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We publish original research on Amazon's ranking algorithm under CC-BY-4.0. Quote, link, embed, translate — no permission needed, attribution appreciated.

Quick facts

What is ListFocal?
An independent research studio publishing data-driven analysis of Amazon's organic ranking algorithm (A10), with free AI tools and a public 17,932-listing panel.
Founded
2026, Tokyo and Shenzhen
Research panel size
17,932 active Amazon US listings tracked daily across 9 subcategories. ~376,000 daily observations.
Methodology
Ridge regression with listing-level fixed effects, validated across 10 alternative specifications. R²=0.56.
Licensing
All published research figures CC-BY-4.0. Tools and dispatches free for non-commercial reuse with attribution.
Editorial independence
No affiliate revenue. No paid placements in tools or research. Pro tier (Q4 2026) funds ongoing research.

Headline research findings

Each finding is a citable, quotable line from a published dispatch. Click through for the full data and methodology.

  1. 01

    Amazon's May 2026 A10 algorithm rewrite shifted weight off relevance and onto conversion

    Inferred weight on 14-day conversion velocity (CVR-14) rose 11 percentage points; title-keyword relevance fell 6 points. The largest single shift measured in 3 years of panel tracking.

    ListFocal A10 dispatch (May 24, 2026) →
  2. 02

    200-character Amazon titles now underperform 140-165 character titles by 18% on CTR

    Across 9,184 listings, medium-length titles outperformed long titles in every subcategory measured. Despite this, every major Amazon SEO tool still recommends pushing toward the 200-character ceiling.

    ListFocal Title Length dispatch (May 26, 2026) →
  3. 03

    Amazon PPC affects organic rank — but only when the listing already converts

    A 40%+ PPC spend increase produced a 4.2-position rank gain for above-median-CVR listings and a 3.1-position rank loss for below-median-CVR listings. Amazon's official position (no direct A10 weight on PPC) is technically correct but practically misleading.

    ListFocal PPC × A10 dispatch (May 27, 2026) →
  4. 04

    Outcome-led Amazon bullet points convert 2.1× better than feature-led bullets

    540 controlled A/B tests across 9 subcategories. The advantage holds across consumer categories but compresses to 1.4× in technical-buyer categories (USB hubs, networking, professional audio).

    ListFocal Bullet dispatch (May 31, 2026) →
  5. 05

    Amazon Vine review timing matters more than Vine quantity

    Spread-Vine campaigns (60-90 day enrollment) outperformed concentrated-Vine campaigns (≤14 day enrollment) by 4.3 rank positions at day 120, despite identical final review counts. Amazon's algorithm weights review velocity, not review count.

    ListFocal Review Velocity dispatch (June 7, 2026) →

Expert sources

ListFocal researchers are available for interviews, background, and methodology questions. Email below; we typically respond within 24 hours on weekdays.

Amazon's A10 algorithm and ranking signals

[email protected]

Cross-border e-commerce, Chinese seller market

[email protected]

Amazon advertising (Sponsored Products, ACoS/TACoS) and PPC economics

[email protected]

Brand assets

Logo · OG image

1200×630 PNG, brand color #0F4F4A, suitable for editorial use.

Company backgrounder

Studio mission, methodology overview, founders.

Citation format

When citing our research, please link the specific dispatch URL. For academic citations, use this format:

ListFocal Studio. (2026). The A10 algorithm, after Amazon's quiet May rewrite. ListFocal Dispatch.
Retrieved from https://listfocal.com/dispatches/amazon-a10-algorithm-2026-rewrite

Other questions? Email [email protected]