Arnold & Siedsma

Arnold & Siedsma company information, Employees & Contact Information

Updated June 2026

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Arnold & Siedsma is a Legal Services company and founded in 1920. It has approximately 154 employees on record. Contact data was last refreshed in June 2026. Find Arnold & Siedsma's verified employee emails, phone numbers, headquarters address, and key decision makers below.

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Arnold & Siedsma has a unique and broad expertise protecting intellectual property. We have been protecting new products, processes, designs and trademarks for 100 years and we pride ourselves on the short and personal lines of communication between our clients and our patent attorneys. We provide the full service of intellectual property rights in one convenient stop. For example, we can take care of drawing up licenses or other agreements, registering domain names, provident the best patent protection for your idea, advising on trade names and copyright. We can bring a court action in case of infringement of your rights in cooperation with specialised IP lawyers in order to guarantee the best legal protection of your trademark, design or patent.

Company Details

Employees
154
Founded
1920
Address
Bezuidenhoutseweg 57, Den Haag,zh 2594 Ac,netherlands
Industry
Legal Services
NAICS
Legal Services
Offices of Notaries
Other Legal Services
Title Abstract and Settlement Offices
All Other Legal Services
HQ
Den Haag, ZH
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News

Dutch firm Arnold & Siedsma joins private-equity-backed IP group Rouse - JUVE Patent

Dutch firm Arnold & Siedsma joins private-equity-backed IP group Rouse JUVE Patent

Exclusive: Rouse joins forces with Arnold & Siedsma - Managing Intellectual Property

Exclusive: Rouse joins forces with Arnold & Siedsma Managing Intellectual Property

Benelux Trademark Attorney Firm of the Year: Arnold & Siedsma - IAM Media

Benelux Trademark Attorney Firm of the Year: Arnold & Siedsma IAM Media

Arnold & Siedsma becomes fifth member of the EPLN network - JUVE Patent

Arnold & Siedsma becomes fifth member of the EPLN network JUVE Patent

INTA visits Washington DC; first GI case in Malaysia; Rouse merges with Arnold & Siedsma – news digest - World Trademark Review

INTA visits Washington DC; first GI case in Malaysia; Rouse merges with Arnold & Siedsma – news digest World Trademark Review

Five minutes with…Loes van den Winkel, Arnold & Siedsma - Managing Intellectual Property

Five minutes with…Loes van den Winkel, Arnold & Siedsma Managing Intellectual Property

Rouse and Arnold & Siedsma - Investec

Rouse and Arnold & Siedsma Investec

Arnold & Siedsma merges with Belgian patent firm - JUVE Patent

Arnold & Siedsma merges with Belgian patent firm JUVE Patent

‘Too many IP firms are standing still’: Rouse outlines acquisitions drive - Managing Intellectual Property

‘Too many IP firms are standing still’: Rouse outlines acquisitions drive Managing Intellectual Property

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