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Illustration: Aïda Amer/Axios

The stock market's sell signals keep mounting but the prices keep rising, leaving investors wondering just what comes next.

What's happening: Signs of euphoria abound, suggesting the market is getting overheated — a classic sell sign. But in a market underpinned by the Federal Reserve's limitless money printer, dip buyers have continued to step in and markets are piling on risk.

By the numbers: The S&P 500 has risen 87% since its low on March 23, 2020, adding $50 trillion worth of value to the index in just over a year, the best 12-month rally since the 1930s.

  • Investors have continued to lever up to plow money into the stock market, borrowing a record $823 billion against their portfolios as of March, according to data from the Financial Industry Regulatory Authority.
  • That's a more than 72% year-over-year increase.
  • The numbers have continued to climb further above January's record of $799 billion.

Where it stands: At the beginning of April, the amount of money that had flowed to stocks globally over the past five months had exceeded the inflow seen over the prior 12 years by well over $100 billion, according to data from Bank of America Global Research.

The big picture: The sea change in psychology means more investors are making increasingly risky bets and putting more of their money into stocks.

  • Retail traders also are growing their influence in the market, another classic sign a bubble is about to pop.
  • Mom and pop traders now account for almost as much trading as all hedge funds and mutual funds combined, FT reports.

Watch this space: Institutional investors, company insiders and hedge funds are all starting to sell.

  • BofA's data show last week its clients had the largest outflows in five months and the fifth-largest on record. Retail clients were the only net buyers.
  • The ratio of company insiders, like CEOs and other top executives, who are selling versus buying stock in their companies is hitting extreme levels, as the insiders unload positions.

Yes, but: Selling has proved to be 2021's riskiest wager, Bloomberg notes. The S&P 500 has yet to decline by more than 5% this year and has now gone 211 days without such a decline, per Reuters.

  • Excluding the S&P's five best sessions, the index’s 11% year-to-date gain has been only 2%.
  • That's highly unusual: The S&P 500 has declined at least 5% every 177 calendar days, Sam Stovall, chief investment strategist at CFRA, told Reuters.

The bottom line: "To try to guess that this is the right time to be out of the market, you may as well go to Las Vegas," Mark Stoeckle, chief executive at Adams Funds, told Bloomberg. "Here’s just as much risk doing that."

Go deeper

11 mins ago - Health

CDC: Vaccinated people should get tested after exposure even if they show no symptoms

A person gets a COVID-19 test outside The Late Show with Stephen Colbert at the Ed Sullivan Theater in New York City. Photo: Noam Galai/Getty Images

The Centers for Disease Control and Prevention has revised its COVID-19 testing guidance for fully vaccinated people, recommending tests after exposure even if they don't show any symptoms.

Flashback: The agency previously said that fully vaccinated people did not need tests after coming into contact with an infected person unless they experienced symptoms.

Ubisoft workers demand company accountability in open letter

Photo: Frederic Brown / Getty Images

Close to 500 current and former employees of “Assassin’s Creed” publisher Ubisoft are standing in solidarity with protesting game developers at Activision Blizzard with a letter that criticizes their company's handling of sexual misconduct.

Why it matters: Ubisoft and Activision Blizzard workers are framing the actions as part of a bigger movement meant to have lasting change in the industry and its culture.

Heat dome roasts Northwest, Central states as "derecho" threat looms in Midwest

Weather map showing a sprawling heat dome centered over Kansas on July 30, 2021. (WeatherBell.com)

The latest in a series of relentless heat waves is bringing dangerously hot temperatures to a the Central U.S. on Wednesday, and will contribute to a severe thunderstorm outbreak across the Upper Midwest. The heat will expand in scope toward the end of the week.

The big picture: Heat watches, warnings and advisories are in effect across 19 states, from Portland, Oregon east to Minneapolis, and running all the way south to New Orleans. Temperatures of between 10°F and 15°F above average in these areas along with high humidity poses a public health threat.