U.S. Trading Week Ending September 25, 2026

Weekly Portfolio Management Brief

1. The Week in One Sentence

The major indexes finished higher, but the market became more demanding underneath the surface: the 10-year Treasury yield moved back above 5%, AI remained the main source of equity leadership, and market participation stayed narrow.

2. Market Environment

Trend: Constructive
Breadth: Narrow / Selective
Risk Appetite: Constructive but concentrated
Rate Pressure: Restrictive / Rising
Economic Momentum: Firm
Geopolitical Risk: Elevated, with renewed diplomatic opening
Earnings Backdrop: Supportive, led by AI-related growth

The headline market remained resilient.

For the week, the S&P 500 gained approximately 1.2% and the Nasdaq rose roughly 2.1%, while the Russell 2000 declined about 0.8%.

That divergence matters.

Large-cap technology and AI-linked companies continued to carry the strongest momentum, while small caps and several rate-sensitive sectors lagged.

The more important macro development was the bond market.

The 10-year Treasury yield began the week below 5%, but stronger economic data pushed it decisively back above that level. By Friday it had briefly reached approximately 5.23% before easing toward the 5.17% area.

The result is an unusual but important combination:

Strong equity indexes alongside a materially higher risk-free rate.

That does not automatically imply that equities must fall.

If economic activity and corporate earnings remain strong enough, stocks can continue to rise even while interest rates remain restrictive.

The important question is whether earnings growth can continue to offset the increasingly demanding discount-rate environment.

Geopolitical risk also remains elevated, but the picture became more nuanced this week.

The U.S. and Iran signaled renewed willingness to pursue negotiations, and talks continued around the United Nations meetings in New York. At the same time, shipping through the Strait of Hormuz remains heavily disrupted and the underlying regional conflict has not been resolved.

That means geopolitical risk has not disappeared, but markets are now weighing a possible diplomatic path alongside the continuing risk of escalation.

3. What Actually Changed

1. The 10-Year Treasury Yield Moved Back Above 5%

This was the most important macro change of the week.

Monday began with a favorable combination for risk assets: oil prices fell and the 10-year Treasury yield moved back below 5%.

That relief did not last.

Stronger U.S. activity data later in the week pushed yields sharply higher, with the 10-year reaching approximately 5.1% on Wednesday and moving as high as roughly 5.23% during Friday's session.

The Federal Reserve had already raised its policy rate by 25 basis points in the previous week, and market pricing continued to reflect the possibility of additional tightening.

The implication for investors is not simply that "higher rates are bad for stocks."

Rates can rise alongside equities when stronger growth and earnings justify higher valuations.

The risk increases when the discount-rate hurdle rises faster than corporate earnings can compensate for it.

That makes the interaction between rates and earnings more important than either variable in isolation.

2. Equity Strength Remained Primarily AI- and Technology-Led

The headline indexes finished the week higher, but sector performance was far from uniform.

Technology was the strongest major area, with Communication Services also among the leaders.

Using the major S&P 500 sector ETFs as a proxy for sector performance, the weekly picture was approximately:

Sector	Weekly Performance
Information Technology	+3.6%
Communication Services	+2.3%
Health Care	+1.8%
Industrials	+0.7%
Materials	+0.1%
Consumer Discretionary	-0.2%
Consumer Staples	-0.2%
Real Estate	-1.5%
Financials	-1.5%
Energy	-3.0%
Utilities	-3.2%

AI optimism remained a major driver of the strongest areas of the market.

This does not mean the market is unhealthy simply because leadership is concentrated.

Narrow leadership can persist for a long time.

But it does mean that investors should distinguish between:

strong indexes

and

broad participation.

Those are currently not the same thing.

3. Bitcoin Passed Its First Major Post-Breakout Stress Test

Bitcoin began the week by breaking above the recent resistance area and moving above approximately $86,000.

More importantly, the move was supported by unusually strong U.S. spot-Bitcoin ETF demand.

The first four sessions of the week produced approximately:

Monday: +$999M
Tuesday: +$715M
Wednesday: +$347M
Thursday: +$191M

The magnitude of the inflows declined after Monday, but the direction remained positive.

Bitcoin then faced a more difficult environment as Treasury yields moved sharply above 5%.

Rather than surrendering the breakout, BTC finished the week around the mid-$80,000 area and remained above the important ~$80,000 breakout zone.

That is constructive.

The next question is no longer whether Bitcoin can break above resistance.

It is whether the breakout can persist if financial conditions remain restrictive and ETF inflows normalize.

4. Renewed Iran Diplomacy Helped Reduce the Immediate Oil Risk Premium

Oil prices fell materially during the week.

Part of that move reflected renewed hopes for diplomatic progress between the U.S. and Iran, alongside some improvement in regional oil flows.

That matters because energy remains one of the clearest transmission channels between geopolitical risk and inflation.

The diplomatic opening does not remove the geopolitical risk.

Traffic through the Strait of Hormuz remains substantially below normal levels, and escalation could quickly return an energy-risk premium to oil prices.

But for this week, the direction was favorable:

geopolitical risk remained elevated while its immediate inflationary transmission through oil eased.

The bond market, however, still moved sharply in the opposite direction.

That distinction is important.

It suggests that the latest rise in Treasury yields cannot be explained only by energy inflation.

