TST: Mr. Dong registered to buy 3,000 shares

Telecommunication Technical Service JSC (HNX: TST) to announce its Director transaction notice as follows:

1. Name of issuer: Telecommunication Technical Service JSC

2. Stock code: TST

3. Name of person discharging managerial responsibility/Director: Nguyen Duc Dong

4. Position: Chair of the Board cum General Manager

5. Securities type: Common stock

6. Number of shares held by the shareholder: 28,600 shares (0.596% of charter capital)

7. Nature of transaction: Acquisition through continuous order matching

8. Number of shares to be acquired: 3,000 shares

9. Purpose of transaction: Investing

10. Expected date of transaction: From 09/08/2011 to 05/09/2011.

HNX

>   PDC: Notice of transaction of connected institution (06/08/2011)

>   ONE: Mr. Hung acquried 87,400 shares (06/08/2011)

>   PV2: Results of share repurchase for Treasury stock (06/08/2011)

>   PVS: Board Resolution on share transfer (06/08/2011)

>   DLG: Ms. Huong disposed 2,000,000 shares (04/08/2011)

>   LDP: Nguyen Kim Investment and Development JSC registered to dispose 309,800 shares (04/08/2011)

>   DLG: Ms. Huong disposed 2,000,000 shares (04/08/2011)

>   DXG: Mr. Tu’s transaction results (04/08/2011)

>   HQC: Ms. Huong bought 268,080 shares (04/08/2011)

>   HQC: Mr. Le Dinh Vien bought 286,500 shares (04/08/2011)