Notice of 2026 Annual General Meeting

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NIOX Group plc has announced the availability of its Notice of Meeting for the 2026 Annual General Meeting, which will be held on Thursday, May 21, 2026, at 11:00 AM. The company has also posted copies of its 2025 Annual Report and Accounts to shareholders who requested hard copies. Shareholders wishing to attend the AGM must register their intention by emailing IR@niox.com no later than 11:00 AM on May 19, 2026.

Disclaimer*

Niox Group PLC

21 April 2026

NIOX Group plc

(the "Company")

Notice of 2026 Annual General Meeting

Oxford, UK - 21 April 2026: NIOX Group plc (AIM: NIOX) today announces that the Notice of Meeting for the 2026 Annual General Meeting ("AGM") is now available on the Company's website at: www.investors.niox.com. This, along with copies of the 2025 Annual Report and Accounts, have been posted to shareholders who requested hard copies.

The AGM will be held at 11.00am on Thursday 21 May 2026 at the Company's Registered Office: Magdalen Centre, 1 Robert Robinson Ave, The Oxford Science Park, Oxford, England, OX4 4GA.

Shareholders intending to attend the AGM must register their intention to do so by emailing IR@niox.com as soon as practicable but no later than 11.00am on 19 May 2026.

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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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