Glaxosmsc 5.25% Regulatory News (AG99)

Publication of Base Prospectus

The following Base Prospectus dated 5 August 2013 has been approved by the UK Listing Authority and is available for viewing:

GlaxoSmithKline plc and GlaxoSmithKline Capital plc £15,000,000,000 Euro Medium Term Note Programme

Copies of the Base Prospectus and the documents incorporated by reference therein have been submitted to the National Storage Mechanism and will shortly be available for inspection at www.Hemscott.com/nsm.do

For further information, please contact:

GlaxoSmithKline plc

980 Great West Road

Brentford

Middlesex

TW8 9GS

United Kingdom

Enquiries:

BASIS ON WHICH YOU MAY ACCESS THE BASE PROSPECTUS

Please note that the information contained in the Base Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Base Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Base Prospectus is not addressed. Prior to relying on the information contained in the Base Prospectus you must ascertain from the Base Prospectus whether or not you are part of the intended addressees of the information contained therein.

Your right to access this service is conditional upon complying with the above requirements.