Majority of Boskalis shareholders elects stock dividend

Papendrecht, 10 June 2009 Royal Boskalis Westminster N.V. announces that almost two thirds (64.8 percent) of the shareholders have elected for a stock dividend distributed in the form of ordinary shares. In connection with this, Royal Boskalis Westminster N.V. has issued 3,832,322 new shares (with a nominal value of EUR 0.80 each) bringing the total number of outstanding shares to 89,631,683. This is an English translation of the Dutch press release. In the event of any disparity between the Dutch original and this translation, the Dutch text will prevail. Royal Boskalis Westminster N.V. is a leading global services provider operating in the dredging, maritime infrastructure and maritime services sectors. Boskalis provides creative and innovative all-round solutions to infrastructural challenges in the maritime, coastal and delta regions of the world including the construction and maintenance of ports and waterways, land reclamation, coastal defense and riverbank protection. The company holds important home market positions in and outside of Europe and targets all market segments in the dredging industry. It also has positions in strategic partnerships in the Middle East (Archirodon) and in offshore services (Lamnalco). Boskalis has a versatile fleet of over 300 units and operates in over 50 countries across five continents. Including its share in partnerships, Boskalis has approximately 10,000 employees. For further information please contact: Martijn L.D. Schuttevâer Director of Investor Relations & Corporate Communications Telephone: +31 78 69 69 822 / +31 6 200 10 232 Telefax: +31 78 69 69 020 E-mail: m.l.schuttevaer@boskalis.nl This press release can also be found on our website www.boskalis.com This announcement was originally distributed by Hugin. The issuer is solely responsible for the content of this announcement.