Director/PDMR Shareholding

GlaxoSmithKline PLC
13 July 2007


   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 £12.74 per Ordinary Share, following the re-investment of
the dividend paid to shareholders on 12 July 2007.

Mr J S Heslop                                              290
Mrs P A Heslop                                             70
Mr R Bondy                                                 315
Mr D Learmouth                                             46
Dr D Pulman                                                131
Mr A P Witty                                               21
Mrs C M Witty                                              289

The Company and the above named persons were advised of this information on 13
July 2007.

This notification relates to a transaction notified in accordance with
Disclosure Rules 3.1.4R(1)(a) and 3.1.4R(1)(b).

S M Bicknell
Company Secretary

13 July 2007


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