Royal BAM Group nv: Announcement exchange ratio

Bunnik, The Netherlands, 13 May 2011 - Further to the announcement of 20 April 2011 on the payment of Royal BAM Group nv final dividend for the 2010 financial year, the number of dividend rights providing an entitlement to one ordinary share of Royal BAM Group nv (the exchange ratio) has been set at 166.

This is based on a share price of €5.2269; the average price, weighted by volume, of all Koninklijke BAM Groep nv shares traded on Euronext Amsterdam by NYSE Euronext during the period from 11 May 2011 up to and including 13 May 2011. This represents 1/166 Royal BAM Group nv share and a value of €0.0315, and is therefore almost 5% more than the value of the cash dividend of €0.03 per ordinary share of Royal BAM Group nv.

A request to admit the approximately 730.110 new ordinary shares for admission to trading on Euronext Amsterdam will be made pursuant to article 5:4 sub e of the Financial Markets Supervision Act (Wet op het financieel toezicht).

The payment of the cash dividend or transfer of shares will take place as from 16 May 2011.

Paying agent: The Royal Bank of Scotland N.V. (telephone: +31 (0)20 464 37 07, fax +31 (0)20 464 17 07, e-mail: corporate.actions@rbs.com).