Invitation: Conference call

May 19, 2006

It is with great pleasure that we invite you to UCB’s conference call on Monday May 22, 2006, which will take place at DDW in Los Angeles at
9.00 AM (PST) / 12.00 AM (EST) / 05.00 PM (GMT) / 06.00 PM (CET).

Olav Hellebo, UCB’s President of Inflammation Operations, will present an update on CIMZIA™ in the treatment of Crohn’s disease followed by a Question and Answer session.

Olav Hellebo, will be accompanied by David Mason, Vice President, Head of Clinical Operations (Gastroenterology & Rheumatology) and Jean-Christophe Donck, Vice President Corporate Communications and Investor Relations.

Dial in details for conference call
May 22, 2006 at 09.00 AM (PST) / 12.00 AM (EST) / 05.00 PM (GMT) / 06.00 PM (CET)

Live conference call dial in:

* Belgium: 080074215
* UK: 08009174860
* US: (800) 374-1207
* Int’l: +1 (706) 634-5011 (long distance)

A replay of the conference will be available for 10 days on our website.

Webcast link to access slide kit

http://www.ucb-group.com

Venue for participants who wish to attend the conference call live at DDW
May 22, 2006 at 09.00 AM (PST)

Wilshire Grand Hotel Los Angeles
Meeting room Mulholland (Ballroom level)
930 Wilshire Blvd. - Los Angeles, CA 90017
Telephone : (213) 688-7777 Fax : (213) 612-3989

Further information and registration

May we kindly ask you to complete the respective attached registration form and fax it back to us today. You may also register by returning the completed registration form by email to:

Isabelle Ghellynck
IR Events Coordinator, Corporate Communications
Tel.: +32 2 559 95 88
Fax: +32.2.559.9571
Isabelle.Ghellynck@UCB-Group.com

Contact Information

Isabelle Ghellynck

IR Events Coordinator, Corporate Communications

UCB

Contact via E-mail