Investor contacts

GlaxoSmithKline Investor Relations

For institutional investment questions only:

One Franklin Plaza

PO Box 7929

Philadelphia PA 19101

Tel: +1 888 825 5249 (toll-free)

Tel: +1 215 751 4638

Fax: +1 919 315 3344

Annual Report order line

+1 888 825 5249

Corporate investors site

Updated June 18, 2007