Annual Report and Notice of AGM

Horizon Discovery Group plc

Annual Report and Notice of Annual General Meeting

Cambridge, UK, 22 May 2020: Horizon Discovery Group plc (LSE: HZD) ("Horizon", "the Group" or "the Company"), a cell engineering company focused on commercialising the application of gene editing and gene modulation to accelerate scientific innovation and biopharmaceutical drug development, today announces that its annual report and accounts for the year ended 31 December 2019, which includes the notice convening the Company's 2020 Annual General Meeting (AGM), will be posted to shareholders today.

The 2019 annual report and accounts and notice of AGM will be available on the Group's Investor Relations website at www.horizondiscoveryplc.com from 12.00 noon BST today.

Horizon's AGM will be held on Thursday, 18 June 2020 and will take place at the Company's offices ‐ Building 8100 Cambridge Research Park, Waterbeach, Cambridge, CB25 9TL, commencing at 12.00 noon BST.

As a result of current public health advice and "Stay at Home" legislation, the Company wishes to notify its shareholders that physical attendance in person at the AGM will not be possible. The meeting will take place with the minimum necessary quorum of two shareholders, which will be facilitated by the Company in line with the Government's strict social distancing advice.

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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]

Zyme Communications (Trade and Regional Media)

Lorna Cuddon

Tel: +44 (0)7787 502 947

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 organizations 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.