Hong Dat Industry Co.,Ltd is no longer a principal shareholder of Drilling Mud Corporation with information as follows:

- Name of principal shareholder: Hong Dat Industry Co.,Ltd

- Name of stock held: PVC

- Number of shares held by trading institution before transaction: 2,599,430 shares (5.2% of charter capital)

- Number of shares disposed: 299,400 shares

- Total holding following transaction and total percentage following transaction: 2,300,030 shares (4.6% of charter capital)

- Date of transaction: 10/07/2015