Investor contacts

GlaxoSmithKline Investor Relations

For institutional investment questions only:

5 Crescent Drive
Philadelphia, PA 19112

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 March 27, 2013