In March 2026, the addition of 434,661 new ads.txt lines and the removal of 432,089 existing lines resulted in a net increase of around 2.5k+ lines, indicating a relatively balanced level of activity this month. Both direct and reseller entries saw steady updates, reflecting ongoing maintenance and gradual supply adjustments across publisher inventories.
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 lines.
- Onetag emerged as the strongest contributor this month, driven by increased adoption of its AI-powered curation and real-time optimisation tools, particularly across low-traffic publishers. Media.net and Sharethrough followed with notable gains, supported by steady publisher adoption and continued demand engagement across traffic tiers.
- Smile Wanted and Amazon Ads also recorded solid increases, reflecting ongoing expansion of authorised supply and broader publisher integrations. Overall, this month’s rankings highlight continued momentum from SSPs strengthening their presence across low- and mid-traffic inventory while maintaining stability among high-traffic publishers.
Want to know more? Please download the full report for a detailed breakdown.
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