NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN, INTO OR FROM THE UNITED STATES, CANADA, JAPAN, AUSTRALIA, THE REPUBLIC OF SOUTH AFRICA OR ANY OTHER JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OR REGULATIONS OF THAT JURISDICTION.

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS DEFINED IN ARTICLE 7 OF THE MARKET ABUSE REGULATION NO. 596/2014 AS IT FORMS PART OF UK DOMESTIC LAW BY VIRTUE OF THE EUROPEAN UNION (WITHDRAWAL) ACT 2018, AS AMENDED ("MAR"). UPON THE PUBLICATION OF THIS ANNOUNCEMENT, SUCH INSIDE INFORMATION IS NOW CONSIDERED TO BE IN THE PUBLIC DOMAIN AND SUCH PERSONS SHALL THEREFORE CEASE TO BE IN POSSESSION OF INSIDE INFORMATION.

UNLESS OTHERWISE DEFINED, CAPITALISED TERMS NOT OTHERWISE DEFINED HEREIN SHALL HAVE THE MEANINGS GIVEN TO THEM IN THE COMPANY'S ANNOUNCEMENT PUBLISHED AT APPROXIMATELY 6.00 P.M. (GMT) ON 02 DECEMBER 2025.

3 December 2025

QUANTUM BASE HOLDINGS PLC

("Quantum Base", the "Company" or the "Group")

Result of Placing
and
Posting of Circular and Notice of General Meeting

Quantum Base (AIM: QUBE), the quantum science company focused on creating a new global standard in authentication, is pleased to announce that, further to its announcement published on 2 December 2025 in respect of the proposed Placing, the Company has raised £4.04 million (before expenses) by way of the issue of 19,253,282 Placing Shares at the Issue Price.

As part of the Fundraising, the Company also announced details of a Retail Offer to be made to existing Shareholders and new Retail Investors to raise up to an additional £0.75 million through the issue of up to 3,571,428 Retail Offer Shares, at the Issue Price. The Retail Offer is being conducted via the RetailBook Platform. The Retail Offer is expected to close at 1.00 p.m. (GMT) on 5 December 2025, and the results of the Retail Offer will be announced later that day.

Posting of Circular and Notice of General Meeting

The Placing and Retail Offer are each conditional, inter alia, upon Shareholders approving the Resolutions at the General Meeting which is expected to be held at the Department of Physics, Physics Avenue, Lancaster University, Lancaster, LA1 4YB at 10.00 a.m. on 19 December 2025. The Circular, which contains Notice of the General Meeting in respect of the Fundraising, is expected to be posted to Shareholders on 3 December 2025 and will also be available on the Company's website at https://quantumbase.com/.

Directors' Participation

Details of the Directors' participation in the Placing is set out as follows:

Notes:

*              Assuming full take-up of the £0.75 million Retail Offer.

Related Party Transactions

Adrian Collins and Mark Fahy, Directors of Quantum Base, have agreed to participate in the Placing for 47,619 Placing Shares and 47,333 Placing Shares respectively, they currently hold approximately 0.34 per cent. and 1.10 per cent. respectively of the Existing Ordinary Shares. Therefore, the issue of Placing Shares to the Directors Adrian and Mark constitute a related party transaction pursuant to Rule 13 of the AIM Rules by virtue of their status as Directors of the Company.

The independent directors of the Company for the purpose of the Fundraising, being Tom Taylor, Robert Young, Phillip Speed and Lucy Tarleton having consulted with the Company's nominated adviser, Strand Hanson, considers the terms of Adrian Collins and Mark Fahy's participation in the Placing to be fair and reasonable insofar as the Shareholders are concerned.

Admission

Application will be made to the London Stock Exchange for the Placing Shares to be admitted to trading on AIM, which is expected to take place at 8.00 a.m. on or around 22 December 2025 (or such later date as the Company, Cavendish and Strand Hanson may agree, but in any event not later than 8.00 a.m. on 22 January 2026).

