Application to Trade on OTCQB Market

Application to Trade on OTCQB

Altona Rare Earths plc (LSE: REE), the critical raw materials exploration and development company focused on Africa, is pleased to announce that it has applied for its ordinary shares to be admitted to trading on the OTCQB Venture Market in the United States ( "OTCQB").

The Company has submitted its application for its ordinary shares to be quoted on the OTCQB Venture Market, a recognised US trading platform for established and developing companies. No new shares will be issued in connection with the OTCQB quotation, and admission remains subject to the approval of the OTCQB and the satisfaction of applicable listing requirements. The Company's shares will continue to trade on the London Stock Exchange Main Market under the ticker "REE".

Strategic Alignment with US Engagement

This application represents a natural and strategic step following the Company's recent successful engagement with the US Trade and Development Agency (USTDA). As announced on 9 February 2026, Altona received confirmation of USTDA support for the Monte Muambe rare earths project, validating the project's relevance to US critical mineral supply chains. The signature of the grant agreement is expected to be imminent.

Enhancing Visibility and Access

The Board believes that admission to trading on the OTCQB will:

• Provide North American institutional and retail investors with the same convenience to invest as those in the UK
• Increase the Company's visibility among North American investors seeking exposure to critical minerals, particularly rare earths, as well as potential strategic partners
• Enhance liquidity and broaden the Company's shareholder base over time

The OTCQB's reporting and listing requirements align closely with those of major non-US stock exchanges, making seamless access straightforward for London Stock Exchange Main Market companies such as Altona.

Next Steps

This application represents an initial but important step in a broader strategic alignment with US partners and investors and the Board will continue to develop and evaluate supporting growth strategies as it advances the Monte Muambe rare earths project through its next phases of development.

Cedric Simonet, CEO, commented: "Our application to trade on the OTCQB follows the positive outcome of our engagement with USTDA and reflects the growing strategic alignment between Altona, our Monte Muambe project and US critical mineral priorities. With this foundational step now complete, we believe the momentum is right to begin strategically positioning the Company towards the North American capital markets."

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Altona Rare Earths Plc

Cédric Simonet, CEO +44 (0) 7778 866 108 (cs@altonare.com)

Louise Adrian, CFO +44 (0) 7721 492 922 (la@altonare.com)

Strand Hanson (Financial Adviser) +44 (0) 20 7409 3494

Christopher Raggett

Imogen Ellis

Zeus Capital (Corporate Broker) +44 (0) 20 3829 5000

Simon Johnson

James Hornigold

About Altona Rare Earths Plc

The multi-commodity Monte Muambe Project in northwest Mozambique is a highly prospective tenement hosting rare earths, fluorspar, and gallium mineralisation. Since acquiring the project in June 2021, Altona has drilled over 7,800 metres, delivering a maiden JORC Mineral Resource Estimate of 13.6Mt at 2.42% TREO, secured a 25-year mining licence (granted December 2024), and published a Competent Person Report and scoping study for the rare earths component of the project (October 2023). The US Government, via USTDA, has announced its support to advance the rare earths project through the prefeasibility stage and a grant agreement is expected to be formalized in early 2026

In parallel, Altona is progressing plans to fast-track the development of high-grade fluorspar veins identified along the western and southern margins of Monte Muambe, with a targeted production of 50,000 tonnes per annum of acid-grade fluorspar over a minimum 12-year mine life. Acid-grade fluorspar is a key input in a wide range of applications, including hydrofluoric acid, lithium battery electrolyte production, and nuclear fuel refining, placing Altona in a strong position to supply this critical material.