The Congressional Budget Office compiled family wealth from the Survey of Consumer Finances, Forbes data, the Current Population Survey, and the Financial Accounts of the United States.

Across the 1989 to 2022 period, the report says the top 10 percent share increased from 56 percent to 60 percent and the top 1 percent share rose from 23 percent to 27 percent, indicating a larger wealth gap at the top.

The CBO report summarizes how wealth shares shifted across the distribution from 1989 to 2022.

It states the top 10 percent share increased by 3.7 percentage points while the 51st to 90th percentile share declined by the same amount and the bottom half share changed little, showing concentration rising at the top.

In CBO's distribution tables, the top 10 percent share rises by 3.7 percentage points from 1989 to 2022 when Social Security wealth is included.

When Social Security is excluded, the increase is 5.9 percentage points, showing a larger rise in concentration on marketable-wealth measures.

The Federal Reserve provides an accessible data table for the SCF-based wealth distribution.

In that table, the top 1 percent share rises from 0.26 in 1989 to 0.34 in 2016 and is 0.33 in 2019, showing a larger share for the top 1 percent than in 1989.

The same SCF accessible table lists wealth shares for the bottom 50 percent and the next 40 percent.

It shows the bottom 50 share declining from 0.04 in 1989 to 0.02 in 2019, and the next 40 share declining from 0.34 to 0.27, indicating a shrinking middle share over time.

A World Inequality Database summary of Saez and Zucman's distributional macroeconomic accounts reports top wealth shares for the United States.

It states that the top 10 percent owned 77-78 percent of wealth in 2018, about 10 points higher than 1989, and the top 1 percent owned 38 percent, also about 10 points higher, indicating widening concentration at the top.

The review article reproduces SCF-based distribution tables from Pfeffer and Schoeni (2016) covering 1989 to 2013.

The table shows top 1 percent wealth rising from 29.9 percent to 35.5 percent and top 10 percent rising from 67.0 percent to 75.0 percent, while the bottom 50 percent share falls from 3.0 percent to 1.1 percent, consistent with a widening gap.

In the same SCF-based table, the overall wealth Gini rises from 0.790 in 1989 to 0.850 in 2013.

The ratio of the 95th percentile to the median increases from 14.7 to 23.0, indicating greater dispersion across the distribution and a wider wealth gap.

The Federal Reserve FEDS working paper that introduces the Distributional Financial Accounts provides a first look at the data series that begins in 1989.

The authors report a marked increase in wealth concentration over the last 30 years, consistent with prior studies, indicating the wealth gap has grown over the period covered by the data.