Summit Therapeutics plc : Exercise of Share Options

Summit Therapeutics plc
("Summit" or the "Company")

EXERCISE OF SHARE OPTIONS

Oxford, UK, 29 September 2017 - Summit Therapeutics plc (AIM: SUMM, NASDAQ: SMMT), the drug discovery and development company advancing therapies for Duchenne muscular dystrophy and C. difficile infection, announces that, following the exercise of employee share options, the Company has issued 94,425 new ordinary shares of 1p each (the "New Ordinary Shares").

Application will be made for the admission to trading on AIM of the New Ordinary Shares, which will rank pari passu with the Company`s existing ordinary shares, and admission is expected to occur on or around 6 October 2017.

Following admission of the New Ordinary Shares to trading on AIM, the total number of ordinary shares with voting rights in issue will 70,443,833. This figure 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, the Company under the FCA`s Disclosure and Transparency Rules.

This announcement contains inside information for the purposes of Article 7 of EU Regulation 596/2014.

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For more information, please contact:

Summit Therapeutics Richard Pye (UK office) Erik Ostrowski (US office)	Tel: +44 (0)1235 443 951 +1 617 294 6607
Cairn Financial Advisers LLP (Nominated Adviser) Liam Murray / Tony Rawlinson	Tel: +44 (0)20 7213 0880

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This announcement is distributed by Nasdaq Corporate Solutions on behalf of Nasdaq Corporate Solutions clients.

The issuer of this announcement warrants that they are solely responsible for the content, accuracy and originality of the information contained therein.
Source: Summit Therapeutics plc via GlobeNewswire
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