Director/PDMR Shareholding

GlaxoSmithKline PLC
10 March 2008


   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 10 March 2008 of an increase in the
notional allocation of Ordinary Share ADRs on 7 March 2008 at a price of $42.41
per ADR:-


Dr M Slaoui                                 59
Dr R G Greig                               238
Mr W C Louv                                 82
Dr D Pulman                                 75
Mr C Viehbacher                             57



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



S M Bicknell

Company Secretary



10 March 2008






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