Wall Street stocks rise on optimism over possible US-Iran deal

LONDON, 27 SEPTEMBER 2026 —

Wall Street closed Friday with the S&P 500 up 0.5% as investors cheered a dip in oil prices sparked by optimism that a United States‑Iran diplomatic breakthrough could soon reopen the Strait of Hormuz.

The prospect of easing the bottleneck that has underpinned recent oil price spikes lifted sentiment enough to keep the broad‑based S&P 500 in positive territory for most of the session.

Analyst Patrick O’Hare of Briefing.com called the Iranian overture “a dubious offer considering Iran hasn't changed its conditions from before,” and warned that “we'll see how long the glow of Iran's offer lasts.” By contrast, Angelo Kourkafas of Edward Jones said there was “some hope for a diplomatic way to the war in the Middle East with oil prices falling a little bit today,” reflecting a more upbeat reading among market participants.

Oil prices fell roughly two percent on the day, a move that helped underpin the equity gains. The price slide was attributed to the market’s tentative belief that a US‑Iran deal could defuse the supply‑risk premium that has been driving crude higher since the Strait of Hormuz was partially blocked earlier in the week. The easing of that risk, however, was set against a backdrop of broader macro‑economic pressures.

Kourkafas noted that “we have a tug‑of‑war between rising interest rates and volatile energy prices against very solid corporate and economic fundamentals.” The comment underscored the dual forces shaping investor sentiment: on the one hand, central banks are tightening monetary policy to combat inflation; on the other, the fundamentals of many listed companies remain.

Inflation concerns were amplified by the lingering threat of further supply disruptions. Houthi attacks on Saudi infrastructure in the Red Sea have kept the risk of additional Gulf oil cuts alive, prompting a rise in government bond yields as investors demanded higher compensation for lending. The benchmark U.S. 10‑year Treasury yield climbed to its highest level since 2007 on Thursday, while Japanese government bond yields also reached multi‑year highs.

In Europe, Bank of England Governor Andrew Bailey hinted that the United Kingdom could follow the European Central Bank and the U.S. Federal Reserve in raising rates in the coming months. Bailey’s comments suggested that policymakers remain focused on curbing inflation even as higher rates could dampen economic growth.

Equity markets also responded to diplomatic developments beyond the Middle East. Dan Coatsworth, head of markets at AJ Bell, said a “seemingly amicable meeting” between President Trump and Chinese President Xi Jinping in Washington lifted investor sentiment. The two leaders discussed the stalled Iran conflict and agreed to meet again at international summits later in the year, first in China and then in the United States.

Despite the positive tone, trade tensions between the United States and China persisted. The two sides extended a trade truce by two months, until January, falling short of the two‑year extension China had sought. MUFG market strategist Lloyd Chan warned that “US‑China trade risks remain… issues over tariffs, agricultural purchases, rare earths, and technology restrictions unresolved,” indicating that the broader geopolitical environment continues to pose headwinds for markets.

The mixed signals from the UN General Assembly, the tentative Iranian proposal, and the ongoing US‑China dialogue created a complex backdrop for investors. While the oil price decline offered a short‑term boost, the underlying volatility in energy markets, rising sovereign yields and unresolved trade frictions suggest that market participants will remain cautious.

Looking ahead, the market’s next test will be whether Iran’s offer translates into concrete action and whether the United States will move toward a formal agreement that can safely reopen the Strait of Hormuz. A successful diplomatic outcome could further ease oil market pressures, potentially supporting equity valuations and stabilising bond yields.

For Malaysian and regional investors, the developments carry particular relevance. Lower oil prices can ease import‑cost pressures for oil‑importing economies, while higher yields in U.S. and Japanese bonds may influence capital flows into the region’s own sovereign debt markets. The ongoing US‑China trade dialogue also matters for regional exporters that rely on both markets for demand.

As the week closes, traders will watch closely for any concrete steps from Tehran and Washington, as well as for further remarks from central bankers in London, Frankfurt and Washington that could shape the trajectory of interest rates and, by extension, equity and bond markets across the Asia‑Pacific.