Retail Offer to Shareholders

On 11 August 2025, CleanTech Lithium PLC ("CleanTech Lithium" or the "Company"), an exploration and development company advancing lithium projects in Chile for the clean energy transition, announced that it had conditionally raised gross proceeds of £4.3 million by way of a placing of 86,000,000 new ordinary shares (the "Placing Shares") at a price of 5 pence per new ordinary share (the "Issue Price") (the "Placing").

The Company also granted a broker option to Fox-Davies Capital Limited ("Fox-Davies"), pursuant to which an additional £400,000 has been conditionally raised by way of a further placing of 8,000,000 new ordinary shares (the "Broker Option Shares") at the Issue Price (the "Broker Option") (the Placing and the Broker Option together being, the "Fundraising" and the Placing Shares and the Broker Option Shares together being, the "Fundraising Shares").

As part of the Fundraising, the Fundraising Shares carry a warrant entitlement of one warrant ("Warrant") for every Fundraising Share. Each Warrant grants the holder the right to subscribe for one new ordinary share at a price of 6 pence, being at a 20% per cent premium to the Issue Price, at any time from one year after the date of Second Admission until up to and including the date which is 3 years from the date of Second Admission.

In view of the potential interest of retail shareholders in participating in the Fundraising, the Company is pleased to announce a retail offer via BookBuild (the "Retail Offer") of new ordinary shares (the "Retail Offer Shares") at a price of 5 pence, which is the Issue Price, per Retail Offer Share together with one Warrant for every Retail Offer Share. The Retail Offer is only being made available to existing shareholders of the Company on the same financial terms as the Fundraising.

The Issue Price represents a discount of approximately 26 per cent. to the closing share price of 6.75 pence per ordinary share on 8 August 2025, being the last practicable date prior to publication of the Fundraising announcement on 11 August 2025.

The amount raised pursuant to the Retail Offer will not exceed £250,000.

The Retail Offer is conditional on:

• the passing of resolutions (the "Resolutions") to authorise the issue of, inter alia, the Retail Offer Shares and the Warrants at a general meeting of the Company to be held at 10:00 a.m. BST on 29 August 2025 (the "General Meeting").
• the Retail Offer Shares being admitted to trading on the AIM market operated by the London Stock Exchange ("Second Admission").

It is expected that Second Admission will take place on or about 1 September 2025.

The net proceeds from the Broker Option and the Retail Offer would be applied, in the same way as the net proceeds of the Placing, to fund the initial payments for the binding SPA the Company has signed for the acquisition of an additional 30 licences in the Laguna Verde project ("the Minergy Licences"), the final PFS payments for Laguna Verde, DLE technical work and general working capital requirements

Expected Timetable in relation to the Retail Offer

Retail Offer

The Company values its retail shareholder base, which has supported the Company alongside institutional investors since IPO in 2022. Given the support of retail shareholders, the Company believes that it is appropriate to provide its retail shareholders in the United Kingdom the opportunity to participate in the Retail Offer. The Company is therefore making the Retail Offer available in the United Kingdom through the financial intermediaries which will be listed, subject to certain access restrictions, on the following website: https://www.bookbuild.live/deals/W7L457/authorised-intermediaries

Fox-Davies Capital Limited will be acting as sole retail offer coordinator in relation to this Retail Offer (the "Retail Offer Coordinator").

If any intermediary has any questions about how to participate in the Retail Offer on behalf of existing retail shareholders, please contact the Retail Offer Coordinator at daniel@fox-davies.com or BookBuild at email: support@bookbuild.live.

The new ordinary shares will, when issued, be credited as fully paid and will rank pari passu in all respects with existing 122,736,154 ordinary shares including the right to receive all dividends and other distributions declared, made or paid after their date of issue.

There is a minimum subscription of £100.00 per investor under the terms of the Retail Offer which is open to investors in the United Kingdom subscribing via the intermediaries which will be listed, subject to certain access restrictions, on the following website: https://www.bookbuild.live/deals/W7L457/authorised-intermediaries

Words and expressions defined in the Launch Announcement at 7am on 11 August 2025 shall have the same meaning in this announcement.

CleanTech Lithium PLC Registration number: 139640 Registered office: 7 Castle Street, St Helier, JE2 3BT, Jersey Ignacio Mehech/Gordon Stein/Nick Baxter

Office: +44 (0) 1534 668 321 Mobile: +44 (0) 7494 630 360 Chile office: +562-32239222

The Company's LEI is 213800Y3TN5JQCDA9U59.

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