I feel like this chart tells a pretty clear story about where all our affordability issues are coming from.
I also suspect if the top quintile were separated out into it's own graph of this nature, it would probably have a similar look where the majority of the wealth held by that 20% is held by the top few percent of the group.
According to the article it's Q3 2023. From what I can tell the data is drawn from here, which is sourced from the National Balance Sheet Accounts which are updated quarterly.