A9 Algorithm
The A9 algorithm is Amazon’s product search ranking system, named after the retail subsidiary that built it. It decides which listings appear — and in what order — when a shopper types a query into the Amazon search bar.
How the A9 Algorithm Ranks Products
- Amazon matches the query to indexed keywords across your listing.
- It scores relevance based on title, bullets, description, and backend terms.
- It weighs performance signals: click-through rate, conversion rate, and sales velocity.
- It factors in price competitiveness, availability, and Prime eligibility.
- Results reorder continuously as new session data arrives.
Ranking Factors A9 Prioritizes
| Factor | Why It Matters |
|---|---|
| Keyword relevance | Matches shopper intent to indexed listing terms |
| Conversion rate | Amazon rewards listings that turn clicks into sales |
| Sales velocity | Fast sellers rank higher for competitive terms |
| Price | Competitively priced listings earn more visibility |
| Reviews and rating | Higher star ratings signal buyer trust |
| Fulfillment method | FBA and Prime-eligible listings often surface first |
| Image and copy quality | Better assets lift CTR, which lifts rank |
How SellerSonar Helps
- The Keyword Rank Tracker shows where you rank across every A9-targeted term.
- Ranking Alerts fire when a listing drops on a key keyword.
- The Listing Quality Checker audits the on-page factors A9 weighs most.
Start a free 14-day trial and see your A9 ranking picture in under 5 minutes.