As a result of our listing on Euronext Amsterdam, ARCADIS is by virtue of the Act on Financial Supervision, obliged to make an arrangement to prevent the use of insider knowledge by its directors and employees, as well as those so-called "insiders". The rules are stated in the documents below:

• ARCADIS N.V. Regulations 2007 concerning the holding of and effecting transactions in shares and certain other securities (doc)
• Explanatory Notes on Statutory Rules on Insider Information (doc)
• Supplement 1, to the ARCADIS N.V. Regulations 2007 (doc)
• Annex to the ARCADIS N.V. Regulations 2007 (doc)

Closed periods in 2008:
3 January up until and including 2 March 2008
9 April up until and including 6 May 2008
10 July up until and including 6 August 2008
15 October up until and including 11 November 2008

Closed periods in 2009:
5 January up until and including 1 March 2009
9 April up until and including 6 May 2009
8 July up until and including 4 August 2009
14 October up until and including 10 November 2009