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Five big tech stocks are worrying investors, as they have gotten a harsh dose of reality over the last few trading sessions. Michael Wursthorn reports for The Wall Street Journal, writing:

The stock marketโ€™s rise this year has narrowed around a short list of big tech companies, a sign of possible weakness heading into 2022.

Five of the biggest stocks in the S&P 500 account for more than half of the broad benchmarkโ€™s gain since April, analysts at Goldman Sachs found. Of the S&P 500โ€™s 22% advance this year, those stocksโ€” Microsoft Corp. MSFT -1.20% , Nvidia Corp. NVDA -0.29% , Apple Inc., AAPL -0.81% Alphabet Inc. GOOG -0.28% and Tesla Inc. TSLA -3.50% โ€”are responsible for around a third.

The dominance of a handful of tech behemoths marks a shift from the more-inclusive run-up that propelled the stock market late last year and in early 2021. Investors appeared to be returning to a favored trade of the past decadeโ€”focusing on a few large, growing, profitable tech companiesโ€”for safety, analysts said, as they contend with a string of anxieties that have sapped confidence.

That has the S&P 500โ€”and the more than $5 trillion that follow it through passive fundsโ€”on precarious footing heading into the new year, several analysts and investors said. โ€œIf those companies, for whatever reason, stop performing, thereโ€™s nothing to support the market,โ€ said Peter Cecchini, director of research at hedge fund Axonic Capital.

Investors have been getting a harsh dose of that reality in recent trading sessions. The S&P 500 fell nearly 2% during the week, as shares of Microsoft, Nvidia, Apple, Alphabet and Tesla all slid at least 4.2%. Losses piled up further Monday, as the broad benchmark slid another 1.1%, with all five big tech stocks closing in the red.

Investors appeared to be trading out of those stocks and shares of other high-growth companies in favor of more defensive holdings, such as consumer staples and utilities, in response to the Federal Reserveโ€™s decision last week to enact a policy pivot to combat runaway inflation and the latest Covid-19 variant. Supply-chain bottlenecks and concerns about the earnings outlook next year, which still calls for solid growth, have compounded investorsโ€™ souring sentiment.

Expectations that stock prices will fall over the next six months jumped to 42% earlier this month, the most bearish reading in more than a year, according to a weekly sentiment survey conducted by the American Association of Individual Investors. The Nasdaq advance-decline lineโ€”which compares the number of securities on the exchange that fall each day with the number that riseโ€”has mostly fallen over the past month, recently hitting its lowest level since November 2020.

Unprofitable growth stocks, the darlings of 2020โ€™s rally, have already been hit, said Vincent Deluard, a global macro strategist at StoneX Group, who has identified more than 300 unprofitable companies that have fallen more than 50% from recent highs.

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