So is this list of distribution only based on the addresses? Or is it based on another method? I could not find it.
Try reading the OP:
The intent of this thread is to find out and update the statistic on how bitcoins as investment/holdings are distributed according to the size of actual holding (note that this differs from the
largest addresses -list).
What the method is, is discussed in the thread. A nice
post of mine, from the day when the figures were last updated, summarizes it.