No, actually he can't anonymize that data. High variation might as well be a signature for a short list (under 1000) of companies.

Also, his company has spent time and money to gain access to data that should help him pick emerging companies. I'm not sure why you would feel entitled to that. I'm sure they are working on some data project to help automate decisions on applicants, if not they will be eventually.

That data will give them an edge when making offers. When you are in a position where asymmetrical information is working to your advantage why would anyone give that up?