For more information, please visit https://quantumbase.com/ or contact:

IMPORTANT NOTICES

THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN IS RESTRICTED AND IS NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN OR INTO OR FROM THE UNITED STATES, AUSTRALIA, CANADA, THE REPUBLIC OF SOUTH AFRICA OR JAPAN OR ANY OTHER JURISDICTION IN WHICH SUCH RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE UNLAWFUL. MEMBERS OF THE PUBLIC ARE NOT ELIGIBLE TO TAKE PART IN THE PLACING.  THIS ANNOUNCEMENT IS FOR INFORMATION PURPOSES AND IS DIRECTED ONLY AT PERSONS WHOSE ORDINARY ACTIVITIES INVOLVE THEM IN ACQUIRING, HOLDING, MANAGING AND DISPOSING OF INVESTMENTS (AS PRINCIPAL OR AGENT) FOR THE PURPOSES OF THEIR BUSINESS AND WHO HAVE PROFESSIONAL EXPERIENCE IN MATTERS RELATING TO INVESTMENTS AND ARE: (1) IF IN THE UNITED KINGDOM, "QUALIFIED INVESTORS", BEING PERSONS FALLING WITHIN THE MEANING OF ARTICLE 2(E) OF THE UK PROSPECTUS REGULATION, WHO (A) FALL WITHIN ARTICLE 19(5) (INVESTMENT PROFESSIONALS) OF THE FINANCIAL SERVICES AND MARKETS ACT 2000 (FINANCIAL PROMOTION) ORDER 2005, AS AMENDED (THE "ORDER") OR (B) FALL WITHIN ARTICLE 49(2)(A) TO (D) (HIGH NET WORTH COMPANIES, UNINCORPORATED ASSOCIATIONS, ETC.) OF THE ORDER; (2) IF IN MEMBER STATES OF THE EEA, "QUALIFIED INVESTORS", BEING PERSONS FALLING WITHIN THE MEANING OF ARTICLE 2(E) OF THE PROSPECTUS REGULATION; OR (3) PERSONS TO WHOM THEY MAY OTHERWISE LAWFULLY BE COMMUNICATED (ALL SUCH PERSONS TOGETHER BEING REFERRED TO AS "RELEVANT PERSONS").

THIS ANNOUNCEMENT AND THE INFORMATION IN IT MUST NOT BE ACTED ON OR RELIED ON BY PERSONS WHO ARE NOT RELEVANT PERSONS.  PERSONS DISTRIBUTING THIS ANNOUNCEMENT MUST SATISFY THEMSELVES THAT IT IS LAWFUL TO DO SO.  ANY INVESTMENT OR INVESTMENT ACTIVITY TO WHICH THIS ANNOUNCEMENT RELATES IS AVAILABLE ONLY TO RELEVANT PERSONS AND WILL BE ENGAGED IN ONLY WITH RELEVANT PERSONS.  THIS ANNOUNCEMENT DOES NOT ITSELF CONSTITUTE AN OFFER FOR SALE OR SUBSCRIPTION OF ANY SECURITIES IN QUANTUM BASE HOLDINGS PLC.

THE PLACING SHARES HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") OR UNDER THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION OF THE UNITED STATES, AND MAY NOT BE OFFERED, SOLD, RESOLD OR DELIVERED, DIRECTLY OR INDIRECTLY, IN OR INTO THE UNITED STATES EXCEPT PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. THE PLACING WAS MADE SOLELY OUTSIDE THE UNITED STATES TO PERSONS IN OFFSHORE TRANSACTIONS (AS DEFINED IN REGULATION S UNDER THE SECURITIES ACT ("REGULATION S")) MEETING THE REQUIREMENTS OF REGULATION S. PERSONS RECEIVING THIS ANNOUNCEMENT (INCLUDING CUSTODIANS, NOMINEES AND TRUSTEES) MUST NOT FORWARD, DISTRIBUTE, MAIL OR OTHERWISE TRANSMIT IT IN OR INTO THE UNITED STATES OR USE THE UNITED STATES MAILS, DIRECTLY OR INDIRECTLY, IN CONNECTION WITH THE PLACING.

The distribution or transmission of this Announcement and/or the Placing and/or issue of the Placing Shares in certain jurisdictions may be restricted or prohibited by law or regulation.  Persons distributing this Announcement must satisfy themselves that it is lawful to do so. Any failure to comply with these restrictions may constitute a violation of the securities laws of any such jurisdiction. No action has been taken by the Company, Strand Hanson or Cavendish or any of their respective affiliates, agents, directors, officers or employees that would permit an offer of the Placing Shares or possession or distribution of this Announcement or any other offering or publicity material relating to such shares in any jurisdiction where action for that purpose is required.  Persons into whose possession this Announcement comes are required by the Company, Strand Hanson and Cavendish to inform themselves about and to observe any such restrictions.

This Announcement or any part of it does not constitute or form part of any offer to issue or sell, or the solicitation of an offer to acquire, purchase or subscribe for, any securities in the United States (including its territories and possessions, any state of the United States and the District of Columbia (the "United States" or the "US")), Australia, Canada, the Republic of South Africa or Japan or any other jurisdiction in which the same would be unlawful.  No public offering of the Placing Shares is being made in any such jurisdiction.

