For a read on the bull market, look at who’s buying.

Right now, it’s a dwindling list. With hedge funds, corporate executives and even companies backing away from equities, the post-election rally is increasingly reliant on the little guy. Not everyone thinks he’s enough.

Gains that added almost $3 trillion to share values have awakened the last market skeptics -- look no further than the $128 billion that went into passive funds over the last 12 weeks. It happened as consumer sentiment soared and fund managers dipped into cash piles.

While one buyer is better than none, some pros view interest from small investors skeptically, a warning sign that the eight-year bull market is entering a final phase characterized by euphoria. The market is front-page news and everyone’s looking to cash in on a can’t-miss rally, or so it seems.

“It’s always a concern this far in and at these valuations,” Julian Emanuel, executive director of U.S. equity and strategy at UBS Securities LLC, said in an interview on Bloomberg Television. “That’s part of our call for near-term caution. A lot of new money has come into markets the last couple months.”

Between November and February, the biggest exchange-traded fund tracking the S&P 500 saw $21 billion of inflows, the most for any like stretch since 2014, according to data compiled by Bloomberg.

Of course, retail buying could also be framed positively, and even in its contrarian conception is just one of a handful of concerns among investors facing the eighth year of the bull market. After posting the worst week this year, the S&P 500 is just 2.3 percent below its record on March 1 and valuations are at the highest since the financial crisis.

At the same time, fund manager cash holdings fell to an average 4.8 percent from a 15-year high of 5.8 percent in October, according to a March 21 report by Bank of America Corp.

For some, who’s behind the rally is seen as less relevant than the backdrop of economic data that continues to beat Wall Street expectations.

“While there will be pullbacks and corrections and all the rest, you need a much more general sense of euphoria and signs the economy is approaching a serious slowdown to get a top,” Marshall Front, who oversees $800 million as chief investment officer at Front Barnett Associates LLC in Chicago, said by phone. “Right now you have neither.”

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