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 10 January 2012 of an increase in his interests in Ordinary share ADRs at a price of $46.13 per ADR following the re-investment of the dividend paid to shareholders on 5 January 2012.

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

V A Whyte

Company Secretary

10 January 2012