All listed companies' securities held on behalf of the employees under an employee stock option plan or employee share benefit plan, must be held in trust by a trustee subject to the prior written approval of the CBB. The securities account opened and maintained at a licensed central depository for this purpose must be clearly identified as a trust account for the employee stock option plan or employee share benefit plan accordingly. Where employees are eligible to trade in the securities of the issuer held on their behalf in an employee stock option plan, the directors, executive management and any other key persons must not be eligible to hold the position of trustee of such plan.