Firm Profile > Ploum > Rotterdam, Netherlands

PO BOX 711

Energy: transactional Tier 2

Rotterdam-based Ploum is best known for handling projects for oil and gas companies and assists energy companies, including two of the four largest Dutch energy companies - NUON - Vattenfall and Eneco on M&A transactions. 'Excellent dealmakerStephan Sluijters, who leads the energy team together with Deborah Nizamoeddin, is increasingly instructed with respect to renewables.

Practice head(s):

Stephan Sluijters; Deborah Nizamoeddin

Other key lawyers:

Jolande van Loon; Maayke Maas-Cooymans; Stephan Nizamoeddin; S.F.J. Sluiter; Jeroen Terstegge; Jacob Henriquez


The client service is always high, as is the quality of the advice. The firm is especially strong in M&A work in the energy sector, and has an excellent track record. Hands-on, client driven and very easy to work with. Good value for money spent. Excellent alternative for the expensive ‘Zuid-As’-Firms.

Jeroen Terstegge is a  rising star in the M&A/corporate/energy sector, very pleasant to work with, dedicated and a very clever lawyer with in-depth knowledge. He delivers great work. He is able to understand very complex issues and to deliver clever solutions.

Stephan Sluijters –  very pleasant, fast thinking lawyer and an excellent dealmaker. He does understand what clients would like to see. Responsive and on the ball.’

Key clients

ABN AMRO Energy Transition Fund B.V.

Alliander N.V.

BayWa r.e. renewable energy GmbH

BayWa r.e. Solar Projects GmbH

Bergen Engines



Evides N.V.

GroenLeven B.V.

Kuwait Petroleum

Nuon / Vattenfall

ONE-Dyas B.V.

The Netherlands Petroleum Stockpiling Agency (COVA)




Van Kessel Olie B.V.

Varo Energy B.V.



VPR Energy

Wintershall Noordzee B.V.

Environment and planning Tier 2

Ploum has in-depth expertise in environment and planning law, especially issues concerning refineries and tank storage. Key clients include petroleum companies BP and Shell, as well as tank storage companies Vopak and Maasvlakte Olie Terminal. Maayke Maas-Cooymans and Alexandra Danopoulos lead the practice. Maas-Cooymans is assisting HKZ Devex with the tender procedure for the development of Hollandse Kust. Stephan F.J. Sluiter also advised on this matter.

Practice head(s):

Maayke Maas-Cooymans; Alexandra Danopoulos


Good connection and engagement to the position of the company. Excellent knowledge of applicable law, experienced in high exposure cases and know how dealing with authorities‘.

Stephan Sluiter is a pleasure to deal with. He has a lot of expertise and is able to translate the input of the business quickly and correctly in legal documents. He is sensitive in relationships of the business with competent authorities and always looking for more permanent solutions than going to court. Furthermore, he has a good sense of humour and he is modest‘.

The team is headed by Maayke Maas and Stephan Sluyter. Both are very capable and have extended knowledge of the relevant case law concerning environmental issues, especially in harbor related cases‘.

Alexandra Danopoulos – Very practical, good listener and knows how the business thinks‘.

Key clients



Dow Chemical

VPR Energy


Wintershall Noordzee B.V.

The Chemours Company


Koole Botlek Terminals

Zeeland Refinery N.V.

Data privacy and data protection Tier 3

At Ploum, Dennis Zieren leads a team along with senior partners Dorine ten Brink and Miranda Top-Sarneel. The team is valued for its in-depth knowledge of privacy issues and for providing 'sanity checks' for clients. Its expertise spans the notification and aftermath of major personal data breaches; advice on a variety of data privacy matters, such as inter-company data transfers inside and outside of the EEA, and data retention. This is combined with expertise in direct marketing, camera surveillance, and the use of personal data in the healthcare sector.

Practice head(s):

Dennis Zieren


‘The privacy team acts as an extended arm for privacy queries of our company. I can contact the team for in-depth privacy issues but also as a sparring partner for carrying out a sanity check.’

‘At Ploum they have a great deal of knowledge about data privacy and data protection. They know what  we do at our firm, so they know how to translate our questions about data privacy to our practice. They respond quickly to questions.’

‘They work in a team, so when one person is absent, another colleague takes over. I never have to wait long for a response. And they are always very friendly. Engaging any service provider, I expect them to deliver high quality and value. During this project with Ploum, I felt very comfortable with their level of support, input and advice given, also challenging me in a professional way.’

