Subscription Rights Rump Placing

Geiger Counter Limited (or the "Company")

7 May 2026

Exercise of outstanding Subscription Share Rights

The Company announces that further to the announcement on 6 May 2024, the Subscription Trustee has exercised all of the 6,815,308 outstanding Subscription Rights (the "Rump"). The ordinary shares of no par value in the capital of the Company ("Ordinary Shares") that arose from the exercise of the Rump have been sold by Cavendish Capital Markets Limited by way of a secondary market placing at a price of 70 pence per Ordinary Share, raising total gross proceeds for the Company of £2.5 million (based on the exercise price of 37.20 pence). The difference between the placing price and exercise price, after deduction of the costs (of exercising the Subscription Rights of the Rump and all the costs and expenses of the Subscription Trustee, the Registrar and the secondary market placing), being the resultant net proceeds, will be distributed by the Registrar to those shareholders who did not exercise their subscription rights, in proportion to their Shareholding on the Record Date, by 31 May 2026.

Accordingly, the Company announces that it will be issuing and allotting a further 6,815,308 Ordinary Shares, pertaining to the outstanding Subscription Rights exercised by the Subscription Trustee, subject to admission to trading. Application will be made for the new Ordinary Shares to be admitted to trading on the LSE. It is expected that dealings in the new Ordinary Shares will commence at 8.00 a.m. on 11 May 2026.

Following the exercise of all Subscription Rights, the Company has raised a total of £7.8 million (on the exercise price of 37.20 pence). The funds raised will be invested in a manner consistent with the stated investment objectives of the Company.

Total Voting Rights

For the purposes of the Financial Conduct Authority's Disclosure Guidance and Transparency Rules ("DTRs"), following Admission the issued ordinary share capital of the Company will consist of 173,641,396 Ordinary Shares, of which 47,838,208 shares are held in treasury by the Company, resulting in 125,803,188 Ordinary Shares with voting rights attached. This figure of 125,803,188 Ordinary Shares may be used by the Company's shareholders as the denominator for the calculation by which they will determine whether they are required to notify their interest in, or a change to their interest in, the share capital of the Company under the DTRs.

The information contained within this RNS is considered to be inside information prior to its release.

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