What Changed from A9 to A10?
Amazon's A9 algorithm (used until roughly 2019 to 2020) was heavily weighted toward direct keyword-to-sales velocity: the more you sold for a keyword, the higher you ranked for it. Advertising spend was the dominant lever - brands could essentially "buy" rankings by spending heavily on Sponsored Products.
A10 shifted the equation. Amazon's data showed that products with authentic organic demand signals - external traffic, strong seller authority, high organic click-through rates - outperformed competitors in the long run. The algorithm now actively rewards these signals, making PPC alone an insufficient strategy for sustainable ranking.
Amazon hasn't officially named or confirmed "A10" - it's the name the seller community uses to describe the updated algorithm behaviour observed from 2020 onwards. The actual mechanism is a proprietary machine learning system that weighs hundreds of factors.
The Top Ranking Factors in 2025
Sales Velocity Highest Impact
How many units you're selling per day relative to competitors in your sub-category. Amazon interprets high velocity as product-market fit. This is still the single most important ranking signal - which is why launch campaigns focus on driving rapid initial sales.
Click-Through Rate (CTR) Highest Impact
The percentage of shoppers who see your product in search results and click it. Amazon A10 places heavy weight on organic CTR specifically (not paid). Your main image, title, price, and star rating all influence CTR. A low CTR tells Amazon your listing isn't relevant or compelling for that keyword.
Conversion Rate (CVR) Highest Impact
The percentage of visitors who buy after clicking your listing. Amazon prioritises products that convert well because they generate more revenue per page view. Average Amazon CVR is 10 to 15% - if you're below 8%, your listing needs significant optimisation before ranking will improve.
External Traffic Highly Weighted in A10
This is the biggest change in A10. Traffic from outside Amazon - Google, Meta, TikTok, email, influencers - is now weighted significantly in ranking calculations. Amazon sees this as a signal that your brand has genuine demand beyond the platform. Even small external traffic campaigns can meaningfully boost organic rank.
Reviews & Ratings High Impact
Not just the count - the recency and quality of reviews matter. A product with 50 reviews averaging 4.6 stars in the last 3 months often outranks one with 500 older reviews at the same rating. Amazon's algorithm detects review velocity (how quickly new reviews are coming in) as a freshness signal.
Seller Authority Medium-High Impact
A new A10 signal not present in A9. Amazon now considers your seller account health metrics: account age, feedback score, order defect rate, policy compliance history, and fulfilment method (FBA ranks significantly higher than FBM for competitive keywords).
Listing Keyword Relevance Medium Impact
Amazon still needs to understand what your product is. Title, bullet points, backend search terms, and subject matter fields need to contain your target keywords in a natural way. Keyword stuffing no longer works and can actually hurt rankings - Amazon's NLP has improved significantly.
Price Competitiveness Medium Impact
Being within 15 to 20% of the category average price for similar products. Extreme outliers (too expensive or suspiciously cheap) are ranked lower, as Amazon's algorithm anticipates poor conversion or customer experience.
What No Longer Works (or Matters Less)
- Keyword stuffing - Cramming every possible keyword into titles and bullets. Amazon's NLP now understands semantic relevance, making this counterproductive.
- Pure PPC spend as a ranking lever - Sponsored Products sales still contribute to velocity, but the direct "PPC â organic rank" correlation is weaker in A10. Organic sales carry more ranking weight.
- Review gating and black-hat tactics - Amazon's detection systems have improved enormously. Any unnatural review patterns trigger suppression.
- Backend keyword abuse - Adding competitor brand names or irrelevant high-volume terms. Amazon's algorithm now ignores or penalises backend terms that don't match the product.
Practical A10 Optimisation Checklist
- â Main image: white background, product fills 85%+ of frame, high resolution
- â Title: primary keyword in first 80 characters, readable, no keyword stuffing
- â Bullet points: benefit-first, secondary keywords woven naturally, mobile-readable
- â Backend search terms: 249 bytes max, unique terms not in listing, no repetition
- â A+ Content: increases CVR which directly improves ranking
- â Price: within 20% of category average for similar specification
- â Fulfillment: FBA where possible - dramatically improves ranking eligibility
- â External traffic: even one Amazon Attribution link from a social post drives the signal
How Long Does It Take to Rank?
For a brand new ASIN with zero history, reaching page 1 for a competitive keyword typically takes 45 to 90 days with a properly executed launch strategy. For existing ASINs being re-optimised, meaningful rank improvement is usually visible within 14 to 21 days of listing changes - provided conversion rate improves alongside the optimisation.
Frequently Asked Questions
Amazon has never officially named or confirmed "A10." It's the label the seller community uses for the ranking behaviour observed from roughly 2020 onwards. The actual mechanism is a proprietary machine learning system weighing hundreds of factors, so treat A10 as shorthand for observed changes rather than a documented Amazon product.
Sponsored Products sales still contribute to velocity, but the direct link between PPC spend and organic rank is weaker than it was under A9. Organic sales carry more ranking weight now, and signals like organic click-through rate, external traffic and seller authority sit alongside ad-driven volume. Buying rankings with spend alone no longer holds.
External traffic is weighted significantly in A10 and is the biggest change from A9. Traffic from Google, Meta, TikTok, email and influencers tells Amazon your brand has genuine demand beyond the platform. Even small external campaigns can meaningfully boost organic rank, and one Amazon Attribution link from a social post starts feeding the signal.
For a brand new ASIN with zero history, page one on a competitive keyword typically takes 45 to 90 days with a properly executed launch. Existing ASINs being re-optimised usually show meaningful rank improvement within 14 to 21 days of listing changes, provided conversion rate improves alongside the optimisation.
Want a Full Listing SEO Audit?
SellerVine will analyse your listings against all A10 ranking factors and show you exactly what's holding your organic rank back - at no cost.
Get My Free Listing Audit â
