Notice of AGM

26 March 2026

RHI Magnesita N.V.

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

NOTICE OF 2026 ANNUAL GENERAL MEETING

RHI Magnesita N.V. (LSE: RHIM) has today published the Notice of Annual General Meeting ("AGM Notice"). The 2026 Annual General Meeting ("AGM") will be held on Wednesday, 13 May 2026 at 14.00 (CEST).

Given the successful virtual meetings since 2020, RHI Magnesita is enabling shareholders to attend and participate electronically again in 2026, and the AGM will be webcast as a hybrid meeting. Pursuant to Dutch law, there will be a physical presence in Amsterdam, but the Directors will be joining via webcast from their respective locations. A hybrid meeting will reduce costs and the environmental impact from air travel, whilst still providing open and direct contact with the Board for shareholders

More details can be found in the explanatory notes to the AGM Notice and in the AGM area of the Company's website. Shareholders are invited to submit questions in advance and will be able to attend and vote in the AGM via webcast.

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

A copy of the AGM Notice is available through the 'Investors' page within our website www.rhimagnesita.com.

Julia Crane, Company Secretary

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