22 April 2026

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

Update to Legal Claim in Chile

CleanTech Lithium (AIM: CTL, Frankfurt: T2N), an exploration and development company advancing sustainable lithium projects in Chile, provides an update in relation to a legal claim involving its wholly owned subsidiary CleanTech Laguna Verde SpA ("CLV").

As previously reported on 1 December 2025, a civil legal claim was lodged by the vendors of 23 mining concessions at Laguna Verde (the "LV Vendors") against CLV in relation to the non-payment of the second instalment as part of the sales and purchase agreement, details of which were announced on 22 April 2024. While there has been no further developments of that civil claim, the Company understands that a related criminal complaint has now been filed by the LV Vendors to a local court in the Atacama Region against CLV, CleanTech Lithium Ltd and Atacama Salt Lakes SPA, both subsidiaries of the Company, and certain Directors and Officers of the group, covering substantially the same matters.

These allegations are denied by the parties concerned and the Company views these in the context of the previously announced contractual dispute. The Company does not believe that this new legal action has any impact on its operations and strategic plans but will provide further updates to the market as appropriate.

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 and the Mining Ministry in Chile have agreed the contractual terms for the Special Lithium Operating Contract ("CEOL") for Laguna Verde, subject to final ratification.

CleanTech Lithium is committed to utilising Direct Lithium Extraction ("DLE") with reinjection of spent brine. 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

Previously reported announcements relevant to the subject of this announcement:

01 December 2025 - Legal action against subsidiary of CleanTech Lithium

20 October 2025 - Update to Certain Laguna Verde Licence Payments

22 October 2024 - Update to Laguna Verde Licence Payment Terms

22 April 2024 - Acquisition of Laguna Verde licences previously held under option and Issue of Convertible Loan Notes

**ENDS**