How is the Buy Box winner determined?

Amazon's algorithm considers: price (including shipping), fulfillment method (FBA preferred), seller metrics (order defect rate, shipping speed), account health, and inventory availability.

How do I protect Buy Box from unauthorized sellers?

Enroll in Brand Registry, use MAP (minimum advertised price) policies, monitor listings with tools like Helium 10 or Jungle Scout, and file IP complaints against counterfeiters or policy violators.

Marketplace & Channel Terms

Buy Box

The main 'Add to Cart' button when multiple sellers offer the same product.

1 min readLast updated Apr 2026

Quick Reference

CategoryMarketplace & Channel Terms

Related Terms1

The main 'Add to Cart' button when multiple sellers offer the same product.

Why It Matters

82% of Amazon sales go through the Buy Box. Without it, your listing appears as a secondary 'Other Sellers' option with tiny click-through.

Practical Example

Scenario

A housewares brand competes for Buy Box on their products resold by other sellers.

Calculation

At 60% Buy Box share: 600 sales/month. Increasing to 85%: 850 sales/month

Result

42% increase in sales from Buy Box optimization without any advertising spend increase

Pro Tips

1Price competitively—Buy Box algorithm heavily weights price (including shipping)
2Maintain 95%+ seller metrics: order defect rate, late shipment rate, cancellation rate
3Use Amazon Brand Registry and enroll in programs that favor brand owners for their ASINs

Common Mistakes to Avoid

Racing to the bottom on price—this destroys margins; focus on metrics and FBA too

Ignoring Buy Box share reporting—track it weekly and investigate drops

Having stockouts—inventory availability is a Buy Box factor

Frequently Asked Questions

Related Terms

Amazon Seller Central

The platform where third-party sellers manage their Amazon business.