Director/PDMR Shareholding

GlaxoSmithKline PLC
28 June 2007


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

I give below details of changes in interests in the Ordinary shares of
GlaxoSmithKline plc in respect of the under-mentioned Director:-
                         
Mr Andrew P Witty        Exercise of 7,352 share options on 28 June 2007 under 
                         the GlaxoWelcome UK International Share Option Scheme 
                         granted on 13 August 1997.  Sale of 7,352 ordinary 
                         shares at a price of £13.05 per share.

The Company was advised of this transaction on 28 June 2007.

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

S M Bicknell
Company Secretary

28 June 2007


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