Dear Shareholders,

PetroVietnam Technical Services Corporation respectfully sends to Valued Shareholders and interested Investors Official Letter No. 1310/PTSC-BTK dated August 10, 2026 regarding Disclosure of information on the Resolution regarding the Implementation of the plan to increase charter Capital through the issuance of shares to pay the 2025 dividend; the Correction Notice, including the following documents.

1. Resolution No. 535/NQ-PTSC-HDQT dated August 10, 2026 of the Board of Directors regarding the Implementation of the Plan to increase charter Capital through the issuance of shares to pay the 2025 dividend pursuant to the Resolution of the 2026 Annual General Meeting of shareholders.
2. Notice No. 1308/TB-PTSC-HDQT dated August 10, 2026 of the Board of Directors regarding the Correction of certain contents of the Appendix to the Plan to increase charter Capital through the issuance of shares to pay the 2025 dividend attached to Proposal No. 1007/TTr-PTSC-HDQT dated June 18, 2026.
, as detailed in the attached document.

Sincerely./.

Attachment:
1310/PTSC-BTK