6 October 2025

CleanTech Lithium PLC ("CleanTech Lithium" or the "Company")

Appointment of Jersey Resident Independent Non-Executive Director

CleanTech Lithium PLC (AIM: CTL), an exploration and development company advancing sustainable lithium projects in Chile, announces that it has appointed a new Jersey resident independent non-executive director, Paul Atherton, with immediate effect.

Mr Atherton is an experienced public company director and Chartered Accountant and brings considerable financial expertise to the Board. After graduating in Geology from Imperial College, London he transitioned to a financial career qualifying as a Chartered Accountant with Deloitte & Touche. He worked in corporate finance at BDO Stoy Hayward and then a number of resource companies focused on sub- Saharan Africa before joining Heritage Oil (becoming one of the largest oil and gas company listed on the main board of the London Stock Exchange and a member of the FTSE 250) as Chief Financial Officer and then Chief Executive Officer and Executive Director. After 18 years with Heritage Oil he left to develop his interests as an angel investor and board director in a diversified portfolio of businesses including natural resources, technology and healthcare. Mr Atherton will also assume the role of Chairman of the Audit and Risk Committee of the Board.

Steve Kesler, Chairman of CleanTech Lithium, said:

"I am delighted that Paul is joining our Board as he brings the essential financial expertise and knowledge of the Jersey regulatory environment to ensure sound financial governance and decision making is continued following the recent Board restructuring. His experience in the international resource sector and in growing company value will also greatly benefit the Company."

Paul Atherton, Independent Non-Executive Director, said:

"As an investor in natural resources and technology I was attracted by CleanTech Lithium´s business proposition of developing sustainable lithium resources in Chile using Direct Lithium Extraction. I am pleased to now join the Board to help guide the Company through the next stages of development and finance into construction and production."

Board Composition

With the appointment of Mr Atherton, the Company´s Board is now made up of 3 directors as follows:

-      Independent Non-Executive Chairman - Steve Kesler

-      Independent Non-Executive Director - Paul Atherton

-      CEO - Ignacio Mehech

The Company´s Board now comprises two Independent Non-Executive Directors and one Executive Director and is in full compliance with the QCA Code on Board composition

Further AIM disclosures relating to Mr Atherton´s appointment:

Mr Paul Richard Atherton, aged 60, has held the following directorships in the past 5 years:

Paul Atherton was appointed director of Primary Care Holdings Limited on 1 May 2024, as part of a pre-pack arrangement that bought the business. Shortly thereafter, on 26 June 2024 an administrator was appointed, and Primary Care Holdings Limited has been in administration since. Filings relating to the administration, including Administrator's Progress Reports, are available for viewing free of charge from Companies House at PRIMARY CARE HOLDINGS LIMITED filing history - Find and update company information - GOV.UK  

Paul Atherton was appointed a non-executive director of Brainn Wave Limited on 11 December 2020. On 1 November 2024 administrators were appointed, and Brainn Wave Limited has been in administration since. Filings relating to the administration, including Administrators' Progress Reports, are available for viewing free of charge from Companies House at BRAINN WAVE LIMITED filing history - Find and update company information - GOV.UK

Paul Atherton was appointed a non-executive director of Brainn Wave Group Limited on 24 January 2019. On 11 December 2024 administrators were appointed, and Brainn Wave Group Limited has been in administration since. Filings relating to the administration, including Administrators' Progress Reports, are available for viewing free of charge from Companies House at BRAINNWAVE GROUP LIMITED filing history - Find and update company information - GOV.UK

Mr Atherton currently holds no ordinary shares or other securities in the Company.

There is no further information on Mr Atherton required to be disclosed under Schedule Two, paragraph (g) (i)-(viii) of the AIM Rules for Companies.

The information communicated within this announcement is deemed to constitute inside information as stipulated under the Market Abuse Regulations (EU) No 596/2014 which is part of UK law by virtue of the European Union (Withdrawal) Act 2018. Upon publication of this announcement, this inside information is now considered to be in the public domain. The person who arranged for the release of this announcement on behalf of the Company was Steve Kesler, Director and Chairman.

Beaumont Cornish Limited ("Beaumont Cornish") is the Company's Nominated Adviser and is authorised and regulated by the FCA. Beaumont Cornish's responsibilities as the Company's Nominated Adviser, including a responsibility to advise and guide the Company on its responsibilities under the AIM Rules for Companies and AIM Rules for Nominated Advisers, are owed solely to the London Stock Exchange. Beaumont Cornish is not acting for and will not be responsible to any other persons for providing protections afforded to customers of Beaumont Cornish nor for advising them in relation to the proposed arrangements described in this announcement or any matter referred to in it.

Notes

CleanTech Lithium (AIM:CTL, Frankfurt:T2N) is an exploration and development company advancing lithium projects in Chile for the clean energy transition. CleanTech Lithium has two key lithium projects in Chile, Laguna Verde and Viento Andino, and exploration stage project in Arenas Blancas (Salar de Atacama), located in the lithium triangle, a leading centre for battery grade lithium production.

CleanTech Lithium is committed to utilising Direct Lithium Extraction ("DLE") with reinjection of spent brine resulting in no aquifer depletion. Direct Lithium Extraction is a transformative technology which removes lithium from brine with higher recoveries, short development lead times and no extensive evaporation pond construction. For more information, please visit: www.ctlithium.com

**ENDS**