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The company was founded in 2007 by Or Offer in Tel Aviv, Israel. By 2009, Similarweb won the first Israeli SeedCamp, attracting the attention of international media and investors. The company raised its Series A round of $1.1 million with the investment being led by Yossi Vardi, and Docor International Management. SimilarSites, a browser extension to help users find sites similar to those they are visiting, was launched later that year.
On September 24, 2013, the company closed a Series B round led by David Alliance, Moshe Lichtman with the participation of existing investor Docor International Management.
On February 24, 2014, South Africa media giant Naspers invested $18 million into Similarweb and leading their Series C round. Within a month, Similarweb used a part of the capital for the acquisition of Israeli early-stage company TapDog for a few million dollars in shares and cash, less than a year after TapDog was founded.In November 2014, Similarweb raised $15 million in a Series D investment.In July 2015, Similarweb acquired personalized content discovery platform developer Swayy.In July 2017, the company announced a $47 million round of financing led by Viola Group, Saban Ventures with participation from CE Ventures and existing investors.In May 2021, Similarweb made its public debut on the NYSE at a $1.6B valuation.In October 2021, Similarweb won "Best Alternative data Provider" at Hedgeweek Americas Awards 2021, for their investors intelligence suite.On February 16, 2022, Similarweb reported earnings for Q4 2021, Q4 revenue of $40.2m and Q4 ARR of $165m.