Key clients

Dura Vermeer

AVIA Nederland

Stichting Pameijer

MediaMarkt SaturnHolding BV


CentrientPharmaceuticals(previous : DSM SinochemPharmaceuticals)

Chiesi Pharmaceuticals


Vereniging voor Bakkerijen Zoetwaren



Unit4 Business SoftwareBV

Scheidt & BachmannNederland

JDE (Sara LeeCorporation)

Kober Kinderopvang

Kuwait Petroleum



Insurance Tier 3

Ploum's expertise is focused on health, safety and environmental issues, and it is a popular choice for clients in the chemical or construction sectors. The team primarily assists the insured parties, but also acts on behalf of insurance companies, brokerage companies and loss adjusters. The firm's other key area of strength is in the field of professional liability, particularly directors’ and officers’ liability. In recent highlights, practice head Natalie Vloemans led a team which represented construction consortium SAAone in a €15m insurance claim against several Dutch underwriters. Also recommended is Maurice Verhoeven.

Practice head(s):

Natalie Vloemans

Key clients

Koole Terminals Botlek (formerly known as Odfjell Terminals)







Suiker Unie



Media Markt


Commercial, corporate and M&a Tier 4

'Strongly rooted in Rotterdam but with an international outlook', Ploum is a highly recommended mid-sized firm, and is noted for its strong focus on the energy sector alongside expertise in the transport and logistics industries. 'Outstanding transactional lawyer' Tom Ensink heads up the team, while 'strong negotiator' Albert Wiggers acts for Dutch and international clients and private equity houses on a range of acquisitions and disposals. Stephan Sluijters is a key name for energy sector work, and junior partner Jeroen Terstegge is praised as a 'rising star'. The team has also seen notable growth with the recruitment of several corporate and acquisition finance specialists.

Practice head(s):

Tom Ensink


Everyone contributes their fair share, they are incredibly motivated and client oriented.’

Nick Hessels and Jeroen Terstegge are client focused, responsive, good to approach, keep to deadlines, good quality, well experienced, and good at drafting contracts.’

‘The client service is always high, as is the quality of the advice. The firm is especially strong in M&A work in the energy sector and has an excellent track record. Hands on, client driven and very easy to work with. Good value for money, excellent alternative to the expensive firms.’

‘Jeroen Terstegge is a rising star in the M&A/corporate/energy sector. Very pleasant to work with, dedicated and a very clever lawyer with in depth knowledge. He delivers great work and is able to understand complex issues and deliver clever solutions.’

‘Stephan Sluijters is very pleasant, fast thinking and an excellent deal maker and is on the ball.’

‘The firm is strongly rooted in Rotterdam, but has an international outlook. The team is very much no-nonsense, pragmatic, highly knowledgeable and generally very pleasant to work with or to have act as opposing counsel.’

‘Tom Ensink is an overall outstanding transactional lawyer, who has evidently more than mastered all phases and all aspects of an M&A transaction. He superbly handles cross-border transactions involving many parties, with different interests, be it (strategic) buyers/sellers, investors, banks, borrowers or partners. In addition, he is very down-to-earth, very accessible, always available.’

‘Stephan Sluijters is second to none in transactions in the energy sector, including transactions in the oil and gas industry. He is an excellent transactional lawyer as well. I particularly appreciate his sector expertise.’

‘Albert Wiggers is a solid transactional lawyer and a strong negotiator as well. His arrival has further strengthened the team. The corporate M&A team at Ploum are superb and stand out in the M&A market for their work.’

Key clients

ONE-Dyas Holdings B.V.



Eszet Bedrijven B.V.

BayWa r.e. renewable energy GmbH

CED Holding B.V.


ABN AMRO Energy Transition Fund B.V.

Dura Vermeer

Ecclesia Gruppe

Enghouse Systems Ltd.

Transports Vervaeke N.V.

Equinix Inc.





GroenLeven B.V.


Active Capital

James Fisher and Sons Plc

Dispute resolution: Commercial litigation Tier 4

Rotterdam-based Ploum is home to a dispute resolution team with good experience in a multitude of areas, including contractual and extra-contractual disputes, corporate litigation, insolvency-related matters, disputes in the customs and trade area, and product liability cases. Maurice Verhoeven has considerable expertise in professional liability.  The firm has seen significant expansion in 2019, with the arrival of Jikke Biermasz and Marijn van Tuijl from Kneppelhout & Korthals Advocaten, both of whom are experienced in customs and trade-related litigation.

Practice head(s):

Maurice Verhoeven

Key clients


Markel International Nederland B.V.

RPS Advies- en Ingenieursbureau B.V.

Deloitte Accountants B.V.

Peterson Control Union Group

Koole Tankstorage Botlek B.V. (formerly known as Odfjell Terminals (Rotterdam) B.V.

Allianz Global Corporate & Specialty

AIG Europe Limited, Netherlands

Libéma Group

Tui Nederland N.V.


SAAone B.V.

