All personal information that is collected in the registration process is only kept for administrative purposes. No personal information will ever be given out to a third party.
Any information you select to write on the forum, for example on the user page is open for the world to see so only write what you are comfortable to share. For a company there could be contact information and web site address for example. External links will only be tolerated for web sites that are relevant to precious metal refining to keep down spam.