Director/PDMR Shareholding

GlaxoSmithKline PLC
15 January 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 15 January 2008 of an increase in the
notional allocation of Ordinary Share ADRs on 11 January 2008 at a price of
$53.14 per ADR:-


Mr W C Louv                                  5

Dr M Slaoui                                 10

Mr D M Stout                                45

Dr D Pulman                                  6

Dr R G Greig                                14

Dr J P Garnier                              97

Mr C Viehbacher                             10



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



S M Bicknell
Company Secretary


15 January 2008



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