English, French
University of Amsterdam, Harvard Law School, Columbia Law School

Marnix Somsen specialises in regulatory and criminal enforcement. He represents corporations and financial institutions subject to investigation and enforcement proceedings. His experience spans both the US, Europe, Africa and Asia. Recent work includes representing publicly listed companies in enforcement actions brought by the SEC, the FED, OFAC, BIS, the DoJ, the CFTC, the FCA, the SFO, BaFin, the AMF, the HKMA, the MAS, the JFSA, DNB, the OM and the AFM on a variety of regulatory and criminal charges.

Marnix typically handles cross-border enforcement matters and internal investigations for EU companies involving one or more US or other foreign regulators, drawing upon the resources of our international Best Friends network. Over the past few years, issues have included:

  • Libor and other financial benchmarks
  • FCPA and UKBA
  • other anti-bribery statutes
  • international sanction programs (UN, US, EU, Worldbank)
  • export controls
  • anti-money laundering
  • insider trading
  • market & price manipulation
  • banking & securities fraud
  • regulatory compliance failures

Marnix’s work includes international coordination among local law firms, reputational damage mitigation, remedial & disciplinary measures, press relations, market disclosures, dealing with whistleblowers and managing voluntary self-disclosures. He and the team are consistently ranked tier 1, with personal reports ranging from “highly skilled and knowledgeable” (Legal 500) to “excellent legal brain” (IFLR 1000) and his team praised as “market leaders when it comes to regulatory work” and “leading white collar team” (IFLR 1000).

Currently the co-chair of the IBA Anti-Corruption Committee for the Netherlands, Marnix has recently co-edited Onderneming en Sanctierecht, a Nijmegen University textbook on regulatory and criminal enforcement. Formerly an editor in chief of Tijdschrift voor Sanctierecht & Compliance, the Dutch enforcement & compliance law review, Marnix now serves on its Board of Advisors.

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