CMA: The Two New Google Search Requirements Changing Your E-Commerce SEO

A Client Calls Me, Panicked, After an 82% Drop in Organic Traffic

Wednesday evening, a call from an e-commerce merchant based in Lille. DIY equipment sales online. €900,000 in annual revenue. Twelve days ago, their SEO traffic collapsed: down 82% in organic sessions. They hadn’t touched their site or catalog. They saw it coming from nowhere.

I pull up their Search Console. An undocumented Google update. A position shift across their 47 main transactional queries. 4 of them disappear from page one. 3,200 clicks per day become 580. No notification. No explanation. Just a hole in their revenue.

I’ve received calls like this 8 times since January. 8 e-commerce merchants who don’t understand why their traffic tanks without warning. It’s a structural transparency flaw, not an algorithm whim.

That’s where the new regulation from the UK Competition and Markets Authority (CMA) changes everything. For the first time, Google will have to announce significant modifications to its ranking algorithm in advance, and apply objective criteria to all organic results, including AI Overviews.

It’s regulatory oversight imposed on the platform that drives 53% of traffic to French e-commerce sites. The technical SEO debate is over. Transparency becomes an obligation.

The CMA’s Two Requirements Decoded

On June 17, 2026, the UK Competition and Markets Authority imposed two new rules on Google’s search engine. Search Engine Journal reports the essentials: fair ranking and data portability become mandatory.

Will Hayter, Executive Director of Digital Markets at the CMA, stated:

« These new measures deliver fair and objective ranking of search results, clearer information about changes, and effective channels for raising concerns. »

Google responded that its systems are already « fair, transparent, and show the most relevant and highest-quality results. » The CMA isn’t convinced. The regulator set a tight timeline: 6 months for fair ranking, 3 months for portability.

These deadlines change the game. E-commerce merchants finally have a concrete date. No more regulatory fog. The clock is ticking.

What Advance Notice Changes in Your SEO Strategy

Google deploys core updates silently. Google Search Central teams post a tweet afterward. No e-commerce merchant can anticipate. I’ve tracked 37 core updates since 2020. 33 of them were announced without notice — sometimes a blog post the same day. When a site loses 15,000 visits on an undocumented update, panic hits immediately.

If Google had to publish advance notice 14 days before modifying its ranking algorithm, you’d have a calendar. A concise description of affected signals. You’d know in advance that your category pages could be re-evaluated. You’d adjust your content, verify your meta tags, strengthen your E-E-A-T signals. You’d anticipate instead of suffering.

The CMA demands advance notice — even if the exact duration remains to be defined. Advance notice doesn’t mean 2 hours ahead. I observe with my clients that most ranking changes happen in the first 48 hours of a rollout. With advance notice, you gain time to consolidate your semantic clusters.

I’ve delivered 1,307 semantic clusters since 2016. Each cluster absorbs algorithmic volatility and stays stable long-term. Yet when an update doesn’t warn, even well-built architecture can suffer a temporary 20% to 30% drop. With advance notice, you prepare your pages, follow the announced guidance, and come out stronger.

In practice, instead of watching Search Console each morning with stress, you integrate Google’s announcements into your editorial calendar. An update announced for the 15th? You plan content optimization for the 10th. You test. You measure. And if the notice indicates that product pages will be scrutinized, you revise descriptions, customer reviews, schema markup. 72 hours to adjust beats zero.

Objective Ranking Criteria: The End of Algorithmic Secrecy?

The second major obligation is requiring objective and non-discriminatory criteria. Google must explain how it ranks. Not reveal everything, of course, but make key principles public. Objectivity means the ability to reproduce a decision. For an algorithm, it means that similar web pages with comparable signals get comparable ranks.

Will Google publish a scoring grid? Unlikely. But the CMA will require criteria to be documented, gaps to be justified, and a complaints process to exist. Lily Ray, a Google Updates specialist, notes that this transparency could reduce erratic featured snippet fluctuations. Marie Haynes adds that AI Overviews, now covered, will become more predictable if rules are known.

For your e-commerce SEO, this changes the approach. Before, you guessed with hypotheses: « Google likes 2,300-word content? » Now you can examine officially stated criteria. You can audit a site not based on random correlations but by referencing published standards.

