You can make a template file for your profile content type, probably called something like node_profile.tpl.
At the top of this file, write some code that will get the user object of the node owner, and check this against user's roles in $user->roles.
It's easier if you do this with the roleID numbers (you can see these by going to user>role and hovering your mouse over the various links for the roles - the roleID appears as a number somewhere in the link).
Your code in the template then may look something like this. You'll need to know php to understand how it executes.
$userRoles = $GLOBALS['user']->roles;
$account = user_load($node->nid);
if(!empty($userRoles[2])) {
// user is a company user
if(!empty($account->roles[2])) {
// profile belongs to a company user
print 'Company users are only allowed to see business user profiles';
return; // this will stop execution of the template file, and return to the page template
} elseif(!empty($account->roles[1])) {
// profile belongs to a business user
// do nothing - just continue code execution of this template
}
}
For your listings of users, you'll want to make three different views, with views filters in each to determine which users you want displayed. For this, you can create a page which chooses the name of the view based on the user's role(s) - either a "page" with the php code in the body (if you have php code as one of your input types), or else a page you create with a small custom module using hook_menu().
