Total Voting Rights

Horizon Discovery Group plc

Total Voting Rights

7 June 2019

In accordance with Disclosure and Transparency Rule 5.6.1 Horizon Discovery Group plc (the "Company") advises that:

As at 31 May 2019, the Company's issued share capital consisted of 150,437,119 ordinary shares of 1p each with voting rights. The Company does not hold any ordinary shares in Treasury.

The total number of voting rights in the Company is therefore 150,437,119.

The above figure (150,437,119) may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Horizon Discovery Group plc under the FCA's Disclosure and Transparency Rules.

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)

James Black / Freddie Barnfield / Duncan Monteith

Tel: +44 (0) 207 260 1000

Consilium Strategic Communications (Financial Media and Investor Relations)

Mary-Jane Elliott / Matthew Neal / Melissa Gardiner

Tel: +44 (0) 20 3709 5700

Email: [email protected]