Result of AGM

Horizon Discovery Group plc

Result of AGM

Cambridge, UK, 18 June 2020: Horizon Discovery Group plc (LSE: HZD) ("Horizon", or "the Company"), a cell engineering company focused on commercialising the application of gene editing and gene modulation, announces that at its Annual General Meeting held today at 12.00 p.m. at the Company's offices, all resolutions were duly passed.

Ends

For further information from Horizon Discovery Group plc, please contact:

Horizon Discovery Group plc

Terry Pizzie, Chief Executive Officer

Jayesh Pankhania, Chief Financial Officer

Jon Davies, Head of Investor Relations

Tel: +44 (0) 1223 655 580

Numis Securities Limited (Broker and NOMAD)

Freddie Barnfield / Duncan Monteith

Tel: +44 (0) 207 260 1000

Consilium Strategic Communications (Financial Media and UK Investor Relations)

Mary-Jane Elliott / Matthew Neal / Melissa Gardiner

Tel: +44 (0) 20 3709 5700

Email: [email protected]

Westwicke, an ICR Company (US Investor Relations)

Stephanie Carrington

Tel. +1 646-277-1282

Email: [email protected]

About Horizon Discovery Group plc www.horizondiscovery.com

Horizon Discovery Group plc (LSE: HZD) ("Horizon") is a cell engineering company focused on commercialising the application of gene editing and gene modulation to accelerate scientific innovation and biopharmaceutical drug development. Horizon's portfolio of tools and services is built on decades of experience in altering the expression of genes across mammalian and human cell types to provide cell engineering tools and services to customers in three key areas of the therapeutic ecosystem: basic research, drug discovery and development and therapeutic applications. Horizon's offerings support and enable critical elements of the drug development and therapeutic value chain, particularly in the area of precision medicine. Horizon's customers include biopharmaceutical and diagnostics companies, contract research and manufacturing organisations and academic researchers across the globe.

Horizon is headquartered in Cambridge, UK with offices in USA and Japan. The Group is listed on the London Stock Exchange's AIM market under the ticker HZD.