PVS: Notice of transactions of principal shareholders

1. Name of principal shareholder: PetroVietnam Finance Corporation (PVFC)

2. Name of stock held: PVS

3. Securities type: Common stock

4. Number of shares held by principal shareholders: 10,665,222 shares (10.9% of Petroleum Technical Services Corporation’s charter capital)

5. Number of shares to be disposed: 500,000 shares

6. Total holding after transaction: 10,165,222 shares

7. Representative: Mr. Tong Quoc Truong – General Manager of PVFC – cum – Director of Petroleum Technical Services Corporation

8. Purpose of transaction: performing the selling authorization for the trustor.

9. Date of transaction: From 03/09/2008 to 03/10/2008.

HaSTC

>   PVD: Record date for an extraordinary shareholders’ meeting (05/09/2008)

>   MCV: Insider trading (Hua Thanh Binh) (05/09/2008)

>   ST8: Insider trading (Pham Hong Thuy) (05/09/2008)

>   ST8: Insider trading (Do Quoc Lam) (05/09/2008)

>   VTO: Trading of affiliated person (05/09/2008)

>   MCV: Trading Result (Tran Van Luu) (05/09/2008)

>   DCL: Approval for listing stock (05/09/2008)

>   KHP: Trading of institution (05/09/2008)

>   DDM: Dividend Payment in Cash (05/09/2008)

>   MCV: Insider trading (Le Sy Tien) (05/09/2008)