If you need to view companies by industry on a regular basis I would suggest creating a saved view so you can quickly see the information, and / or create an Active list if you'd like to use the information for emails, workflows and reporting. If 'banking' is too broad an industry you could always create a 'sub-sector' property and add specfic values.
Both contacts and companies have 'Industries' so it might also be worth creating a workflow to copy an inustry to a contact to make sure they're consistent. I often see differences or gaps in data due to industry info 🙂