Posting of Annual Report

Press release

Synairgen plc

('Synairgen' or the 'Company')

Notice of Report and Accounts

Southampton, UK - 9 April 2013: Synairgen plc (LSE: SNG), the respiratory drug discovery and development company with a focus on viral defence of the lungs, announces that the Company's Report and Accounts for the year ended 31 December 2012 has been posted to shareholders. A copy of the report and accounts can be found on the Company's website: www.synairgen.com.

-Ends-

For further information, please contact:

Synairgen plc Tel: + 44 (0) 23 8051 2800

Richard Marsden, Chief Executive Officer

John Ward, Finance Director

FinnCap Tel: + 44 (0) 20 7220 0500

Geoff Nash, Christopher Raggett (Corporate Finance)

Stephen Norcross, Simon Starr (Corporate Broking)

Newgate Threadneedle Tel: + 44 (0) 20 7653 9850

Graham Herring

Josh Royston