How to Identify Companies Without Any Employee Results in Your Tables

Hey, sorry if this has been asked before. I have done a search in Slack and can't find any answers. I have a lot of companies in various tables that I have enriched to find the people that work at those companies. What I would like to do, is get a list of all the companies that did not return any results. tables I have:

Also, anything I can do about companies that have not returned a result?