05 November 2025

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

Temporary Amendment of Warrant Exercise Price

Aterian plc (LSE: ATN), the critical and strategic metals-focused exploration and trading company, announces that the directors have approved a temporary amendment to the terms of the Company's Series 12 Warrants, which were issued on 12 October 2022 and are due to expire on 30 December 2025.

Under the amendment, the effective exercise price of the Series 12 Warrants will immediately,  and temporarily, be reduced for a two-week period from 150 pence per share to 32.5 pence per share. This amendment will apply only where the Company receives a notice of exercise and the full consideration on or before 21 November 2025.

Following that date, the exercise price of the Series 12 Warrants will revert to 150 pence per share for the remainder of the warrant term.

The Board believes this amendment provides warrant holders with an opportunity to participate in the Company's recent equity placing price, while also strengthening Aterian's balance sheet through potential new capital inflows.

- 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. Please 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:

AlbR Capital Limited

David Coffman / Anastassiya Eley

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 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.