FBM (Fulfilled by Merchant), which Amazon also calls the Merchant Fulfilled Network (MFN), means you fulfill Amazon orders yourself from your own warehouse or through a third-party logistics provider. You set the handling time and shipping options, pay your own carriers, and handle customer service and returns under Amazon's policies. FBM offers do not carry the Prime badge unless the seller is admitted to Seller Fulfilled Prime, which requires meeting Amazon's delivery-speed and performance standards from your own operation.

Why it matters

FBM is the right choice for some products and a useful backup for many. Large, heavy or slow-moving items can cost more in FBA storage and fulfillment fees than they would to ship directly. Products with strict handling needs, customized items and very high-value goods are often better kept in the seller's control. And a merchant-fulfilled offer alongside an FBA offer on the same ASIN keeps the listing live and selling when FBA stock runs out or is stuck in inbound, which protects rank through the gap.

The cost is conversion. Without the Prime badge and the two-day promise, most FBM offers convert noticeably below an equivalent FBA offer and are disadvantaged in the Buy Box, so they usually need a lower price to win sales.

What moves it

  • Handling time and shipping templates, which set the delivery date shown to shoppers.
  • Performance metrics. Late shipment rate, valid tracking rate and on-time delivery are measured and enforced.
  • Seller Fulfilled Prime eligibility, which restores the Prime badge if the operation can meet the bar.
  • Shipping cost per unit, which decides whether FBM beats FBA on margin for a given size tier.

How we use it

We treat FBM as a tool, not a philosophy. In stock-out risk periods we recommend a merchant-fulfilled SKU on key ASINs so the listing never goes dark. For oversize products we compare the two channels on landed cost per unit before recommending a switch. Advertising on FBM offers is set with their lower conversion rate in mind, so the bids match what the offer can actually earn.