Fed — Distribution of Household Wealth in the U.S. since 1989

In 1989, the top 1% owned 4.81 % of household wealth and the bottom 50% held 0.76%. 

In Q3 2020 (latest), the top 1% owned 36.18% and the bottom 50% owned 2.36%

The middle is shrinking relatively to the top. The bottom 50% is "doing much better." (snark)

Federal Reserve Board of Governors
Distributional Financial Accounts
Distribution of Household Wealth in the U.S. since 1989

See also

Strategic Culture Foundation
America’s Richest 1% Owned 5% in 1990, Own 36% Today

Eric Zuesse