Director/PDMR Shareholding

GlaxoSmithKline PLC
14 January 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 £13.90 per Ordinary share on
10 January 2008 through the Company's ShareReward Plan ("the Plan") which the
under mentioned persons entered on 5 October 2001:


Mr R M Bondy                   Acquisition of 9 Ordinary shares under the partnership element of
                               the Plan (personal contribution)

                               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 partnership element of
                               the Plan (personal contribution)

                               Acquisition of 9 Ordinary shares under the matching element of the
                               Plan (company contribution)

Mr J S Heslop                  Acquisition of 9 Ordinary shares under the partnership element of
                               the Plan (personal contribution)

                               Acquisition of 9 Ordinary shares under the matching element of the
                               Plan (company contribution)

Mr D Learmouth                 Acquisition of 9 Ordinary shares under the partnership element of
                               the Plan (personal contribution)

                               Acquisition of 9 Ordinary shares under the matching element of the
                               Plan (company contribution)

Mr A P Witty                   Acquisition of 9 Ordinary shares under the partnership element of
                               the Plan (personal contribution)

                               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
11 January 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


14 January 2008


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