There seems to be no way to download the company name of registrant to events. This is really needed, to know where are guest are coming from and to be able to add the company name when printing name badges.
I apologize you are unable to export a copy of this information from your event registrants! I understand how important it is to access these details as easily as possible and would like to take a further look for you. What exactly happens when you attempt to download this custom report (error message, blank section)? Also, what is the event campaign you are having this experience with? These are important details to have as both active events in your account do not ask for the company name of a registrant. Your most recently closed campaign also does not have company names attached to its registrants as well. Unless your registration form includes a section to fill out a company name, these company names will not show in a report of your registrants.