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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."

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The CDC announced in new guidance Thursday that anyone who is fully vaccinated can participate in indoor and outdoor activities without wearing a mask or physically distancing, regardless of crowd size.

What they're saying: "If you are fully vaccinated, you are protected, and you can start doing the things that you stopped doing because of the pandemic," CDC Director Rochelle Walensky will say at a White House press briefing.

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Colonial Pipeline paid hackers linked to the DarkSide cybercrime group nearly $5 million in cryptocurrency after last week's ransomware attack, Bloomberg first reported and the New York Times confirmed.

Why it matters: The breach of the largest refined fuels pipeline in the U.S. triggered new concerns about the vulnerability of the country's increasingly digitized energy systems.

Biden warns gas stations not to price gouge: "That's not who we are"

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President Biden on Thursday warned gas companies to not price gouge amid major shortages following the Colonial Pipeline cyberattack.

The big picture: Biden added that the FBI does not believe the Russian government is behind the attack, but they do know that those responsible "are living in Russia."