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A version of this article first appeared in CNBC’s Inside Wealth newsletter with Robert Frank, a weekly guide to the high-net-worth investor and consumer. Sign up to receive future editions, straight to your inbox. The U.S. now accounts for more than a third of the world’s millionaires and billionaires, as tech companies and startups mint ever larger fortunes. The U.S. has more than 6 million liquid millionaires, or those with investable assets of more than $1 million, up 78% over the past decade, according to a report from Henley & Partners and New World Wealth. They account for 37% of…

Exchange-traded funds have amassed trillions of dollars by offering investors greater tax efficiency, liquidity and lower costs than mutual funds. Now, a looming regulatory shift is poised to bring the two vehicles closer together — and threatens to complicate the very features that fueled the ETF boom.The Securities and Exchange Commission is expected to approve applications for dual-share-class structures, perhaps as soon as this summer, allowing managers to add an ETF sleeve to an existing mutual fund. More than 50 firms, including BlackRock Inc. and State Street Corp., are waiting for the regulator’s greenlight to deploy the hybrid structure —…