Director/PDMR Shareholding

GlaxoSmithKline PLC
16 April 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 15 April 2008 of an increase in their
interests in Ordinary share ADRs at a price of $43.84 per ADR following the
re-investment of the dividend paid to shareholders on 10 April 2008.


Dr JP Garnier                       1,098.72

Mr D J Phelan                         235.44



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



S M Bicknell
Company Secretary

16 April 2008




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