Private companies have no need or incentive to disclose how profitable they are, highly unlikely that you will get that information.
If what you are trying to do is asses the market size for something for free you may want to try places like the Government`s library
or if you are looking at international markets go back one page
. If you want it spoon fed to you, your best bet would be something like Marketsearch
but they are a tad pricy.