Notice of Full Year results

Southampton, UK – 17 April 2023: Synairgen plc (LSE: SNG), the respiratory company developing SNG001, an investigational formulation for inhalation containing the broad-spectrum antiviral protein interferon beta, will announce its preliminary statement of audited results for the year ended 31 December 2022 on Thursday 27 April 2023.

For further enquiries, please contact:

Synairgen plc

Brooke Clarke, Head of Communications

Media@synairgen.com

Tel: + 44 (0) 23 8051 2800

finnCap (NOMAD and Joint Broker)

Geoff Nash, Charlie Beeson (Corporate Finance)

Alice Lane, Sunil de Silva (ECM)

Tel: + 44 (0) 20 7220 0500

Numis Securities Limited (Joint Broker)

James Black, Freddie Barnfield, Duncan Monteith

Tel: + 44 (0) 20 7260 1000

Consilium Strategic Communications (Financial Media and Investor Relations)

Mary-Jane Elliott, Namrata Taak, Lucy Featherstone

cscsynairgen@consilium-comms.com

Tel: +44 (0) 20 3709 5700

MKC STRATEGIES, LLC (US Media Relations)

Mary Conway

MConway@MKCStrategies.com

Tel: +1 516-606-6545

Notes for Editors

About Synairgen

Synairgen is a UK-based respiratory company focused on drug discovery, development and commercialisation. The Company’s primary focus is developing SNG001 (inhaled interferon beta) for the treatment of severe viral lung infections, including COVID-19, as potentially the first host-targeted, broad-spectrum antiviral treatment delivered directly into the lungs. SNG001 has been granted Fast Track status from the US Food and Drug Administration (FDA). Founded by University of Southampton Professors Sir Stephen Holgate, Donna Davies and Ratko Djukanovic in 2003, Synairgen is quoted on AIM (LSE: SNG). For more information about Synairgen, please see www.synairgen.com.