30 September 2025

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

Additional Funding to Secure Growth

Aterian plc (LSE: ATN), the critical mineral exploration and development company, is pleased to announce it has successfully secured US$325,000 of mezzanine funding to support general operations and expand trading activities in the Republic of Rwanda ("Rwanda"), with a focus on the acquisition and sale of tantalum-niobium ("Coltan") concentrate.

The funding is being advanced alongside the Company's partnership with a leading metals and minerals trading house with a global presence. This collaboration enables the Company to scale rapidly and position itself as a significant supplier of responsibly sourced Central African minerals.

To complement this funding, Aterian has issued 1.043 million warrants to the mezzanine funding investors following the expiry of 0.50 million outstanding warrants, providing investors the opportunity to participate in the Company's growth trajectory. The newly issued warrants have a 40 pence exercise price and expire 30 December 2027.

Chairman's Statement - Building Momentum

Charles Bray, Executive Chairman of Aterian, commented:

"This funding marks yet another a very exciting milestone for Aterian and our trading business. Not only does it strengthen our working capital, but it also unlocks the ability to accelerate growth and broaden our reach to a network of world-class downstream buyers. 

We are now entering a new chapter where Aterian is not only an exploration company but also an active and growing trading business. Our rigorous focus on traceability, ESG compliance, and supply chain integrity provides us with a strong competitive edge. This is the beginning of what I believe will be a transformative period for the Company, and I look forward to updating shareholders as we build further momentum across our portfolio."

Key Terms of the Loan

·      Principal Amount: US$325,000

·      Interest & Fees: 20.0% interest and 2% trading fees

·      Term: Initial six months, extendable thereafter by mutual agreement

·      Guarantee: Aterian plc guarantees the performance of Eastinco Ltd under the facility

Responsible Sourcing & ESG

All mineral supplies handled by Aterian comply with International Tin Supply Chain Initiative (ITSCI) standards and the OECD Due Diligence Guidance. The Company has implemented rigorous onboarding and audit procedures, including on-site inspections, mine-origin verification, and conflict-free certification. These measures underpin Aterian's position as a reliable and transparent partner for international buyers increasingly focused on ESG-aligned procurement.

Strategic Outlook

This development represents a yet another step forward in Aterian's strategy to create a vertically integrated exploration and trading platform across Africa, focused on responsibly sourced critical minerals. With the secured mezzanine funding and its partnership, Aterian is well positioned to deliver on its growth ambitions while creating long-term value for shareholders.

Further updates on trading performance and supply expansion will follow in due course.

- 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 with the Aterian PLC management team directly by asking questions, watching video
summaries, and seeing what other shareholders have to say. Navigate to our interactive investor
hub here: https://aterianplc.com/s/fcf8eb

For further information, please contact:

Aterian Plc:

Charles Bray, Executive Chairman - [email protected]

Simon Rollason, Director - [email protected]

Financial Adviser and Joint Broker:

Novum Securities Limited

David Coffman

Colin Rowbury

Tel: +44 (0)207 399 9400

Joint Broker:

SP Angel Corporate Finance LLP

Ewan Leggat / Adam Cowl 

Tel: +44 20 3470 0470

Financial PR:

Bald Voodoo - [email protected]

Ben Kilbey
Tel: +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 has entered into a joint venture agreement with Rio Tinto Mining and Exploration Limited. Rio Tinto is earning into the HCK project in southern Rwanda, exploring and developing a lithium-tantalum-niobium-tin mining operation. The Company also holds an exploration licence in Rwanda. 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.