In the United Kingdom, in relation to the Placing Shares this Announcement is being directed solely at persons in circumstances in which section 21(1) of the Financial Services and Markets Act 2000 (as amended) does not apply.

The Placing Shares have not been approved or disapproved by the US Securities and Exchange Commission, any state securities commission or other regulatory authority in the United States, nor have any of the foregoing authorities passed upon or endorsed the merits of the Placing or the accuracy or adequacy of this Announcement.  Any representation to the contrary is a criminal offence in the United States.  The relevant clearances have not been, nor will they be, obtained from the securities commission of any province or territory of Canada, no prospectus has been lodged with, or registered by, the Australian Securities and Investments Commission or the Japanese Ministry of Finance; the relevant clearances have not been, and will not be, obtained for the South Africa Reserve Bank or any other applicable body in the Republic of South Africa in relation to the Placing Shares and the Placing Shares have not been, nor will they be, registered under or offered in compliance with the securities laws of any state, province or territory of Australia, Canada, the Republic of South Africa or Japan. 

Accordingly, the Placing Shares may not (unless an exemption under the relevant securities laws is applicable) be offered, sold, resold or delivered, directly or indirectly, in or into Australia, Canada, the Republic of South Africa or Japan or any other jurisdiction outside the United Kingdom.

Persons (including, without limitation, nominees and trustees) who have a contractual right or other legal obligations to forward a copy of this Announcement should seek appropriate advice before taking any action.

This Announcement includes "forward-looking statements" which includes all statements other than statements of historical fact, including, without limitation, those regarding the Company's financial position, business strategy, plans and objectives of management for future operations, or any statements preceded by, followed by or that include the words "targets", "believes", "expects", "aims", "intends", "will", "may", "anticipates", "would", "could" or similar expressions or negatives thereof. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors beyond the Company's control that could cause the actual results, performance or achievements of the Group to be materially different from future results, performance or achievements expressed or implied by such forward-looking statements. Such forward-looking statements are based on numerous assumptions regarding the Company's present and future business strategies and the environment in which the Company will operate in the future. These forward-looking statements speak only as at the date of this Announcement. The Company expressly disclaims any obligation or undertaking to disseminate any updates or revisions to any forward-looking statements contained herein to reflect any change in the Company's expectations with regard thereto or any change in events, conditions or circumstances on which any such statements are based unless required to do so by applicable law or the AIM Rules for Companies.

Strand Hanson, which is authorised and regulated in the United Kingdom by the Financial Conduct Authority ("FCA"), is acting as nominated adviser and financial adviser exclusively for the Company in connection with the Placing and Admission and is not acting for any other person and will not be responsible to any other person for providing the protections afforded to customers of Strand Hanson, or for advising any other person in connection with the Placing and Admission. The responsibilities of Strand Hanson, as nominated adviser, are owed solely to the London Stock Exchange and are not owed to the Company or the Directors or any other person. Strand Hanson is not making any representation or warranty, express or implied, as to the contents of this Announcement. Strand Hanson has not authorised the contents of, or any part of, this Announcement, and no liability whatsoever is accepted by Strand Hanson for the accuracy of any information or opinions contained in this Announcement or for the omission of any material information.

Cavendish, which is authorised and regulated in the United Kingdom by the FCA, is acting as sole broker and bookrunner exclusively for the Company in connection with the Placing and is not acting for any other person and will not be responsible to any other person for providing the protections afforded to customers of Cavendish, or for advising any other person in connection with the Placing. Cavendish will not be responsible to any person other than the Company for providing the protections afforded to clients of Cavendish or for providing advice to any other person in connection with the Placing or any acquisition of shares in the Company. Cavendish is not making any representation or warranty, express or implied, as to the contents of this Announcement. Cavendish has not authorised the contents of, or any part of, this Announcement, and no liability whatsoever is accepted by Cavendish for the accuracy of any information or opinions contained in this Announcement or for the omission of any material information.

No representation or warranty, express or implied, is or will be made as to, or in relation to, and no responsibility or liability is or will be accepted by Strand Hanson or Cavendish or by any of Strand Hanson or Cavendish's affiliates or agents as to, or in relation to, the accuracy or completeness of this Announcement or any other written or oral information made available to or publicly available to any interested party or its advisers, and any liability therefor is expressly disclaimed.

Any indication in this Announcement of the price at which the existing ordinary shares in the capital of the Company have been bought or sold in the past cannot be relied upon as a guide to future performance. Persons needing advice should consult an independent financial adviser.

