TL;DR
Google AI Overviews are deployed on 47% of informational queries in Europe (March 2026). Average CTR impact: -18% on organic results below the AI Overview. But sites cited in the AI Overview see their CTR increase by +22%. This guide compiles all the essential statistics and draws strategic lessons from them.
AI Overviews — those AI-generated summaries at the top of Google results — are the most significant change in SERPs since the introduction of featured snippets. Deployed in beta in the US in May 2024, they now cover Europe since October 2025.
But beyond Google's marketing announcements, what are the real figures? What is the actual impact on European organic traffic? This guide compiles the most recent and reliable statistics on AI Overviews, exclusively from European sources.
If you are looking for concrete strategies to appear in them, see our complete Google AI Overview guide.
1. AI Overviews deployment in Europe
Key deployment figures in Europe:
- 47% of informational queries in Europe trigger an AI Overview (Sistrix, March 2026).
- 23% of transactional queries trigger an AI Overview.
- 8% of navigational queries trigger an AI Overview.
- Language coverage: French, English, German, Spanish, Italian, Dutch, Portuguese — 7 European languages covered.
- Trend: +5 percentage points of coverage per quarter since the European launch.
Chart: evolution of AI Overviews deployment in Europe (Q4 2025 - Q1 2026)
Dr. Johannes Beus, founder of Sistrix (Bonn, Germany), who publishes the reference data on the subject, comments:
"The deployment of AI Overviews in Europe is following a faster pace than expected. Google is accelerating because user data shows high engagement with this format. For publishers and businesses, the adaptation window is shrinking every quarter."
2. Impact on CTR and organic traffic
The impact of AI Overviews on organic traffic is the most debated topic in European SEO. Here is the data:
Negative impact on non-cited results
- -18% average CTR for organic results in positions 1-3 when an AI Overview is present (Sistrix, March 2026).
- -35% CTR for results in positions 4-10 with AI Overview.
- -25% total clicks to third-party sites on SERPs with AI Overview.
Positive impact for sites cited in the AI Overview
- +22% CTR for sites whose link appears in the AI Overview (compared to a classic #1 organic result).
- +340% impressions for cited vs non-cited sites on the same query.
- 3.2 sources cited on average per AI Overview in French.
The conclusion is clear: AI Overviews create a two-tier system. Cited sites gain visibility; others lose it massively. The content optimisation strategy for AI is no longer optional.
3. Most affected sectors
| Sector | % queries with AI Overview | Organic CTR impact | Avg. sources cited |
|---|---|---|---|
| Health / Medical | 62% | -28% | 4.1 |
| Technology | 58% | -22% | 3.5 |
| Finance / Insurance | 51% | -20% | 3.3 |
| Education | 49% | -17% | 3.0 |
| Travel / Tourism | 44% | -15% | 3.8 |
| E-commerce | 31% | -12% | 2.8 |
| Legal | 45% | -24% | 2.9 |
Source: Sistrix Visibility Index, March 2026 — data on 50 million European queries.
4. Comparison by European country
The deployment of AI Overviews is not uniform across Europe. Differences are explained by the linguistic maturity of AI models and regulatory specificities (GDPR, Digital Markets Act).
| Country | AI Overview coverage | Launch date | Particularity |
|---|---|---|---|
| United Kingdom | 52% | August 2025 | First European market |
| France | 46% | October 2025 | CNIL restrictions on certain topics |
| Germany | 44% | October 2025 | Tensions with publishers (DMA) |
| Belgium | 43% | October 2025 | Bilingual FR/NL |
| Netherlands | 41% | November 2025 | Strong AI adoption by businesses |
| Switzerland | 45% | October 2025 | Multilingual FR/DE/IT |
Prof. Mireille Hildebrandt, digital law expert at the Vrije Universiteit Brussel, provides context:
"The Digital Markets Act imposes transparency obligations that Google must comply with for its AI Overviews. European restrictions, far from being a hindrance, ensure that cited sources are more clearly identified — which is an opportunity for well-optimised businesses."
5. What the data tells us for strategy
The above statistics allow us to draw 5 strategic lessons:
- Coverage will continue to increase. At +5 points per quarter, AI Overviews will cover 60% of informational queries by end of 2026. Adaptation is not optional.
- Being cited in the AI Overview is a massive advantage. +22% CTR and +340% impressions. It is the new "position 0".
- Informational sectors are most impacted. Health, tech, finance and legal must urgently pivot towards AEO.
- The French-speaking market is fully concerned. 46% coverage in France, 43% in Belgium — French-speaking businesses can no longer ignore the phenomenon.
- Dual snippets + AI Overview optimisation maximises chances. The same content often feeds both formats.
Chart: AI Overviews deployment projection in Europe (2026-2027)
6. FAQ — AI Overviews statistics
Will AI Overviews cover 100% of queries?
No. Transactional, navigational and specific local queries will remain largely unaffected. Google's target appears to be informational queries, where the rate should reach 65-75% by end of 2026.
Are the statistics reliable?
The cited data comes from Sistrix, Sparktoro Europe and Statista — three recognised sources in the European SEO industry. They are based on samples of 10 to 50 million queries.
Is the CTR impact the same for all business sizes?
Large well-known brands suffer less because they capture brand queries (navigational). SMEs and content sites are most impacted on generic informational queries.
Will Google share revenue with cited sites?
Not at the moment. The European Digital Markets Act could impose compensation obligations, but no concrete measures are in place to date. The debate is ongoing in the European Parliament.
Can you opt out of AI Overviews?
Google does not provide a meta-tag to specifically exclude your pages from AI Overviews. You can block Google-Extended (the AI bot), but this will also exclude you from Gemini and could impact your classic SEO.
How do AI Overviews compare to Perplexity?
Perplexity cites more sources (5-10) and provides more visible clickable links. Google's AI Overviews cite fewer sources (3-4) but reach a much larger audience. Both formats are complementary in an AI visibility strategy.
Conclusion: the data does not lie
The figures are unambiguous: AI Overviews are transforming the European SEO landscape. Companies that adapt now capture a measurable competitive advantage. Those that wait will see their traffic erode quarter after quarter.
AISOS provides detailed audits of the AI Overview impact on your sector, with actionable recommendations. Contact us to assess your exposure.
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