Director/PDMR Shareholding

GlaxoSmithKline PLC
25 April 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 25 April 2008 of an increase in their
interests in Ordinary shares at a price of £11.01 per share following the
re-investment of the dividend paid to shareholders on 10 April 2008:-


          Dr M M Slaoui                      319
          Mr M Dunoyer                       154
          Mr D Learmouth                      27
          Dr D Pulman                        235
          Mr A P Witty                       143

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


S M Bicknell
Company Secretary


25 April 2008


                      This information is provided by RNS
            The company news service from the London Stock Exchange  ND
RDSXELFLVZBEBBL