ANSWER:

When a person invests in a company, he is a partner in it.

Therefore, if they deposit money in a bank and take interests or finance their projects by borrowing from interest based banks, this is not permissible and one must not invest in such companies. 

QUESTION: Is it permissible to invest in a company, wich deals with interest, even though the main source of income is halal ?I don’t mean by dealing with interest, that they have a business like a bank. But today almost every company has to deal with some form of interest

Halal/Haram Matters, Riba | December 20, 2022 1:33 am
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QUESTION: I’m a student of Bachelors in Islamic Studies and about 4 days ago my teacher said during lecture that those who will abstain from music, Allah and our prophet ﷺ and other prophets would recite Quran for them and later searched and sent her a link from islamqa.info but she didn’t replied and today in class she said we can say this because we have to call them to right path.
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QUESTION: I’m being invited to a mehndi function where there is going to be segregation between men and women. There is going to be no music in the men’s section. However, music will be played in the women’s section. Me being a male, if I go to such a function will I be sinful? Considering there is going to be no music in my section