Director/PDMR Shareholding

GlaxoSmithKline PLC
23 January 2008




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


The Administrators of the GlaxoSmithKline Annual Investment Plan notified the
Company and the under mentioned persons on 23 January 2008 of an increase in
their interests in Ordinary shares at a price of £13.17 per share following the
re-investment of the dividend paid to shareholders on 10 January 2008:-

     Dr M M Slaoui                                          213
     Mr R M Bondy                                           279
     Mr M Dunoyer                                           104
     Mr D Learmouth                                         19
     Dr D Pulman                                            158
     Mr A P Witty                                           97

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


S M Bicknell
Company Secretary

23 January 2008


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