GlaxoSmithKline plc

 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 (PDMR) in the Ordinary Shares of GlaxoSmithKline plc, as a result of awards made under the GlaxoSmithKline 2009 Performance Share Plan on 11 February 2016 as follows:

Vesting of the award made under the Performance Share Plan is subject to meeting performance criteria over a three year period.

The closing price of an Ordinary Share on 11 February 2016 was £13.45.

The Company and the Person Discharging Managerial Responsibility were advised of this transaction on 12 February 2016.

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

Victoria A Whyte

Company Secretary

12 February 2016