Director/PDMR Shareholding

GlaxoSmithKline PLC
18 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 18 February 2008 of an increase in the
notional allocation of Ordinary Share ADRs on 14 February 2008 at a price of
$43.32 per ADR:-


Dr J P Garnier                             105
Dr M Slaoui                                  3
Mr C Viehbacher                              8
Mr E J Gray                                 24
Dr R G Greig                               173
Mr W C Louv                                  9
Dr D Pulman                                 22
Mr D M Stout                                54
Mrs C Bruck Slaoui                           2



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



S M Bicknell
Company Secretary



18 February 2008






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