Retail Offer to raise up to £0.5 million

Aptamer Group plc (AIM: APTA), the leading developer of next-generation synthetic binders delivering innovation to the life science industry, announces a retail offer via the BookBuild Platform to raise up to £0.5 million (the "Retail Offer") through the issue of new ordinary shares of 0.1 pence each in the capital of the Company ("Ordinary Shares").

Under the Retail Offer up to 83,333,333 new Ordinary Shares (the "Retail Offer Shares") will be made available at an issue price of 0.6 pence per new Ordinary Share (the "Issue Price") to existing shareholders of the Company in the United Kingdom through financial intermediaries registered with BookBuild.

Participants in the Retail Offer will receive one Warrant to subscribe for new Ordinary Shares for every three new Ordinary Shares subscribed for in the Retail Offer with an exercise price of 0.9 pence per share (being a 50% premium to the Issue Price) at any time in the two years following the date of grant. Warrants will be issued following the General Meeting and settlement of all shares to be issued in connection with the Fundraise. Warrants will be issued in either CREST or certificated form and will be transferable. No fractions of Warrants will be issued. The Warrants will not be listed on AIM or any other exchange. The Warrants are conditional on the Resolutions being passed at the General Meeting, as detailed below.

Subject to demand, the Company and Turner Pope may decide to increase the size of the Retail Offer.

In addition to the Retail Offer and as announced earlier today, the Company has conditionally raised gross proceeds of approximately £4.275 million through a placing and subscription of new Ordinary Shares (respectively, the "Placing Shares" and the "Subscription Shares", and together with the Retail Offer Shares, the "New Ordinary Shares") at the Issue Price (respectively, the "Placing" and the "Subscription", and together with the Retail Offer, the "Fundraise"). The first tranche of the Placing of approximately £1.38 million is expected to complete on or around 31 March 2026. Subject to the passing of the Resolutions at the General Meeting, as detailed below, the second tranche of the Placing along with the Subscription of, in aggregate, approximately £2.89 million is expected to complete on or around 16 April 2026.

Net proceeds from the Retail Offer will be used for the same purposes as funds raised from the Placing and the Subscription as set out in the announcement of 25 March 2026.

For the avoidance of doubt, the Retail Offer is not part of the Placing or the Subscription.

The issue of the Retail Offer Shares is conditional upon, inter alia, the passing of the Resolutions to be proposed at the General Meeting, which is expected to be held at the Company's offices at Windmill House, Innovation Way, York YO10 5BR at 11.00 a.m. on 13 April 2026. Conditional upon the passing of the Resolutions, admission of the Retail Offer Shares to trading on the AIM market operated by the London Stock Exchange ("Retail Admission") is expected to occur at 8.00 a.m. on or around 16 April 2026 (or such later time and/or date as the Bookrunners and the Company may agree (being in any event no later than 8.00 a.m. on 30 April 2026)).

Completion of the Retail Offer is conditional, inter alia, upon the completion of the Placing and the Subscription. However, completion of the Placing and the Subscription is not conditional on the completion of the Retail Offer.

Notice for EIS investors

The Company has received a written opinion that, following the proposed changes to the EIS and VCT legislation announced in the Government's Autumn Statement passing into law, the Conditional Placing, Subscription Shares and Retail Offer Shares would qualify for EIS investment. Notwithstanding the Company receiving this opinion, any investor seeking to register their holdings under either scheme is advised to seek their own advice before doing so. Tax reliefs depend on individual circumstances and the Company maintaining its opined qualifying status. Tax rules are subject to change, and if the Company loses its opined qualifying status, tax relief may be withdrawn or need to be repaid. If investors wish to seek relief under EIS, they should indicate their interest through their chosen Intermediary as part of their participation in the Retail Offer (where such facility is available) and by also emailing the Company at: corporate@aptamergroup.com.

Expected Timetable in relation to the Retail Offer

Retail Offer

The Company is therefore making the Retail Offer available in the United Kingdom only through the financial intermediaries which will be listed, subject to certain access restrictions, on the following website: https://www.bookbuild.live/deals/VQX4MQ/authorised-intermediaries.

Turner Pope Investments (TPI) Ltd ("Turner Pope") will be acting as coordinator in relation to the Retail Offer (the "Retail Offer Coordinator").

Participation of any intermediary in the Retail Offer is at the absolute discretion of the Retail Offer Coordinator.

Any expenses incurred by any intermediary are for its own account. Eligible Shareholders (as defined below) should confirm separately with any intermediary whether there are any commissions, fees or expenses that will be applied by such intermediary in connection with any application made through that intermediary pursuant to the Retail Offer.

The Retail Offer will be open to Eligible Shareholders in the United Kingdom at 7:05 a.m. on 26 March 2026. The Retail Offer is expected to close at 12:00 p.m. on 30 March 2026, but may, at the absolute discretion of the Retail Offer Coordinator, be closed early or cancelled. Eligible Shareholders should note that financial intermediaries may have earlier closing times. The Retail Offer may close early if it is oversubscribed or otherwise at the absolute discretion of the Retail Offer Coordinator or BookBuild.

If any intermediary has any questions about how to participate in the Retail Offer on behalf of Eligible Shareholders, please contact BookBuild at support@bookbuild.live.

The Retail Offer is and will, at all times, only be made to, directed at and may only be acted upon by those persons who are, shareholders in the Company. To be eligible to participate in the Retail Offer (an "Eligible Shareholder"), applicants must meet the following criteria before they can submit an order for Retail Offer Shares: (i) be a current customer of one of the participating intermediaries listed on the above website; (ii) be resident in the United Kingdom; and (iii) be a shareholder in the Company (which may include individuals aged 18 years or over, companies and other bodies corporate, partnerships, trusts, associations and other unincorporated organisations and includes persons who hold their shares in the Company directly or indirectly through a participating intermediary). For the avoidance of doubt, persons who only hold CFDs, spreadbets and/or similar derivative instruments in relation to shares in the Company are not eligible to participate in the Retail Offer.

The Company and the Retail Offer Coordinator reserve the right to scale back any order at their absolute discretion. The Company and the Retail Offer Coordinator reserve the right at their absolute discretion to reject any application for subscription under the Retail Offer without giving any reason for such rejection.

There is a minimum subscription of £100 per investor under the terms of the Retail Offer which is open to Eligible Shareholders in the United Kingdom subscribing via the intermediaries which will be listed, subject to certain access restrictions, on the following website: https://www.bookbuild.live/deals/VQX4MQ/authorised-intermediaries

There is no maximum application amount to apply in the Retail Offer except that the aggregate total consideration for the Retail Offer shall not exceed £500,000.00. The terms and conditions on which investors subscribe will be provided by the relevant financial intermediaries including relevant commission or fee charges.

Unless otherwise defined, definitions contained in this Announcement have the same meaning as set out in the announcement made by the Company on 25 March 2026.

UK Product Governance Requirements

EU Product Governance Requirements