REGULATED PRESS RELEASE

from SAINT-GOBAIN (EPA:SGO)

Reporting on share buyback transactions carried out between September 21 and September 25, 2026

September 28, 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 21 to September 25, 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)
2026-09-2150,00069.7893,489,435XPAR/CEUX/TQEX/AQEU
2026-09-229,94669.827694,503XPAR/CEUX/TQEX/AQEU
2026-09-2429,80169.9492,084,541XPAR/CEUX/TQEX/AQEU
2026-09-2536,01369.7552,512,083XPAR/CEUX/TQEX/AQEU
Total over the period125,76069.8208,780,563
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