> [edit] Found the source numbers:
> 50-90% https://fred.stlouisfed.org/series/WFRBSN40172
> 90-99% https://fred.stlouisfed.org/series/WFRBSN09145
> 99-99.9% https://fred.stlouisfed.org/series/WFRBS99T999258
This is the series I think you want.
Share of Corporate Equities and Mutual Fund Shares
If 93% of stock market wealth help by the wealthiest 10% represents $10k, that means something really different than if it represents $1m. Comparing percentages can be really confusing, particularly when talking about wealth.
Assuming Us has round 300k population.
My understanding: lets say whole market is worth 1Gz, i.e. sum(share*sharePirce) over (all shares in all companies) is 1 gadzilion, so 10% of population (30k) combined own 0.93 gadzilion. While the rest (270k), share 0.07 Gz of market.
on avg per person 0.93/30=0.031Gz 0.07/270=0.00025Gz
(On average, poorer 9 deciles are poorer by a factor of two)
Top 1%: 40% to 54% -> +14%
Top 10%: 77% to 93% -> +16%
Top 10% minus the top 1%: 37% to 39% -> +2%
Essentially this was all the top 1% and the rest of the 10%ers barely budged in ownership percent. I'd be curious to see the results for top 0.1% and 0.01% as well.