Many top-based companies fully depend only on SEO to operate their main operation. The top-ranked companies that fully depend on SEO are in order of their ranking in ascending order. First comes Growth Hackers, which rank no 1, next comes Page Traffic, RankZ, Indeed SEO, FoxyMoron, Rank Higher, SEO experts company India, ROI minds, EZ rankings, eSearch Logix. We have to rely on search engines completely. There are different search engines like Google, Bing, Yahoo, etc.