S&P 500, Nasdaq Hold 100-Hour MAs After Record Run Stalls

Earlier this week the broader S&P 500, the NASDAQ composite and the NASDAQ 100 each traded and closed at new record levels. Wednesday and Thursday reversed that, with all three closing lower on both days, and the decline carried each index down to its rising 100-hour moving average. Buyers met the indices there. Modest follow-through buying is visible today, and the 100-hour level is now the dividing line traders are watching.

Context — why the 100-hour moving average matters now

This week's setup is a test of a rally that had run to records, not a reversal of a trend that had already broken. The comparable the market is working from is the record-high close set earlier in the week, and the two down days that followed. That is the swing area buyers still need to reclaim for the pullback to read as a pause rather than the start of a correction.

What changed is the trigger. Technology selling on Thursday followed reports that OpenAI revenue disappointed investor expectations, which raised questions about how quickly large AI spending converts into profits. That hit the group carrying the most index weight.

Breadth softened the blow. The Dow and the Russell 2000 edged higher on Thursday while the S&P 500 and the Nasdaq fell. Money rotated away from technology rather than leaving equities.

Earnings remain the underlying support. Strong corporate profit growth and AI investment have kept the broader market near record highs. The open question is whether those earnings keep meeting expectations.

Lower oil has also helped. A sustained retreat would ease pressure on inflation, business costs and consumers, and oil's reversal has already provided some relief. The Middle East backdrop keeps that uncertain.

The macro backdrop stays restrictive. High Treasury yields raise financing costs and make bonds more competitive with stocks, and growth stocks are the most sensitive because much of their valuation rests on future earnings.

Data — what the numbers show

The just-released University of Michigan preliminary October survey gave stocks an uncomfortable combination. Consumer sentiment fell to 46.3 against 47.6 expected and 48.1 previously. Current conditions dropped sharply to 44.7 from 50.9.

Expectations improved even as the headline weakened. The expectations index rose to 47.3 from 46.3, beating the 45.9 forecast.

Inflation expectations moved the wrong way. One-year expectations rose to 4.7% from 4.6%, and five-year expectations increased to 3.5% from 3.4%.

Metric	Previous	Latest	Consensus
Consumer sentiment	48.1	46.3	47.6
Current conditions	50.9	44.7	—
Expectations	46.3	47.3	45.9
1-year inflation exp.	4.6%	4.7%	—
5-year inflation exp.	3.4%	3.5%	—

On the index side, the concrete level is the 100-hour moving average itself. Each of the three indices tested it Thursday and closed lower anyway, which means the close did not confirm the intraday hold. The reclaim level is the old record-high swing area.

Concentration is the other number that matters. The ten largest companies account for roughly 40% of the S&P 500, so weakness in those leaders transmits directly into the index.

Analysis — what it means for markets and sectors

The second-order effect runs through the largest weights first. If the ten biggest names are roughly 40% of the S&P 500, then a technology-led pullback can drag the headline index down even when the Dow and Russell 2000 are rising, which is exactly the split Thursday produced. Rotation inside equities looks different from an exit from equities.

Semiconductors, hyperscalers and the AI infrastructure complex are the most exposed to the OpenAI revenue question, because the spending case for that group rests on AI demand converting into profit. Utilities and energy sit on the other side of the same trade, since data-center power demand is part of the AI buildout case.

Banks and small caps carry less AI valuation risk. The Russell 2000's Thursday gain suggests some of that rotation already happened.

There is a counter-argument worth weighing. Holding a rising 100-hour moving average after two down days is a constructive signal, and the earnings backdrop has not deteriorated. Sentiment surveys are noisy and can overstate weakness in a single month.

The positioning read is straightforward. Buyers defended the 100-hour level Thursday, which puts short-term momentum accounts long above it and gives tactical sellers a defined barometer — bullish above, bearish below. The failed breakouts above the record highs still need repairing before the move reads as more than a corrective bounce.

Outlook — what to watch next

The first catalyst is whether the indices reclaim the old record-high swing areas. A close back above those levels would repair the failed breakout. A close below the 100-hour moving averages would confirm the corrective read.

Oil is the second. A sustained retreat eases the inflation and cost pressure the sentiment survey flagged, while another energy spike would renew inflation concerns and complicate the interest-rate outlook.

The third is the inflation expectations data inside the sentiment survey. One-year expectations at 4.7% and five-year at 3.5% both ticked higher, and persistent inflation could keep interest rates elevated.

Geopolitical headlines can change the mood quickly, and the Middle East backdrop remains uncertain. Price action will settle the battle between the positives and the negatives.

Frequently Asked Questions

What does the 100-hour moving average mean for the S&P 500 right now?

It is the level each of the three major indices tested Thursday and closed lower against. Buyers showed up there intraday, so the level held as support. A close above it keeps the recovery case intact. A close below it hands tactical sellers their signal. The old record-high swing areas remain the level that would confirm the pullback is over.

Why did consumer sentiment fall in the October University of Michigan survey?

The headline index dropped to 46.3 from 48.1, driven by a sharp decline in current conditions to 44.7 from 50.9. Expectations actually improved to 47.3 from 46.3. The mix shows consumers feel pressure in the present while remaining less pessimistic about the future, even as one-year and five-year inflation expectations both edged higher.

Is the AI trade still supporting the market?

Earnings and AI investment have kept the broader market near record highs, so the spending case has not broken. What changed is the question being asked. Reports that OpenAI revenue disappointed investor expectations raised doubts about how fast large AI spending becomes profit, and that hit the technology group carrying the heaviest index weight.

Bottom Line

The 100-hour moving averages held, but the indices still need to reclaim their record-high swing areas to prove this is more than a corrective bounce.

Disclaimer: This article is for informational purposes only and does not constitute investment advice. CFD trading carries high risk of capital loss.