Check out my reply in this thread: Direct links to products or websites - #4 by Flawless
If you have a list of companies, you can create a URL parameter and tie that to the user.
like you could have something like “yourwebsite.com/?company=company-name” that would direct them to a signup form where that company is the default selected. It would be the “Current Company” on the screen.
You would only need 2 screens for this. A loading screen set as the “login” screen so that the users land there first, and then the actual login screen with the form.
The loading screen would contain a countdown timer within a list of companies that match the input that you update with the javascript component.