GTT : Statement of own shares dealings from on June 26th 2026

GAZTRANSPORT ET TECHNIGAZSociété anonyme with a share capital of €371,177.72Registered office:1 route de Versailles – 78470 Saint-Rémy-lès-Chevreuse, France662 001 403 R.C.S. VersaillesNote: details of transactions are attached.Investor relations contact:information-financiere@gtt.fr / +33 (0)1 30…

GAZTRANSPORT ET TECHNIGAZ

Société anonyme with a share capital of €371,177.72

Registered office:1 route de Versailles – 78470 Saint-Rémy-lès-Chevreuse, France

662 001 403 R.C.S. Versailles

Statement of own shares dealings on June 26th 2026

Issuer’s nameIssuer’s identifying codeDate of transactionIdentifying code of financial instrumentAggregated daily volume (in number of shares)Daily weighted average price of the purchased sharesMarket (MIC code)

GTT SA969500BVOHVZUUFWDT5426/06/2026FR001172683521,420181.16 €XPAR

GTT SA969500BVOHVZUUFWDT5426/06/2026FR00117268355,150180.40 €XPAR

TOTAL26,570181.02 €

Note: details of transactions are attached.

Investor relations contact:

/ +33 (0)1 30 23 20 87 / +33 (0)1 30 23 42 64

Attachment