Strong economic activity and expectations that monetary policy may need to remain restrictive are also playing an important role.

So while falling oil improves the inflation backdrop at the margin, it does not by itself resolve the higher-rate environment.

4. The Key Tension

Can strong earnings growth — especially in AI — continue to offset a higher risk-free rate and a still-restrictive Fed?

That is the central portfolio-management question coming out of the week.

The current market is demonstrating that equities can continue rising even while interest rates remain high.

There is no mechanical rule that says higher interest rates must immediately produce lower stock prices.

If economic activity remains firm and corporate earnings continue to exceed expectations, stronger fundamentals can offset part of the valuation pressure created by higher discount rates.

AI is currently the clearest example.

Capital continues flowing toward companies viewed as beneficiaries of the AI infrastructure and adoption cycle, even as Treasury yields remain restrictive.

But the hurdle is rising.

If yields remain above 5% while earnings growth slows, valuation pressure becomes harder to ignore.

If earnings continue accelerating, however, the market may be able to absorb a surprisingly restrictive rate environment.

5. Market Conditions

The current environment is best described as constructive but increasingly selective.

The major indexes remain strong.

AI-related earnings expectations remain supportive.

Volatility remains contained.

Bitcoin has held its recent breakout.

Geopolitical risk remains significant, but renewed U.S.–Iran diplomacy has reduced part of the immediate energy-market pressure without resolving the underlying conflict.

There are still several reasons for caution:

the 10-year Treasury yield is above 5%;
the Federal Reserve remains restrictive;
small caps are lagging;
several defensive and rate-sensitive sectors weakened;
and market leadership remains heavily concentrated.

The next major test comes quickly.

On Wednesday, September 30, the Bureau of Economic Analysis will release August Personal Income and Outlays, including the PCE inflation data watched closely by the Federal Reserve.

The same morning also brings the third estimate of second-quarter GDP and updated corporate-profit data.

That makes Wednesday an important cross-asset checkpoint.

A softer inflation report could reduce pressure on Treasury yields and broaden risk appetite.

A stronger inflation reading could reinforce expectations that monetary policy will remain restrictive and make the 5%+ yield environment harder for markets to ignore.

The more useful question is therefore not simply whether PCE is "good" or "bad."

It is:

How does the bond market respond?

6. What to Review in Your Portfolio

Cash

Cash is not simply an inactive allocation. It is portfolio dry powder.

Its value is the flexibility it creates when opportunities appear.

That becomes particularly important in an environment like the current one: Treasury yields are above 5%, market leadership is narrow, geopolitical risks remain unresolved and a major inflation report is approaching.

The objective is not to predict whether markets rise or fall next.

It is to make sure the portfolio has enough liquidity to take advantage of attractive opportunities when they emerge.

As a practical review benchmark, investors may want to evaluate whether roughly 5% or more of the portfolio in Cash or cash equivalents would provide sufficient dry powder for their own strategy, liquidity requirements and portfolio structure.

This is not an automatic allocation rule.

The appropriate Cash level depends on the investor, the portfolio and the opportunities available.

But in an uncertain environment, very low liquidity can become a portfolio-management constraint.

If market stress deepens

If inflation remains firm, Treasury yields move higher and market breadth deteriorates further, sentiment could move toward deeper stress.

In that environment, Cash creates the ability to review selective opportunities gradually where thesis, valuation, portfolio role and position sizing remain attractive.

The important benefit is not simply protection.

It is purchasing flexibility.

Adequate Cash reduces the need to sell another position simply to create liquidity when potentially attractive assets are becoming cheaper.

If risk appetite improves

The opposite scenario also matters.

If inflation improves, Treasury yields ease and participation begins broadening beyond the existing AI leaders, conditions could become increasingly constructive.

Cash remains useful there as well.

It provides capital to evaluate new opportunities without forcing investors to chase the securities that have already produced the strongest gains.

The objective is therefore not to decide today which scenario will occur.

It is to be prepared for both.

Cash is dry powder. Its purpose is to create opportunity when the market creates it.

7. Portfolio Review Questions

Does the current Cash or cash-equivalent position provide enough dry powder if attractive opportunities emerge?

Would the portfolio still have sufficient liquidity if the 10-year Treasury yield remains above 5% and market stress increases?

If inflation improves and market participation broadens, is there enough liquidity to evaluate new opportunities without chasing the existing market leaders?

Would a Cash level around the 5% review benchmark provide greater flexibility, or would that amount be unnecessarily high or low given the portfolio's specific structure and needs?

8. One Action for the Week

Review the portfolio's Cash and cash-equivalent position before Wednesday's PCE release.

Do not make a prediction about the inflation report.

Instead, evaluate whether the portfolio contains enough dry powder to respond intelligently under two very different environments:

deeper market stress that produces selective valuation opportunities;
or improving risk appetite that creates opportunities beyond the current market leaders.

The objective is not to forecast which environment comes next.

The objective is to have the liquidity to take advantage of opportunities when they appear.

9. Starter Workbook

A portfolio becomes easier to manage when every holding — including Cash — has a defined role.

The Proactive Portfolio Starter Workbook helps investors organize holdings by investment intent and portfolio role, making it easier to review concentration, liquidity and the reason each position belongs in the portfolio.

Use it as a starting point for a more structured portfolio-review process.

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