COMMUNIQUÉ RÉGLEMENTÉ

par SAINT-GOBAIN (EPA:SGO)

Reporting on share buyback transactions carried out on May 18, 2026

May 26, 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, on May 18, 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)
2026-05-1857,18173.4594,200,430XPAR/CEUX
Total over the period57,18173.4594,200,430
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