Director/PDMR Shareholding

GlaxoSmithKline PLC
20 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 of GlaxoSmithKline plc.




   12 March 2007           The Administrators of the SmithKline Beecham Employee Benefit Trust ("the
                           Trust") notified the Company on 20 March 2007 that 3,096 Ordinary shares had
                           been sold on 12 March 2007 on behalf of participants in the SmithKline Beecham
                           Bonus Investment Plan at a price of £14.45 per share.



                           The Trust notified the Company on 20 March 2007 that 6,146 Ordinary shares had
                           been transferred to participants in the SmithKline Beecham Bonus Investment
                           Plan.


   13 March 2007           The Trust notified the Company on 20 March 2007 that 948 Ordinary shares had
                           been transferred on 13 March 2007 to a participant in the SmithKline Beecham
                           Annual Investment Plan.



                           The Trust notified the Company on 20 March 2007 that 1,441 Ordinary shares had
                           been transferred on 13 March 2007 to a participant in the SmithKline Beecham
                           Bonus Investment Plan.




The Trust is a discretionary fund of which all non US employees or former
employees of GlaxoSmithKline plc and its subsidiaries are potential
beneficiaries. One of the Company's directors, Mr J S Heslop is therefore
interested in the shares held in the fund from time to time in the same way as
other non US 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



20 March 2007


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