The digital marketing software producer's only previous funding had been a $1.4m round four years ago that included e-mail marketing company Caloga.

Hearst and News Corp-backed Roku has filed for a $100m initial public offering on Nasdaq, approximately two months after its flotation plans were first reported.

HowStuffWorks has been spun out from System1, raising $15m in a series A round led by Raine Group.

RTL, which previously took part in a $15m series A has returned for the series B round and was joined by fellow corporate Mediaocean.

The funding round follows a Salesforce-backed $8m series A in July 2016.

Providence Equity Partners has made a majority investment in DoubleVerify, which last raised $33m in 2011 and whose shareholders included Comcast affiliate Genacast.

He had been in charge of DeNA's investment in US market since April 2014 after a year in San Francisco, California, as a senior director.