Director/PDMR Shareholding

GlaxoSmithKline PLC
19 December 2007

   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 Dr R
G Greig on 17 December 2007 of an increase in the notional allocation of
Ordinary share ADRs on 14 December 2007 at a price of $53.00 per ADR share:-


                                             No. of ADRs
Dr R G Greig                                           2


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

Additionally, following the recalculation of the cash element of the notional
investment in GSK Ordinary share ADRs under The Plan, the previous increases in
the notional allocations of ADRs at a price of $51.25 per ADR share, announced
on 2 November 2007, are restated as follows:-


                                          No. of ADRs
                                       Previous       Restated
                                      valuation      valuation
Mr W Louv                                     6              7
Dr M Slaoui                                   1              2
Mr D Stout                                   37             38
Dr D Pulman                                  15             16
Dr R G Greig                                 89             88


Following a separate recalculation of the cash element of the notional
investment in GSK Ordinary share ADRs under The Plan, the increase in the
notional allocation of ADRs to Dr R G Greig announced on 28 November 2007 was
3,279 ADRs at a price of $50.19 per ADR share (not 3,287 ADRs as previously
announced). This final restatement is required as a result of a technical
calculation of notional ADRs advised to the Company by a third party.



S M Bicknell
Company Secretary
19 December 2007


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