Onno Hennis

Corporate law Lawyer

Onno Hennis

About Onno

Onno Hennis has been a lawyer since 2009 and joined the AMS Advocaten team in 2015. Onno studied law (with honours) and European Studies at the University of Amsterdam and the Humboldt University in Berlin. Following his studies, Onno worked at De Brauw Blackstone Westbroek, where he successively dealt with mergers and acquisitions, and general procedural law.


At AMS Advocaten, Onno focuses on advising and litigating in commercial and corporate disputes. He deals with issues that arise within companies (such as impasses in general meetings of shareholders and directors’ and officers’ liability), as well as disputes between companies and external parties (such as former trading and investment partners, suppliers and customers).

Onno successfully completed the specialization course in Company Law and Business Law at the Grotius Academy. This is the most comprehensive and complete postgraduate training in corporate law.

Lecturer at the University of Amsterdam

Onno is a lecturer at the University of Amsterdam, where he lectures and guides students in their participation in international advocacy competitions. He gives lectures for the master’s course “International Commercial Arbitration’ and assesses bachelor’s essays and master’s theses.

German Desk

Onno speaks fluent English and German. Thanks to his experience – including at Allen&Overy in Frankfurt am Main – he is in an excellent position to advise clients who have activities in Germany. Onno is responsible for the German Desk of AMS Advocaten.

Expert at BusinessInsider.nl and BNR

In addition to his daily law practice, Onno is also an expert attached to the Dutch business news website BusinessInsider.nl. In the radio programme BNR Juridische zaken, Onno regularly presents his views on current legal themes.

Onno has registered as principal areas of law in the register of legal areas of the Netherlands Bar: civil procedural law and corporate law. On the basis of this registration, he is obliged to obtain ten training credits per calendar year in each registered principal legal area in accordance with the standards of the Dutch Bar Association.

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Blogs by Onno

Dutch procedural law

Courts must make case details and hearing dates public

Groundbreaking ruling In a groundbreaking ruling, the Supreme Court has ruled ...

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Corporate law in The Netherlands

Sound reasons to doubt the policy and the course of business at Centric

On 27 January 2023, the Netherlands Enterprise Court ordered an investigation. ...

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Dutch liability law

DJ Paul van Dyk successfully claims millions from dance organiser after falling off stage

DJ Paul van Dyk fell off a stage during a performance in Utrecht in 2016. He suffered ...

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