Dividend Timetable

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NIOX Group plc has announced the dividend timetable for its proposed final dividend for the financial year ending 31 December 2025, which is subject to shareholder approval at the Annual General Meeting on 21 May 2026. The dividend per share is set at 1.55 pence, with an ex-dividend date of 21 May 2026, a record date of 22 May 2026, and a payment date of 22 June 2026.

Disclaimer*

Niox Group PLC

24 April 2026

NIOX Group plc

(the "Company")

Dividend Timetable

Oxford, UK - 24 April 2026: NIOX Group plc (AIM: NIOX) is pleased to announce the following timetable for its proposed final dividend in respect of the financial year ended 31 December 2025.

· Dividend per share: 1.55 pence

· Ex-dividend date: 21 May 2026

· Record date: 22 May 2026

· Payment date: 22 June 2026

The proposed dividend is subject to shareholder approval at the Company's Annual General Meeting on 21 May 2026.

-Ends-

For further information, please contact:

NIOX Group plc

Rebecca Clayton-Wherity, Company Secretary

+44 (0) 3303 309 356

Singer Capital Markets (Nominated Adviser and Broker)

Jen Boorer / James Fischer

+44 (0) 20 7496 3000

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