NIOX Group plc

("NIOX" or the "Company")

Director/PDMR Shareholding and Total Voting Rights

1 April 2026

NIOX Group plc (AIM: NIOX) announces that on 31 March 2026 it issued 135,188 new ordinary shares in the Company ("Ordinary Shares") to Jonathan Emms, Chief Executive Officer, under the Company's Deferred Share Bonus Plan (the "Plan").

The share issue was made in respect of the annual bonus for the 2023 financial year, which was granted on 20 March 2024. Under the terms of the Company's remuneration policy, 25% of this bonus was paid in shares at that time, with the remaining 75% of this bonus deferred for two years, other than for the sale of shares to satisfy any tax liability created on grant.

The 135,188 new Ordinary Shares issued in connection with this award are subject to an existing block admission for the respective Plan and rank pari passu with the Company's existing Ordinary Shares.

Following this allotment, Jonathan Emms' interest in the Company is as follows:

Total voting rights

Following the above share issue, the Company's issued share capital comprises 418,074,453 Ordinary Shares, each carrying one voting right. This number may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company under the FCA's Disclosure and Transparency Rules.

Additional details are provided below in accordance with the requirements of UK MAR.

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them