TRISTEL PLC

Transaction in Own Shares • Dec 12, 2025

National Storage Mechanism | Additional information

RNS Number : 4009L

Tristel PLC

12 December 2025

Tristel plc

("Tristel" or the "Company")

Director/PDMR Shareholding

Tristel plc (AIM: TSTL), the manufacturer of infection prevention products, announces that, on 11 December 2025, Tom Jenkins, Non Executive Director of the Company, purchased 5,400 ordinary shares of 1 penny each in the Company ("Ordinary Shares") at a price of 368 pence per Ordinary Share.

As a result, Tom Jenkins' beneficial interest in the Company is now 13,400 Ordinary Shares, representing 0.03 per cent. of the total issued share capital.

For further information please contact:     

Tristel plc			Via Walbrook PR
Matt Sassone, Chief Executive Officer			investors.tristel.com
Anna Wasyl, Chief Financial Officer
Walbrook PR Ltd	Tel: 020 7933 8780 or [email protected]
Paul McManus / Lianne Applegarth / Anna Dunphy		Mob: 07980 541 893/ 07584 391 303/ 07876 741 001
Cavendish Capital Markets Ltd			Tel: 020 7220 0500
Geoff Nash / Callum Davidson / Trisyia Jamaludin (Corporate Finance)
Sunila de Silva (Corporate Broking) / Louise Talbot (Sales)

About Tristel plc

Tristel plc is a global infection prevention company focussed on the manufacture and supply of products using its unique proprietary chlorine dioxide (ClO2) chemistry. The Company is a market leader in manual decontamination of medical devices, supplying hospitals under the Tristel brand, and under the Cache brand provides products for sporicidal surface disinfection, in a format which is a sustainable alternative to commonly used pre-wetted plastic wipes.

Tristel's head office and manufacturing facility is located in Snailwell, near Cambridge, and operates globally employing approximately 250 people across 14 subsidiaries selling into 40 countries.

The Company has been listed on the London Stock Exchange's AIM market since 2005 (AIM: TSTL).

For more information about Tristel's product range please visit: https://tristel.com

Details of the person discharging managerial responsibilities / person closely associated
Name	Tom Jenkins
Reason for the Notification
Position/status	Director
Initial notification/Amendment	Initial notification
Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
Name	Tristel plc
LEI	2138009DZ4LH9CZGF662
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
Description of the Financial instrument, type of instrument	Ordinary shares of 1p each
Identification code	GB00B07RVT99
Nature of the transaction	Purchase of Ordinary Shares
Price(s) and volume(s)	368 pence, 5,400 shares
Aggregated information: · Aggregated volume · Price	See above
Date of the transaction	11 December 2025
Place of the transaction	London Stock Exchange, AIM Market (XLON)

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