Pursuant to article 5:25f paragraph 2 of the Netherlands Financial Supervision Act (FSA), Grontmij N.V. is required to make this document generally available containing information about or referring to the information that was made generally available during the preceding twelve months (the “Annual Document”).

The following information was published or made generally available by Grontmij N.V. on its corporate website www.grontmij.com in the preceding twelve months:

• Annual Report 2010
• Full year, half year and quarterly results 2010
• Financial Calendar
• Corporate Press Releases
• Information regarding the general and extraordinary meetings of holders of ordinary shares
• Information regarding the meeting of holders of depositary receipts for ordinary shares
• Shareholder information

Please be referred to the public database that is maintained by the Netherlands Authority for the Financial Markets for notifications:

• concerning the company’s issued share capital
• made by members of the Executive Board and Supervisory Board pursuant to section 5:48 FSA
• concerning insider transactions pursuant to section 5:60 F

Please be referred to the public trade register that is maintained by the Netherlands Chamber of Commerce for notifications concerning amongst other things:

• the appointment or dismissal of members of the Executive Board and Supervisory Board,
• the company’s capital structure,
• the company’s articles of association.

This Annual Document was filed with the Netherlands Authority for the Financial Markets on Monday 18 April 2011.