Posting of Annual Report and Notice of AGM

Press release

Synairgen plc

('Synairgen' or the 'Company')

Posting of Annual Report and Notice of AGM

Southampton, UK - 5 June 2017: Synairgen (LSE: SNG), the respiratory drug discovery and development company, announces that on 2 June 2017 it posted its full Audited Report and Accounts for the twelve months ended 31 December 2016 (the "Annual Report") to shareholders together with the Notice of Annual General Meeting ("AGM"). The Annual Report and Notice of AGM are also available on the Company's website www.synairgen.com.

The AGM will be held at the offices of Fladgate LLP, 16 Great Queen Street, London WC2B 5DG on 28 June 2017 at 11 am.

- Ends -

For further enquiries, please contact:

Synairgen plc

Richard Marsden, Chief Executive Officer

John Ward, Finance Director

Tel: + 44 (0) 23 8051 2800

finnCap

Geoff Nash, James Thompson (Corporate Finance)

Stephen Norcross, Simon Johnson (Corporate Broking)

Tel: + 44 (0) 20 7220 0500

Consilium Strategic Communications (Financial Media and Investor

Relations)

Mary-Jane Elliott / Sue Stuart / Jessica Hodgson / Laura Thornton

[email protected]

Tel: +44 (0) 20 3709 5701

Notes for Editors

About Synairgen

Synairgen is a respiratory drug discovery and development company founded by University of Southampton Professors Stephen Holgate, Donna Davies and Ratko Djukanovic. The business, focused primarily on asthma and COPD, uses its differentiating human biology BioBank platform and world-renowned international academic KOL network to discover and develop novel therapies for respiratory disease. Leveraging its scientific and clinical facilities at Southampton General Hospital, the Company uses in vitro and ex vivo models to progress opportunities into clinical development. The BioBank of human samples is used in these models to increase confidence in the likelihood of successful drug development. Core to Synairgen's business strategy is the realisation of value via licensing transactions. In August 2015 the Company entered into a collaboration with Pharmaxis to develop an oral LOXL2 inhibitor to reduce fibrosis in patients with idiopathic pulmonary fibrosis (IPF). Synairgen is quoted on AIM (LSE: SNG). For more information about Synairgen, please see www.synairgen.com.