Dear Shareholders,

PetroVietnam Technical Services Corporation respectfully sends to Valued Shareholders and interested Investors Official Letter No. 1637/PTSC-BTK dated October 06, 2026 regarding disclosure of information on the Resolution approving the charter capital increase, amendment to the charter, changes to enterprise registration contents in the enterprise registration certificate, additional securities registration and additional listing registration, as detailed in the attached document.

Sincerely./.

Attachment:
1637/PTSC-BTK