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What the CMA actually opened
The January 2025 proceeding examined whether Google met the statutory test for SMS under the UK’s new digital-markets competition regime. That test concerns a company’s substantial and entrenched market power and its strategic significance to the UK economy.
Calling it an “antitrust investigation” is understandable shorthand, but legally incomplete. An SMS-designation investigation is different from a conventional competition-law infringement case. It does not itself establish that Google has acted unlawfully. If designation is made, the CMA can impose tailored conduct requirements and consider broader pro-competition interventions.
- SMS designation investigation: assesses whether a firm has entrenched power and strategic significance.
- Conduct requirement: imposes a targeted rule on an SMS firm to address a defined competition or fairness concern.
- Competition-law infringement investigation: tests whether conduct breaches competition law and can lead to an infringement decision, fine or remedy.
- Market investigation or pro-competition intervention: addresses wider structural problems and can require more extensive remedies.
The UK digital-markets regime came into force in January 2025, according to the CMA’s programme page.
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Timeline: from investigation to AI-focused requirement
| Date | Development | What it means |
|---|---|---|
| 1 January 2025 | UK digital-markets competition regime came into force. | The CMA gained its new SMS framework. |
| 14 January 2025 | CMA opened the Google Search investigation. | The initial question was whether Google’s general search and search advertising should be designated as SMS activities. |
| October 2025 | CMA designated Google as having SMS in general search. | The designation covered general search and search advertising activities, according to the CMA’s 2025–26 annual report. |
| 18 March 2026 | Google published its response to the CMA’s consultation on possible Search requirements. | Google argued for fairness and publisher choice, while warning that rules should preserve user experience. |
| 3 June 2026 | CMA imposed a publisher conduct requirement. | The measure addresses generative-AI use of publisher content, controls, engagement information, attribution and access. |
The original announcement was reported by TechCrunch on 14 January 2025. By August 2026, this should be understood as an ongoing digital-markets intervention rather than a newly opened case.
Why Google’s UK search share matters
The CMA says Google handles more than 90% of general-search queries in the UK. This is a measure of UK general search, not ownership of “90% of the internet.” The same annual report says more than 200,000 UK businesses spend over £10 billion each year on Google search advertising.
A share that large can indicate market power when it persists and is reinforced by defaults, distribution agreements, data, scale and the importance of ranking access. Publishers need visibility to reach readers; advertisers need access to users; and businesses can find it difficult to replace a channel that combines search intent, audience scale and advertising tools.
Market share alone does not prove unlawful monopolisation. The competition question is whether Google’s position, practices and control over adjacent systems make it harder for rivals, publishers or advertisers to compete.
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What “general search” covers
The designation concerns Google’s conventional web-search service and associated search advertising. In practical terms, that includes:
- web-search results and ranking;
- the presentation of results and search features;
- access between users, publishers and businesses through search; and
- advertising sold alongside the general-search service.
It does not automatically cover every Google product. YouTube, Android, Chrome, Gmail and Google Cloud are not made part of this search designation merely because they belong to Google. Google’s mobile-platform SMS work is a separate matter; the CMA has discussed that work in a February 2026 blog post.
The competition issues behind the case
Ranking and possible self-preferencing
A regulator can ask whether a dominant search engine gives its own services an advantage in ranking or presentation. Google says it does not give its own products special treatment and points to earlier CMA reviews in arguing that there was no direct evidence of such conduct. That is Google’s position, not a final CMA finding.
Publisher traffic and access
Search ranking, snippets and AI-generated answers can change how much traffic reaches an original publisher. A site can continue to receive impressions while losing clicks if users obtain an answer directly on the results page.
Generative-AI use of publisher content
AI-generated search features created a newer question: how publishers can control the use of their material, understand what is happening to it and receive credit when it appears in an answer. The CMA’s June 2026 requirement is the concrete regulatory response so far.
Search advertising
Organic search and paid search are related but not identical. The CMA’s concerns can include auction transparency, data advantages, access, reporting and possible conflicts arising from Google’s roles as search provider, advertising platform and market intermediary. The available record does not establish a specific unlawful advertising practice.
What the June 2026 publisher requirement does
The CMA’s publisher conduct requirement addresses Google’s use of publisher search content in generative-AI features. It requires measures concerning:
- effective publisher controls over whether and how search content is used in generative AI;
- clear explanations of how that content is used;
- metrics showing user engagement with publisher content in search generative-AI features;
- clear and accurate attribution; and
- a clear way for users to access the underlying publisher content.
This is not a general ban on AI summaries and does not guarantee that every publisher will receive more traffic or revenue. It is a targeted conduct rule, not a breakup order.
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Google’s response
In its 18 March 2026 response, Google said it supports fairness and publisher choice, denied giving its own products special treatment and argued that digital-market rules should preserve a useful user experience. Those arguments will be tested through the CMA’s monitoring and implementation process; they do not cancel the designation or the publisher requirement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this means for different groups
Users
Users could see clearer attribution, more direct links to original sources and more information about how content is used in AI features. Search presentation, rankings or product integrations could also change. Compliance may make some features less convenient or less widely available; that outcome is possible, not established.
Publishers
Publishers should focus on whether their content is used in generative-AI answers, what controls are available, which engagement metrics are supplied and whether attribution sends readers to the original site. A control to opt out of AI use may still leave a publisher wanting to appear in ordinary search, so those two choices should not be assumed to be identical.
Advertisers and small businesses
For the more than 200,000 UK firms identified by the CMA as spending over £10 billion annually on Google search advertising, transparency changes could make campaigns easier to evaluate. They could also alter acquisition costs, traffic patterns or the relative attractiveness of alternative channels. Nothing in the current record guarantees lower prices or higher rankings.
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Potential future measures could improve rival access to data, interfaces, distribution or users. Those changes would have to be balanced against privacy, security, abuse and operational risks. The CMA has not announced that every proposed intervention will be adopted.
What the CMA could do next
The CMA can monitor compliance with the publisher requirement, request reporting and consider additional conduct requirements if further problems are identified. Possible categories include transparency about ranking and data use, publisher controls, measurement obligations, fairer access to search or advertising systems and steps intended to reduce barriers to entry.
Those possibilities should not be confused with completed remedies. There is no verified breakup order, fine or finding that Google has already committed an antitrust infringement in this proceeding. UK measures also do not automatically apply in the United States, European Union or other markets.
Why the distinction matters
The significance of the case is not simply that Google has a very large share. It is that the CMA is using the UK’s SMS regime to set rules for how a dominant search platform ranks information, sells advertising, handles publisher content and mediates access to AI-generated answers. The January 2025 investigation began that process; the October 2025 designation and June 2026 publisher requirement made it concrete.
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