Interest in shares in Addex P

RNS Number : 9455H

GlaxoSmithKline PLC

11 November 2008

Notifiable Share Interest in Addex Pharmaceuticals Limited

GlaxoSmithKline plc (GSK) announces that on 11 November 2008 SR One, Limited, a wholly owned US-registered subsidiary of GSK, increased to 5.0% its interest in the issued common share capital of Addex Pharmaceuticals Limited ("Addex"), a biopharmaceuticals company located in Switzerland and whose shares are traded on the SWX Swiss Exchange. GSK's interest, which is held entirely by SR One, Limited, now comprises 293,125 common shares of Addex.

This increased interest became disclosable under the rules of the SWX Swiss Exchange upon reaching 5% of the issued share capital of Addex, and an announcement regarding this increased holding is therefore due to be made to the SWX Swiss Exchange on 11 November 2008. The additional 5,496 common shares in Addex, which increased GSK's interest above the 5% disclosable threshold and to its present holding, were acquired in the market for cash at a price of CHF 34.90 per share.