Ok, lets do some math. The GDP of the US is $28 trillion. The population of 15 years and above is about 273.85 million. That gives about $102,000 annually per person in this category. The median personal income is about $40,500 annually. So almost 40% of the entire economy goes to wages and other income of normal people alone. And yes, it is median (not average) so we are talking normal people wages, not CEO wages. According to wikipedia, about 17.3% of the GDP is government consumption and 17.2% is capital investment. That leaves little over 25% unaccounted for. This will include everything not accounted above. Charities, rich people wages, lottery winnings, … and of course, stock market gains and dividends.
I can’t account for more of the 25% right now (it is late, maybe someday), but even if it all went to the filthily rich along with a proportional part of government consumption and capital investment, then the normal people still get 61% of the economy. In the absolute worst case. Seems to me like lot of the “ultra-wealthy own most of america” is just misinformation.