Attorney at law, Partner

Jikke Biermasz


As of 1st May 2019 Jikke heads the International Trade, Customs & Logistics practice group at the Rotterdam law firm Ploum. Her team’s services include advising on and conducting civil, administrative and criminal litigation and corporate investigations in the areas of international trade, logistics, insurance, customs, export controls & sanctions  and product compliance, including litigation before the Dutch Supreme Court. The team focuses in particular on the industry sectors Trade & Logistics, High Tech & Industry, Food & Agriculture and Life Sciences & Health.

In her practice, which includes both commercial advisory services and litigation, Jikke combines specialist knowledge in the field of customs law, anti-dumping and trade-regulatory law, with extensive experience in neighbouring fields, including civil and criminal law. Jikke offers an integrated, multidisciplinary approach and therefore a true ‘one-stop-shop’ for all customs and export control related matters.

Jikke has a strong network in logistics which enables her to connect market players and to find out of the box solutions both in and outside the legal arena. Jikke: ‘I work for my clients to achieve the best feasible solution, preferably with willing parties – but if necessary, through tactical litigation. In my view, a lawyer is not called in for the conflict, but for the solution.’

What clients say about me

“When Jikke and I started to discuss the creation of a network of customs law firms, Jikke immediately became the engine. GreenLane (for which, by the way, she suggested the name) has developed since as a very prosperous venture. Not only in terms of cooperation and organization but also in commercial terms. At the moment she stepped in, she took ownership. We actually generate money and in that sense I consider GreenLane in my own firm as an evident plus on my CV, which is clearly recognized by my partners. At the beginning we started with five, now we have thirteen member firms in the EU and 7 members in third countries such as China, India and Brazil.. Jikke played an immense role in putting this together as she is by far the most energetic of all of us. She deploys great ideas for business development: both aimed at approaching clients and organizing events. In a nutshell I should say that I like particularly her business acumen. GreenLane would not have been there without Jikke.” - Yves Melin, partner at Reed Smith.


After graduating cum laude in both criminal and business law, Jikke started her career as a lawyer in 2004 with the international law firm DLA Piper, where she gained the necessary experience in all aspects of international trade, transport and insurance law. In addition, she specialized in customs law, export control and sanctions legislation.

In 2008, Jikke passed the specialist postgraduate Grotius Transport Law course, once more with distinction, and at the same time also successfully finished the post masters Customs Law at the European Fiscal Studies Foundation of Erasmus University in Rotterdam.

Jikke is fluent in Dutch and English and frequently publishes articles on customs and export control and sanctions legislation. She wrotes fort he column VAT and Customs of Kluwer Highlights & Insights, chairs the examination board of KGH Douaneopleidingen Nederland, lectures customs law fort he Dutch Forwarders Association FENEX and is founder and board member of GreenLane, an international network of customs and trade law firms both in and outside the EU.


  • Specialization course in criminal law, VU Law Academy of the VU University Amsterdam, 2020-2021
  • Specialization course criminal evidence law, VU Law Academy of the VU University Amsterdam, 2020
  • Traning course Customs Consultant, KGH Douaneopleidingen Nederland
  • Post-Master ‘Customs’ of the Foundation European Fiscal Studies (Erasmus University Rotterdam) (2009 and 2017)
  • Grotius specialist course transport law, cum laude (2008)
  • Basic Training Mediation, Mediation and Training Network, The Lime Tree
  • Business and criminal law, Leiden University, cum laude (2004)
  • Basic Training Mediation, Mediation and Training Network, The Lime Tree

Examples of recent work

  • Jikke assists various importers, carriers and customs brokers (and their insurers) with national lawsuits against Dutch Customs and in proceedings in front of the European Commission and European Court. This concerns disputes on origin, customs value, tariff classification and/or anti-dumping duties. Each time it focuses on other products: such as solar panels, fasteners, bicycles, shoes, chemicals, garlic, vitamin preparations, aeroplane parts, soya oil, cigarettes, fish, rice, rollators, games computers, steel cables and LED lamps.
  • Because of her knowledge of customs and logistics contract law, Jikke regularly drafts complex logistics contracts and general conditions for logistics service providers and customs brokers or their clients. These parties use these documents to arrange their mutual legal relationship.
  • Jikke advises different (Dutch) exporters and multinationals on the implications of export control and sanctions regulations. Is (for example) exporting to Iran or Russia permitted?
  • Sometimes a court ruling means that clients have paid too much customs duties in the past. Declarations should have been made under a commodity code with a lower tariff. Jikke follows the developments in caselaw and for different clients she has already been able to achieve a ‘pleasant surprise’ by asking for a refund of substantial amounts of customs duties.
  • In case of trademark infringements too, customs officials take measures and can seize goods. In several situations Jikke has dealt with border detentions.
  • Jikke is regularly charged with the management of due dilligence investigations in mergers and acquisitions of customs brokers and other logistics services providers. The added value of Ploum as a full service law firm, with specialist knowledge of trade, customs and transport law is evident.
  • Jikke is active in several international and national projects to stimulate and support innovation and collaboration between shippers and logistics services providers in the supply chain.

Memberships and additional functions

  • Dutch Association for Transport Law (NVV)
  • Dutch Association of Criminal Lawyers (NVSA)
  • Lecturer customs law at FENEX
  • Board member and founder of the GreenLane network (The Alliance of European Customs and Trade Lawfirms)
  • Chairman of the examination board of KGH Douaneopleidingen Nederland
  • Author for the column VAT and Customs van Kluwer Insights
  • Member of AIJA (Association International des Jeunes Advocats)


The Netherlands Bar’s register of legal practice areas (rechtsgebiedenregister)

Jikke Biermasz has registered the following principal (and secondary) legal practice areas in the Netherlands Bar’s register of legal practice areas (rechtsgebiedenregister):

  • Criminal law (strafrecht)

Based on this registration, Jikke Biermasz is required to obtain ten training credits per calendar year in each registered principal legal practice area in accordance with the standards set by the Netherlands Bar.

Track records

Ask a question

Subscribe to our newsletter

Personal data


Company details

For more information on how we use your personal information, please see our Privacy statement. You can change your preferences at any time via the 'Change your details' link or unsubscribe via the 'Unsubscribe' link. You will find these links at the bottom of every message you receive from Ploum.

* This field is required

Interested in

Create account

Get all your tailored information with a My Ploum account. Arranged within a minute.

I already have an account

Benefits of My Ploum

  • Follow what you find interesting
  • Get recommendations based on your interests
  • Subscribe quickly to knowledge events and Ploum Academy
  • Use question and answer options in articles

*This field is required

I already have an account

Benefits of My Ploum

Follow what you find interesting

Receive recommendations based on your interests

Quick registration for knowledge events and Ploum Academy

Post comments on articles

Why do we need your name?

We ask for your first name and last name so we can use this information when you register for a Ploum event or a Ploum academy.


A password will automatically be created for you. As soon as your account has been created you will receive this password in a welcome e-mail. You can use it to log in immediately. If you wish, you can also change this password yourself via the password forgotten function.