Disclosure of Information: Registration of the additional trading date for CTB shares on 16 Dec 2025

Hai Duong Pump Manufacturing Joint Stock Company respectfully announces that:

On 3 December 2025, HAPUMA submitted to the Hanoi Stock Exchange (HNX) the Registration for additional trading date for 6,839,960 newly issued CTB shares arising from the capital increase from owners’ equity.

• Effective date of amended listing: 2 December 2025
• Additional trading date: 16 December 2025

Respectfully.