US Market Crash: Warning or False Alarm?

Have you noticed ‘trendy’ news prints appearing rather frequent recently ?

Below is one such posts. (see below)

It piqued my interest because it concerns the US stock market that I am vested in.

So, here’s what I have found and sharing.

Updated market commentary

A major correction in the US composite indexes remains a credible risk, but it is not a confirmed or inevitable outcome yet.

Since 01 Sep 2026, the warning signals have become more numerous:

• Elevated valuations,

• Deteriorating market breadth.

• Rising Treasury yields.

• Oil above US$100 a barrel.

• A more hawkish Federal Reserve.

• Narrow AI-led leadership.

However, strong earnings expectations and continued demand for large technology companies have (so far) prevented a broad market breakdown.

The long-term backdrop is unusually strong:

• The $S&P 500(.SPX)$ has risen more than +13% in 2026 and more than +19% over the past six months. (see above)

• Over the 10 years to 18 Sep 2026, it generated a +321% total return.

• For example, a US$10,000 investment in an ETF tracking the index in September 2016 would have grown to approx. US$42,100.

• The decade-long performance is exceptional, but it also means investors should not assume that the next decade will replicate the last one.

Increased warnings activity

Why correction warnings increased ?

1. Market’s internal breadth is Weak

The most important new warning comes from the market’s internal breadth, not from the headline index levels.

On Mon, 21 Sep 2026, $NASDAQ(.IXIC)$ surged about +2.0% to a record close, while S&P 500 jumped roughly +1.5% and finished less than 1.0% below a new high.

Yet thirty of S&P 500 stocks fell to new 52-week lows, and only seven reached new 52-week highs.

Above combination is exceptionally rare.

According to SentimenTrader, Founder, Jason Goepfert :

• The last time S&P 500 gained at least 1.0%, moved within 1% of a new 52-week high and recorded more new lows than new highs was backed in 21 Dec 1999.

• It was several months before the dot-com bubble peak.

• Before that, the only other identified occurrence was 23 Jul 1929.

Ok, the comparison with 1999 and 1929 is attention-grabbing, but it is not a standalone sell signal.

The historical sample is only 2 observations, and neither episode provides a reliable timetable for what happens next.

It is better interpreted as evidence that the market’s advance is unusually narrow and internally fragile.

2. Leadership is concentrated in a small group of sectors

The divergence is partly explained by where the S&P 500’s gains came from.

CNBC reported that communication services, information technology and consumer discretionary led Monday’s advance.

Information technology was less than 1.0% below a new 52-week high, but communication services and consumer discretionary remained approx. 4.0% & 7.0% below their respective highs.

B. Riley Weath, Chief market strategist, Art Hogan argued:

• Stocks already under pressure have an easier path to registering new lows than the leading technology shares have to establish new highs.

• In other words, a small number of powerful leaders can lift the index even while a wider group of constituents continues to deteriorate.

This explains why the index can appear healthy while many individual investors experience a weaker market.

The capitalization-weighted S&P 500 gives greater influence to the largest companies, so strength in a handful of mega-cap technology and communication-services stocks can mask weakness elsewhere.

3. Valuations are historically stretched

The Shiller cyclically adjusted price-to-earnings ratio, or CAPE, was around 41 in September 2026, up approx. +55% over 10 years and close to levels seen only during the dot-com era. (see below)

It reached more than 44 in late 1999, while the long-run average is approx. 17.4.

Readings above 40 have historically been extremely rare and have generally been associated with poor subsequent decade-long returns.

The CAPE ratio compares the inflation-adjusted value of the S&P 500 with average inflation-adjusted earnings over the preceding 10 years.

It is useful because it reduces the effect of a single year of unusually high or low profits.

Nevertheless, it is primarily a long-term valuation indicator, not a precise short-term market-timing tool.

Historical data cited in the recent commentary suggest that whenever the CAPE ratio has been above 40, the S&P 500 subsequently produced a negative annualized total return over the following decade.

It is a significant warning for long-term return expectations, but it does not establish that the market must immediately fall.

The result is also heavily influenced by the period following the dot-com bubble.

A high CAPE ratio can remain elevated for years while the market continues to rise.

4. Bond yields & Oil - pressuring valuations.

For a brief moment, the 10-year Treasury yield briefly moved above 5%, its highest level since 2007, and crude oil rose above US$100 a barrel. (see below)

Latest - as of 23 Sep 2026 Asia time

Higher yields increase the discount rate applied to future corporate earnings, which is particularly negative for long-duration growth and technology stocks.

Higher oil prices also raise the risk that inflation remains persistent and restricts Federal Reserve’s ability to ease policy.

This explains why the market reacted negatively on 8–10 Sep 2026:

• The S&P 500 fell -0.58% on 8 Sep 2026 and -0.48% on 9 Sep 2026.

• While Nasdaq declined -0.32% and -0.64%, respectively.

5. US Fed - the direct headwind.

On 16 Sep 2026, US Fed raised its policy rate by 25 basis points to a target range of 3.75% – 4.00%, its first rate increase since 2023.

The decision was unanimous, with policymakers indicating that another increase could be appropriate before year-end.

The Fed also raised its inflation projections.

It now expects headline PCE inflation of 3.7% and core PCE inflation of 3.4% this year, while not expecting inflation to return fully to its 2% target until 2029.

That is an uncomfortable backdrop for equities.

Investors have been willing to pay high valuations because of strong earnings growth and optimism about AI.

However, if interest rates remain higher for longer, the valuation multiple attached to those earnings becomes more vulnerable.

What market has actually done

The recent price action has been volatile but not characteristic of panic yet. (see below)

The 21 Sep 2026 rally was supported by a sharp move in AI-related stocks:

• $Meta Platforms, Inc.(META)$ rose more than +11.3%.

