Open reports
Open Reports. The page says it reviews sales, payouts, and performance by vendor.
Filters
Under Filters, use Filter by Status, Filter by Vendor, From, and To. Click Submit.
Each row shows Vendor, Total Products Sold, Gross Sales, and Vendor Payout. On stores that are not using payout statements, a Current Balance column can also appear.
Open one vendor
Click the number under Total Products Sold. The heading is Reports / the vendor name. Tabs are By product and By SKU. The product table has Product Title, Total Sold, Gross Sales, and Vendor Payout.
Click the number under Total Sold to open the matching orders on the Orders page.
Export
At the bottom of Reports, click Export to CSV or Export to PayPal Mass Payments. The vendor page has Export to CSV as well.