Tessenderlo Group : Convocation Extraordinary Shareholders' Meeting

September 26th, 2014

Dear Madam, Dear Sir,

Please find enclosed the convocation (with the agenda and proposals of resolution) for the extraordinary shareholders' meeting of Tessenderlo Chemie SA of 29 October 2014.

We also enclose herewith a proxy for the extraordinary shareholders' meeting, to be used in case you wish to be represented at the meeting by a proxy holder.

Should you decide to attend the meeting or should you wish to be represented by a proxy holder, we kindly ask you to follow the instructions mentioned in the convocation letter herewith enclosed.

In the event this meeting does not reach the required attendance quorum, a second extraordinary shareholders' meeting will be held on 18 November 2014 at 11h00, at the location as indicated in the respective convocation, to deliberate and to resolve on the same agenda.

Additional information relating to this meeting can be found on our website : http://www.tessenderlo.com/investors/information_for_the_shareholder/general_meeting/

Please note that the total number of shares and voting rights at the date of the convocation is 31,771,463 (thirty one million seven hundred and seventy one thousand four hundred and sixty three).

Yours faithfully,