Arrangements for Shareholder Webcast

GlaxoSmithKline plc

(the "Company")

Arrangements for Shareholder Webcast - Wednesday 6 May 2020

Further to the Company's announcement on 9 April 2020 that this year's Annual General Meeting ("AGM") will be run as a closed meeting due to the UK Government's restrictions on public gatherings as a result of the COVID-19 pandemic, the Company is pleased to announce that it will be holding a live webcast for shareholders following the AGM on Wednesday 6 May 2020.

Details of Shareholder Webcast

The webcast will take place following the AGM on Wednesday 6 May 2020. It will commence at 2.45pm (UK time) and finish at 3.45pm (UK time). Any changes to these times will be published on the Company's website at www.gsk.com/en-gb/investors/shareholder-information/annual-general-meeting/.

Shareholders wishing to join the webcast are strongly encouraged to join online. For those shareholders who are not able to join online, a telephone conference call facility will be available.

For details on how to register for the webcast online or to dial-in to the telephone conference call please go to www.gsk.com/en-gb/investors/shareholder-information/annual-general-meeting/. Shareholders who wish to join the webcast online are requested to register as soon as possible and ideally at least 24 hours before the start of the webcast.

Please note that the webcast is intended for shareholders only. Shareholders will therefore be asked to provide their details before accessing the event.

During the webcast, updates will be given by Sir Jonathan Symonds, GSK's Chairman, and Emma Walmsley, Chief Executive Officer.

Following these there will be an opportunity for shareholders to ask questions. Shareholders may also submit their questions in advance of the webcast by emailing  [email protected].

The Board will endeavour to ensure that all questions are answered either during the webcast or by publishing them on the Company's website after the webcast.

Please note that no inside information will be provided during the webcast.

The Board would like to take this opportunity to thank all shareholders for their continued support and understanding in these exceptional circumstances.

V A Whyte

Company Secretary

29 April 2020