How is the annual Zakat calculated for an investment portfolio whose value fluctuates daily, and what is the ruling on Zakat for the pure shares in this portfolio, knowing that the companies pay Zakat from their profits?

Shares in an investment portfolio are subject to zakat by appraising them and the profits generated from them each year. This is calculated on the day the hawl (one lunar year) passes on the nisab (minimum threshold). All shares are then appraised and their zakat is paid. As for interest-bearing shares, the interest portion must be disposed of, and then the principal capital is subject to zakat. It is permissible for the company's zakat committee to pay the zakat on shares and their profits if this covers both the capital and the profits; otherwise, it is not sufficient.