Employment Tier 4

Ploum's employment group has particular experience in the logistics and manufacturing sectors, with a strong base of clients instructing its Rotterdam office on employment matters. Founding partner Rutger Ploum is recommended for conflicts between employers and labour organisations such as trade unions or works councils, and co-heads the team along with Simon Tan. Senior associate Astrid van Toledo is a key contact for reorganisations, terms of employment, non-competition and advice regarding co-determination.

Practice head(s):

Rutger Ploum; Simon Tan


Ploum is a great asset for us in The Netherlands. They are efficient and business oriented

Simon Tan is a star in handling employment law matters. Fast, efficient, able to understand clients needs, focused and sharp.

Key clients




Unit 4


BDP Global

Rain Carbon, Inc




United Biscuits / Pladis /Verkade

Works Council of Standard Aer

Intellectual property: trade marks, copyrights and design rights Tier 4

Ploum routinely assists its clients with anti-counterfeiting, border seizures and parallel trade cases. The firm handles pan-EMEA litigation in a range of sectors including automotive, technology, luxury goods, food and beverage, and tobacco. Practice head Willem Leppink is 'very pragmatic' and thinks 'out of the box'; he is assisting Western Digital with multi-jurisdictional counterfeit and parallel trade cases connected to online market places.

Practice head(s):

Willem Leppink


I work with Willem and Sabin. They are knowledgeable and prompt. We are a tech company so we appreciate the more relaxed and friendly approach‘.

All lawyers of the IP section work well together and can take care of each other in case of absence, so quick advice is possible. Costs are in proportion to the work / experience and practical advice is provided (also legible for non-lawyers)‘.

Willem Leppink: Reachable 24/7, very pragmatic and commercial thinking lawyer taking into account the best interests of the company. Has a lot of ready knowledge and also thinks out of the box. Acts as a team player and not as an external advisor‘.

Arlette Molenaar: Reachable 24/7, very pragmatic and commercial thinking lawyer taking into account the interests of the company. Has a lot of ready knowledge and always takes into account the costs and tries to reduce these as much as possible‘.

Key clients

Western Digital




Japan Tobacco





London Rubber Company


Medical Pet Shirts

Under Armour




The firm: Founded in 1995 as one of the first break-away firms in the Netherlands, Ploum is not an average law firm. Its clients will confirm that it is significantly different. The firms strives to support businesses in achieving their objectives. Combining know-how and practical experience to its clients’ advantage is its talent.

The firm focuses on business clients, including national and international organisations in all shapes and sizes – from small businesses to local government bodies, from listed companies to national government. The 60-plus lawyers at Ploum understand what business is about and know what is important. The firm focuses on what matters to business and helping clients achieve their goals swiftly and smoothly. Solving real puzzles is what drives Ploum. Within the traditional world of the legal professions, the firm sets itself apart by analysing issues with a fresh and open mind and providing solutions, not advice. Its reasonable rates, in addition to this pragmatic way of working, mean clients find Ploum a perfect alternative to bigger firms.

Areas of practice: Ploum has all the relevant legal knowledge and experience to be able to advise organizations.

Banking and finance: the team advises on complex financing arrangements as well as on mainstream financing arrangements, both on behalf of issuers and debtors. In addition, Ploum advises on financial services and regulatory matters.

Corporate and M&A: Ploum has an experienced M&A team consisting of seven partners (including notaries) and a pool of experienced associates. We assist buyers and sellers on a daily basis, in deals in a wide variety of sectors, and advise on the whole M&A process. We also regularly act for private equity funds and other investors.

Real estate: our lawyers and civil-law notaries are specialized in all matters relating to real estate. We advise on any property-related project, and will be able to identify the various legal points of attention. Our sole aim in this respect is to find a feasible solution for each organization –  efficiently and with an eye on the costs

Employment: our specialists will advise on every imaginable aspect of individual and collective employment-law matters. Examples include collective labour agreements, appointment or dismissal of directors under the articles of association, strikes or amendments to pension schemes. Our lawyers can also help in the event of reorganisation, restructuring, mergers, takeovers, outsourcing or insourcing.

Administrative, environment and planning: at Ploum, our specialists in general administrative law will be happy to advise and assist in objection and appeal proceedings relating to administrative law and covering a wide variety of matters, including the granting of subsidies, enforcement, public access to government information, government liability and, of course, environmental law. In addition to our hands-on approach, we are especially aware of the political and administrative context in matters pertaining to administrative law.

Fraud and White-collar crime: do you require advice and legal assistance for your company, management or staff in criminal proceedings relating to the environment, industrial and work place accidents, road and water transport, fraud, duties to report, internal investigations and compliance? At Ploum, our team of white-collar crime lawyers has in-depth experience in advising and assisting companies in sectors such as construction, chemistry, petrochemistry, industrial manufacture, IT and transport.

