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.

9 June 2026

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

Notice of General Meeting and Publication of Circular

Further to the announcement of its Fundraising on 4 June 2026 (the "Launch Announcement"), CleanTech Lithium PLC, (AIM: CTL), an exploration and development company advancing sustainable lithium projects in Chile, is pleased to announce that it is today publishing its circular to Shareholders, including a notice of general meeting (the "Circular"). The general meeting will be held at the offices of the Company at de Carteret House, 7 Castle Street, St Helier, Jersey, JE2 3BT on 1 July 2026 at 10.00 a.m. (the "General Meeting").

The detailed reasons for and background to the Resolutions are set out in the Circular. The Circular will shortly be available on the Company's website https://ctlithium.com/investors/circulars-documents/.

Should the Fundraising Resolutions at the General Meeting not be passed, the Conditional Placing, the Subscription and the Retail Offer will not complete, and the Company would only receive the net proceeds of the Firm Placing.  Accordingly, the Directors believe that it is critical that Shareholders vote in favour of the Fundraising Resolutions, as the Directors consider the Fundraising to represent the best possible option for Shareholders as a whole in order for the Company to progress its operations as outlined in the Circular.

Words and expressions defined in the Launch Announcement shall have the same meaning in this announcement.

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

Appendix

EXPECTED TIMETABLE OF PRINCIPAL EVENTS

Notes:

References to times are to London time unless otherwise stated.

The times and dates set out in the expected timetable of principal events above may be adjusted by the Company in which event the Company will make an appropriate announcement to a Regulatory Information Service giving details of any revised dates and the details of the new times and dates will be notified to the London Stock Exchange and, where appropriate, Members. Members may not receive any further written communication.