The optimism that briefly lifted Wall Street on Tuesday morning dissipated by the closing bell, as the delicate machinery of international diplomacy weighed on investor confidence. Despite an early attempt to push the S&P 500 toward new record highs, the market succumbed to a late-day retreat. The S&P 500 and Nasdaq Composite both fell 0.63%, while the Dow Jones Industrial Average dropped 0.59%, or approximately 293 points, reflecting a growing skepticism over the stability of U.S.-Iran relations.

The shift in mood was driven by reports of a deadlock in negotiations. Signals of an impasse grew as Iranian officials reportedly declined to participate in scheduled talks, and Vice President JD Vance postponed a planned trip to Pakistan. These developments suggested that the diplomatic channels between Washington and Tehran were more obstructed than market participants had initially priced in, causing a spike in oil-related tensions and a swift reversal of the day’s earlier gains.

In a characteristic twist of timing, Donald Trump announced an extension of the ceasefire shortly after the markets closed. While the move provided the very clarity investors had been seeking, it arrived too late to salvage the session. This disconnect highlights the current market’s extreme sensitivity to geopolitical noise—a landscape where the interval between a diplomatic breakdown and a policy reprieve is often measured in minutes, yet carries the weight of billions in shifted value.

With reporting from InfoMoney.

Source · InfoMoney