• $Intel(INTC)$ gained +12.24%.

• AMD advanced roughly +10% and so on.

At the same time,

• West Texas Intermediate (WTI) crude fell -4.5% to $95.78 a barrel.

• Brent crude declined more than -3.0% to US$100.34.

• US 10-year Treasury yield fell more than 4 basis points to 4.951%.

Above details show why the indexes rallied — lower oil prices & lower bond yields temporarily eased the macroeconomic pressure, while AI stocks revived investor enthusiasm.

However, that also reinforce the market’s dependence on a narrow group of technology leaders and on favourable movements in yields and energy prices.

Reuters described the market as showing “no sign of panic” noting that the S&P 500 remained less than 3% below its 13 Aug 2026 record even as Treasury yields rose sharply.

That distinction matters.

A correction usually refers to a decline of at least -10% from a recent high.

Data available through 22 Sep 2026 show a market under pressure and vulnerable to a correction, but not one that has already entered a confirmed -10% drawdown.

Premature Warnings ?

There are still important supports for equities.

(1) Corporate earnings remain strong.

• Reuters reported that Q2 S&P 500 earnings were expected to rise +53% YoY or +49.5% excluding energy, while full-year 2026 profits were projected to increase +35%.

(2) Resilient US economy:

• Solid consumer spending.

• Firm corporate balance sheets.

• Better-than-feared labour-market conditions.

(3) AI to the rescue.

• AI investment cycle continues to support revenue and earnings expectations for major technology, semiconductor and cloud companies.

• Investors have continued to buy market dips rather than engage in indiscriminate selling.

• The strong rebound on 17 Sep 2026 and record Nasdaq close on 21 Sep 2026 illustrate that risk appetite has not disappeared.

There is also an on-going structural argument behind the market’s high valuation.

Dominant technology companies have continued to grow earnings rapidly, while the AI infrastructure build-out has created an additional potential growth driver.

Passive investment funds now control more capital than active funds, creating persistent demand for index constituents regardless of short-term valuation.

These factors may help explain why elevated multiples have not automatically produced an immediate collapse.

However, they cannot eliminate valuation risk:

• If and when earnings growth disappoints or interest rates rise further, passive flows will not necessarily prevent prices from falling.

Geopolitical & Policy risks

The latest CNBC commentary adds an important near-term risk — (a) tensions in the Middle East and (b) possibility of persistently high energy prices.

Art Hogan said the market could see more sessions in which the indexes rise while breadth weakens if investor sentiment remains subdued.

He argued that new highs would be difficult if (1) conflict persists, (2) energy prices remain elevated and (3) US Fed continues raising rates.

This is a critical conditional statement rather than a prediction.

If tensions ease and oil prices fall, inflation expectations and Treasury yields could decline, supporting equity valuations.

Conversely, a renewed energy shock could keep inflation high, force further Fed tightening and expose the market’s valuation excesses.

The US-China summit this week, is another potential source of volatility.

Investors are watching discussions involving (i) AI, (ii) tariffs, (iii) rare-earth materials and (iv) broader trade relationship. (see below)

So far, ‘leaked’ news seemed to point to item #4 discussed in advanced between Bessent and He Lifeng have made strides, the other 3 items are still ‘unknown’.

A positive outcome could support technology and industrial stocks, while renewed trade restrictions could intensify pressure on semiconductors and other globally integrated companies.

Stay invested & Manage expectations

The recent valuation warning should not automatically lead investors to liquidate portfolios and move entirely into cash or bonds.

History shows that valuation concerns were repeatedly prominent during the early and mid-2010s, yet investors who reduced equity exposure too aggressively missed the S&P 500’s exceptional subsequent gains.

The more defensible lesson is not that valuations do not matter, but that attempting to move out before every decline and back in before every rally is extremely difficult.

A long-term investor should distinguish between:

• Short-term risk: The market may experience a -5% to –10% pullback because valuations, yields and breadth are stretched.

• Long-term return risk: A CAPE ratio near 41 suggests that future 10-year returns could be considerably lower than those of the past decade.

• Permanent impairment risk: This would require a deeper deterioration in earnings, employment, credit conditions or financial stability.

The most practical approach is to continue investing with a long-term focus, and avoid assuming that the next decade will replicate the last one.

Investors can remain invested while diversifying across sectors by:

• Maintaining an appropriate equity allocation.

• Holding sufficient liquidity.

• Rebalancing when positions become disproportionately large.

This is different from attempting to forecast the precise day of a market top.

Assessment

The recent articles are not baseless.

They are responding to real warning signs:

• The S&P 500 has produced an exceptional 321% total return over the past decade.

• The CAPE ratio is near 41, close to dot-com-era levels.

• The market’s advance is concentrated in technology, communication services and consumer discretionary.

• Treasury yields, oil prices and Fed policy are creating a less favorable valuation environment.

My viewpoint: (mine only)

• Short-term volatility risk: high.

• Risk of a normal 5%–10% pullback: meaningful.

• Evidence of an imminent crash: insufficient data to support.

• Risk of below-average 10-year returns: materially higher than normal because of the CAPE ratio and the unusually strong performance of the past decade.

• Probability that US market can continue to rise while leadership remains narrow: possible, but increasingly dependent on AI-related earnings and favourable bond-market conditions.

More importantly, I think the key issue is whether deterioration in breadth spreads to the mega-cap technology leaders that currently support the indexes.

In practical terms, current US market warrants less complacency, not an automatic call to exit equities.

The new CNBC evidence strengthens the case for caution because it shows that Monday’s impressive index performance was not broadly supported by individual stocks.

Still it does not prove that a major correction is imminent.

The evidence supports disciplined portfolio management, realistic return expectations and diversification, not a confident prediction that a major correction is about to begin. Agree ?

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