CSI: Change in shareholding of principal shareholder (Kirin Capital Investment and Development Joint Stock Company)

- Name of issuer: Vietnam Construction Securities Joint Stock Company
- Stock code: CSI
- Securities type: common stock
- Name of principal shareholder: Kirin Capital Investment and Development Joint Stock Company
- Number of shares held by the principal shareholder before transaction: 1,724,200 shares (10.26%)
- Number of shares acquired: 1,500,000 shares
- Total holding following transaction and total percentage following transaction: 3,224,200 shares (19.19%)
- Purpose of transaction: Increase shareholding
- Date of transaction: 18/09/2025