Director/PDMR Shareholding

GlaxoSmithKline plc

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

In accordance with DTR 3.1.4R(1)(a) I give below details of changes in the interests of Dr M M Slaoui, a Director, in the Ordinary Shares of GlaxoSmithKline plc (the "Company"):

The exercise of options over 26,800 Ordinary Shares on 27 October 2014, granted on 2 December 2004 under the GlaxoSmithKline Share Option Plan at a price of £11.23 per share, and the sale of 26,800 Ordinary Shares at a price of £14.16 per share on 27 October 2014.

The Company was advised of the transaction on 27 October 2014.

V A Whyte

Company Secretary

27 October 2014