04 June 2026

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

Appointment of Independent Non-Executive Director

CleanTech Lithium (AIM: CTL, Frankfurt:T2N), an exploration and development company advancing sustainable lithium projects in Chile, is pleased to announce that Leo Koot will be joining the Board effective immediately following First Admission (details of which are contained in the Launch Announcement published earlier today) expected to take place on 10 June 2026.

Mr Koot has since August 2025 acted as a Board Observer on behalf of the Convertible Loan Noteholders ("CLN Holders")and as announced earlier today the CLNs are now being converted effective on First Admission.  However, the Directors have valued Mr Koot's advice and support over the last few month and have invited him to join the Board as an independent non-executive director and also as a chair of the Remuneration and Nomination Committees of the Board. Mr Koot brings more than 30 years of experience in financing and developing projects across the energy and natural resources sector. His career spans complex, capital-intensive projects at the international level, including the navigation and delivery of a billion-dollar project in the Middle East.

Steve Kesler, Non-Executive Chairman of CleanTech Lithium, said:

"CleanTech Lithium is at a pivotal stage in its development. With the Pre-Feasibility Study for Laguna Verde now complete and the strategic partner process underway, the Company is on track to scale battery-grade lithium production from one of the world's premier lithium jurisdictions. Leo's appointment brings precisely the depth of project development and financing expertise that the Board is looking for to navigate this next phase and we look forward to working with Leo as we deliver on the milestones ahead."

Leo Koot, Independent Non-Executive Director, said:

"I am delighted to be joining the Board of CTL as an independent non-executive director after being a Board Observer since August 2025. I saw the real potential of the Company in late 2021 and invested in the Pre-IPO raise at that time and in other fundraises since then. Whilst the Company has seen many challenges since my first investment in a difficult global lithium market, it is now clear that CTL is very well placed to progress its Laguna Verde project. 

I look forward to contributing to the Board as we look to bring on board a strategic partner later this year and believe my experience of driving major projects forward will bring value to the CTL Board."

Further information on Mr Koot

Mr Koot is currently Chairman of Tulip Oil Holdings B.V. which recently completed the divestment of its Dutch gas portfolio for an approximate consideration of €380 million. At the time of sale Tulip Oil BV was one of the largest offshore gas producers in The Netherlands. He also serves as Non-Executive Director of AIM traded Beacon Energy PLC and was previously Executive Chairman of Columbus Energy Resources PLC, an AIM traded oil and gas exploration, development and production company which had assets in Trinidad and Suriname.

Prior to this, Mr Koot was President for the Abu Dhabi National Energy company (TAQA) Iraq's start-up business. TAQA established itself as one of the main Energy companies involved in building the Kurdistan region of Iraq's economy. As Managing Director for TAQA's UK business, Mr Koot set up the company and transitioned six major United Kingdom Continental Shelf (UKCS) offshore North Sea operated assets into the TAQA portfolio. Mr Koot is a partner at MENA-GULF Investment Partners.

Mr Koot has held various roles including CEO, Regional Manager, Project Manager, Operations Manager and Drilling Supervisor. Mr Koot is a qualified Petroleum Engineer having graduated in Applieed Earch Science from Delft University of Technology.

Mr Leo Willem Koot (age 63) has held the following directorships and / or parnetnerships in the past 5 years:

Mr Koot has been a CTL shareholder since December 2021 and he currently holds 708,215 Ordinary Shares representing 0.35 per cent. of the Company's existing share capital. Following conversion of the CLNs expected to become effective on First Admission (10 June 2026) Mr Koot will be interested in 2,392,717 Ordinary Shares in the Company representing 0.78 per cent. of the Company's enlarged issued share capital following First Admission. Mr Koot also holds 52,083 warrants in the Company.

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

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**