The UK Competition and Markets Authority (CMA) has published draft conduct requirements for Google, marking the first use of its enhanced digital markets powers. Under the proposals, Google would be obliged to allow website owners and news publishers to opt out of having their content used in AI-generated search summaries without being removed from search results altogether. The rules also demand greater transparency in Google’s ranking algorithms, prohibit the preferential treatment of advertisers or punitive measures against critics, and require clear disclosure of how AI Overviews are generated. These measures follow the CMA’s designation of Google last year as a "strategic" player in online search advertising, a label that triggered today’s unprecedented intervention.

Industry estimates suggest that since the rollout of AI Overviews, some news publishers in the UK have seen traffic declines of up to 15% as users rely on summaries rather than clicking through to full articles. The CMA’s draft rules aim to reverse this trend by giving publishers a "meaningful choice" over participation, including controls to disable generative AI features on specific pages. Google has indicated it will update its site controls in response. Additionally, the requirement for precise source citations in AI responses could drive publishers to negotiate new licensing or revenue-sharing arrangements, potentially reshaping search monetization models in a market estimated to generate over £7 billion in annual ad revenues.

The CMA consultation runs through February 25, after which final rules are expected by the end of Q2 2026. Investors should monitor the degree of publisher pushback during the consultation and the CMA’s final stance on transparency obligations and default-search choice screens for Android and Chrome, which could influence Google’s user acquisition costs. Compliance may require additional engineering and legal investment, with the potential to disrupt Google’s core search advertising margins in the UK—currently accounting for roughly 8% of Alphabet’s global search revenue. A strict final regime could also embolden regulators in the EU and other jurisdictions to pursue similar measures.