Director/PDMR Shareholding

GlaxoSmithKline PLC
14 April 2008



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


I give below details of an increase in interests in the Ordinary shares of
GlaxoSmithKline plc in respect of the personal holdings of the under-mentioned
persons at a price of £11.07 per Ordinary share, following the re-investment of
the dividend paid to shareholders on 10 April 2008.



Mr J S Heslop                            459
Mrs P A Heslop                           110
Mr D Learmouth                           106
Dr D Pulman                              207
Mrs C R Pulman                            69
Mr A P Witty                              34
Mrs C M Witty                            456



The Company and the above named persons were advised of this information on 14
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



14 April 2008


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