When you add listings to your Company Listings tab you have the option to mark a listing as private by checking the Keep This Listing Private checkbox at the bottom of the listing:
Marking a listing as private will do several things:
-Listing will not be syndicated
-Listing will not be included in company email blasts
-Listing will not appear on company website if using Nestio API or widget
-Listing will not be shared with the Nestio broker community (if applicable via company settings)
In short, marking a listing as private will make the listing visible only to agents within your company.