5 November 2025

Quantum Base Holdings plc

("Quantum Base" or the "Company")

Board Change

Quantum Base (AIM: QUBE), the quantum science company focused on creating a new global standard in authentication, announces that, having successfully seen the Company through its IPO and first Annual Report as an AIM-quoted company, David Broadbent will be stepping down from the position of Chief Financial Officer ("CFO"), and from the Board of Quantum Base, with immediate effect.

Anthony Clayden, an experienced financial leader with a 26-year career spanning numerous executive and advisory positions, primarily in technology and life sciences, has taken the role of interim Head of Finance while the Company initiates the process to find a permanent CFO.

Anthony has previously supported six AIM-quoted companies as either CFO or Head of Finance and has advised multiple existing CFOs and boards on specific projects. Prior to these roles, Anthony worked in Corporate Finance with PwC and KPMG, advising on trade sales, fundraisings and acquisitions. He has a BSc (Hons) in Natural Sciences from Durham University and is a Qualified Chartered Accountant (FCA).

Mark Fahy, Chairman of Quantum Base, commented:

"I would first like to thank David for his invaluable contribution to Quantum Base. David was instrumental in our AIM IPO and delivering our first set of audited results, and I'm very grateful for his hard work in building a strong foundation for the Company's growth. On behalf of the Board, I wish him all the very best for the future.

"Whilst we undergo the process to find a permanent CFO, I'm delighted that Anthony is in place as interim Head of Finance. Anthony comes with a strong track record of success across a wide portfolio of permanent roles and project work. As a vastly experienced financial leader and advisor, there are very few situations that he has not encountered, and this operational expertise and strategic flexibility will be well-suited to our needs during this interim period.

"Anthony has already been supporting Quantum Base in the production of its first Annual Report as an AIM-quoted company and is therefore well-acquainted with the Group's operations and reporting processes. His appointment ensures immediate continuity in financial leadership as the Company commences the process to appoint a permanent CFO."

ENDS

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About Quantum Base

Quantum Base is a quantum science company creating a new global standard in authentication through its patented Q-ID solution - unbreakable and non-replicable authenticity tags that can be applied to a vast array of products, significantly mitigating counterfeiting.

The technology underpinning Q-IDs harnesses randomness at the atomic level, and this volume and variation ensure that there is virtually an infinite number of combinations that can be created. The Q-ID is practically impossible to replicate using even the most advanced available technology.

Q-IDs can be applied to almost any print line and can be entirely non-intrusive to a product's existing design, meaning that they can be utilised in a vast number of end markets. The authentication process to identify printed tags is undertaken using existing and unmodified smartphone technology, providing easy authentication and proven security for global brands, governments and consumers.