Trading on Wall Street ended Friday's session in negative territory, pulled down by a combination of questions around artificial intelligence spending, an uptick in oil prices, and unresolved uncertainty about the direction of Federal Reserve policy. Selling activity concentrated in technology names drove the Nasdaq Composite down to a weekly loss not recorded since late June.

Equities retreated on the session, with the S&P 500 giving back 1.1% to settle at 7,659.11 and the Dow Jones Industrial Average shedding 0.6% to close at 52,001.52. Trading on the Nasdaq Composite ended with a loss of 2.2%, bringing the index to a closing level of 26,140.03.

Over the five-day trading period, the Nasdaq shed 4.5% of its value and the S&P 500 pulled back 2%, while the Dow posted a 0.7% advance.

Technology-sector equities pulled back as market participants weighed the mounting cost of debt taken on to expand artificial intelligence infrastructure against a broadening field of chipmakers operating out of China. Reports that ChangXin Memory Technologies had advanced its chip programme weighed on valuations throughout the memory sector.

Over the five-day trading period, shares of Micron Technology shed roughly 14.6% of their value, while South Korean chipmakers Samsung Electronics and SK Hynix posted losses of 17.8% and 24.3%, respectively. A weekly loss of 11.4% left the Philadelphia Semiconductor Index at its lowest point in roughly a year, with no single-week retreat since April 2025 running that deep.

Companies providing cloud infrastructure for AI workloads reported their own set of operational setbacks during the period. Shares in both CoreWeave and Nebius retreated 25.2% over the week, with market participants weighing whether the economics underpinning dedicated AI computing ventures can hold up over time.

Remarks delivered by Chair Kevin Warsh at an international economic forum held in Bangkok prompted a recalibration of expectations around Federal Reserve interest rate policy. Warsh kept the question of a potential rate increase at the October 27–28 meeting open, offering no indication of where policymakers stood even as inflation data had come in above forecasts. Trader pricing tracked by CME FedWatch placed the likelihood of a quarter-point rate increase at roughly 17%, down from close to 28% the day before.

Quarterly results from across the corporate landscape landed on both sides of the ledger. Shares of Alcoa climbed 2.6% on the back of third-quarter earnings that cleared analyst forecasts, while Truist Financial also posted stock gains after its own results came in ahead of expectations. Tesla stock retreated 2.1% on the same trading day the company lifted the covers off a rocket-assisted Roadster prototype.

Unrest across the Middle East put pressure on crude oil markets, with analysts noting potential strain on the flow of energy supplies worldwide. Over the five-day trading period, Brent crude posted a 4.7% advance, while West Texas Intermediate climbed a steeper 10.7%.

A proposed diesel supply agreement linking President Donald Trump to Russia drew pushback from legislators across party lines, with observers in financial markets keeping close watch on the developments.