Publicly traded companies are required to disclose revenue, but not required to break it down by source.
Neither Apple or Google break out the revenue from the *Stores (unless they have started doing it very recently). There are third party analytics firms that provide reasonable estimates though[1].
Are all companies which have such stores traded publicly? I don't see a direct connection between these two aspects. For instance, in China there are various Android markets and I'm not sure all of them belong to publicly traded companies.
They do, thats one of those things that companies that are traded publicly are required to do.