COMMUNIQUÉ RÉGLEMENTÉ

par SAINT-GOBAIN (EPA:SGO)

Reporting on share buyback transactions carried out between March 23 and March 27, 2026

March 30, 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 5, 2025 (16th 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 March 23 to March 27, 2026

Issuer: Compagnie de Saint-Gobain

Security type: SHARES - ISIN Code : FR0000125007

Transaction dateTotal daily volume (number of shares bought back)Daily weighted average purchase priceAmount (in euros)Market (MIC Code)
2026-03-23200,00067.76613,553,240XPAR/CEUX/TQEX/AQEU
2026-03-24200,00070.28414,056,800XPAR/CEUX/TQEX/AQEU
2026-03-26153,60070.72310,862,976XPAR/CEUX/TQEX/AQEU
2026-03-27200,00068.94413,788,740XPAR/CEUX/TQEX/AQEU
Total over the period753,60069.34952,261,756
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