Ad tech companies are cropping up all over the show; it’s proving quite difficult to keep up with them all. But according to the 2014 Tech Track 100 [an annual league table of Britain’s fastest-growing private tech businesses] advertising and marketing companies now make up a fifth of the country’s fastest-growing private tech, telecoms and digital media companies.

That’s quite a sizeable chunk but if you compare it with the 2008 league table, in which there were just six companies representing the ad-serving sector, that’s more than tripled!

Have a look at the full list of the UK’s 100 fastest-growing private tech, telecoms and digital media companies below and see if you can spot the ad tech companies. You might want to keep an eye on these guys…