GlaxoSmithKline plc

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

I give below details of changes in the interests of the Connected Persons of a Director in GlaxoSmithKline plc, as a result of awards made under the GlaxoSmithKline 2009 Performance Share Plan on 11 February 2016 as follows:

* Denotes an Executive Director

The closing price of an ADS on 11 February 2016 was $39.15.

The Company and the above-mentioned individual 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)(c).

Victoria A Whyte

Company Secretary

12 February 2016