Director/PDMR Shareholding

GlaxoSmithKline PLC
11 April 2008



   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 £11.06 per Ordinary share on
10 April 2008 through the Company's ShareReward Plan ("the Plan") which the
under-mentioned persons entered on 5 October 2001:


Mr J S Heslop        Acquisition of 23 Ordinary shares under the Dividend 
                     Reinvestment element of the Plan


Mr E J Gray          Acquisition of 23 Ordinary shares under the Dividend 
                     Reinvestment element of the Plan


Mr D Learmouth       Acquisition of 23 Ordinary shares under the Dividend 
                     Reinvestment element of the Plan


Dr D Pulman          Acquisition of 11 Ordinary shares under the Dividend 
                     Reinvestment element of the Plan


Mr C Viehbacher      Acquisition of 4 Ordinary shares under the Dividend 
                     Reinvestment element of the Plan


Mr A P Witty         Acquisition of 23 Ordinary shares under the Dividend 
                     Reinvestment element of the Plan



The Company and the above-mentioned persons were advised of this information on
11 April 2008.

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



S M Bicknell
Company Secretary


11 April 2008




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