TRISTEL plc

("Tristel" or the "Company")

Appointment of Chief Financial Officer

Tristel plc (AIM: TSTL), the manufacturer of infection prevention products, announces the appointment of Anna Wasyl as Chief Financial Officer ("CFO"), with effect from 1 September 2025. Anna's appointment follows the conclusion of a competitive selection process and replaces Liz Dixon, who left the business on 30 June 2025, having been with the Group since 2007.

Anna is a dynamic and commercially focused CFO with a strong track record in multinational organisations and technology-driven sectors, including medical devices, robotics, and industrial automation. She brings a rare blend of operational, strategic, and financial expertise, with over 20 years of experience across publicly listed and venture-backed companies. Throughout her career, Anna has led cross functional high-performing teams, overseen business operations with revenues up to $1 billion, and raised over $200 million in capital.

Anna joins Tristel from CMR Surgical ("CMR"), the Cambridge-based global surgical robotics business, where she served as Chief Commercial Partnerships and Operations Officer, having previously held the role of Group CFO. During her tenure, Anna led the company through go-to-market model transition and a major turnaround programme, delivering significant reduction of operational expenses and cash burn. She was also instrumental in introducing innovative commercial models, new revenue streams, and launching strategic partnerships across 20 countries.

Prior to joining CMR, Anna spent 18 years at ABB Group ("ABB"), a global leader in automation and robotics, where she rose through the ranks to become CFO of the Robotics & Discrete Automation Business Unit in Shanghai, China. Her earlier international postings with ABB included the USA, Mexico, and Switzerland, giving her deep cross-cultural and functional insight.

Anna holds a Master's degree in International Economic Relations from the Warsaw School of Economics and has completed executive programmes at Wharton Business School, Duke University, and IMD Lausanne. She is fluent in English, Spanish, and Polish. She lives in Cambridge, UK.

Anna Wasyl, Chief Financial Officer of Tristel plc

Anna Wasyl, incoming CFO of Tristel, commented: "I am honoured to join Tristel as its new Chief Financial Officer. Tristel has established a well-earned reputation for innovation and leadership in infection prevention, and I look forward to being CFO for this exceptional business. I am eager to build on the strong financial and strategic foundation established by Liz Dixon, and to working closely with the Board, executive leadership, and global teams to drive long-term, sustainable growth. My priorities will include capitalising on global market opportunities, enhancing operational efficiency, and strengthening our presence in key geographies. Together, we will continue to focus on delivering growth and exceptional value to our customers and stakeholders."

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Matt Sassone, CEO of Tristel, commented: "Anna's appointment comes at an exciting and important time for Tristel. Her broad international background, commercial mindset, and hands-on approach to both strategy and execution are exactly what we need as we enter our next phase of growth. I have been impressed by her achievements in both large corporates and scale-up environments and am confident she will make a significant contribution to our Board and to the business."

Bruno Holthof, Chair of Tristel, commented: "We are very pleased Anna is joining as our new CFO. She brings a strong track record of driving sustainable growth and scaling up operations whilst also realising substantial savings. Anna will be supported by a committed senior management team that has built Tristel over its 20 years as a public company. The Board is confident that fusing the energy of new leadership with the organisation's remarkable domain knowledge of the infection prevention market will secure Tristel's continuing success."

Additional Information on the Board Appointment

The following additional information is provided with regards to the appointment of Anna Katarzyna Wasyl, aged 45, in accordance with AIM Rule 17 and Schedule 2(g) of the AIM Rules for Companies:

Anna does not hold any shares or options in the Company.

There are no further disclosures required under Rule 17 and Schedule 2(g) of the AIM Rules for Companies.

For further information please contact:

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, a more 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 270 people across 16 subsidiaries selling into 40+ countries. The Company targets annual revenue growth of between 10% and 15% and an EBITDA margin of at least 25% and the business is profitable, with no debt and has a progressive dividend policy.

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