Actually, you can view sales by any partner that you are distributing with!
On the left side of the navigation page in My Account, click on Trending Reports
Under Partner, you should see a list. You can check or uncheck each partner to view sales from a certain time period.
You can also view sales by author, should you have multiple authors.
Please note: Sales may not yet have been reported to us from the partner site, so these sales may not equal the payments received at any given time.
Partners do not report who purchased the books, either.