Top 5 billionaires ≈ bottom 40% of Americans — roughly 135 million people.

(The bottom quarter of households have essentially zero or negative net worth, so most of that $2.2T sits with people in the 25th–40th percentile range. It's an estimate — the Fed doesn't publish fine-grained slices — but 5 people vs ~135 million is about where it evens out.)