Commencement of Work at Sua Pan Lithium Project

12 November 2025

Aterian Plc ("Aterian", the "Company" or the "Group")

Commencement of Work at Sua Pan Lithium Project

Aterian PLC (LSE: ATN), the critical minerals exploration and development company, announces that it has commenced a groundwater reconnaissance and brine sampling programme at its Sua Pan Lithium Project ("Project") in the Republic of Botswana ("Botswana"). The programme is being undertaken through the Company's 90% owned subsidiary, Atlantis Metals ("Atlantis").

The work will be completed by Aqualogic (Pty) Ltd, a Botswana-based hydrogeology and geochemical consultancy with operational experience in the Makgadikgadi Basin. The programme will consist of sampling from existing wells and shallow auger locations within prospecting licences PL2621/2023, PL2328/2023 and PL2338/2023, and will establish baseline hydrogeochemical data, including lithium concentrations.

Work Programme Summary

· Building a Project database and conceptual hydrochemical model;

· Sampling of up to six existing brine wells alongside shallow near-surface sampling points;

· Field measurement of physicochemical parameters (pH, EC, temperature, TDS);

· Laboratory analysis of major ions and selected trace elements, including lithium;

· Hydrochemical interpretation and spatial assessment to identify areas for follow-up exploration.

The programme is anticipated to be completed, dependent on weather conditions, over the coming weeks, with laboratory results and interpretation to follow. A technical report will be delivered to the Company, and its conclusions will be used to define subsequent exploration steps.

Charles Bray, Chairman of Aterian, commented:

"The commencement of this programme marks a meaningful step forward in advancing our exploration strategy in Botswana. The Sua Pan project sits within a region known to host laterally extensive brine systems, and establishing the presence and distribution of lithium and other minerals within our licence areas is central to evaluating its strategic potential. Aterian is building a portfolio focused on critical minerals required for the energy transition, and this work forms part of that broader growth pathway. We look forward to reviewing the results and updating shareholders as the programme progresses."

Further updates will be provided as appropriate.

- 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).

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For further information, please contact:

Aterian Plc:

Charles Bray, Executive Chairman - [email protected]

Simon Rollason, Director - [email protected]

Financial Adviser and Joint Broker:

AlbR Capital Limited

David Coffman / Anastassiya Eley

Colin Rowbury

Tel: +44 (0)20 7469 0930

Joint Broker:

SP Angel Corporate Finance LLP

Ewan Leggat / Adam Cowl 

Tel: +44 20 3470 0470

Financial PR:

Bald Voodoo - [email protected]

Ben KilbeyTel: +44 (0)7811 209 344

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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.

The Company hold an exploration licence in southern Rwanda, where it is evaluating the tantalum and niobium opportunity, in addition to further exploring for pegmatite-hosted lithium. Aterian has a portfolio of multiple copper-silver (+ gold) and base metal projects in Morocco. Aterian holds a 90% interest in Atlantis Metals. This private, Botswana-registered company holds ten mineral prospecting licences for copper-silver in the world-renowned Kalahari Copperbelt and three for lithium brine exploration in the Makgadikgadi Pans region.

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.