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The booming stock market is making a lot of folks richer, especially those who are already spectacularly rich, finds a report out from consulting firm Capgemini Thursday.

Why it matters: Welp. Even among those who invest in stocks and other kinds of financial assets, there's a wealth divide — and it's growing.

What they found: Last year, for the second year running, the ultra-rich saw bigger gains in wealth than "the millionaires next door," as Capgemini calls them, with lower net worth.