Retail Investors Just Made a Historic Move Into U.S. Stocks

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Looking for signs of exuberance that typically signal a market top? How about mom and pop backing up the SUV at the local brokerage.

Clients at TD Ameritrade added to stock holdings for a 10th straight month in November, driving a gauge of retail investor sentiment 15 percent higher to a recordBloomberg Terminal, according to the online brokerage’s website. That was the “largest single-month increase ever” in the firm’s IMX measure, as investors piled into an equity market that’s on pace for its best year since 2013.