You can share reports with anyone via a link.
To generate a share link:
- From the navigation toolbar, choose Reports and select Sent Campaigns.
 - Click the campaign for which you want to see reports.
 - Click More and select Share Reports from the dropdown menu. 
 - Select header details from the dropdown and enter the access code
 - Click Generate Report Link.
 - The report URL will be generated below. Copy-paste it in another tab to view it. 
 - You need to share this password with the people you want to share the reports with.