Macro Snapshot – October 2026

September 2026 Market Trends: Oil, Rates and the Limits of Equity Resilience

September brought the relationship between geopolitics, energy and interest rates into much sharper focus. The conflict involving the US, Israel and Iran has now persisted for seven months and, with meaningful disruption to energy flows through the Strait of Hormuz still unresolved, the market is having to consider the possibility that expensive energy is becoming more than a temporary shock.

Brent rose during September and is now almost 50% higher than a year ago. The immediate effect is visible in fuel and transport costs, but markets are increasingly focused on the second-round consequences: how far higher energy prices feed into wider inflation, whether they begin to influence wage and price-setting behaviour, and how central banks respond if they do.

The answer from policymakers during September was noticeably less accommodating. The US Federal Reserve raised rates for the first time since 2023, the ECB tightened again and the Bank of Japan lifted its policy rate to its highest level since the mid-1990s. The Bank of England held Bank Rate unchanged, but three MPC members voted for an increase.

The important change is therefore not simply that inflation is above target. It is that the distribution of risks around inflation has shifted. Earlier in the cycle, policymakers could reasonably look through an externally generated energy shock if domestic inflation pressures were moderating. That becomes harder if elevated energy prices persist long enough to influence services inflation, wages and expectations. Markets have responded by taking some of the anticipated monetary easing out of the curve and putting a higher price on duration.

Monthly and one-year performance snapshot

Past performance is shown for context only. Returns are measured in sterling and may differ from locally reported market returns because of currency movements and roundings.

The divergence within the September numbers is arguably more interesting than the overall direction of markets.

Most major equity indices weakened, but this was not a uniform retreat from risk. With a notable contrast between the US Small Caps with a sharper 5.4% fall. Against a 1.9% for US technology.

The gap between US Technology and US Small Caps suggests that markets continue to distinguish strongly between companies perceived to have structural earnings support and those more exposed to domestic financing conditions and the cost of capital. AI-related investment remains an important source of capital expenditure and earnings optimism, and that has so far provided large US technology companies with a degree of insulation from the deterioration in the rates backdrop.

Whether that insulation can persist is a more difficult question. Higher sovereign yields ultimately raise the hurdle rate applied to all financial assets. Companies with long-duration earnings streams are theoretically sensitive to that adjustment, but the market has so far been willing to offset the valuation effect with expectations of unusually strong earnings growth from AI infrastructure and adoption. The issue for investors is therefore less whether AI expenditure is real, it clearly is, and more whether the eventual earnings delivered justify the scale of capital currently being committed.

The one-year data also provide useful context. September's weakness therefore sits within what has, for many developed equity markets, still been a strong 12-month period. This is important when interpreting the current risk environment: asset prices have not entered this latest inflation shock from depressed valuations or particularly cautious investor positioning.

Bond markets are asking a harder question

Government bonds were much less resilient than equities in September. US two-year Treasury yields rose 55 basis points during the month, while ten-year yields increased 54 basis points to 5.29%.

The move appears to reflect more than expectations for central-bank policy. Inflation risk, heavy sovereign issuance and weaker fiscal positions are all contributing to a higher term premium. That matters because a rise in yields driven by inflation and fiscal uncertainty has different implications from one driven by stronger real growth.

The UK faces the same pressure, with ten-year gilt yield at around 5.4% by month-end. Ahead of the Budget, higher yields are tightening fiscal headroom, raising financing costs and increasing the importance of gilt-market confidence in shaping policy.

Oil is the shock; persistence is the question

The commodity data reinforce the distinction between an energy-specific shock and a broader commodity boom.

Brent rose c.14% in September and WTI 5.4%, taking their one-year gains to 48.5% and 45.0% respectively. Copper, by contrast, was broadly unchanged during the month despite remaining notably higher over 12 months. Zinc was similarly subdued in September.

If the commodity complex were rising uniformly, the signal might be interpreted as evidence of accelerating global demand. Instead, September's moves appear much more closely related to the supply disruption and geopolitical risk concentrated in energy markets.

Precious metals told another part of the story. Gold and silver fell during September despite the geopolitical backdrop. This is not especially contradictory. Gold may offer diversification in periods of market stress, but it remains sensitive to real yields and the dollar. With sovereign yields rising sharply and the US currency strengthening, the opportunity cost of holding a non-yielding asset also increased.

Equity resilience is becoming narrower

Perhaps the most interesting feature of September was how little of the bond-market adjustment spilled over into the areas of the equity market most closely associated with AI.

That cannot be separated from the scale of capital expenditure now running through the technology ecosystem. Spending on semiconductors, data centres, power infrastructure and AI models is itself contributing to economic activity, while expectations of future productivity gains continue to underpin earnings assumptions for parts of the market.

But there is an increasingly uncomfortable circularity here. The AI investment cycle is helping to keep activity and risk appetite stronger than might otherwise have been expected, while that resilience potentially gives central banks less reason to look through inflation. At the same time, the infrastructure required to support AI is highly capital intensive and therefore not immune to a structurally higher cost of capital.

What matters into the final quarter

The market question entering the final quarter is not simply whether oil rises or falls from here. It is whether the energy shock lasts long enough to alter the inflation regime investors had previously been assuming.

If energy prices normalise relatively quickly, some of the pressure currently embedded in rates could unwind. If they remain elevated, central banks may have to contend with persistent headline inflation at the same time as higher borrowing costs slow underlying activity. The latter would be a more difficult environment for both monetary and fiscal policy.

The implications are likely to appear through dispersion rather than through a simple risk-on/risk-off outcome. Balance-sheet strength, refinancing requirements, operating leverage, pricing power, earnings duration and sensitivity to energy costs may become increasingly important sources of differentiation between managers and portfolios.

The same applies within fixed income. With sovereign curves responding simultaneously to inflation risk, policy expectations, issuance and fiscal credibility, duration exposure alone says less about the underlying risk than it did when central banks were the dominant marginal influence on yields.

That makes the UK Budget particularly relevant. The issue is not simply whether fiscal policy is tighter or looser in aggregate, but whether the package is sufficiently credible to prevent a further fiscal risk premium being embedded in gilts.

In summary

The energy shock is now large enough to complicate the path back towards central-bank inflation targets. Central banks have responded with a more hawkish stance, while sovereign bond markets are also demanding greater compensation for inflation and fiscal uncertainty. The resulting rise in yields is beginning to expose meaningful differences across equity markets rather than producing an indiscriminate sell-off.

AI remains the major counterweight. It continues to support investment, earnings expectations and the parts of the market most closely associated with technological capital expenditure. But the longer the cost of capital remains elevated, the more exacting the test of those earnings assumptions is likely to become.

The useful framework for the final quarter is therefore less about forecasting the next move in any single market and more about watching how three forces interact: the persistence of the energy shock, the extent of second-round inflation and the willingness of sovereign bond investors to finance large government borrowing requirements at current yields.

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Disclaimer: This commentary is for informational purposes only and reflects general market observations. It does not constitute investment advice, a recommendation, or an invitation to engage in any investment activity. Everyone’s situation is different, so if you are unsure about a decision, it’s important to seek guidance from a qualified financial professional.

The views, forecasts and figures included reflect analysis at the time of writing, unless otherwise stated. Sources used are believed to be reliable, but markets and circumstances can change quickly, which means our views may also evolve over time.