National Storage Mechanism | Additional information

NIOX Group plc

(the "Company")

Dividend Timetable

Oxford, UK - 24 April 2025: 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 2024.

· Dividend per share : 1.25 pence

· Ex-dividend date : 15 May 2025

· Record date : 16 May 2025

· Payment date : 16 June 2025

The proposed dividend is subject to shareholder approval at the Company's Annual General Meeting on 14 May 2025.

-Ends-

For further information, please contact:

NIOX Group plc

Sarah Duncan, Company Secretary

+44 (0) 3303 309 356

Singer Capital Markets (Nominated Adviser and Joint Broker)

Jen Boorer / James Fischer/ James Todd

+44 (0) 20 7496 3000

Investec Bank plc (Financial Adviser and Joint Broker)

Ben Lawrence / Lydia Zychowska

+44 (0) 20 7597 4000

This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.

RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy.

END