Global equity markets faced downward pressure in September 2026 as government bond yields surged to multi-decade highs and oil prices climbed amid escalating Middle East tensions. Persistent inflation pressures prompted major central banks to enact tighter monetary policy, weighing heavily on broader sectors like real estate, utilities, and small-cap stocks. Despite this macro headwind, resilient corporate profits and strong demand for artificial intelligence infrastructure kept large-cap tech growth indexes relatively supported.
The S&P 500 declined 0.5% in September as rising Treasury yields and tighter monetary policy weighed on equity valuations. Persistent inflationary pressures and higher energy prices contributed to a more cautious outlook, although continued strength in artificial intelligence-related and large-cap technology stocks helped limit the index’s decline amid broader market weakness.
The FTSE 100 declined 2.0% during September as higher energy prices intensified inflation concerns and pushed UK government bond yields higher. Expectations that the Bank of England may need to maintain tighter monetary policy weighed on investor sentiment, while gains among the index’s major energy companies BP & Shell weren’t enough to offset the downward pressure on other sectors.
Japan's Nikkei 225 rose 0.7% during the month, with a late-September rally led by AI and semiconductor-related technology companies helping keep the index above 66,000. This was despite the Bank of Japan lifting interest rates to a 31-year high, as investors interpreted the 7-2 split vote as a sign the central bank will be less aggressive in the short-term. Meanwhile, the yen continued to weaken against the US dollar, supporting the index heavyweights that rely on export demand.
The Australian All Ordinaries Index mirrored its global counterparts and declined 3.3% during September, with interest rate, inflation, and geopolitical concerns putting pressure on multiple sectors. Lower commodity prices, including gold, lithium, and iron ore, meant that Australian mining companies felt persistent pressure throughout the month, while the real estate sector felt the impact of higher interest rate expectations. The WA Index underperformed the broader market, falling by 5.2% due to its high exposure to major mining companies.