finding the emails of investment bankers form big companies through LinkedIn in an excel file

I am looking for assistance in finding the emails of investment bankers from big companies through LinkedIn. The industry I am targeting is finance. I am not sure whether I need specific information from the LinkedIn profiles other than the emails; however, I need to find more than 300 contacts. I anticipate the project will require time and research skills to complete. If you are able to do this work, I would love to hear from you. Thank you for your time and consideration!