Director/PDMR Shareholding

GlaxoSmithKline PLC
12 October 2007


   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 resulting from the reinvestment of dividends paid to
shareholders on 11 October 2007 under a Single Company ISA at a price of £13.07
per Ordinary share:

Mr J S Heslop                                                                5

Mr A P Witty                                                                 4

The Company and the above named persons were advised of this information on 12
October 2007.

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

S M Bicknell
Company Secretary

12 October 2007


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