What is the ruling on an investment portfolio that buys and sells shares in Islamic companies, grants profits every six months, and deducts 2% upon early withdrawal? And is it obligatory to investigate further into its field of work?

Participation in investment funds requires several conditions to be met: the profit must be a common share, not a fixed amount; the capital must not be guaranteed; the company's activities must be permissible; it must not deposit its money in interest-based banks; and the capital must not bear more than the actual expenses necessary for the Mudarabah (profit-sharing partnership). If these conditions are not met, participation in them is not permissible.