What is the ruling on working as a financial analyst in major companies in terms of permissibility, prohibition, or dubiousness?

There is no objection to performing financial analysis for companies if their activities are permissible. However, if their activities are forbidden, it is not permissible to do so, based on the Almighty's saying: "And do not cooperate in sin and aggression." Financial analysis is important for helping management in setting goals, correcting deviations, discovering investment opportunities, and determining borrowing capacity. So, if a company's work is impermissible or it engages in forbidden activities, it is not permissible to work for it or assist it.