LETTER TO SHAREHOLDERS No. 100

STRATEGY WOMEN IN CONSTRUCTION, AN ONGOING (R)EVOLUTION Within the Group, gender equality is more than just an objective: it is a catalyst for sustainable performance. The feminization of professions in construction, a traditionally male-dominated sector, is a process that requires a continuous change in practices as well as in mentalities and representations of the sector. Such a transformation requires constant awareness of these issues. All our employees, through their career paths, bear witness to the importance of addressing gender equality, and are committed to ensuring that the construction professions are not gender-biased. In line with this ambition for a sector accessible to all, since 2021 the Group has been a signatory of the United Nations’ Women’s Empowerment Principles, a set of principles designed to help companies promote gender equality and the empowerment of women in the working environment. In 2023, and for the fifth consecutive year, the Group was listed in the Bloomberg Gender Equality Index, a benchmark that measures gender equality across five key criteria: leadership and talent pool, equal pay, inclusive culture, anti-sexual harassment policies and brand image. In 2025, SaintGobain will continue to create and support major initiatives, including a target of recruiting 40% female managers. INNOVATION FIRST PLASTERBOARD WITH 100% RECYCLED PLASTER This is a world first for the Group: after launching the first plasterboard containing at least 50% recycled plaster in France in 2022, Saint-Gobain launched its first plasterboard made from 100% recycled plaster in the UK on January 16, 2025. Gyproc SoundBloc Infinaé 100 marks a major step towards greater circularity. Developed by British Gypsum, a Saint-Gobain subsidiary in the UK, it uses waste plaster from construction sites. These materials are then integrated into the production process to create new, high-quality plasterboard, supporting the circular economy and helping construction companies achieve their sustainability goals. Building on its recycling expertise, British Gypsum offers a collection service for building site materials, covering not only plasterboard but also products such as drywall adhesives and plasters. MARKETS AND CUSTOMERS FROM WASTERIALS TO MORE SUSTAINABLE SOLUTIONS One person’s waste can be another’s treasure. Building on this philosophy, Indonesian R&D center teams deployed numerous innovative initiatives to reduce raw materials emissions, with one of the most promising using wasterials, i.e., materials made from waste. Working with teams from Mortar Utama, a Group subsidiary and Indonesia’s leading mortar manufacturer, R&D teams set out to reduce the carbon footprint of the cement binder used in their solutions. To do so, they first looked at different by-products of various power plants and steel manufacturers in search of the best candidate for a wasterial binder that would have a similar chemical content to a traditional binder. Once found, through repeated research and trials, they partially substituted (currently by up to 65%) the cement binder with the wasterial, while maintaining the performance of the finished solution. The teams developed a formulation which was tested in various production processes (plaster, facing plaster, tile adhesive, etc.) and allows a reduction of up to 42% in CO2 emissions from tile adhesive solutions. INITIATIVES 2025 INDIVIDUAL SHAREHOLDERS: 100TH LETTER TO SHAREHOLDERS AND NEW E-CLUB WEBSITE In 2025, Saint-Gobain’s Individual Shareholders Department celebrates the publication of its 100th Letter to Shareholders, which has been sent to all interested shareholders since 1993! The letter keeps shareholders up-to-date with the Group’s latest news, strategy and developments. 2025 is also an opportunity for the department to present the new, more ergonomic site for the members of Saint-Gobain Shareholders’ Club, in line with the Group’s graphics charter. New tours and conferences will be offered to Club members throughout the year. To subscribe to the Letter to Shareholders and become a member of the Club, go to the e-Club page.

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