Sosei : Statement Regarding Vectura Group plc

Sosei Statement Regarding Vectura Group plc

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, IN WHOLE OR IN PART IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OF THAT JURISDICTION.

THIS IS AN ANNOUNCEMENT FALLING UNDER RULE 2.8 OF THE UK CITY CODE ON TAKEOVERS AND MERGERS (THE "CODE").

FOR IMMEDIATE RELEASE

Tokyo, Japan and London, UK, 25 April 2018 - Sosei Group Corporation ("Sosei") notes the recent press speculation regarding a possible offer for Vectura Group plc ("Vectura"). Sosei confirms that it does not intend to make an offer for Vectura.

As a result of this announcement, Sosei will, except with the consent of the UK Panel on Takeovers and Mergers (the "Panel"), be bound by the restrictions contained in Rule 2.8 of the Code.

Under Note 2 on Rule 2.8 of the Code, Sosei, and any person acting in concert with Sosei, reserves the right to set aside the restrictions in Rule 2.8 in the following circumstances: (i) with the agreement of the board of Vectura; (ii) if any third party announces a firm intention to make an offer for Vectura; (iii) if Vectura announces a "whitewash" proposal (see Note 1 of the Notes on Dispensations from Rule 9) or a reverse takeover (as defined in the Code); or (iv) if there has been a material change of circumstances (as determined by the Panel).

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Sosei is an international biopharmaceutical company focused on the design and development of new medicines originating from its proprietary GPCR-targeted StaR® technology and structure-based drug design platform capabilities. The Company is advancing a broad and deep pipeline of partnered and wholly owned product candidates in multiple therapeutic areas, including CNS, cancer, metabolic diseases and other rare/specialty indications. The Company's leading clinical programs include a proprietary Phase 2 candidate for dementia with Lewy bodies (DLB) in Japan, together with partnered candidates aimed at the symptomatic treatment of Alzheimer's disease (with Allergan) and immuno-oncology approaches to treat cancer (with AstraZeneca). Sosei's additional partners and collaborators include Novartis, Pfizer, Daiichi-Sankyo, PeptiDream, Kymab and MorphoSys. The Company is headquartered in Japan with R&D facilities in the UK.

Sosei is listed on the Mothers Index of the Tokyo Stock Exchange (ticker: 4565). For more information, please visithttp://www.sosei.com/en/.