Director/PDMR Shareholding

GlaxoSmithKline PLC
16 July 2007


         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 16 July 2007 of an increase in their
notional interests in Ordinary Shares at a price of £14.41 per share and
Ordinary Share ADRs at a price of $57.68 per ADR following the notional
re-investment of the dividend paid to shareholders on 12 July 2007.

                                      Ordinary Shares                    ADRs

Dr JP Garnier                                                        5,686.35
Mr J S Heslop                                 1873.73
Mr W C Louv                                                            300.06
Dr M M Slaoui                                  334.63                  575.01
Mrs C E Bruck Slaoui                            29.14                   13.08
Mr R M Bondy                                 1,993.89
Mr J M Clarke                                 1542.16
Mr M Dunoyer                                   750.95
Dr R G Greig                                                           647.61
Mr D Learmouth                                 274.81
Mr D J Phelan                                                          997.31
Dr D Pulman                                                            647.61
Mr D M Stout                                                         2,375.48
Mr C Viehbacher                                                      1,030.65
Mr A P Witty                                                         2,060.51


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
Rules 3.1.4R(1)(a) and 3.1.4R(1)(b).


S M Bicknell
Company Secretary

16 July 2007


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