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The next level of inventory consideration: Sellers and Publishers 500+

The Sellers and Publishers 500+ is a globally scaled inventory marketplace you can use to reach audiences across the best of the open internet. It simplifies the mechanics of reaching your audience by giving you access to tens of thousands of top-quality inventory sources.

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What if you could have the advantages of premium quality while also maintaining scale? What would the impact look like if you could shift energy away from a manual deal setup and toward meaningful optimizations? 

With the Sellers and Publishers 500+, you get an efficient way to buy the most premium inventory on the open internet. Inventory such as global CTV, web, and digital audio is analyzed based on criteria such as the quality of the ad experience and supply path transparency. 

The Sellers and Publishers 500+ comprises tens of thousands of digital destinations globally, including the world’s leading CTV, digital audio, web, live sports and journalism outlets. The lists below provide a sample of leading publishers available when running campaigns in specific countries. While not exhaustive, these country-specific lists showcase the premium quality of the Sellers and Publishers 500+. 

Where you would typically select “open market” on our platform, try selecting the Sellers and Publishers 500+ instead. This omnichannel inventory option gives you access not only to the highest-quality impressions across the open internet, but also to publishers that have historically required one-to-one deals. With it, we empower you to reach audiences wherever they are, while also scaling your budget with peace of mind. 

Get to know the Sellers and Publishers 500+:


Upgrade your targeting technique

If you’re a media buyer tasked with scaling large budgets against narrowly defined audience segments and the brand is sensitive to inventory quality, what do you do? 

Typically, you’ve only had two options: Put together a bunch of private marketplace (PMP) deals and tirelessly troubleshoot to make sure their campaigns are spent in full; or target the open market and constantly filter, exclude, and otherwise control inventory quality across the fragmented marketplace. 

Option 1: Target specific inventory 

  • Advantage: You can prioritize quality based on your known sellers and publishers. 

  • Disadvantage: This method takes more time to set up and manage, while also limiting your scale and decisioning. 

Option 2: Target the open market 

  • Advantage: You can complete a faster setup and gain a wider audience reach. 

  • Disadvantage: You might miss out on the vetting and curation necessary to ensure premium ad placements. 

With Kokai, our upgraded platform, you can gain access to the Sellers and Publishers 500+ as your exclusive third option. 

Learn how you can access quality inventory in just a click.


More advanced filtering

The solution is different from targeting a broad list of contracts or websites. When you use the Sellers and Publishers 500+, our platform evaluates inventory quality, not just at the website or webpage level, but also at the ad-placement level. This means that you can reach your audience on an increased amount of premium inventory that a less-advanced form of filtering could otherwise exclude. 

For example, viewability filters frequently exclude entire websites that fall below your desired average viewability threshold. By leveraging the Sellers and Publishers 500+, you can cherry-pick impressions from such websites, as long as those impressions meet or exceed your threshold, allowing for more scale. 

Graphic: Beyond sites lists: Placement-level filtering

Better quality controls

The Sellers and Publishers 500+ factors in the following criteria for quality assurance. 

  • Placement-level viewability: Finds the most-viewable ad spots on a webpage

  • Ad refresh rate: Avoids pages that refresh ads too quickly

  • Ad load: Prioritizes pages with lower ad loads

  • Direct sellers: Only buys impressions from verified sellers

Note: Media buyers maintain full visibility and reporting capabilities when buying through the Sellers and Publishers 500+. 

Graphic shows four web browsers, each reflecting the buying process through the Sellers and Publishers 500+

Ready to raise the bar on quality? 

Whether you’re torn between PMPs and the open market, or you’ve struggled to scale large budgets against narrowly defined audience segments while also maintaining quality, turning on the Sellers and Publishers 500+ can make balancing scale and curation easier and more efficient. 

Our platform is raising the bar on quality, enabling you to navigate the advertising landscape more effectively while accessing some of the most premium inventory and placements with the click of a button. 

Learn more about the Sellers and Publishers 500+ in this microlesson from The Trade Desk Edge Academy. 

Country-specific Sellers and Publishers 500+ sample lists

Download Sellers and Publishers 500+ sample lists for major advertising markets globally. Each country-specific list highlights examples of premium destinations available in the Sellers and Publishers 500+ within those markets. 

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Sellers and Publishers 500+ - Report