44.4% of domains now fall below accepted quality thresholds, according to Picnic’s Inventory Quality Report 2026, highlighting a growing gap between the scale of digital supply and the value it delivers.

Based on analysis of more than 120,000 domains, the report shows how the rapid expansion of AI-generated content is accelerating low-quality supply across the open web, making it increasingly difficult for advertisers to identify environments that drive meaningful outcomes.

The findings also point to structural inefficiencies in how inventory is currently bought and curated. On average, 34% of domains included on advertiser site lists fail below quality thresholds, while over 90% of high-quality domains are typically absent from advertiser site lists, suggesting that existing approaches are failing to both filter risk and capture value.

To address this, the report releases the PIQ 10 2026 — Picnic’s annual ranking of the domains delivering the most consistently high-quality advertising environments, based on PIQ’s inventory quality signals. 

"The challenge isn’t access to inventory, it’s knowing what’s actually worth paying for. Advertisers are filtering out some risk, but they’re also missing the majority of high-quality inventory. That’s where performance is being lost." Matthew Goldhill, CEO and founder at Picnic. 

Alongside the data, the report identifies three forces reshaping inventory quality for advertisers today:

• AI-generated content flooding supply without adding value
• "Signal washing" masking poor quality through surface-level metrics
• Opaque buying frameworks reducing transparency and control

Together, these dynamics are making it harder for advertisers to distinguish between environments that appear suitable and those that genuinely drive performance.

The report argues that proxy metrics such as CTR and viewability are no longer reliable indicators of quality, as low-quality environments increasingly mimic high-performing signals. Instead, it calls for a shift toward user experience, backed by campaign analysis.

Across multiple verticals, higher-quality inventory consistently delivers stronger engagement, more qualified site visits and improved on-site behaviour – even when headline metrics such as viewability appear similar.

The full findings, including this year’s PIQ 10, are available in the Inventory Quality Report 2026.

Picnic

Picnic is the leader in independent Inventory Intelligence, helping advertisers assess, understand and curate high-quality inventory through the PIQ Data Platform. PIQ scores domains using over 100 signals, from ad density and refresh rates to domain...

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