Amazon Commingling ends March 31: what resellers without Brand Registry need to do now
The old stickerless/commingled inventory model closes March 31. Resellers using manufacturer barcodes must switch to FNSKU or get shipments rejected. Brand Registry holders actually get the easier path.
By WAYAMZ Team
On March 31, Amazon officially ends stickerless commingled inventory. Resellers without Brand Registry who are still shipping in on manufacturer barcodes will start seeing rejections the week after.
Most of our reseller clients had to be told twice this month. Writing it down in one place.
What “commingling” meant
If your ASIN matched another seller’s, Amazon would pool the inventory at the warehouse and ship from whichever unit was closest to the buyer — no matter whose unit it technically was. That’s commingling (Stickerless, Commingled Inventory).
It made fulfillment faster. It also made counterfeit and defect mixing a chronic problem. Policy-wise, Amazon has been walking this back for a while. March 31 is the hard stop.
Who’s affected
Hardest hit: resellers without Brand Registry. If your product carries a manufacturer barcode (UPC/EAN printed by the factory) and you’re not brand-registered, you’ve been able to ship straight to FBA with the factory barcode. After March 31 that path closes — every unit has to carry an Amazon FNSKU label, or the shipment gets refused at the FC.
Quietly better off: Brand Registry holders. Brand-registered sellers whose products carry manufacturer barcodes get exempted from the Amazon-label requirement. Inbound stays simple.
If you’ve been on the fence about Brand Registry, this is one more reason to finish it.
Three things to do this week
1. Audit your barcode type per SKU. Seller Central → Inventory → Manage FBA Inventory. For each SKU, check whether the barcode type is set to Manufacturer barcode or Amazon barcode. Most pre-2026 reseller accounts will still show Manufacturer barcode.
2. Switch every non-brand-registered SKU to Amazon barcode. In the SKU edit screen, change barcode type to Amazon barcode (FNSKU). Then generate FNSKU labels from the shipment creation flow.
3. Update your 3PL or prep-center workflow. If you use a US 3PL (or are doing your own prep), send them the updated FNSKU labels. Anything shipping out after March 31 without the FNSKU sticker will bounce at the FC receive dock.
Existing inventory already at FBA that was received under the old rules can still sell through. It’s the new inbound that has to be compliant.
The read
This is not another advisory. It’s a dated policy with a receive-dock consequence. If you’re a reseller still running on manufacturer barcodes, March 31 is the day your supply chain needs to have switched — not the day you start thinking about it.