Assuming that all of the equities held by the bottom 99% are invested in retirement accounts, it would be 50.1% of the market. [https://www.federalreserve.gov/releases/z1/dataviz/dfa/distribute/table/#quarter:140;series:Corporate%20equities%20and%20mutual%20fund%20shares;demographic:networth;population:all;units:shares]