"Jon Stein is putting on a brave face, but the market is turning against the CEO of the largest stand-alone robo-advisor in the country.

"I doubt we'll be the last robo-advisor standing, but it's possible," said Stein, who launched his firm, Betterment, in 2010. "We're building the future of investing, and we've always expected to have lots of competition.

Stein is a trailblazer in the business of low-cost, automated financial advice. A Harvard graduate with an MBA from Columbia, Stein has built Betterment into the fastest-growing robo-advisor in the industry, with $4.4 billion in assets and 160,000 customers."

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