On Wednesday SEMrush priced their IPO at $14 a share & listed Thursday. There have been many marketing and online advertising companies which are publicly traded, but few that were so focused specifically on SEO while having a sizeable market cap. According to this SeekingAlpha post at the IPO price SEMrush had a valuation of about $1.95 to $1.99 billion. For comparison sake, here are some other companies & valuations. Facebook acquired Instagram for $1 billion. Google acquired YouTube for $1.65 billion. Yelp trades at around a $2.9 billion market cap. Yahoo! was acquired by Verizon for $4.48 billion. Hubspot has a market cap of around $20.4 billion. A couple years ago Gannett bought AdWords reseller WordStream . A few years before that they bought ReachLocal . The Hearst publishing empire also bought iCrossing long ago. Marin Software remains publicly traded, but they are only valued at about $20 million. Newspapers reselling Google AdWords ads isn't really SEO though.…