RCC: Result of transaction of principal shareholder (Nguyen Duc Giang)

- Name of issuer: Railway Construction Corporation Joint Stock Company
- Stock code: RCC
- Securities type: common stock
- Name of principal shareholder: Nguyen Duc Giang
- Number of shares held by the principal shareholder before transaction: 3,504,568 shares (10.93%)
- Number of shares acquired: 545,510 shares
- Total holding following transaction and total percentage following transaction: 4,050,078 shares (12.63%)
- Date of transaction: 09/09/2025