Director/PDMR Shareholding

GlaxoSmithKline PLC
14 February 2008



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


The Administrators of the GlaxoSmithKline Performance Share Plan notified the
Company and the under-mentioned persons on 14 February 2008 of an increase in
their notional interests in Ordinary shares at a price of £12.38 per share and
Ordinary Share ADRs at a price of $51.25 per ADR following the notional
re-investment of the dividend paid to shareholders on 10 January 2008.


                                       Ordinary shares              ADRs

Dr J-P Garnier                                                    7,217.84
Mr J S Heslop                               2,405.18
Dr M Slaoui                                   429.55                729.95
Mrs C E Bruck Slaoui                           37.41                 16.61
Mr R M Bondy                                2,559.41
Mr J M Clarke                               1,979.56
Mr M Dunoyer                                  963.94
Mr E J Gray                                   392.22
Dr R G Greig                                                        822.02
Mr D Learmouth                                352.75
Mr W C Louv                                                         380.89
Mr D J Phelan                                                     1,265.91
Dr D Pulman                                                         822.02
Mr D M Stout                                                      3,015.28
Mr C Viehbacher                                                   1,308.23
Mr A P Witty                                2,644.93



The notional dividends accrued will be paid out in proportion to the percentage
of participants' Performance Share Plan holdings that vest following the end of
the relevant three year measurement period.

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


S M Bicknell
Company Secretary

14 February 2008


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