What is the ruling on contributing to the purchase of shares in a company under establishment, when it is not known whether its transactions will be clean or not?

Shares of companies are divided into two types: shares in permissible companies (such as manufacturing and construction), and it is permissible to invest in them provided they are free from usury. The second type is shares in impermissible companies (such as usurious banks and commercial insurance companies), and it is not permissible to invest in them. Due to the prevalence of the forbidden, whoever wishes to invest in a company must ascertain its activity, sources of funding, and investments, and consult with scholars regarding the ruling on participating in it.