GumGum isĀ  a global technology and media company specializing in contextual intelligence. For more than 10 years, they have pioneered machine learning to extract value from digital content.

In August 2021, Unknown’s portfolio company, JustPremium was acquired by GumGum. JustPremium is the No.1 global marketplace for rich media and high impact advertising, reaching over 250 million unique visitors in more than 25 countries every month. With both organizations joining forces, GumGum becomes the most powerful global advertising solution for a cookieless future through contextual technology and high-impact creatives.


Global/ The Netherlands






New Media


Eric Visser & Harmen Tjaarda

Summary of our venture engine

In our Venture Engine, we create networks of industry leaders alongside a pool of validated solutions and their founders that can make a tangible change in specific domains. Then we ensure that these founders find traction in their market and are able to deliver upon their solution.



JustPremium is acquired by GumGum to merge to form a market leader in contextual rich media advertising


JustPremium is active in 90 locations globally


JustPremium is founded, Unknown Group partners up with them

“We are primed to offer advertisers a cookie-free, attention-grabbing solution that will drive significant benefits for their business both national and international”

Eric Visser

Venturers Involved

Hendrik Halbe
Edward de Jager
Hans Peddemors