Becoming a partner in a big 4 firm

السلام عليكم و رحمة الله و بركاته

I wanted to know if becoming a partner in a big 4 firm is halal.I work in audit and in my sector we do not work with any financial services such as banks and insurance companies so most of the clients we work on are halal to work with.

To become a partner you must buy equity in the business.I have the buy in value in cash so alhamduliiah i dont have to take out a loan for that.As the company as a whole works with banks and insurance coampanies and technicallly i would be buying into the company as a whole and not my sector is this investment permissible?

Jazakallah

Wasalam wr wb

May Allah bless you.
I think the best thing to do is to work out if the shares are shariah compliant or not. Please check this link which will guide you towards making the assessment:

Kind regards