LETTER TO SHAREHOLDERS No. 102

6 LETTER TO SHAREHOLDER No 102 2025 RESULTS SAINT-GOBAIN NEWS Iconic Saint-Gobain projects RECOVERING VALUE FROM RESIDUAL MATERIALS TO DECARBONIZE OUR SOLUTIONS Saint-Gobain Finland has developed an innovative process to recover and repurpose solid residues from steel production (“slag”) together with steel producer SSAB. Two-thirds of production waste (metal) is reintroduced into the steelmaking process, while the remaining slag is transformed into alternative binders for Saint-Gobain construction products. New Enaé1 screeds will soon be launched in Finland and Sweden. They enable a technological breakthrough that results in a reduction of around 30%–50% in CO2 emissions over the entire product life cycle, without compromising technical performance. Overall, the process will avoid more than 20,000 tonnes of CO2 per year in the Nordic countries where the Group operates. Protected by three patents, this new technology has led to the creation in Raahe, Finland, of the world’s first plant capable of processing 70,000 tonnes of slag per year. SaintGobain’s €13 million investment, supplemented by €2 million from SSAB, has been supported by the European Union’s Recovery Fund through Business Finland. This new plant is part of Saint-Gobain Finland’s lowcarbon strategy, where 98% of products are manufactured locally. It also complements an already high-performing low carbon ecosystem in Northern Europe, which includes: • in Finland: glass wool produced in Forssa at the lowest carbon glass wool plant in the world, and low carbon concrete additives manufactured in Hyvinkää; • in Norway: the world’s first zero carbon (scope 1 and 2) plasterboard production site in Fredrikstad. Challenges 1. Enaé: low-carbon glue RENOVATION OF STOCKUM BWB - DÜSSELDORF, GERMANY 13 Saint-Gobain solutions RENOVATION OF WEXNER HOSPITAL - OHIO, US 8 Saint-Gobain solutions METRO LINE 4 - CAIRO, EGYPT 8 Saint-Gobain solutions H RESIDENCE - DUBAI, UAE 18 Saint-Gobain solutions LIGHT & SUSTAINABLE SOLUTIONS FOR RESIDENTIAL NON-RESIDENTIAL INFRASTRUCTURE DWIGHT INTERNATIONAL SCHOOL - HANOI, VIETNAM 7 Saint-Gobain solutions SIR ANEROOD JUGNAUTH BRIDGE - MAURITIUS 8 Saint-Gobain solutions LIGHT & SUSTAINABLE SOLUTIONS FOR LIGHT & SUSTAINABLE SOLUTIONS FOR

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