THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN IS RESTRICTED AND IS NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, IN WHOLE OR IN PART, IN OR INTO, THE UNITED STATES (INCLUDING ITS TERRITORIES AND POSSESSIONS, ANY STATE OF THE UNITED STATES OR THE DISTRICT OF COLUMBIA), CANADA, AUSTRALIA, JAPAN, NEW ZEALAND, THE REPUBLIC OF SOUTH AFRICA OR ANY OTHER JURISDICTION IN WHICH THE SAME WOULD BE UNLAWFUL.

For immediate release

27 April 2026

ATOME PLC

("ATOME" or the "Company")

Posting of Circular and Notice of General Meeting

Further to the Company's announcements of 23 April 2026, ATOME (AIM: ATOM), the world-leading low-carbon fertiliser developer and the UK's only dedicated international industrial scale low-carbon fertiliser company, is today publishing a Circular to be sent to shareholders, containing a Notice convening a General Meeting of the Company to be held at 11.00 am on 13 May 2026 at The Royal Army & Navy club, 36 Pall Mall, London, SW1Y 5JN.

Copies of the Circular, Notice of General Meeting and Proxy Form will be made available on the Company's website at: https://www.atomeplc.com/investors/documents-circulars/.

General Meeting

The Circular contains a Notice convening a General Meeting of the Company to consider and, if thought fit, approve resolutions relating to, inter alia, the Villeta Transaction and the Casale Subscription.

The Board unanimously recommends the passing of the relevant resolutions as referred to in the Circular.

For further information on ATOME, please visit the Company's Curation Connect showcase at: https://app.curationconnect.com/company/Atome-71605

Capitalised terms used but not otherwise defined in this announcement shall have the meanings ascribed to such terms in Appendix III of the Company's announcement on 23 April 2026 at 5.22 p.m. unless the context requires otherwise.

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

About ATOME

ATOME PLC is an AIM-listed company targeting green fertiliser production with 445-megawatt of projects in Paraguay and a further pipeline of potential projects in Central America. ATOME has now created its ATOME POWER division which is in the early stages of developing a significant green power generation and infrastructure business. ATOME's projects are situated at the heart of one of the world's largest food export hubs - the Mercosur region in the Southern Cone of South America with the Argentinian and Brazilian markets next door. ATOME's production will disrupt the region's heavy dependence on imported fossil fuel generated fertilizer, contributing to regional food security goals.

ATOME's first project in Villeta, Paraguay, benefits from a 125MW renewable power purchase agreement and a 30-hectare site in a tax-free zone, Front End Engineering Design studies have been completed and a 10-year Definitive Offtake Agreement signed with Yara International, the leading international fertiliser company, for offtake of all of Villeta's green fertiliser production, as well as a US$465 million fixed-price EPC contract with leading ammonia and fertiliser engineering specialist Casale S.A. ATOME declared Final Investment Decision on the Villeta Project (subject to shareholder approval) in April 2026 following completion of US$665 million project finance with construction to commence in 2026.

All power for ATOME is from 100% renewable sources and all chosen sites are located close to the power and water sources and export facilities to serve significant domestic and then international demand. Roughly a third of human caused GHG emissions is linked to food production according to UN data, and fertiliser use and production is the source of more emissions than the shipping and aviation industries combined. ATOME's green Calcium Ammonium Nitrate product will contribute to decarbonising the food sector from the bottom up, getting to the root of the food value chain's emissions. ATOME's renewably generated fertiliser is both low-carbon and provides a secure, stable alternative product not reliant on fossil fuels, unlike all nitrogen fertilizer production today.

The Company has a green-focused Board which is supported by major shareholders including Peter Levine, Schroders, a leading fund manager, and Baker Hughes, a global technology company operating in the energy and industry sectors.

Other information

Beaumont Cornish Limited ("Beaumont Cornish") is the Company's Nominated Adviser and is authorised and regulated by the FCA. Beaumont Cornish's responsibilities as the Company's Nominated Adviser, including a responsibility to advise and guide the Company on its responsibilities under the AIM Rules for Companies and AIM Rules for Nominated Advisers, are owed solely to the London Stock Exchange. Beaumont Cornish is not acting for and will not be responsible to any other persons for providing protections afforded to customers of Beaumont Cornish nor for advising them in relation to the proposed arrangements described in this announcement or any matter referred to in it.

-ends-