18 March 2026

(EPIC: SRC / Market: AIM / Sector: Construction Materials)

SIGMAROC PLC

 ('SigmaRoc', the 'Group' or the 'Company')

Employee Benefit Trust Share Purchase

Sigmaroc announces that it was notified on 18 March 2026 of the following acquisition of the Company's ordinary shares by JTC Employer Solutions Trustee Limited (the "Company'), in its capacity as trustee ("the Trustee") of the SigmaEBT (the "EBT"). The Company purchased 8,540,166 Ordinary Shares at a price of 116.86 pence per Ordinary Share on 17 March 2026.

The EBT holds Ordinary Shares for the benefit of the Company's employees and satisfies the vesting of awards made under the Company's share incentive schemes. Following the above transaction, the EBT holds 11,466,889 Ordinary Shares, representing approximately 1.0% of the Company's issued share capital.

The current issued share capital of the Company consists of 1,114,854,530 Ordinary Shares. This figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in the Company, under the Disclosure Guidance and Transparency Rules of the FCA.

Information on the Company is available on its website, www.sigmaroc.com.

For further information, please contact:

About SigmaRoc

SigmaRoc is a quoted European lime and minerals Group.

Lime and limestone are key resources in the transition to a more sustainable economy. New applications for lime and limestone products as part of a drive for sustainability include the production and recycling of lithium batteries, the decarbonisation of construction including through substitution of cementitious material and new building materials, and environmental applications including lake liming, air pollution and direct air capture.

SigmaRoc invests in and acquires businesses in the lime and minerals sector. The principal activity of the Group is the production of lime and minerals products. The Group's aim is to create value for shareholders through the successful execution of its strategy in the lime and minerals sector.

SigmaRoc seeks to create value by purchasing assets in fragmented markets and extracting efficiencies through active management and by forming the assets into larger groups. It seeks to de- risk its investments through the selection of projects with strong asset backing. The Group seeks to implement operational efficiencies that improve safety, enhance productivity, increase profitability and ultimately create value for Shareholders.