Director/PDMR Shareholding

GlaxoSmithKline PLC
15 April 2008





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





I give below details of changes in interests in the Ordinary shares of
GlaxoSmithKline plc in respect of the under-mentioned persons, arising from the
purchase of Ordinary shares on 10 April 2008 following the reinvestment of
dividends, under a Single Company ISA at a price of £11.13 per Ordinary share:


Mr J S Heslop               9


Mr E J Gray                 7


Mr A P Witty                7





The Company and the above named persons were advised of this information on 15
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



15 April 2008


                      This information is provided by RNS
            The company news service from the London Stock Exchange