Part of the problem of dealing with reported data. The date of the data collection is always important. Part of the reason I put in the date.
I have taken to trying to include that information more often as it sunk in that some of the data sets used in other places were a bit on the dated side.

In terms of who owns what I believe there is a requirement for companies to report that data for some reason of the regulators. Otherwise we would not be able to find it broken down in such a fashion.