PGN: Change in shareholding of principal shareholder (Huynh Van Quang)

- Name of issuer: Plastic Additives Joint Stock Company
- Stock code: PGN
- Securities type: common stock
- Name of principal shareholder: Huynh Van Quang
- Number of shares held by the principal shareholder before transaction: 2,246,710 shares (23.74%)
- Number of shares acquired: 98,700 shares
- Total holding following transaction and total percentage following transaction: 2,345,410 shares (24.78%)
- Purpose of transaction: Increase shareholding
- Date of transaction: 12/12/2025