LETTER TO SHAREHOLDERS No. 101

5 LETTER TO SHAREHOLDERS N°101 FOCUS... With generative AI, SaintGobain optimizes material design, anticipates the needs of smart buildings, and operates its factories with unprecedented precision. In terms of digital tools, the Group uses 3D modeling, digital twins, and collaborative platforms to design faster, produce better, and communicate more effectively. These technologies help reduce the environmental impact of its solutions while enhancing their performance and circularity. To celebrate its 360th anniversary and its commitment to sustainable construction, SaintGobain launched the international campaign “360 Years Young” in January 2025. For Benoit Bazin, “Celebrating our 360th anniversary bears testimony to the pioneering and innovative spirit in everything we do. We want to pay tribute to the collective daily commitment of our teams towards building a more sustainable future, but also to our solutions which create value and have a positive impact on people and the planet. Nine countries are in the spotlight as part of this campaign, each highlighting innovative solutions that embody the Group’s legacy and forward-looking vision. To bring this ambition to life throughout 2025, Saint-Gobain has enlisted two prominent figures: François Gemenne, a climate change expert and contributor to the Intergovernmental Panel on Climate Change (IPCC1), and Charlotte Kan, a journalist who has worked with numerous international media outlets. Their brief is to engage with employees, clients, and partners in order to showcase both local and global initiatives, as well as the Group’s flagship achievements in these different countries. After the US in February, Brazil in March, South Africa in April, Australia in May and China in June, it will be India’s turn to showcase its strengths in July. As autumn begins, the two travelers will visit the United Arab Emirates in September, Poland in October, and finally France, concluding this months-long global adventure. You can find out details about the entire trip on SaintGobain’s website. 2025: STRENGTHENING THE LOCAL MODEL Saint-Gobain has successfully built an international brand through a decentralized, country-by-country approach tailored to the specific needs of its customers. This strategy has earned the Group a strong reputation across all continents, while maintaining its roots in France. Its positioning and strategic plans — “Transform & Grow” followed by “Grow & Impact” — have been key to its success. Its business model, along with the acquisition and integration of companies worldwide (most recently CSR, FOSROC, Cemix, etc.), provides the Group with strong, expert commercial brands that are well-established in each of its markets. Following the Shareholders’ Meeting on June 5, 2025, Chairman and CEO Benoit Bazin announced a new phase of transformation to accelerate growth2. Saint-Gobain is reinforcing its local organizational model to support the increasing regionalization of its customers — particularly in industry — and to adapt to the global geopolitical environment. Since July 1, 2025, all of the Group’s solutions are now managed at the country level, as close as possible to customers. Saint-Gobain already benefits from local value chains (industrial sites, logistics, procurement, brands, sales, and customers), with no direct exposure to customs barriers, and from the regionalization of its major innovation centers located in Europe (France and Germany), the United States, India, Brazil, and China. Country CEOs now oversee the entire Saint-Gobain solutions portfolio, including those previously managed within High Performance Solutions, such as construction chemicals and industrial solutions. The local management of all product lines is designed to accelerate sales growth in each market segment and address an increasingly fragmented geopolitical environment. Against this backdrop, Saint-Gobain stands out for its fully decentralized organization, which gives each local entity strategic and operational autonomy across the Group’s entire range of solutions, allowing it to effectively adapt to the specific characteristics of each market “To maximize our operational performance and ensure the deployment of our full offering and best industrial, digital, and commercial practices across countries, a Group Operations Department has been created to work alongside me,” said Benoit Bazin. In terms of reporting, the Group will now publish its financial results across four regions: Northern Europe, Southern Europe – Middle East and Africa, Americas and Asia-Pacific. Saint-Gobain will present its new strategy and profitable growth trajectory under this new organization during its Capital Markets Day on October 6, 2025. 1. Scientific body of the United Nations (UN) responsible for assessing knowledge on climate change, its consequences, and ways to address it. 2. Press release dated June 5, 2025: deepening of the local model and changes in the Executive Committee as of July 1, 2025.

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