IS

Ironsource Ltd

A maker of software that helps mobile app and game developers earn money and find new players. Its tools handle ad mediation, rewarded videos, and user acquisition for apps across the app economy. Founded in Tel Aviv in 2010 by seven entrepreneurs, it grew partly by merging with the mobile ad firm Supersonic in 2015. A fun detail: the founders have never publicly explained the name, though it suggests an "iron-clad source" of app revenue.