Director/PDMR Shareholding

GlaxoSmithKline PLC
02 January 2008



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


I give below details of changes in the directors' interests in the Ordinary
shares and American Depository Shares (ADSs) of GlaxoSmithKline plc.


On 31 December 2007, the Company's Non-Executive Directors were provisionally
allocated the following awards over Ordinary Shares and ADSs under the share
allocation arrangements for Non-Executive Directors for the period of service
from 1 October 2007 to 31 December 2007:


Non Executive Director                     Ordinary Shares        American Depository Shares
                                                                            (ADSs)
Sir Christopher Gent                           2,238.52
Prof Sir Roy Anderson                           437.97
Dr Stephanie Burns                                                          357.38
Mr Lawrence Culp                                                            536.07
Sir Crispin Davis                              1,167.92
Sir Deryck Maughan                                                          714.76
Dr Daniel Podolsky                                                          491.40
Sir Ian Prosser                                 875.94
Dr Ronaldo Schmitz                              467.17
Mr Tom de Swaan                                 437.97
Sir Robert Wilson                               389.31


The Company and the Non-Executive Directors were informed of these allocations
on 2 January 2008.


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


S M Bicknell

Company Secretary

2 January 2008


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