Mattermark is a startup focused on analyzing private companies. While most of their data is only available via subscription, they’ve got a free daily newsletter that’s worth signing up for – do that here. Today’s newsletter listed the 25 fastest growing companies who’ve raised >$80m in investment capital. Mattermark notes that this is a potential “IPO List” for ~2014. Interesting to see how many on here get talked about in the tech press frequently – and even more interesting to see the ones which don’t have the press halo but seem to be kicking ass.