Director/PDMR Shareholding

GlaxoSmithKline PLC
12 February 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 £10.95 per Ordinary share on
11 February 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 11 Ordinary shares under the partnership 
                    element of the Plan (personal contribution)


                   Acquisition of 11 Ordinary shares under the matching element 
                   of the Plan (Company contribution)


Mr R M Bondy       Acquisition of 11 Ordinary shares under the partnership 
                   element of the Plan (personal contribution)


                   Acquisition of 11 Ordinary shares under the matching element 
                   of the Plan (Company contribution)


Mr E J Gray        Acquisition of 11 Ordinary shares under the partnership 
                   element of the Plan (personal contribution)


                   Acquisition of 11 Ordinary shares under the matching element 
                   of the Plan (Company contribution)


Mr D Learmouth     Acquisition of 11 Ordinary shares under the partnership 
                   element of the Plan (personal contribution)


                   Acquisition of 11 Ordinary shares under the matching element 
                   of the Plan (Company contribution)


Mr A P Witty       Acquisition of 11 Ordinary shares under the partnership 
                   element of the Plan (personal contribution)


                   Acquisition of 11 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 February 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



12 February 2008


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