Some other interesting stats for context:

* About 87% of adults with a household income of $100,000 or more own stock; compared to just 28% of those earning under $50,000.

* Only about 37% of adults hold stocks, bonds, or funds outside of a retirement account.

* Between 55% and 60% of Americans live paycheck to paycheck and are one large expense or missed paycheck away from homelessness.

* While some paycheck-to-paycheck workers technically own small amounts of stock, the actual value they hold is minimal.

* The wealthiest 10% of Americans own roughly 90% to 95% of all U.S. stock value.