Is investing in Sharia-compliant investment funds that deal with Saudi stocks permissible or forbidden, especially if done through interest-based banks?

There is no objection to contributing to stock funds in which Islamic banks speculate, provided they adhere to the following Sharia-compliant conditions: that the profit ratio is shared between the two parties, that the capital is not guaranteed, that the company's activities are permissible, and that it does not deposit its money in interest-based banks. However, if interest-based banks are the ones speculating, then one should refer to specialized fatwas regarding the ruling on participating in them.