In December 2025, the addition of 456,994 new ads.txt lines and the removal of 398,928 existing lines resulted in a net change of approximately 58.1k + lines, showing an increase from November with an even stronger positive shift this month.
This month we’re excited to welcome ProgrammaticX as a contributing data partner, enhancing visibility into publisher-side supply paths and improving transparent, high-quality insights across mid- and high-traffic domains.
The changes in the ads.txt lines show notable improvements compared to previous months. Here are some top SSPs that have gained a good number of new connections.
- PubMatic and Index Exchange recorded the highest ads.txt growth this month, driven by steady onboarding of new publishers, particularly across mid and low traffic segments. PubMatic’s continued platform enhancements and new strategic partnerships further supported its expanding supply reach and stronger demand connectivity.
- Rubicon and OpenX also posted solid growth, backed by consistent publisher additions and stable market demand, while TripleLift maintained steady adoption across all publisher tiers, reflecting balanced and sustained integration momentum.
Want to know more? Please download the full report for a detailed breakdown.
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