SEO and GEO/AEO Statistics (2026): 50+ Verified Data Points on Search Volume, AI Overviews, and the New Citation Economy

Across 68,879 Google searches studied by Pew Research Center in March 2025, just 1% of users clicked a source link inside an AI-generated summary, while traditional click-through rates on the same searches dropped to 8%, almost half the rate seen on searches without an AI summary (Pew Research Center, July 2025). Ahrefs' 300,000-keyword analysis found that AI Overviews now correlate with a 58% lower click-through rate for the top-ranking organic page (Ahrefs, December 2025 update). And in the UK, Ofcom's Online Nation 2025 found that 53% of UK adults now report seeing AI overviews often when they search.

This article aggregates and verifies 50+ data points from primary sources — Pew Research Center, Princeton University, Ofcom, the Office for National Statistics, SparkToro/Datos, Statcounter, Ahrefs, BrightLocal, Conductor, BrightEdge, the Federation of Small Businesses, OpenAI, and others — to give an evidence-led view of where Search Engine Optimisation (SEO), Generative Engine Optimisation (GEO), and Answer Engine Optimisation (AEO) actually stand in 2026.

Key Takeaways

• Google held 90.04% of the global search engine market and 91.47% in the United Kingdom as of April 2026 (Statcounter GlobalStats, April 2026).
• 18% of all Google searches in March 2025 produced an AI Overview; for question-based searches the rate was 60%, and for queries of 10+ words it was 53% (Pew Research Center, July 2025).
• 58.5% of Google searches in the United States and 59.7% in the EU resulted in zero clicks to the open web (SparkToro/Datos, July 2024).
• AI Overviews reduce click-through rate for the position-1 organic result by 58% (Ahrefs, February 2026).
• 88% of AI summaries in Google search cite three or more sources; only 1% cite a single source (Pew Research Center, July 2025).
• The Princeton/Georgia Tech/IIT Delhi GEO paper found visibility in generative engine answers can be lifted by up to 40% using cite-sources, statistics-addition, and quotation-addition strategies (Aggarwal et al., KDD 2024).
• ChatGPT received 1.8 billion UK visits in the first eight months of 2025, up from 368 million in the same period of 2024 (Ofcom *Online Nation 2025*).
• 27% of UK adults now use AI chatbots; 16% have used them for health and wellbeing advice (Ofcom Online Nation 2025).
• 71% of consumers say Google is their primary platform for finding local businesses, down from 83% in 2025; 45% now also use ChatGPT or similar tools for local recommendations, up from 6% the previous year (BrightLocal *Local Consumer Review Survey 2026*).
• 60% of UK businesses now employ an SEO strategy and 56% use local SEO (LocaliQ UK Digital Marketing Statistics, 2025).
• ChatGPT reached 900 million weekly active users in February 2026 — 2.25x the 400 million reported a year earlier (OpenAI, February 2026).
• Pages that earn rich results from structured data have measured up to 82% higher click-through rates in case studies published by Google (Google Search Central).

1. The Search Engine Landscape: Volume, Market Share, and the UK Picture

Search remains the largest organic discovery channel on the internet, but the surface has fragmented. Google still processes the overwhelming majority of queries globally, and an even greater share in the UK, while search itself has expanded into AI assistants and on-platform search inside YouTube, Reddit, Amazon, and TikTok. The headline figures below set the baseline against which all GEO/AEO data should be read.

Google handled an estimated 13.7 billion searches per day globally in 2025, up from earlier published figures of 8.5 billion daily, after Google's own Year in Search disclosures revised annual volume above 5 trillion queries (Google, Search highlights 2025; Backlinko, Google Search Statistics 2026).

For UK SMEs, the practical implication is that Google still dominates discovery — but a Google-only strategy increasingly leaves measurable demand on the table inside AI assistants. The technical baseline (crawlability, structured data, page experience) underpinning SEO services is the same baseline AI engines use to decide which pages to cite.

