US equity markets closed lower on Monday, with the Dow Jones Industrial Average posting the steepest losses as investors continued to price in geopolitical uncertainty.

The blue-chip index fell 0.59% to 51,839.26 points, while the S&P 500 also retreated, reflecting a broad-based risk-off sentiment across US equities.

The sell-off marks a continuation of the pressure that has defined the week, following a similar decline on Wednesday when markets reacted to the collapse of a provisional agreement aimed at ending the conflict between the United States and Iran.

President Donald Trump’s announcement that the deal had fallen through triggered a sharp repricing of risk, with the Dow Jones Industrial Average declining as investors digested the implications of renewed hostilities.

Persistent geopolitical risks are now acting as a drag on equity valuations, with the Dow Jones showing particular vulnerability to headlines regarding the Iran situation.

The market’s reaction underscores the sensitivity of US equities to diplomatic breakdowns, as the absence of a clear resolution path keeps the risk premium elevated.