2 February 2026

Quantum Base Holdings plc

("Quantum Base" or the "Company")

Director Dealings

Quantum Base (AIM: QUBE), the quantum science company focused on creating a new global standard in authentication, has been notified that Mark Fahy, Chairman of Quantum Base, has undertaken transactions in Company shares to facilitate a Bed & ISA transfer.

On 30 January 2026, Mark Fahy sold a total of 117,647 ordinary shares of 1 pence each ("Ordinary Shares") in the Company at a price of 24 pence per share and then purchased 117,487 Ordinary Shares at a price of 24.03 pence into his ISA account.

As a result, Mark Fahy's beneficial holding in the Company is 743,900 Ordinary Shares, representing 0.88% of the issued share capital of the Company.

ENDS

For further information, please contact:

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.