Director/PDMR Shareholding

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

The Administrators of the GlaxoSmithKline Performance Share Plan notified the Company and the under-mentioned person on 11 October 2011 of an increase in his interests in Ordinary share ADRs at a price of $42.37 per ADR following the re-investment of the dividend paid to shareholders on 6 October 2011.

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

V A Whyte

Company Secretary

11 October 2011