According to Nielsen//NetRatings data, the following advertisers purchase the largest amount of ad impressions on Google:
- eBay – 984.2 mln impressions in January 2006
- Shopping.com – 447.59 mln
- Local.com – 279.25 mln
- Target – 218.14 mln
- Expedia – 197.33 mln
The following advertisers bought the largest amount of impressions on Yahoo! search engine.
- eBay – 537 mln impressions in January 2006
- Shopping.com – 501.2 mln
- University of Phoenix – 151.64 mln
- LengingTree – 116.3 mln
- Target – 79 mln.