Take a look at this (2015) pic of the landscape: https://www.slideshare.net/Ravi... | Hacker News

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nl on March 7, 2017 | parent | context | favorite | on: Ask HN: Who really gives your personal info to Int...

Take a look at this (2015) pic of the landscape: https://www.slideshare.net/RaviralaKarunakar/luma-display-ad...

The companies you are interested in are in "DMP & Data Aggregators" and "Data Suppliers" section.

But this is only the largest, best known companies. There are many, many more.

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