Director/PDMR Shareholding

GlaxoSmithKline PLC
21 August 2006


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


I give below details of changes in the interests of Directors, Persons
Discharging Managerial Responsibility or Connected Persons in the Ordinary
Shares of GlaxoSmithKline plc.
                         
   17 August 2006        Abacus (GSK) Trustees Limited, as trustee of the
                         GlaxoSmithKline Employee Trust, ("the GSK Trust"), 
                         transferred 14,130 Ordinary Shares in the Company 
                         to participants in the SmithKline Beecham Employee 
                         Share Option Plan 1991.

   18 August 2006        The GSK Trust transferred 8,100 Ordinary Shares 
                         in the Company to participants in the SmithKline 
                         Beecham Employee Share Option Plan 1991.

The Company was advised of these transactions on 21 August 2006.

The GSK Trust is a discretionary trust of which all employees or former
employees of GlaxoSmithKline plc and its subsidiaries are potential
beneficiaries. Three of the Company's directors, Dr J-P Garnier, Dr M M Slaoui
and Mr J S Heslop are therefore interested in the shares held in the GSK Trust
from time to time in the same way as other employees or former employees of
GlaxoSmithKline plc and its subsidiaries.

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


S M Bicknell
Company Secretary

21 August 2006


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