Message from the Chair

2025 was a more challenging year for Arcadis, with growth slowing as a result of delays in the start of several larger client projects and an increasingly uncertain geopolitical environment. Even so, the longer-term prospects for the end markets Arcadis serves remain robust. Rising demand for energy security, improved infrastructure resilience, data centers, and advanced water-management solutions continues to create important opportunities for Arcadis.

In 2025, Arcadis celebrated significant project achievements, including the Fraser River Tunnel project in Canada, the Calcasieu River Bridge in the US, as well as the decommissioning of the NAM gas fields in the Netherlands and a large project for pharmaceutical company Lilly in the US. We were also impressed by the consistent excellence in project delivery demonstrated across the business, including the Zuidasdok project in Amsterdam, through our participation in IBZ. The exceptional talent of Arcadians around the world continues to drive smart, sustainable solutions for its clients every day.

For 2025, the Supervisory Board maintained three principal areas of focus, which will also remain our priorities for 2026:

1. People

2. Clients

3. Technology

Throughout our scheduled meetings in 2025, we consistently revisited these priorities to assess progress and ensure alignment with Arcadis’ long-term strategic ambitions.

On the topic of People, our focus centered on building a Skills Powered Organization, which will significantly enhance our ability to match the experience and capabilities of Arcadians across the globe to the projects that need them most. With the support of external advisors, we also dedicated substantial time to senior leadership development and succession planning. The Supervisory Board led the processes for the recruitment of Simon Crowe, who joined Arcadis as Chief Financial Officer in September, and for the proposed appointment of Heather Polinsky as our new CEO.

Regarding Clients, we concentrated on prioritizing the key global growth sectors that offer the greatest potential for Arcadis and on strengthening the focus and effectiveness of the company's client coverage within those sectors.

In the area of Technology, our ongoing priority is the standardization and automation of internal processes, empowering Arcadians and enabling them to devote more of their time to clients and project delivery. Arcadis will continue to take a prudent, evidence-based approach to artificial intelligence investments, focusing only on solutions that demonstrably add value to the business.

In the latter part of the year, we also devoted considerable attention to the simplification and streamlining of Arcadis’ global organization. We expect these actions to become visible during 2026.

In July, we welcomed Robert Swaak to the Supervisory Board. Robert will assume the role of Chair of the Audit and Risk Committee from Deanna Goodwin, who retires from the Supervisory Board in May 2026 after ten years of dedicated service. I would like to express my sincere thanks to Deanna for her invaluable contribution during her tenure.

In December 2025, the Supervisory Board nominated Heather Polinsky to succeed Alan Brookes as Chief Executive Officer of Arcadis as of 1 March 2026, with her formal appointment by the shareholders scheduled for 20 May 2026. We are very grateful to Alan for his people and client focus throughout his 25-year career, and his leadership as CEO during a period of transition at Arcadis. We are very pleased that our succession planning processes brought forward an internal candidate to take over from Alan. Heather Polinsky is an experienced and highly capable leader who has run some of Arcadis' largest and most successful businesses.

2025 marked my final year as Chair, and I will hand over my responsibilities to Peter de Wit at the annual General Meeting in May 2026.

In closing, my colleagues and I would like to extend our heartfelt thanks to all Arcadians for the outstanding work they do every day in service of the company's clients and in improving quality of life around the world.

Michiel Lap, Chair

On behalf of the Supervisory Board