Google Analytics collects the information it normally does, as well as the DoubleClick cookie when that cookie is present in relation to display advertising tracking.
https://support.google.com/analytics/answer/2444872
Analytics and Tracking · Advertiser Tracking
Get access to data on 1,115,381 websites Google Analytics with Ad Tracking Customers. We know of 61,650 live websites using Google Analytics with Ad Tracking and an additional 1,053,731 sites that used Google Analytics with Ad Tracking historically and 28,389 websites in the United States.
Google Analytics with Ad Tracking websites that are also using other technologies.
Get a list of 1,115,381 websites using Google Analytics with Ad Tracking which includes location information, hosting data, contact details, 61,650 currently live websites and an additional 113,246 domains that redirect to sites in this list. 1,053,731 sites that used this technology previouslyand 28,389 websites in the United States currently using Google Analytics with Ad Tracking.
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