Director/PDMR Shareholding

GlaxoSmithKline PLC
12 March 2008


   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 in respect of the under-mentioned persons arising
from the purchase of Ordinary shares at a price of £10.37 per Ordinary share on
11 March 2008 through the Company's ShareReward Plan ("the Plan") which the
under mentioned persons entered on 5 October 2001:

                         
Mr J S Heslop            Acquisition of 12 Ordinary shares under the partnership 
                         element of the Plan (personal contribution)

                         Acquisition of 12 Ordinary shares under the matching 
                         element of the Plan (Company contribution)


Mr R M Bondy             Acquisition of 12 Ordinary shares under the partnership 
                         element of the Plan (personal contribution)

                         Acquisition of 12 Ordinary shares under the matching 
                         element of the Plan (Company contribution)


Mr E J Gray              Acquisition of 12 Ordinary shares under the partnership 
                         element of the Plan (personal contribution)

                         Acquisition of 12 Ordinary shares under the matching 
                         element of the Plan (Company contribution)


Mr D Learmouth           Acquisition of 12 Ordinary shares under the partnership 
                         element of the Plan (personal contribution)

                         Acquisition of 12 Ordinary shares under the matching 
                         element of the Plan (Company contribution)


Mr A P Witty             Acquisition of 12 Ordinary shares under the partnership 
                         element of the Plan (personal contribution)

                         Acquisition of 12 Ordinary shares under the matching 
                         element of the Plan (Company contribution)

The Company and the above-mentioned persons were advised of this information on
12 March 2008.

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


S M Bicknell
Company Secretary


12 March 2008


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