LETTER TO SHAREHOLDERS No. 100

8 LETTER TO SHAREHOLDERS No. 100 SHAREHOLDER’S NOTEBOOK SHAREHOLDER’S NOTEBOOK Recent performance at 03/05/2025 (%) Saint-Gobain share CAC 40 Performance since 01/01/2021 +168.1% +47.2% Performance since 01/01/2024 +50.8% +8.4% — (1) Saint-Gobain share — CAC 40 TOTAL NUMBER OF SHARES (at December 31, 2024) ~496.9 million OWNERSHIP STRUCTURE (at December 31, 2024 – %, estimated) SAINT-GOBAIN SHARE PERFORMANCE 01/01/2021 TO 03/05/2025 SIGN UP FOR THE E-LETTER TO SHAREHOLDERS To receive your copy of the Letter to Shareholders and keep abreast of all the latest Saint-Gobain news, sign up for the e-Letter to Shareholders, in the Shareholders section of www.saint-gobain.com or send an e-mail to actionnaires@saint-gobain.com. YOUR CONTACTS Saint-Gobain’s Shareholder Relations Department will be pleased to answer any enquiries. Please feel free to contact them: • By dialing: (from France) 0 800 32 33 33 or +33 1 88 54 05 05 (from outside France) • Online, at: www.saint-gobain.com • By e-mail, at: actionnaires@saint-gobain.com Managing Editor: Vivien Dardel Manager, Individual Shareholders: Blandine Ruesch ISSN No. 1245-3978 Design: Cédric Bertandeau Photo credits: Saint-Gobain photo library • Via the Saint-Gobain Shareholder App • By post: Saint-Gobain Service Actionnaires Tour Saint-Gobain 12 place de l’Iris 92096 La Défense Cedex France 8.0% Group Savings Plan (employee shareholders) 33.4% Institutional investors: Americas-Asia 16.4% Institutional investors: France 9.4% Private shareholders 32.5% Institutional investors: Other Europe 0.3% Treasury shares DATES FOR YOUR DIARY FINANCIAL AGENDA First-quarter 2025 sales: April 24, 2025 after market closing Annual General Meeting (AGM): June 5, 2025, 3:00 p.m. Salle Pleyel, 75008 Paris First-half 2025 results: July 31, 2025 after market closing First-nine months 2025 sales: October 30, 2025 after market closing DOCUMENTATION (ONLINE) Sustainable Construction magazine High: €100.55(1) 03/05/2025

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