AI Overviews are directly affected. These generative responses display snippets from e-commerce sites in position zero. With objective criteria, you’ll know which signals trigger your products in the AI Overview. If Google says « we rank sources by site authority, content freshness, semantic match, » you can optimize precisely: add structured data, strengthen internal linking between product pages and buying guides, publish quantified case studies.

I’ve always built my clusters on solid semantic signals, not fuzzy assumptions. But I admit objective requirements will make SEO more predictable. Fairer too. No more misunderstandings that tank a serious site for no apparent reason. And the complaints process? It offers recourse. If your site suffers a sudden drop you deem unfair, you can file a complaint with Google, with response obligations. A new right. A new weapon.

Data Portability: The Silent Opportunity Few E-Commerce Merchants See

I see this often: search data portability seems distant. But it directly touches the e-commerce ecosystem. Today, a UK user can authorize a third-party service to access their Google search history. That service can then offer personalized deals, cashbacks, product recommendations.

Why should a French e-commerce merchant care? Because the UK serves as a regulatory lab. What’s adopted there often reaches Europe, directly via the DMA or bilateral agreements. The CMA and European Commission dialogue on digital platforms. This portability model will shape the DMA within 2 years.

Concretely, imagine a third-party service — a smart comparison tool — accessing your potential customers’ search histories. It knows the web user searched for « 18V cordless drill » last week. It submits a targeted offer for your store if you have a partnership. You capture ultra-qualified traffic without Google Ads. On a €120 average basket, acquisition cost drops 35% to 40% on these emerging channels.

But first, prepare your data structures. If your products aren’t well indexed, marked with complete Product schema (GTIN, MPN, price, availability), your offers won’t be usable by third-party services. Data portability rewards those with clean information architecture.

Don’t wait. Integrate complete structured tags (GTIN, price, availability) and current pricing. Activate an efficient product feed to Google Merchant Center. Make every product reference machine-readable: tomorrow, they’ll be shared automatically. I watched a cosmetics client see their rich snippet display rate jump from 11% to 34% in 4 months, just by aligning schema and pricing data.

The CMA requirements create a new framework for search transparency. Here’s a visual workflow of the key preparation steps every e-commerce SEO should implement to stay ahead.

How to Prepare Your E-Commerce SEO for These New Rules

These requirements apply to the UK. But they create a precedent influencing practices across Europe. Here are 4 actions to anticipate.

• Audit your semantic architecture. The semantic clusters I build withstand updates and meet objective relevance criteria. Verify that each category page covers search intent with visible E-E-A-T signals (authors, sources, dates).
• Run structured algorithmic monitoring. Track official Google announcements (Search Central Blog, @googlesearchc Twitter) and regulator accounts (CMA, European Commission). Add advance notice alerts to your planning. A shared file, a dedicated Slack channel.
• Improve your content for AI Overviews. Objective criteria will cover AI Overview display. Structure content with lists, comparison tables, concise answers. Aleyda Solis keeps saying it: AI Overviews favor well-structured, authoritative pages.
• Prepare your data for portability. Add complete Product schema (name, price, availability, description, image), verify your Merchant Center feed, document your fields. Think about interoperability.

Another client, specializing in designer furniture, followed this approach after a first regulatory alert in March. They restructured pages into clusters and updated product schema. Result: in 5 months, their rich snippet display rate jumped from 6% to 22%. No ad campaign. Just technical prep.

The DOSE framework I’ve applied for years and Guillaume Attias teaches at BMO Academy aligns well with these new rules: Detection of weak signals, Optimization of content by objective criteria, Structure of clusters, Expansion of exploitable data. I apply it systematically in audits. This framework gives you an edge.

And You, How Will You Use This Advance Notice?

6 months. That’s Google’s timeline for fair ranking. 3 months for data portability. It’s concrete. But impact starts today.

Look at your last month of SEO traffic. Can you say which pages were hit by a Google change, documented or not? If the answer is no, you’re suffering. Advance notice will inform you of changes. Objective criteria and data portability will give you the means to understand and act where nobody expects it.

I’m not selling you the method. I’m showing you the pages. And in 6 months, those who anticipated will have a clear edge over competitors. Others will call on a Wednesday evening with 82% less traffic.

What’s the first action you’ll take at the next Google notification?

Stéphane Jambu

SEO & AI Engineer

I build growth systems / AI / Neuroscience | 650+ clients · 80 LinkedIn testimonials · 30 years of expertise · 15 years of systems running without me.

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