Much of this wealth disparity comes from the fact that the top 10% of households own 84% of the stock market, which is up from 77% in the early-2000s.

The majority of middle-class wealth is tied to homes, as more than 60 percent of investible assets are in a primary residence. Stock ownership makes up less than 10 percent of total assets for the middle class. Crashing home values during the last crisis decimated wealth for this cohort, while the very rich have less than 8 percent of their wealth tied up in their primary residence.

http://awealthofcommonsense.com/2018/08/the-3-levels-of-wealth/