The Placing Shares will not be admitted to trading on any stock exchange other than the AIM market of the London Stock Exchange.

No statement in this Announcement is intended to be a profit forecast, and no statement in this Announcement should be interpreted to mean that earnings per share of the Company for the current or future financial years would necessarily match or exceed the historical published earnings per share of the Company.

Neither the content of the Company's website (or any other website) nor any website accessible by hyperlinks on the Company's website (or any other website) is incorporated in, or forms part of, this Announcement.

Information to Distributors

UK Product Governance Requirements

Solely for the purposes of the Product Governance requirements contained within Chapter 3 of the FCA Handbook Product Intervention and Product Governance Sourcebook (the "UK Product Governance Requirements") and disclaiming all and any liability, whether arising in tort, contract or otherwise, which any "manufacturer" (for the purposes of the UK Product Governance Requirements) may otherwise have with respect thereto, the Placing Shares have been subject to a product approval process, which has determined that the Placing Shares are: (i) compatible with an end target market of (a) retail investors, (b) investors who meet the criteria of professional clients and (c) eligible counterparties, each as defined in the FCA Handbook Conduct of Business Sourcebook; and (ii) eligible for distribution through all distribution channels as are permitted by UK Product Governance Requirements (the "UK Target Market Assessment"). Notwithstanding the UK Target Market Assessment, distributors should note that: the price of the Placing Shares may decline and investors could lose all or part of their investment; the Placing Shares offer no guaranteed income and no capital protection; and an investment in the Placing Shares is compatible only with investors who do not need a guaranteed income or capital protection, who (either alone or in conjunction with an appropriate financial or other adviser) are capable of evaluating the merits and risks of such an investment and who have sufficient resources to be able to bear any losses that may result therefrom.

The UK Target Market Assessment is without prejudice to the requirements of any contractual, legal or regulatory selling restrictions in relation to the Placing. Furthermore, it is noted that, notwithstanding the UK Target Market Assessment, Cavendish will only procure investors who meet the criteria of professional clients and eligible counterparties.

For the avoidance of doubt, the UK Target Market Assessment does not constitute: (a) an assessment of suitability or appropriateness for the purposes of Chapters 9A or 10A, respectively, of the FCA Handbook Conduct of Business Sourcebook; or (b) a recommendation to any investor or group of investors to invest in, or purchase, or take any other action whatsoever with respect to, the Placing Shares.

Each distributor is responsible for undertaking its own target market assessment in respect of the Placing Shares and determining appropriate distribution channels.

EU Product Governance Requirements

Solely for the purposes of the product governance requirements contained within (a) EU Directive 2014/65/EU on markets in financial instruments, as amended ("MiFID II"), (b) Articles 9 and 10 of Commission Delegated Directive (EU) 2017/593 supplementing MiFID II and (c) local implementing measures (together the "EU Product Governance Requirements") and disclaiming all and any liability, whether arising in tort, contract or otherwise, which any "manufacturer" (for the purposes of the EU Product Governance Requirements) may otherwise have with respect thereto, the Placing Shares have been subject to product approval process, which has determined that the Placing Shares are: (i) compatible with an end target market of (a) retail investors, (b) investors who meet the criteria of professional clients and (c) eligible counterparties, each as defined in MiFID II; and (ii) eligible for distribution through all distribution channels as are permitted by EU Product Governance Requirements (the "EU Target Market Assessment"). Notwithstanding the EU Target Market Assessment, distributors should note that: the price of the Placing Shares may decline and investors could lose all or part of their investment; the Placing Shares offer no guaranteed income and no capital protection; and an investment in the Placing Shares is compatible only with investors who do not need a guaranteed income or capital protection, who (either alone or in conjunction with an appropriate financial or other adviser) are capable of evaluating the merits and risks of such an investment and who have sufficient resources to be able to bear any losses that may result therefrom.

The EU Target Market Assessment is without prejudice to the requirements of any contractual, legal or regulatory selling restrictions in relation to the Placing. Furthermore, it is noted that, notwithstanding the EU Target Market Assessment, Cavendish will only procure investors who meet the criteria of professional clients and eligible counterparties.

For the avoidance of doubt, the EU Target Market Assessment does not constitute: (a) an assessment of suitability or appropriateness for the purposes of MiFID II; or (b) a recommendation to any investor or group of investors to invest in, or purchase, or take any other action whatsoever with respect to the Placing Shares.

Each distributor is responsible for undertaking its own target market assessment in respect of the Placing Shares and determining appropriate distribution channels.