COMPAGNIE DE SAINT-GOBAIN DISCLOSUREShare Buybacks

Reporting on share buyback transactions carried out between 2 and 3 September, 2026

Transaction date Total daily volume (number of shares bought back) Daily weighted average purchase price Amount (in euros) Market (MIC Code) 2026-09-02 31,841 74.978 2,387,365 XPAR/CEUX/TQEX/AQEU 2026-09-03 28,970 74.869 2,168,961 XPAR/CEUX/TQEX/AQEU Total over the period 60,811 74.926 4,556,326 Issuer: Compagnie de Saint-Gobain Security type: SHARES - ISIN Code : FR0000125007 September 7, 2026 Reporting on share buyback transactions carried out in accordance with Article 5 §2 of Regulation (EU) No 596/2014 of April 16, 2014 on market abuse Share buyback program authorized by the Annual General Meeting of June 4, 2026 (10th resolution) In accordance with applicable regulations, Compagnie de Saint-Gobain announces having carried out the following share buyback transactions in accordance with Article 5 §2 of Regulation (EU) No 596/2014 from September 2 to September 3, 2026 1 sur 1