Arcadis NV — M&A Activity 2011

Apr 1, 2011

ARCADIS NV Gustav Mahlerplein 97-103 P.O. Box 7895 1008 AB Amsterdam The Netherlands Tel +31 20 2011 011 www.arcadis.com

PRESS RELEASE

ARCADIS SELLS FACILITY MANAGEMENT ACTIVITIES TO ASITO DIENSTENGROEP

April 1, 2011 – ARCADIS (NYSE EURONEXT: ARCAD), the international consultancy, design, engineering and management services company, announced today that ARCADIS and Carillion have signed an agreement to sell their respective 50% stakes in the joint venture ARCADIS AQUMEN Facility Management B.V. to Asito Dienstengroep for an undisclosed amount. For ARCADIS the decision to sell stems from a review of its portfolio of activities in conjunction with the recently published strategy update. It is expected that the transaction will be closed in the second quarter of 2011 upon gaining regulatory approvals and fulfilling some other standard deal conditions.

The joint venture ARCADIS AQUMEN Facility Management was established in 2003 between ARCADIS and U.K.-based support services specialist Mowlem Aqumen (now Carillion) to capture the Dutch and later the European facility management market. After winning a series of 3-5 year contracts with clients in the industrial, banking services, real estate and transportation sectors, ARCADIS AQUMEN became the largest single provider of independent facility management services in the Netherlands and a fast growing player in Belgium.

CEO Harrie Noy of ARCADIS about the divestment: "ARCADIS' portfolio of services in buildings has strongly evolved in the direction of high value added activities such as world class design and program and project management. The synergies between these activities and our facility management capabilities were limited. We therefore decided to focus on our core business to achieve the growth we have projected in our recently updated strategy. In addition, we believe that for the development of ARCADIS AQUMEN and its staff, becoming part of Asito Dienstengroep offers a lot of upside."

For more information, please contact Joost Slooten of ARCADIS at +31-202011083 or outside office hours at +31-627061880 or e-mail joost.slooten@arcadis.com

About ARCADIS:

ARCADIS is an international company providing consultancy, design, engineering and management services in infrastructure, water, environment and buildings. We enhance mobility, sustainability and quality of life by creating balance in the built and natural environment. ARCADIS develops, designs, implements, maintains and operates projects for companies and governments. With 16,000 employees and over € 2 billion in revenues, the company has an extensive international network supported by strong local market positions. ARCADIS supports UN-HABITAT with knowledge and expertise to improve the quality of life in rapidly growing cities around the world. Visit us at: www.arcadis.com.