Announcement PDF RNS Number : 7299Z Aterian PLC 20 October 2026 20 October 2026 Aterian Plc (“Aterian” or the “Company”) Conversion of Shore Capital Loan Notes Aterian plc (LSE: ATN), the Africa-focused critical minerals exploration, development and trading company, announces that it has received a conversion notice dated 20 October 2026 in respect of £37,500 principal amount of the Company’s outstanding zero-coupon convertible loan notes (the “CLNs”). The CLNs were subscribed for under a subscription agreement dated 16 September 2026. Pursuant to the conversion notice and the terms of the CLNs, the Company will issue 150,000 new ordinary shares of 10 pence each in the capital of the Company (“Ordinary Shares”) at a conversion price of 25 pence per Ordinary Share (the “Conversion Shares”). The Conversion Shares will rank pari passu in all respects with the Company’s existing Ordinary Shares. On conversion becoming effective, £37,500 of outstanding CLN principal will be discharged. The conversion will not generate any new cash proceeds for the Company. Application will be made for the Conversion Shares to be admitted to trading on the Main Market of the London Stock Exchange (“Admission”). Admission is expected to become effective on or around 26 October 2026. Total Voting Rights Following Admission, the Company will have 20,300,000 Ordinary Shares in issue, each carrying one voting right. The Company does not hold any Ordinary Shares in treasury. Accordingly, the total number of voting rights in the Company following Admission will be 20,300,000. Shareholders may use this figure as the denominator for calculations by which they determine whether they are required to notify their interest in, or change to their interest in, the Company’s share capital under the FCA’s Disclosure Guidance and Transparency Rules. - ENDS – This announcement contains information which, prior to its disclosure, was inside information as stipulated under Regulation 11 of the Market Abuse (Amendment) (EU Exit) Regulations 2019/310 (as amended). Engage directly with the Aterian PLC management team by asking questions, watching video summaries, and seeing what other shareholders have to say. Please navigate to our interactive investor hub here: https://aterianplc.com/s/fcf8eb For further information, please visit the Company’s website: www.aterianplc.com or contact: Aterian Plc: Charles Bray, Executive Chairman - charles.bray@aterianplc.com Simon Rollason, Director – simon.rollason@aterianplc.com Financial Adviser and Joint Broker: AlbR Capital Limited This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com. RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy. END CONLBLFLQBLLFBQ David Coffman / Dan Harris Colin Rowbury Tel: +44 (0)207 7469 0930 Joint Broker: SP Angel Corporate Finance LLP Ewan Leggat / Devik Mehta Tel: +44 20 3470 0470 Financial PR: Bald Voodoo - ben@baldvoodoo.com Ben Kilbey Tel: +44 (0)7811 209 344 Notes to Editors: About Aterian plc www.aterianplc.com Aterian plc is an LSE-listed exploration and development company with a diversified African portfolio of critical metals projects. Aterian plc is actively seeking to acquire and develop new critical metal resources to strengthen its existing asset base while supporting ethical and sustainable supply chains as the world transitions to a sustainable, renewable future. The supply of these metals is vital for developing the renewable energy, automotive, and electronic manufacturing sectors, which are increasingly important in reducing carbon emissions and meeting global climate ambitions. Aterian has a portfolio of multiple copper-silver (+gold) and base-metal projects in Morocco. Aterian holds a 90% interest in Atlantis Metals, a private Botswana-registered company holding eleven mineral prospecting licences for copper-silver in the world-renowned Kalahari Copperbelt and three for lithium and salt brine exploration in the Makgadikgadi Pans region. The Company also holds an exploration licence in southern Rwanda, where it is evaluating the tantalum and niobium opportunity, in addition to further exploring for pegmatite-hosted lithium. The Company's strategy is to seek new exploration and production opportunities across the African continent and to develop new sources of critical mineral assets for exploration, development, and trading.