Sosei Group

Notice of Change of Corporate Name to Nxera Pharma and Change of Location of Head Office

Tokyo, Japan and Cambridge, UK, 16 February 2024 – Sosei Group Corporation (“Sosei Heptares” or “the Company”; TSE: 4565), today announces that at a meeting held on 15 February 2024, its Board of Directors resolved to change the corporate names of the Company and its subsidiaries and the location of the head office of the Company. At the same meeting, the Board resolved to merge Idorsia Pharmaceuticals Japan Ltd ("IPJ") and Sosei Co. Ltd., both of which are wholly owned consolidated subsidiaries of the Company, and to change the corporate name of IPJ as the surviving company.

The Board also resolved to submit a proposal on the “Partial Amendments to the Articles of Incorporation” to the 34^th Ordinary General Meeting of Shareholders scheduled to be held on 27 March 2024 (details below).

1. Change of corporate names of the Company and its subsidiaries

1. Reason for change

In July 2023, the Company acquired all the issued shares of IPJ and made it a wholly owned subsidiary with the strategic goal to expand the Company’s operations in Japan. As IPJ and Sosei Co. Ltd., also a wholly owned subsidiary of the Company, plan to merge as of the effective date 1 April  2024 as described in 3 below, the Company has decided to use the event to adopt a unified corporate brand and corporate name for the Group, including all subsidiaries.

The name “Nxera” derives from the words “Next” and “Era” to express the Company’s determination to be a leader in the next era of science and healthcare. “Nxera” will be a technology enabled pharma company that will challenge the status quo in its pursuit of better treatments for patients in need across multiple therapeutic areas.

2. New corporate names

Current name	New name
Sosei Group Corporation	Nxera Pharma Co., Ltd.
Idorsia Pharmaceuticals Japan Ltd	Nxera Pharma Japan Co., Ltd.
Idorsia Pharmaceuticals Korea Co., Ltd	Nxera Pharma Korea Co., Ltd.
Heptares Therapeutics Ltd.	Nxera Pharma UK Limited

Pronounced in English /nex/ /era/
Pronounced in Japanese /nexa/ /era/

3. Date of change

1 April 2024 (planned)
* The change is subject to the approval of a partial amendment to the Articles of Incorporation at the Ordinary General Meeting of Shareholders.

2. Change of location of head office of the Company

1. Reason for the change

Considering the merger between the subsidiaries as described in 3 below, the Company’s head office will be moved to the same location as the head office of IPJ (Minato-ku, Tokyo) to accelerate business integration and enhance operating efficiencies.