Monthly Market Perspective- September 2026

Throughout September, markets increasingly shifted their focus from energy-related risks toward the sustainability of US public debt and the implications of rising long-term government bond yields.

While previous months had been dominated by geopolitical tensions and energy-market disruptions, investor attention gradually moved toward the ability of the US financial system to absorb growing levels of public debt without destabilising financial conditions.

Against this backdrop, the bond market once again became the primary indicator of investor expectations regarding growth, inflation, monetary policy and fiscal sustainability.

Monetary policy returned to the centre of market attention during the month.

Federal Reserve

The Federal Reserve’s September meeting was the most closely watched event of the month.

The 25-basis-point rate hike reinforced the Fed’s commitment to its 2% inflation target and provided temporary support to the long end of the Treasury curve.

However, investors continue to question whether inflation can be brought back under control without undermining economic growth or conflicting with the financing needs of the US Treasury.

Market expectations regarding future Fed actions remain volatile, contributing to ongoing uncertainty across fixed-income markets.

European Central Bank

In Europe, the ECB continues to pursue a restrictive but gradual monetary-policy stance.

The deterioration in the energy backdrop and inflation that remains above target suggest that the path back to 2% inflation could take longer than previously expected.

Overall, markets continue to price a “higher for longer” rate environment across major developed economies.

One of the most notable developments during September was the gradual shift in market narrative from stagflation toward reflation.

United States

The US economy continues to display stronger-than-expected momentum.

Resilient labour-market conditions, robust investment activity and improving growth indicators have supported expectations for stronger nominal GDP growth.

In this environment, inflation is increasingly viewed not only as a consequence of the energy shock, but also as the result of stronger underlying demand and economic activity.

Europe

Europe continues to exhibit a more moderate growth profile and remains more exposed to geopolitical risks.

Higher energy costs and growing spending requirements related to energy security and defence continue to represent headwinds for the region’s economic outlook.

During September, markets increasingly embraced the view that geopolitical tensions in the Middle East may persist for significantly longer than originally expected.

The broadening of tensions in the Red Sea region, growing concerns regarding critical energy infrastructure and the involvement of additional regional actors have reduced the probability of a rapid normalisation in energy prices.

Investors are increasingly considering a scenario in which:

• oil prices remain structurally above pre-crisis levels;
• inflation remains persistently elevated;
• central banks require a longer period to achieve their inflation objectives.

The perception of a temporary energy shock is gradually being replaced by expectations of more persistent inflationary pressures.

The divergence between equity and bond markets remained one of the defining features of the month.

Fixed Income

Bond markets continued to face significant pressure.

Higher yields reflected a combination of factors, including:

• elevated fiscal deficits;
• persistent inflation;
• rising risk premia;
• concerns about long-term fiscal sustainability.

Particular attention remains focused on the psychologically important 5% threshold for the US Treasury market, which many investors view as a critical level for broader financial stability.

Against this backdrop, investor preference continues to favour:

• floating-rate instruments;
• limited duration exposure;
• selective allocations to the long end of the curve.
  

Equity

Equity markets continued to benefit from the resilience of the US economy and the investment-led growth narrative.

Technology spending and ongoing investment in artificial intelligence supported market performance, particularly in the United States.

However, rising bond yields increasingly represent a potential headwind for equity valuations and for sectors that remain highly dependent on the cost of capital.

The sustainability of US public debt emerged as the dominant market theme during September.

Investor attention focused both on the trajectory of the federal deficit and on the measures adopted by the US Treasury to reduce pressure on long-term borrowing costs.

The expansion of Treasury buyback programmes and the increasing reliance on short-term financing were viewed as attempts to contain the average cost of debt issuance.

At the same time, debate intensified around the risk of “fiscal dominance”, a scenario in which government financing requirements exert increasing influence over monetary and financial conditions.

While default concerns remain remote, investors continue to demand higher risk premia, reflecting growing sensitivity to the long-term trajectory of US public finances.

Artificial intelligence remains one of the most important drivers of economic growth and equity-market performance.

Nevertheless, September highlighted growing concerns regarding the sustainability of the current investment cycle.

Rising capital expenditures, increased reliance on debt financing and higher funding costs are fuelling debate about whether future returns on investment can remain comfortably above the cost of capital.

The AI narrative remains supportive, but markets are becoming increasingly selective compared with earlier phases of the cycle.

September confirmed the emergence of a new phase in financial markets, characterised by:

• growing concerns over public-debt sustainability;
• a bond market that continues to drive macroeconomic expectations;
• inflation that appears increasingly persistent and less dependent solely on energy markets;
• resilient US growth supporting a reflationary narrative;
• the combination of elevated deficits, geopolitical uncertainty and strong nominal growth continuing to put upward pressure on long-term yields.

In this environment, portfolio management requires discipline, selectivity and close attention to fiscal policy developments, monetary-policy decisions and the evolution of inflation expectations.