REGULATED PRESS RELEASE

from SAINT-GOBAIN (EPA:SGO)

Reporting on share buyback transactions carried out between March 9 and March 13, 2026

March 16, 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 9 to March 13, 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)
2026-03-09316,83772.92123,104,198XPAR/CEUX/TQEX/AQEU
2026-03-10250,00074.96518,741,350XPAR/CEUX/TQEX/AQEU
2026-03-11250,00073.59818,399,400XPAR/CEUX/TQEX/AQEU
2026-03-12250,00072.97518,243,750XPAR/CEUX/TQEX/AQEU
2026-03-13250,00071.71917,929,800XPAR/CEUX/TQEX/AQEU
Total over the period1,316,83773.22096,418,498
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