BIG: Change in shareholding of principal shareholder (Pham Thi Quynh Tram)

- Name of issuer: Big Invest Group Joint Stock Company
- Stock code: BIG
- Securities type: common stock
- Name of principal shareholder: Pham Thi Quynh Tram
- Number of shares held by the principal shareholder before transaction: 2,445,429 shares (15.29%)
- Number of shares disposed: 139,100 shares
- Total holding following transaction and total percentage following transaction: 2,306,329 shares (14.42%)
- Purpose of transaction: Sell ​​shares
- Date of transaction: 19/08/2025.