THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN IS RESTRICTED AND IS NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN, INTO OR FROM THE UNITED STATES, AUSTRALIA, CANADA, JAPAN, NEW ZEALAND, THE REPUBLIC OF SOUTH AFRICA OR ANY OTHER JURISDICTION IN WHICH SUCH RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE UNLAWFUL.

25 June 2026

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

CEOL Update and CFO Position

CleanTech Lithium PLC (AIM: CTL, Frankfurt:T2N), an exploration and development company advancing sustainable lithium projects in Chile, shares an update on the CEOL process and CFO position.

CEOL Update

The Company had expected ratification of the CEOL to take place in Q2 2026, however, the administrative process with the Comptroller General's Office is taking longer than anticipated as it works through all the CEOL decrees put forward by the previous Government. CEO Ignacio Mehech has met with the new Government representatives on several occasions and is encouraged by their support for the Company's ambitions at Laguna Verde and looks forward to the signing of the CEOL later this year.

CFO Position

It was announced on 11 August 2025 that CFO and Director Gordon Stein would step down from the Board as a director but remain as CFO. The Board engaged Mr Stein under a consulting agreement in February 2026 to lead the process to select a strategic partner to fund the next stage of project development and also to progress the dual listing on the ASX and as these matters are ongoing, Mr Stein's consulting agreement has now been extended from 30 June 2026 to the end of September 2026 when it will be reviewed again.

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

**ENDS**