Intellectual property: at Ploum, our specialists can advise and assist in protecting your intellectual property rights. For example, we can file your trademarks and designs with the official authorities worldwide and we can also investigate a trademark’s national and international availability.

Insurance and liability: at Ploum we have in-depth knowledge of insurance practice and we provide advice and assistance on all aspects of insurance: from financial supervision to developing insurance products and from contractual spreading of liability risks to settling claims. Our clients in this field include insurance companies, intermediaries, insured companies, government authorities and experts.

Restructuring and insolvency: If your company or organisation is facing considerable financial problems, either existing or imminent, you – as a director, supervisory director, shareholder or bank – have urgent need of an advisor that focuses on providing some breathing space. At Ploum, our specialists will provide you with fast and effective assistance. We will draw up an action plan – in consultation with you – for one or more of the following, depending on the situation your company is facing.

Department Name Email Telephone
Administrative, environmental law and spatial planning Maayke Maas-Cooymans
Asset finance Stan Commissaris
Asset finance Jolande van Loon
Asset finance and structured finance Lucas Lustermans
Asset finance and structured finance Matthijs Bolkenstein
Banking and finance Lucas Lustermans
Banking and finance Matthijs Bolkenstein
Capital Markets Matthijs Bolkenstein
Commercial contracts Dorine ten Brink
Commercial contracts Dennis Zieren
Commercial litigation and arbitration Dorine ten Brink
Commercial litigation and arbitration Maurice Verhoeven
Financial Regulatory/Supervision
Real estate Stan Commissaris
Real estate Anton van den Heuvel
Real estate Stephan Sluiter
Competition and EU Michel Jacobs
Corporate and M&A Tom Ensink
Corporate and M&A Nick Hessels
Corporate and M&A Stephan Sluijters
Corporate and M&A Albert Wiggers
Fraud and white-collar crime Jouko Barensen
Corporate recovery Vincent Terlouw
Energy Stephan Sluijters
Energy Jolande van Loon
Energy Maayke Maas-Cooymans
Employment and co-determination Rutger Ploum
Estate planning Jolande van Loon
Care Dennis Zieren
Care Michel Jacobs
Care Stan Commissaris
IT and privacy Dorine ten Brink
IT and privacy Dennis Zieren
Insurance Natalie Vloemans
Insurance Maurice Verhoeven
Intellectual property and marketing Willem Leppink
Joint ventures Nick Hessels
Joint ventures Jeroen Terstegge
Procurement Dennis Zieren
Photo Name Position Profile
Mr Jouko Barensen  photo Mr Jouko Barensen
Mrs Jikke Biermasz  photo Mrs Jikke Biermasz
Mr Matthijs Bolkenstein  photo Mr Matthijs Bolkenstein
Mr Stan Commissaris  photo Mr Stan Commissaris
Mrs Alexandra Danopoulos  photo Mrs Alexandra Danopoulos
Mr Tom Ensink  photo Mr Tom Ensink
Mr Jaap Feenstra  photo Mr Jaap Feenstra
Mr Nick Hessels  photo Mr Nick Hessels
Mr Michel Jacobs  photo Mr Michel Jacobs
Mr Willem Leppink  photo Mr Willem Leppink
Mr Lucas Lustermans  photo Mr Lucas Lustermans
Mrs Maayke Maas-Cooymans  photo Mrs Maayke Maas-Cooymans
Mrs Deborah Nizamoeddin  photo Mrs Deborah Nizamoeddin
Mr Rutger Ploum  photo Mr Rutger Ploum
Mr Stephan Sluijters  photo Mr Stephan Sluijters
Mr Stephan F.J. Sluiter  photo Mr Stephan F.J. Sluiter
 Simon Tan photo Simon Tan
Mr Vincent Terlouw  photo Mr Vincent Terlouw
Mr Jeroen Terstegge  photo Mr Jeroen Terstegge
 Sabin Tigu photo Sabin Tigu
 Astrid Van Toledo photo Astrid Van Toledo
Mr Maurice Verhoeven  photo Mr Maurice Verhoeven
Mrs Natalie Vloemans  photo Mrs Natalie Vloemans
Mr Albert Wiggers  photo Mr Albert Wiggers
Mr Dennis Zieren  photo Mr Dennis Zieren
Mrs Dorine ten Brink  photo Mrs Dorine ten Brink
Mrs Jolande van Loon  photo Mrs Jolande van Loon
Mr Marijn van Tuijl  photo Mr Marijn van Tuijl
Mr Anton van den Heuvel  photo Mr Anton van den Heuvel
Number of lawyers : 60
Contact : Tom Ensink (