Back to school: markets brace for September risks

September is anticipated to bring significant market volatility driven by several key factors: escalating concerns over the U.S. Federal Reserve's independence and rate policy following political interference, the potential collapse of the French government and subsequent budget instability risking broader European market contagion, and persistent geopolitical tensions affecting energy markets and global trade tariffs. Concurrently, investors face caution due to historically weak September market performance, record-high equity valuations suggesting complacency, and rising global bond yields signaling unease over public finance sustainability and investor appetite for long-dated debt.

Analysis

September is poised for a significant increase in market volatility as investors return from summer to a landscape fraught with macroeconomic and political risks. In the U.S., political interference with the Federal Reserve, including President Trump's firing of a Fed Governor, has heightened concerns over the central bank's independence and its ability to manage inflation, despite markets pricing an 85% probability of a rate cut at the September 16-17 meeting. Concurrently, Europe faces a critical stress test with a potential no-confidence vote against the French government on September 8, which threatens to destabilize French bonds, whose yields are already near 2011 highs, and could trigger a contagion effect across European markets ahead of sovereign rating reviews. Geopolitical tensions remain elevated, with fading hopes for a resolution in Ukraine pressuring its bonds and creating volatility for Brent crude, while continued tariff angst, marked by new U.S. tariffs on India and uncertainty over China policy, threatens global supply chains. This backdrop of risk is amplified by signs of market complacency, with equity indexes at record highs clashing with September's historically negative seasonality, which has seen the MSCI World Index fall nearly 4% on average since 2020. Finally, unease is growing in sovereign debt markets, with rising government borrowing and upcoming long-dated bond auctions set to test investor appetite amidst record-high yields in Japan and multi-year peaks in Europe.

Key Decisions for Investors

• Investors should consider adopting a more defensive posture for September, given the convergence of significant macroeconomic risks, political instability in the U.S. and Europe, and historically negative market seasonality.
• Monitor the French Prime Minister's confidence vote on September 8 and subsequent credit rating reviews, as a government collapse could trigger a sell-off in European equities and French sovereign debt.
• Be cautious of long-duration government bonds, as upcoming auctions in the U.S., Japan, and Germany will test investor appetite amid already rising yields and concerns over public finance sustainability.
• While geopolitical tensions create volatility for energy markets, they may continue to support European defense stocks, and investors could watch for tactical opportunities in reconstruction-related firms like Holcim should the conflict show signs of de-escalation.
• Given the high uncertainty surrounding the Federal Reserve's independence and future rate path, pay close attention to the August jobs report and Jerome Powell's commentary during the September FOMC meeting for signals on monetary policy direction.