Information Disclosure of the Audited Separate financial statements for the fiscal year 2025

03/19/2026

Dear Shareholders,

PetroVietnam Technical Services Corporation (PTSC) respectfully sends to Shareholders and interested Investors, Letter No. 363/PTSC-BTK dated March 19, 2026 regarding information disclosure of the Audited Separate financial statements for the fiscal year 2025, as attached.

Best regards./.