Director/PDMR Shareholding

Notification of Transactions of Directors, Persons Discharging Managerial Responsibility or Connected Persons

The Administrators of the GlaxoSmithKline US Deferred Performance Share Plan notified the Company and the under-mentioned person on 8 January 2013 of the following increase in his interests in American Depositary Shares (ADSs) at a price of $43.98 per ADS following the re-investment of the dividend paid to shareholders on 3 January 2013.

This notification relates to a transaction notified in accordance with Disclosure and Transparency Rule 3.1.4R(1)(a).

V A Whyte

Company Secretary

9 January 2013