Is investing in the stock of a company whose activities are partly permissible and partly impermissible (such as brokerage in halal stocks, banks, consultations, and research, alongside brokerage in haram stocks) considered halal or haram?

It is impermissible to invest money in companies where some of their activities are permissible (halal) and others are forbidden (haram). This is based on the ruling issued by the Islamic Fiqh Academy, affiliated with the Organization of Islamic Cooperation, which states that the general principle is "the impermissibility of participating in companies that sometimes deal with forbidden matters, such as usury and the like, even if their primary activities are permissible." This is also supported by the ruling from the Islamic Fiqh Council, affiliated with the Muslim World League, which states: "It is not permissible for a Muslim to purchase shares in companies and banks if some of their dealings involve usury and the purchaser is aware of that."