Three things shifted under Amazon sellers this week — and not one of them showed up in your dashboard.
Brand Registry quietly turned into a takedown weapon. Third-party share went backwards for the first time in 22 years. And AI just became the layer that decides whether a shopper ever sees your listing.
This issue is your heads-up before any of it costs you.
- Sell your products on Walmart.com 🛍️
- Amazon is quietly killing unauthorized ASINs—and the Buy Box is bleeding too 🔺
- 3P shares just fell two wuarters in a row—the first time in 22 years 📉
- 83% of sellers use AI. 25% can’t tell if it’s working 🤖
AMAZON NEWS
Sellers started seeing this exact message land in Seller Central this week: "We are taking this action because these ASINs were created for brand-registered products without authorization from the brand owner."
Translation: if you've been spinning up listings (or variations) on a Brand Registry product without being on the brand's authorized seller list, your ASIN is on the chopping block. Amazon is tightening enforcement of its ASIN Creation Policy, and the takedowns are real.
At the same time, a separate group of resellers is reporting Buy Box share has dropped noticeably across multiple accounts over the past 2–3 weeks — with no policy violations, no account health changes, no obvious trigger. One seller publicly attributed a $300K loss to Buy Box suppression after the same brand was sold below MAP on a competing marketplace.
🖼️ The bigger picture
Two stories, one theme: Amazon is leaning harder into brand control. Brand Registry is becoming less of a defensive shield and more of an enforcement weapon — and the off-Amazon pricing of your brand is now actively dragging your on-Amazon visibility.
Bonus chaos: SHEIN leadership and Ed Rosenberg are co-hosting an in-person ASGTG meetup in Brooklyn on May 19. SHEIN Marketplace is courting US resellers more aggressively than it ever has — worth a flight if you're sitting on inventory looking for a second home.
🖊️ What to do
- If you sell brand-registered products as a 3P, confirm you're on the brand's authorized seller list before creating any new variations, parents, or child ASINs
- Pull your last 30 days of Buy Box win rate by ASIN — if there's a sudden cliff with no obvious cause, document it and open a case before more sales bleed out
- For brand owners: audit your authorized reseller list now. Amazon's enforcement push just made it dramatically easier to remove unauthorized listings — but only if your list is current
- Sanity-check off-Amazon pricing on your top SKUs. If a marketplace partner is undercutting you, that may be the silent cause of your Buy Box dip
⚠️ The honest caveat
The Buy Box drops aren't confirmed as a single platform-wide change — Amazon hasn't said anything publicly. Could be an algorithm tweak. Could be enforcement spillover. Could be MAP-related suppression. Until Amazon acknowledges it, treat it as signal, not gospel.
TOGETHER WITH WALMART MARKETPLACE
Build, grow, and elevate your ecommerce business with Walmart
Build, grow, and elevate your eCommerce business with one of the most trusted names in retail.
Sell your products on Walmart.com. Designed with sellers in mind, Walmart Marketplace is one of the fastest-growing eCommerce platforms in the U.S.
Walmart Marketplace sellers get access to:
- a network of millions of customers
- innovative programs that help you scale
- Walmart’s omnichannel advantage
It takes just a few steps to start selling.
Join Walmart Marketplace today
*Conditions apply. Sign up today.
ECOMMERCE NEWS
Amazon’s marketplace just plateaued—here’s what changes for sellers
Third-party sellers accounted for 60% of paid units sold on Amazon in Q1 2026, down from 61% in Q4 2025 and 62% the quarter before that. It's the first time the metric has fallen for two consecutive quarters since Amazon started breaking it out in 2004.
For more than a decade the marketplace's share only moved one way. Between 2013 and 2016, it gained a percentage point every single quarter for eleven straight quarters. The all-time peak was 62% in Q4 2024 — and it held within a 61–62% band for five consecutive quarters before this back-to-back decline.
