NIOX GROUP PLC — Director's Dealing 2026

May 29, 2026

National Storage Mechanism | Additional information

RNS Number : 3058G

Niox Group PLC

29 May 2026

NIOX Group plc

("NIOX" or the "Company")

Director/PDMR Shareholding

29 May 2026

NIOX Group plc (AIM: NIOX) notifies that on 28 May 2026, its Chief Financial Officer, Sarah Duncan, sold 34,219 ordinary shares of 0.08 pence each in the Company ("Ordinary Shares") from her share dealing account at a price of 58.40 pence per Ordinary Share and subsequently repurchased 34,139 Ordinary Shares into her ISA at 58.50 pence per Ordinary Share.

In addition, on 29 May 2026, Sarah Duncan sold 33,916 Ordinary Shares from her share dealing account at a price of 59.00 pence per Ordinary Share. On the same date, James Duncan, Sarah Duncan's spouse and therefore a Person Closely Associated ("PCA"), purchased 34,127 Ordinary Shares into his ISA at a price of 58.60 pence per Ordinary Share.

Resulting interests

Following these transactions, Sarah Duncan's total reportable shareholding in the Company is 137,145 Ordinary Shares (including those held in her husband's name), which equates to 0.03% of the Company's issued share capital.

Additional detail is provided below in accordance with the requirements of UK MAR.

For further information, please contact:
NIOX Group plc Jonathan Emms, Chief Executive Officer Sarah Duncan, Chief Financial Officer Rebecca Clayton-Wherity, Company Secretary	+44 (0) 3303 309 356
Singer Capital Markets (Nominated Adviser & Broker) Jen Boorer / James Fischer	+44 (0) 20 7496 3000

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

1.         

Details of the person discharging managerial responsibilities / person closely associated

a.         

Name

Sarah Duncan

2.  

Reason for the notification

a.         

Position/status

Chief Financial Officer

b.         

Initial notification

/Amendment

Initial notification

3.         

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a.         

Name

NIOX Group plc

b.         

LEI

2138006YAT138TOGA556

4.         

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a.         

Description of the

Financial instrument, type of instrument

Identification code

Ordinary Shares of 0.08p each

GB00BJVD3B28

b.         

Nature of the transaction

Sale of Ordinary Shares and repurchase of Ordinary Shares into ISA

c.         

Price(s) and volume(s)

Price(s)	Volume(s)
58.40p (sale)	34,219
58.50p (purchase)	34,139

d.         

Aggregated information

·      Aggregated volume

·      Price

n/a

e.         

Date of the transaction

28/05/2026

f.         

Place of the transaction

London Stock Exchange, AIM

2.         

Details of the person discharging managerial responsibilities / person closely associated

a.         

Name

Sarah Duncan

5.  

Reason for the notification

a.         

Position/status

Chief Financial Officer

b.         

Initial notification

/Amendment

Initial notification

6.         

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a.         

Name

NIOX Group plc

b.         

LEI

2138006YAT138TOGA556

7.         

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a.         

Description of the

Financial instrument, type of instrument

Identification code

Ordinary Shares of 0.08p each

GB00BJVD3B28

b.         

Nature of the transaction

Sale of Ordinary Shares

c.         

Price(s) and volume(s)

Price(s)	Volume(s)
59.0p (sale)	33,916

d.         

Aggregated information

·      Aggregated volume

·      Price

n/a

e.         

Date of the transaction

29/05/2026

f.         

Place of the transaction

London Stock Exchange, AIM

3.         

Details of the person discharging managerial responsibilities / person closely associated

a.         

Name

James Duncan

8.  

Reason for the notification

a.         

Position/status

PCA of Sarah Duncan, Chief Financial Officer

b.         

Initial notification

/Amendment

Initial notification

9.         

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a.         

Name

NIOX Group plc

b.         

LEI

2138006YAT138TOGA556

10.         

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a.         

Description of the

Financial instrument, type of instrument

Identification code

Ordinary Shares of 0.08p each

GB00BJVD3B28

b.         

Nature of the transaction

Purchase of Ordinary Shares in ISA

c.         

Price(s) and volume(s)

Price(s)	Volume(s)
58.60p	34,127

d.         

Aggregated information

·      Aggregated volume

·      Price

n/a

e.         

Date of the transaction

29/05/2026

f.         

Place of the transaction

London Stock Exchange, AIM

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