Director/PDMR Shareholding

GlaxoSmithKline PLC
18 April 2008



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


I give below details of an increase in interests in Ordinary shares at a price
of £10.73 per share and Ordinary share ADRs at a price of $43.32 per ADR in
GlaxoSmithKline plc in respect of the personal holdings of the under-mentioned
persons, following the re-investment of the dividend paid to shareholders on 10
April 2008.

                                    Ordinary shares                    ADRs
Dr M M Slaoui                                 25.97
Mrs C E Bruck Slaoui                          14.84
Mr EJ Gray                                    26.52
Mr D Learmouth                                25.02
Mr W C Louv                                                           14.19
Mr S M Werner                                                         14.47

The Company and the above named persons were advised of this information on 18
April 2008.

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


S M Bicknell
Company Secretary


18 April 2008


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