🖼️ The bigger picture
Two 100-basis-point drops don't bury the 3P thesis. Sellers still account for 60% of units and an estimated 69% of GMV. But the unrelenting climb is over — and Amazon's growth story is increasingly being told outside the marketplace, in AWS, in advertising, and in the agentic commerce layer now being built on top of both.
For sellers, that means the platform you're on is maturing. The category-level land grab of 2014–2022 isn't coming back. The next phase is share-of-wallet, not share-of-shelf.
🖊️ What to take away
- 1P is creeping back. If you sell in a category Amazon competes in directly, expect more aggressive Amazon Basics-style entries — and price compression on commodity SKUs
- Margin pressure on your end may not be coming from other 3P sellers. It may be the algorithm rebalancing toward 1P inventory it owns the margin on
- Diversification finally matters more than it sounds like it should. TikTok Shop US did $4.9B in Q1 alone(up 46% YoY). Walmart Marketplace and SHEIN US are both growing fast enough to be more than a hedge
🎯 The bottom line
Amazon's marketplace isn't shrinking — it's plateauing. The next decade of seller growth probably isn't about taking more share of the same pie. It's about being on enough plates that one slow quarter on Amazon doesn't sink you.ore fee leverage — not less. If it's softening, a DD+7 rollback gets a lot more likely.
TRENDING TOPIC
83% of Amazon sellers are using AI. 25% can't tell if it's working.
The Marketplace Pulse 2026 Seller Index dropped this week, surveying sellers with $2B+ in combined annual revenue. The headline: 83.4% now use AI somewhere in their operations, averaging 3.2 use cases each.
The kicker: 25.4% report no measurable results yet — the single largest response when sellers were asked about impact.
🔍 What sellers are actually using AI for
- Listing optimization: 63.5%
- Image/video creation: 49.2%
- Advertising, pricing, competitive intel, inventory forecasting: well behind
Translation: most sellers are still using AI as a fancy copywriter, not as an operations layer. Meanwhile consumers are sprinting past — Adobe reported a 393% YoY jump in AI retail traffic in Q1 2026, and AI-referred visitors convert 42% more than non-AI traffic.
🖼️ The bigger picture
AI isn't a content tool anymore — it's becoming the discovery layer itself. Three things shipped in the last week that make the shift impossible to ignore:
- Helium 10 launched the first OpenAI-approved ChatGPT app for Amazon tools. Connect your H10 account inside ChatGPT, drop in an ASIN, get analysis pulled directly from the H10 dataset — no tab-switching. It's bare-bones today, but it's the template every Amazon SaaS is about to copy.
- Rufus now ties search results to a personal "About you" profile. Shoppers describe themselves in free text — style, hobbies, household, who they shop for — and the saved profile follows them across Rufus, Alexa, and the broader Amazon experience. Two shoppers running the same query now get different stacks based on saved identity.
- Rufus turns handwritten shopping lists into Amazon carts. Photograph a grocery or shopping list, upload it, Rufus transcribes and adds items directly to cart. iOS first, Android to follow.
🖊️ What to do
- If your listings still read as generic feature dumps, rewrite them with explicit audience-anchoring language("for new parents who…", "designed for renters in small apartments…"). Rufus is now matching identity, not just keywords
- Test your top-volume ASINs inside ChatGPT — with and without the Helium 10 app connected — and see what surfaces. If nothing does, that's the gap to close
- Stop measuring AI ROI as "did it write the bullets faster?" Start measuring conversion lift, ACoS movement, and session-to-purchase on AI-touched listings vs. control
🎯 The bottom line
The 25% reporting zero impact aren't using AI wrong — they're using it for the wrong job. Bullets and hero images are table stakes now. The sellers about to break away are the ones wiring AI into pricing, replenishment, and competitive monitoring before everyone else does.
The discovery layer is being rebuilt in real time. You're either feeding it identity-anchored content and structured data, or you're getting routed around.
