Tessenderlo Group nv — Board/Management Information 2011

May 11, 2011

Brussels, June 7th Press release , 2011

Changes within the Board of Directors of Tessenderlo Chemie

The Annual General Meeting of Tessenderlo Chemie NV of 7 June 2011 approved the nomination of the following Directors as proposed by the Board of Directors:

• Renewal of mandate:

• − Mr. Karel Vinck as independent director for a period of four years.
• − Mr. Thierry Piessevaux as independent director for a period of four years.
• − Mr. Baudouin Michiels as independent director for a period of four years.
• − Mr. François Schwartz as director for a period of four years.

• New mandates:

• − Mrs. Dominique Damon as independent director for a period of four years.
• − Mr. Philippe Coens as independent director for a period of four years.

For their curriculum vitae see: www.tessenderlogroup.com – Tessenderlo Group – Governance – Board of Directors - Composition

The mandates of Mr. Jaak Gabriëls, Mr. Paul de Meester and Mr. Bernard Pache have come to an end in June 2011.

Tessenderlo Group is an international chemicals company with over 100 locations worldwide. More than 8,000 people work for the group. The group is a world and European leader in most of its product areas with a consolidated revenue totaling 2.4 billion EUR in 2010. Tessenderlo Chemie NV is listed on Eurolist by Euronext Brussels and is part of Next 150 and BEL Mid indices. Financial News wires: Bloomberg: TESB BB – Reuters: TesBt.BR – Datastream: B:Tes

Media Relations Investor Relations Mrs. Kathleen IWENS Mr. Philip LUDWIG +32 (0) 478 664 555 +32 2 639 16 58

Group Communication Head of Investor Relations

Web site: http://www.tessenderlogroup.com

This press release is available in Dutch, English and French on the corporate web site www.tessenderlogroup.com - under 'News & Media'.