Director/PDMR Shareholding

GlaxoSmithKline PLC
28 January 2008





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



Following a revaluation of the cash element of the 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 January 2008 of an increase in the notional
allocation of Ordinary Share ADRs on 25 January 2008 at a price of $46.92 per
ADR share:-


Dr JP Garnier                                119
Dr M Slaoui                                   11
Dr R G Greig                                  34
Mr W Louv                                      7
Dr D Pulman                                    9
Mr D Stout                                    57
Mr C Viehbacher                               12



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



S M Bicknell

Company Secretary



28 January 2008






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