Study Finds GA4 Misattributed 22% of AI Overview Traffic as Direct over 9 Months

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A nine-month first-party study tracking 51,200 AI Overview events for a single brand found that 22.4% of those events were incorrectly attributed to Direct traffic rather than Organic Search in GA4. The research, covering September 2025 to June 2026, suggests standard analytics reporting can undercount the true contribution of AI Overview visibility to organic performance. The monthly misattribution rate was not fixed, ranging from roughly 16.8% to 29.3%, meaning a single aggregate figure should not be used as a universal correction factor. AI Overview traffic accounted for approximately 7.5% of the brand's total organic sessions during the study period. Researchers caution that the custom fragment-based identification method used has limitations and that findings from one brand cannot be broadly generalised across all websites or markets.

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