FBM (Fulfilled by Merchant) means the Amazon seller handles storage, packing, and shipping for every order instead of sending inventory to Amazon's fulfillment centers.
FBM vs. FBA
| Dimension | FBM | FBA |
|---|---|---|
| Warehousing | Your warehouse or 3PL | Amazon FC |
| Shipping | You or your carrier | Amazon |
| Prime eligibility | Via Seller Fulfilled Prime only | Automatic |
| Monthly storage fee | None (Amazon-side) | Yes |
| Flexibility | High — full control | Lower |
When FBM Makes Sense
- Oversized or heavy items where FBA fees would erode margin
- Low-velocity SKUs that would incur long-term storage fees
- Hazmat or restricted products Amazon won't accept in FCs
- Custom / personalized items that need direct handling
- Sellers testing a new product before committing to FBA inventory
Seller Fulfilled Prime (SFP)
FBM sellers can apply for Seller Fulfilled Prime, which lets them display the Prime badge while shipping from their own warehouse. Requirements include a 99%+ on-time delivery rate, same-day processing cutoff, and use of Amazon's Buy Shipping for eligible orders. SFP gives the best of both worlds — Prime badge without FBA fees — but the operational bar is high.
FBM and the Buy Box
Amazon's algorithm favors FBA listings for the Buy Box because Amazon controls the fulfillment experience. FBM sellers can still win the Buy Box, but they need competitive pricing, strong seller metrics (order defect rate under 1%, late shipment rate under 4%), and fast handling time.