Director/PDMR Shareholding

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

I give below details of a change in the interests of a Person Discharging Managerial Responsibility in Ordinary Shares of GlaxoSmithKline plc on 25 March 2013:

Mr S M Bicknell The purchase of 499 Ordinary Shares in GlaxoSmithKline plc at a price of 1523.45 pence per Ordinary Share.

The Company and the above mentioned individual were advised of this transaction on 25 March 2013.

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

V A Whyte

Company Secretary

25 March 2013