GlaxoSmithKline plc : Director/PDMR Shareholding

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

I give below details of changes in the interests of Directors, Persons Discharging Managerial Responsibility or Connected Persons in the Ordinary shares of GlaxoSmithKline plc in respect of the under-mentioned persons arising from the purchase of Ordinary shares at a price of 1435.17 pence per Ordinary share on 11 January 2012 through the Company's Share Reward Plan ("the Plan"):

Sir Andrew Witty	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)
Mr S Dingemans	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)
Mr S M Bicknell	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)
Mr E J Gray	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)
Mr D S Redfern	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)
Ms C Thomas	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)
Mr P C Thomson	Acquisition of 7 Ordinary shares under the personal contribution element of the Plan Acquisition of 7 Ordinary shares under the matching element of the Plan (Company contribution)
Dr P J T Vallance	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)
Mrs V A Whyte	Acquisition of 9 Ordinary shares under the personal contribution element of the Plan
	Acquisition of 9 Ordinary shares under the matching element of the Plan (Company contribution)

The Company and the above-mentioned persons were advised of this information on 12 January 2012.

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

V A Whyte

Company Secretary

12 January 2012