2. Click-Through Rates and the Zero-Click Reality

Zero-click search is no longer a forward-looking risk; it is the dominant outcome on Google. The shift began before AI Overviews — Google's own SERP features (knowledge panels, featured snippets, People Also Ask) had already absorbed roughly half of all clicks — but AI Overviews have accelerated the trend on the queries where they appear.

SparkToro and Datos found that for every 1,000 Google searches in the United States, only 360 clicks went to the open web, with 58.5% of searches ending in zero clicks (Rand Fishkin, SparkToro, 2024 Zero-Click Search Study, July 2024).

3. AI Overviews: Adoption, Industry Reach, and CTR Impact

AI Overviews are the first generative AI feature inside core Google Search to reach a mass audience. They launched in the UK in August 2024 and reached the global threshold of 2 billion monthly users by July 2025 (Google, I/O 2025 announcements). Adoption rates differ wildly by methodology — Pew sees roughly one in five searches; Conductor sees a quarter; BrightEdge sees nearly half once tracked across nine industries — because each measures a different keyword universe.

Pew Research Center's panel of 900 US adults found that 18% of Google searches in March 2025 produced an AI summary, but on question-form queries the rate jumped to 60%, and on queries of 10 or more words it reached 53% (Pew Research Center, July 2025).

The practical effect: rankings still matter, but the asset being ranked has changed. Pages that earn AIO citations and rich results capture impressions even when click-through compresses, which is why technical SEO and authority-building work — the core of effective SEO services — remain the foundation, not a legacy concern.

4. Generative & Answer Engine Optimisation: How AI Picks Sources

Generative Engine Optimisation (GEO) and the related discipline of Answer Engine Optimisation (AEO) cover the practices that improve a brand's odds of being cited inside AI-generated answers — by Google AI Overviews, ChatGPT, Perplexity, Bing Copilot, and Gemini — rather than (or in addition to) ranking on a traditional results page. The seminal academic study comes from Princeton University, Georgia Tech, the Allen Institute for AI, and IIT Delhi.

The Princeton-led GEO paper showed visibility in generative-engine answers can be improved by up to 40% using three content tactics — citing authoritative sources, adding statistics, and adding quotations (Aggarwal et al., KDD 2024; arXiv:2311.09735).

Citation patterns differ sharply by engine. Profound's 2025 cross-platform analysis found Wikipedia is ChatGPT's most cited single source (around 7.8% of citations), Reddit leads in both Google AI Overviews and Perplexity, and only 11% of domains cited by ChatGPT are also cited by Perplexity (Profound, AI Platform Citation Patterns, 2025). Semrush's three-month, 230,000-prompt study across three large language models confirmed Wikipedia and Reddit as the dominant repeat-citation sources, with Wikipedia appearing as the #1 or #2 cited source in four of five verticals studied.

The composition of AIO-triggering queries is also shifting toward commercial intent. Conductor's 2026 benchmarks found that informational queries fell from 91.3% of AIO triggers in January 2025 to 57.1% by October 2025, while commercial queries rose to roughly 19% and navigational AIO triggers grew from 0.74% to 10.33% (Conductor, November 2025).

5. Local SEO: Maps, Reviews, and Mobile Search Behaviour

Local search is where SEO becomes most directly tied to revenue for service businesses, retailers, and professional firms. Mobile dominates the channel, and Google still owns the consumer journey from query to map pack to direction — but AI tools are now a measurable third source of recommendations.

BrightLocal's *Local Consumer Review Survey 2026* found that 71% of US consumers use Google to find local businesses (down from 83% the year before), while 45% now use ChatGPT or similar AI tools for local recommendations — up from 6% in 2025.

The implication for UK service businesses: review velocity, freshness, and Google Business Profile completeness are now both ranking factors and citation factors, since AI tools draw heavily on the same review and structured-data signals when generating local recommendations. Aristral's local SEO approach (Google Business Profile optimisation, citation cleanup, localised content, and on-page schema) maps directly to the signals BrightLocal's data identifies as decisive.

