Notice of AGM

RHI Magnesita N.V.

("RHI Magnesita" or the "Company" or "Group")

WITHDRAWAL AND REISSUE OF NOTICE OF 2025 ANNUAL GENERAL MEETING

The Notice of the 2025 Annual General Meeting has been withdrawn and reissued to incorporate an extra item of business, in accordance with the provisions of the Articles of Association and the Dutch Civil Code.

The additional business is the proposal to elect Franz-Ferdinand Buerstedde, a candidate proposed by Rhône Capital for election as a Non-Independent Non-Executive Director. For further details, including biographical details, please see the RNS released earlier today.

Furthermore, in accordance with Listing Rule 6.4.1, RHI Magnesita N.V. (LSE: RHIM) has submitted today the reissued Notice of the 2025 Annual General Meeting to the National Storage Mechanism. It is also now available to download from the 'Investors' page within our website at http://www.rhimagnesita.com along with the updated Form of Proxy and Form of Instruction.

The updated AGM Notice will shortly be available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism

For further enquiries, please contact:

Chris Bucknall, Head of Investor Relations

Tel: +43 699 1870 6490

E‐mail: [email protected]

Sally Caswell, Company Secretary

Tel: +43 699 1870 6345

E-mail: [email protected]

About RHI Magnesita

RHI Magnesita is the leading global supplier of high-grade refractory products, systems and solutions which are critical for high-temperature processes exceeding 1,200°C in a wide range of industries, including steel, cement, non-ferrous metals and glass. With a vertically integrated value chain, from raw materials to refractory products and full performance-based solutions, RHI Magnesita serves customers around the world, with over 20,000 employees in 65 main production sites (including raw material sites), 12 recycling facilities and more than 70 sales offices. RHI Magnesita intends to leverage its leadership in terms of revenue, scale, product portfolio and diversified geographic presence to target strategically those countries and regions benefiting from more dynamic economic growth prospects.

The Group is listed within the Equity Shares (Commercial Companies) category ("ESCC") of the Official List of the London Stock Exchange (symbol: RHIM) and is a constituent of the FTSE 250 index, with a secondary listing on the Vienna Stock Exchange (Wiener Börse). For more information please visit: www.rhimagnesita.com