It shall be prohibited to execute any purchase order issued by any client whose ownership alone or his ownership together with that of his minor children, or the accounts standing under his disposal amounts to 5% or more of any listed Security, and who wishes to carry out any transaction whether for his own account or any account standing under his disposal in a number of Securities representing 1% or more of such issue, unless such transaction is concluded on a licensed exchange in Bahrain and the CBB's prior written consent is obtained.