BOUYGUES DISCLOSUREShare Buybacks

Bouygues: Disclosure of trading in own shares

BOUYGUES SA A Société Anonyme (public limited company) with a share capital of €385,323,631 Registered office: 32 Avenue Hoche, 75008 Paris, France Registration No. 572 015 246 Paris – I.E. FR 29 572 015 246 REGULATED INFORMATION Disclosure of trading in own shares Disclosure of trading in own shares on 7t, 8, 9, 10 and 11 September 2026. As part of the authorisation granted by the Annual General Meeting of 23 April 2026 I. Summary presentation Name of issuer Identity code of issuer Transaction date Identity code of financial instrument Total daily volume traded (number of shares) Daily weighted average price of shares purchased Market BOUYGUES SA 969500MOCLNQFNZN0D63 07 September 2026 FR0000120503 41,600 44.6885 XPAR BOUYGUES SA 969500MOCLNQFNZN0D63 08 September 2026 FR0000120503 43,000 45.0717 XPAR BOUYGUES SA 969500MOCLNQFNZN0D63 09 September 2026 FR0000120503 64,500 44.511 XPAR BOUYGUES SA 969500MOCLNQFNZN0D63 10 September 2026 FR0000120503 55,000 43.946 XPAR BOUYGUES SA 969500MOCLNQFNZN0D63 11 September 2026 FR0000120503 59,000 44.0467 XPAR II. Detailed presentation https://www.bouygues.com/app/uploads/2026/09/2026-09-14-declaration-agregee-et-detaillee-des-operations-realisees-par-BOUYGUES-sur-ses-propres- titres.xlsx PARIS, 14 SEPTEMBER 2026