October was a poor month for the Nasdaq. It was not a poor month for every stock.
That distinction is more important than the headlines suggest.
The Nasdaq Composite fell 5.3 per cent during the month. The Nasdaq-100 lost 6.6 per cent. The S&P 500 declined 0.9 per cent.
Those figures gave investors a familiar story: technology stocks were under pressure, confidence was weakening and the market was losing momentum.
Look beneath the index level and the picture changes.
The equally weighted S&P 500 gained 5 per cent. Mid-cap and small-cap stocks held up far better than the Nasdaq. Nine of the S&P 500's eleven sectors advanced.
Energy led the way, gaining 14 per cent.
This was not a market in which investors abandoned equities indiscriminately.
They changed what they wanted to own.
The problem with the headline index
For years, American equity performance has been heavily influenced by a relatively small number of large technology companies.
That concentration has produced extraordinary returns. It has also made the major indices less representative of the average listed company.
When the largest stocks rise, the index can look strong even while many other businesses struggle.
The reverse is equally true.
A decline in a few heavily weighted companies can pull the headline index lower while a much broader group of stocks performs reasonably well.
October illustrated that second possibility.
The equal-weighted S&P 500 outperformed its conventional market-capitalisation-weighted counterpart by 5.9 percentage points.
Large-cap value stocks also outperformed large-cap growth by 10.5 percentage points.
Those are significant differences.
They suggest investors were not simply reducing risk. They were reassessing where they expected to earn a return.
The earnings were not the whole story
The market rotation was particularly interesting because corporate earnings were not generally weak.
According to FactSet, approximately 60 per cent of S&P 500 companies had reported third-quarter results by 30 October.
The blended earnings growth rate stood at 30.2 per cent year on year, and 82 per cent of reporting companies had beaten analysts' earnings-per-share expectations.
Those figures hardly describe a corporate sector in collapse.
But markets do not pay for yesterday's performance alone.
They assign a value to future earnings, taking account of the capital required to generate them.
That calculation has become more demanding for companies undertaking expensive investment programmes.
Investors have grown less willing to treat every increase in spending as evidence of future profits. They want to know when that spending will produce cash.
It is a reasonable question.
Strong revenue growth is valuable. Strong revenue growth that requires ever-larger amounts of capital may be less attractive than it first appears.
The shift does not mean the market has rejected growth.
It means investors are becoming more selective about the price they will pay for it.
Interest rates remain part of the calculation
Bond markets also changed direction in October.
The US 10-year Treasury yield reached approximately 5.36 per cent earlier in the month before falling towards 4.93 per cent by month-end.
Lower yields can improve the valuation of future corporate earnings, particularly for businesses whose expected profits are concentrated further into the future.
But interest rates do not explain every movement in equity prices.
October's leadership change suggests that investors were considering company fundamentals, valuations and financing requirements alongside monetary conditions.
That is healthier than a market driven almost entirely by expectations of the next Federal Reserve decision.
The central bank matters. It always will.
But companies ultimately have to earn money.
A broader rally is not a guarantee
It would be premature to declare a lasting change in market leadership.
One month cannot establish a durable trend.
Technology companies remain influential, and many continue to generate substantial profits. A sharp decline in their shares can be followed by an equally sharp recovery.
There is also a difference between improving market breadth and an economy entering a new period of strength.
Rising share prices do not remove the risks associated with borrowing costs, slowing demand or weaker employment.
Still, the change deserves respect.
Investors who focus exclusively on the largest technology companies risk overlooking significant movements elsewhere in the market.
The same applies to investors who interpret every decline in the Nasdaq as evidence of a broader financial retreat.
Market breadth tells us whether gains are becoming more widely distributed. It does not predict the future, but it helps reveal what the headline index conceals.
October delivered a useful reminder.
The market is larger than its most famous stocks.
And sometimes the most important development on Wall Street is not what is falling.
It is what has stopped falling, and what investors are beginning to buy instead.
