4 October 2023

ROCKWOOD STRATEGIC PLC

("Rockwood Strategic" or the "Company")

Share Sub-division

As announced in its annual report for the year ended 31 March 2023, the Company sought shareholder approval at its Annual General Meeting held on 12 September 2023 (the "AGM") to sub-divide each of its existing ordinary shares on a ten for one basis (the "Share Sub-division"). The resolution to approve the Share Sub-division was passed at the AGM. Accordingly, further details of the Share Sub-division, together with a corporate action timetable, are set out below.

Under the Share Sub-division, each ordinary share of 50 pence each in the capital of the Company (the "Existing Ordinary Shares") will be sub-divided into ten new ordinary shares of 5 pence each in the capital of the Company (the "New Ordinary Shares").

On 11 October 2023, being the effective date for the Share Sub-division, the price of each New Ordinary Share will become one tenth of the price of each Existing Ordinary Share. This will reflect the fact that shareholders will own ten times as many New Ordinary Shares as they did Existing Ordinary Shares. Shareholders should however note that, subject to market movements, the aggregate value of their shareholdings will remain the same. Additionally, the Share Sub-division will not have any impact on the Company's net assets as no change in the total aggregate nominal value of the Company's issued share capital will occur. The New Ordinary Shares will carry the same rights in all respects as the Existing Ordinary Shares, including voting rights. Mandates and other instructions for the payment of dividends and communication preferences will continue to apply to the New Ordinary Shares.

The New Ordinary Shares will be in registered form and may be held in certificated or uncertificated form. Following the Share Sub-division becoming effective, share certificates in respect of the Existing Ordinary Shares will cease to be valid and will be cancelled. New certificates in respect of the New Ordinary Shares will be issued to those shareholders who hold their Existing Ordinary Shares in certificated form.

The Share Sub-division is conditional on the New Ordinary Shares being admitted to the Official List of the Financial Conduct Authority and to trading on the main market of the London Stock Exchange. Applications for admission have been made and it is expected that the Share Sub-division will become effective and that dealings in the New Ordinary Shares will commence at 8.00 a.m. on 11 October 2023.

A full timetable for the Share Sub-division is provided below:

The ticker for the New Ordinary Shares will remain the same as the ticker for the Existing Ordinary Shares (RKW).

The New Ordinary Shares will have a new ISIN and SEDOL, as follows:

ISIN: GB00BRRD5L66

SEDOL: BRRD5L6

A further announcement confirming the number of shares in issue and the total voting rights following the Share Sub-division will be released on 11 October 2023.

For further information, please contact: