Director/PDMR Shareholding

GlaxoSmithKline PLC
25 February 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 25 February 2008 of an increase in the
notional allocation of Ordinary share ADRs on 22 February 2008 at a price of
$44.08 per ADR:-


Dr J P Garnier                              26
Dr M Slaoui                                 11
Mr C Viehbacher                             12
Dr R G Greig                                20
Mr W C Louv                                  6
Dr D Pulman                                  8
Mr D M Stout                                55



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



S M Bicknell

Company Secretary



25 February 2008








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