A new seller on your listing at a price you cannot match
You own the brand. You are the only authorised seller. Then one morning the sales on your best-selling ASIN halve, and when you look at the offer listing there is a seller you have never heard of, a few pounds cheaper, winning the Buy Box. Sometimes it is a reseller with genuine stock bought from a distributor who was not supposed to supply Amazon. Sometimes it is someone selling counterfeits, or someone with no stock at all who will cancel the orders and leave your listing with the complaints.
You find out from the sales report or, worse, from a one-star review mentioning a fake product. By then the other seller may have been on the listing for days.
Why hijackers go unnoticed
Seller Central does not send you a clear message when another seller joins your listing. The information exists, in the offers on each ASIN and in the Buy Box data, but you have to look for it, and with dozens or hundreds of ASINs nobody checks them all every day.
- Offers on a listing change constantly, and nothing alerts you to a new seller ID.
- Hijackers often appear on smaller ASINs first, where nobody is looking.
- Some come and go within hours, so a weekly check misses them.
- Your own resellers and distributors, if you have any, make it hard to spot who is unauthorised.
- Evidence has to be gathered while the offer is live, not after it disappears.
What each hijack costs
The obvious loss is Buy Box share while the other seller is winning it. The less obvious ones last longer. Customers who receive a counterfeit or a used item as new leave reviews on your listing, not theirs. Complaints about authenticity can put your listing, and sometimes your account, under review. Price-cutting drags down the price customers expect to pay, and your repricer may follow it down if you let it.
There is also the time spent on reporting. A report through Brand Registry without dates, seller IDs, prices and test-buy details gets a slower, less useful response than one with the facts laid out.
The listing watch we build
- A list of your ASINs and your authorised seller IDs, including any distributors you allow, kept in one place.
- Regular checks of the offers on each ASIN through the Selling Partner API, with priority ASINs checked more often.
- An alert by email, Slack or Teams when an unknown seller ID appears, with the ASIN, the seller, their price, their fulfilment method and whether they hold the Buy Box.
- A timeline per incident: when the seller appeared, price changes, Buy Box share and when they left.
- Space in each incident to record a test buy: order number, what arrived, photos, how it differs from your product.
- A report draft built from the incident, ready for your team to check and submit through Brand Registry's Report a Violation tool or the route your account uses.
| Event | What the watch does |
|---|---|
| Authorised seller joins | Logged, no alert |
| Unknown seller joins, no Buy Box | Alert, incident opened |
| Unknown seller wins Buy Box | Priority alert |
| Seller leaves listing | Incident updated, kept for pattern review |
| Same seller returns later | Linked to the earlier incident |
We do not contact other sellers, send warnings or file reports for you. Deciding whether an offer infringes your rights, and what to say about it, is a decision for you and, where needed, your legal adviser.
What the week looks like afterwards
Instead of discovering hijackers from a sales dip, you get an alert within the check interval you set. Your team opens the incident, decides whether to do a test buy, and has the timeline ready if a report is needed. Incidents that turn out to be your own distributor are marked and ignored next time.
Over months, the incident log becomes useful in its own right. You can see which ASINs attract unauthorised sellers, which seller IDs keep coming back and whether a particular distributor's stock seems to be leaking onto Amazon. That is the information you need for conversations about distribution agreements, which no alert on its own gives you.
It also keeps the pricing side calm. If your repricer is set to follow the lowest price, the watch can hold it while an incident is open, so you are not racing a counterfeit seller to the bottom.
Is this happening to your listings?
- You have found other sellers on your listings only after sales dropped.
- Reviews mention fake or used items you never shipped.
- Nobody checks the offers on every ASIN regularly.
- Your Brand Registry reports lack dates, prices and test-buy details.
- The same unauthorised sellers keep coming back.