Integral Ad Science is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
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Silverpop is leading in Business & Industry, People & Society, Shopping, Death and 65 other categories.
Integral Ad Science is leading in most countries, including United Kingdom, France, Canada, Poland and 59 other countries.
Silverpop is leading in United States, Australia, Czech Republic, Ireland and 15 other countries.