POS: Notice of record date for a ballot

1. Issuer: PTSC Offshore Services Joint Stock Company
2. Stock code: POS
3. Par value: VND10,000/share
4. Record date: 20/10/2025
5. Ex-date: 17/10/2025
6. Reason:
     * For a ballot:
          - Exercise rate: 01 share - 01 voting rights
          - Content of the ballot: Approving the adjustment of the Contract for providing Connection and Test Operation (HUC) services for the Block B - O Mon project (Package No. 1) between PTSC Operation and Construction Joint Stock Company and PTSC Marine Mechanical Services Company Limited
          - Expected exercise date: from 24/10/2025 to 05/11/2025
          - Location: Office of PTSC Offshore Services Joint Stock Company at No. 65A, 30/04 Street, Rach Dua Ward, Ho Chi Minh City