Finding a seller's profile
Every listing names its seller near the top, with their feedback score and the percentage positive. Click the username and you are on their profile: feedback left for them, with the items it was left on, how long they have been registered, where they are, and a link to their items for sale. If you only have the username, type ebay.com/usr/ followed by the name into the address bar. Feedback is public, so this works for any seller, signed in or not.
Seeing what a seller has for sale
On the profile, Items for sale opens their whole active inventory, with eBay's usual filters on the left: category, condition, price, format. If they run an eBay Store, the store page groups the same items by the seller's own categories, which is often the quickest way to see what they specialise in.
Seeing what a seller has sold
Open Advanced Search (the link beside the search button). Under Sellers, choose Only show items from specific sellers and type the username. Under Search including, tick Sold listings. Leave the keywords empty for everything they have sold, or add a product to narrow it. The result is their sold list for roughly the last 90 days, newest first, with each price. Multi-quantity listings show once with the quantity sold on the listing page, so count those with care.
That is as far as eBay goes. It does not total the list, average it, or tell you how the seller's volume compares with anyone else's. The seller names in Seller Hub's research tool are anonymised, so you cannot start from a product and work out who sells the most of it there.
What you cannot see on eBay
- Total sales or revenue for a seller over any period.
- Their share of a product's sales against other sellers.
- Their average sold price for a product, or how it compares with the market's.
- Best Offer amounts they accepted; the list shows the asking price.
- Anything older than about 90 days.
From one seller to the top sellers for a product
The more useful question is usually the reverse: for the product I am about to list, who are the sellers I am up against? Terapeak answered it with Seller Research, by name. eBay's Product Research hides the names.
SoldPeak's competitor research answers it inside any search. Run a product, and the top sellers are listed by username with their share of sales, the number sold, their average price, their revenue, their feedback score and, where a listing page was read, their lifetime sales on that listing and the Best Offer amounts they accepted. The seller filter then narrows the same search to one username, so you can see exactly what a competitor sold of that product, at what prices, over the window you choose, back to July 2026 on Professional. There is one honest limit: SoldPeak researches products and categories, not sellers on their own, so the seller filter works inside a search rather than listing a seller's entire catalogue.
Competitor research is on the Professional plan. Every plan shows what a product sells for; try a live search, or read how to read eBay sold listings first.