6. SEO Investment, ROI, and the UK Business Picture

SEO budgets continued to grow through 2025 and into 2026, despite — and in several reports because of — the AI search shift. The argument is straightforward: when LLMs draw their answers from web pages that already rank, the value of ranking has compounded, not collapsed. The UK SME picture is somewhat behind US peers on website ownership and SEO spend but is rapidly closing the gap.

60% of UK businesses now employ an SEO strategy and 56% use local SEO, according to LocaliQ's 2025 UK Digital Marketing Statistics analysis aggregating ONS, Ofcom, and FSB data sources.

For UK SMEs specifically, the data points to two things: (1) SEO investment is expected, not optional, even at the small-business end; and (2) the combination of organic search, AI search, and local discovery now spans services that historically lived in separate silos — which is why a unified digital marketing agency approach across SEO, content, and AI search visibility tends to outperform single-channel programmes for businesses below £10M revenue.

7. The Rise of AI Search: ChatGPT, Perplexity, and Referral Traffic

The new AI search landscape has settled into a recognisable shape: ChatGPT is by far the largest single platform, but Google's Gemini and AI Mode are growing fastest, Perplexity has carved out a citation-heavy niche, and Microsoft Copilot has built distribution through Windows, Edge, and 365. Referral traffic from AI tools to the open web is growing rapidly in percentage terms but remains a small fraction of Google's organic referral volume.

ChatGPT reached 900 million weekly active users in February 2026, up from 400 million a year earlier, putting the service within reach of a one-billion-user milestone (OpenAI / TechCrunch, February 2026).

UK-specific behavioural data from Ofcom is especially useful here: 27% adoption is high enough that no UK consumer brand can afford to ignore AI search visibility, but low enough that the channel is still primarily a complement to (not a replacement for) Google. Pew's October 2025 attitudes survey of 5,153 US adults reinforces the same balance: 20% find AI summaries extremely or very useful, 52% find them somewhat useful, and 53% trust the information at least somewhat (Pew Research Center, October 2025).

SEO and GEO/AEO by the Numbers

Methodology and Sources

This article prioritises primary-source data: original surveys, datasets, and academic papers from Pew Research Center, Princeton University and partner institutions, Ofcom, the Office for National Statistics, the Federation of Small Businesses, OpenAI, Statcounter, SparkToro/Datos, Ahrefs, BrightLocal, BrightEdge, Conductor, Authoritas, Adobe Analytics, Similarweb, Semrush, and Google. Where market-size or industry-share figures vary materially across sources, both the figure and the methodology caveat are stated inline. No statistic is included unless its underlying source has been directly verified.

Where the most recent good data is older than the target reporting year, this is labelled explicitly (for example, the SparkToro/Datos 58.5% / 59.7% headline is from data through May 2024; the Princeton GEO paper is from KDD 2024).

• Pew Research Center (2025) — Google users are less likely to click on links when an AI summary appears
• Pew Research Center (2025) — Americans have mixed feelings about AI summaries in search results
• Aggarwal et al. (2024) — GEO: Generative Engine Optimization (KDD 2024)
• Ofcom (2025) — Online Nation 2025
• Office for National Statistics — Internet sales as a percentage of total retail sales
• Federation of Small Businesses — UK Small Business Statistics
• SparkToro/Datos (2024) — 2024 Zero-Click Search Study
• Statcounter GlobalStats — Search Engine Market Share Worldwide / United Kingdom
• Ahrefs (2026) — Update: AI Overviews Reduce Clicks by 58%
• BrightLocal — Local Consumer Review Survey 2026
• BrightEdge — 9-Industry AI Overviews Tracker (via Search Engine Journal)
• Conductor (2025) — 2026 AEO/GEO Benchmarks Report
• Authoritas — The State of AI Overviews — User Intent Research
• Adobe Analytics (2025) — Generative AI-Powered Shopping Rises
• Similarweb — AI Referral Traffic Winners by Industry
• Semrush — The Most-Cited Domains in AI: A 3-Month Study
• OpenAI / TechCrunch (2026) — ChatGPT reaches 900M weekly active users
• LocaliQ — UK Digital Marketing Statistics 2025