Director/PDMR Shareholding

GlaxoSmithKline PLC
28 August 2007



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


Following a re-valuation of the cash element of the notional investment held
within the US Retirement Savings Plan ("The Plan"), which is notionally held in
GSK Ordinary Share ADRs, the Administrators of the Plan notified GlaxoSmithKline
plc and the under-mentioned persons on 28 August 2007 of:
          
     (i)  An increase in the notional allocation of Ordinary Share ADRs on 24 
     August 2007 at a price of $52.22 per ADR share:-

     Mrs C Bruck Slaoui                          3
     Dr R G Greig                                3

This notification relates to transactions notified in accordance with Disclosure
and Transparency Rules 3.1.4R(1)(a) and 3.1.4R(1)(b).


S M Bicknell
Company Secretary

28 August 2007


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