PSN: Notice of record date for a ballot

1. Issuer: PTSC Thanh Hoa Technical Services Company
2. Stock code: PSN
3. Par value: VND10,000/share
4. Record date: 05/06/2025
5. Ex-date: 04/06/2025
6. Reason:
     * For a ballot:
          - Exercise rate: 01 share - 01 voting rights
          - Content of the ballot: human resources under authority of the Company's General Meeting of Shareholders.
          - Expected exercise date: on 09/06/2025
          - Implementation location: Company's head office (No. 268 Tran Nhat Duat, Truc Lam ward, Nghi Son town, Thanh Hoa province)