30: MFortune (2016)
Mobile casino operator mFortune continues to grow strongly off the back of investment in its in-house content with a 40% rise in revenues to £25m for the year to June 2015, with a pre-tax profit of £9.3m. Its key advantage remains its self-reliance with all game content produced in-house and everything running on its own tech platform, which has led to some larger firms casting an eye over it as a potential acquisition target. It has threatened to move out of its core UK market in previous years, but so far remains content to continue to mine the rich casino seams closer to home.