Director/PDMR Shareholding

GlaxoSmithKline PLC
30 March 2007


   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 and Ordinary Share ADRs ("ADRs") of GlaxoSmithKline plc ("the Company").

   29 March 2007        Abacus (GSK) Trustees Limited, as trustee of the
                        GlaxoSmithKline Employee Trust, ("the GSK Trust"), 
                        transferred 12,250 Ordinary Shares in the Company to 
                        participants in the SmithKline Beecham Employee Share 
                        Option Plan 1991.

The Company was advised of these transactions on 30 March 2007.

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 JP 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

30 March 2007


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