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Why Is the Stock Market Down Today, 4/20/26?

Story Highlights
  • The S&P 500 and the Nasdaq 100 are in the red amid U.S.-Iran peace talks uncertainty.
  • Hormuz tensions flared following a series of clashes over the weekend.
Why Is the Stock Market Down Today, 4/20/26?

The S&P 500 (SPX) and the Nasdaq 100 (NDX) are in negative territory on Monday, although both indexes are trading above their intraday lows.

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Uncertainty surrounding the next round of U.S.-Iran peace talks ahead of the Tuesday-evening ceasefire deadline has weighed on sentiment and kept investors cautious. While Vice President J.D. Vance is scheduled to depart for Pakistan on Tuesday, Iran has not yet confirmed its participation in the negotiations.

Hormuz Tensions Escalate amid U.S.-Iran Ceasefire Violation Accusations

Both sides have accused each other of ceasefire violations amid rising tensions in the Strait of Hormuz. Over the weekend, the Iranian Revolutionary Guard Corps fired on two Indian-flagged ships in the waterway, while the U.S. attacked and seized an Iranian vessel, accusing it of violating an ongoing naval blockade of ships entering and exiting Iranian ports.

Trump has warned that the U.S. will strike Iran’s energy infrastructure and bridges if the two sides are unable to reach a deal. Tensions remain high as investors weigh the risk of further escalation.

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