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.

16 June 2026

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

Director Subscription

CleanTech Lithium PLC (AIM: CTL, Frankfurt:T2N), an exploration and development company advancing sustainable lithium projects in Chile, announces that Steve Kesler, Non-Executive Chairman, has subscribed for 4,604,550 new Ordinary Shares in the Company (the "Subscription Shares") at a price of 6 pence per share.

As set out in "the Fundraising and Conversion of Loan Notes" announcement published on 4 June 2026 ("Launch Announcement"), Steve Kesler confirmed his intention to subscribe for the Subscription Shares to settle accrued director's fees owed to him by the Company. Following the announcement of the Company's financial results for the year ended 31 December 2025, the Company is no longer in a closed period, and Steve Kesler is now permitted to subscribe for the Subscription Shares. On the same basis as the Fundraising, the Subscription Shares carry a warrant entitlement of one Warrant for every two Subscription Shares subscribed for.  Each Warrant grants the holder the right to subscribe for one new Ordinary Share at a price of 9 pence per share. 

The Subscription as well as the grant of Warrants remains subject to the Resolutions being passed at the General Meeting to be held on 1 July 2026.

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

**ENDS**