BTD: Change in shareholding of principal shareholder (Nguyen Duy Hung)

- Name of issuer: Thuduc Centrifugal Concrete Joint Stock Company
- Stock code: BTD
- Securities type: common stock
- Name of principal shareholder: Nguyen Duy Hung
- Number of shares held by the principal shareholder before transaction: 635,110 shares (9.9%)
- Number of shares acquired: 14,500 shares
- Total holding following transaction and total percentage following transaction: 649,610 shares (10.13%)
- Purpose of transaction: investment
- Date of transaction: 16/01/2026