As a result of our listing on Euronext Amsterdam, ARCADIS is by virtue of the Securities Transactions Act 1995, 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:

Regulation Concerning Insider Information ARCADIS N.V. (doc)
Explanatory Notes on Statutory Rules on Insider Information (doc)
Supplement 1 to the Regulation Insider Information (doc)
ANNEX to ARCADIS N.V. Regulation 2005 concerning the holding and effecting of transactions in securities (doc)

Closed periods in 2006:
6 January up until and including 5 March 2006
11 April up until and including 8 May 2006
5 July up until and including 8 August 2006
11 October up until and including 14 November 2006

Closed periods in 2007:
5 January up until and including 4 March 2007
10 April up until and including 7 May 2007
4 July up until and including 7 August 2007
11 October up until and including 14 November 2007