Stock Futures Tumble as Iran Nuclear Standoff Rattles Markets Before Thursday Open

21-May-2026 Blockonomi

Quick Summary

  • Stock futures retreated Thursday morning following Iran’s supreme leader’s decree that enriched uranium cannot be exported, undermining diplomatic progress
  • Dow futures declined 0.2%, S&P 500 futures slipped 0.2%, while Nasdaq 100 futures lost 0.4%
  • Nvidia exceeded earnings forecasts but delivered disappointing sales guidance, causing shares to trade sideways
  • Crude oil prices rallied, with Brent crude surging back above $106 per barrel amid renewed Iran stalemate concerns
  • SpaceX submitted its S-1 registration document to the SEC in preparation for a June investor road show

US equity futures retreated during Thursday’s premarket session following a directive from Iran’s supreme leader prohibiting the export of enriched uranium. This development raised serious questions about the viability of ongoing peace negotiations between Washington and Tehran.

Dow Jones Industrial Average futures decreased 0.2%. Futures for the S&P 500 similarly lost 0.2%, while contracts for the Nasdaq 100 slid 0.4%.

E-Mini S&P 500 Jun 26 (ES=F)
E-Mini S&P 500 Jun 26 (ES=F)

The three primary benchmarks had ended a three-day decline on Wednesday following President Trump’s announcement that the US was nearing the conclusion of negotiations with Iran.

Trump stated Wednesday that he was prepared to allow “a couple of days” for Iran to consider the most recent US peace framework. The supreme leader’s uranium export ban swiftly erased that market confidence.

Nvidia’s Quarterly Results Generate Muted Market Reaction

Nvidia unveiled first-quarter financial results Wednesday evening, surpassing analyst projections for both earnings and revenue. The artificial intelligence semiconductor manufacturer also provided an optimistic outlook for chip demand.

Nevertheless, market participants had anticipated a more robust performance. The revenue guidance exceeded expectations by a narrower margin than investors had become accustomed to, leaving shares essentially unchanged in early premarket activity.

Deutsche Bank’s analyst Jim Reid observed that even with remarkable growth and a 75% gross margin, the modest guidance improvement generated a tepid market reaction.

Crude Prices Surge Amid Diplomatic Stalemate

Oil prices advanced significantly Thursday morning as the US-Iran diplomatic impasse persisted. Brent crude surged back above the $106 per barrel threshold, while West Texas Intermediate jumped 2.5% to approximately $100.67.

Elevated oil prices have pressured bond markets throughout this geopolitical crisis. Investors worry that escalating energy expenses could accelerate inflation, potentially prompting the Federal Reserve to implement additional interest rate increases.

The 10-year Treasury note yield climbed 3 basis points during early trading to reach 4.62%.

Moments after Nvidia released its quarterly results, SpaceX submitted its S-1 registration filing with the Securities and Exchange Commission. The document provided public investors with an unprecedented glimpse into the company’s financial position before its scheduled June investor presentations.

Earnings season continues its final stretch this week. Walmart, Ross Stores, Workday, and Zoom Communications are scheduled to announce quarterly results on Thursday.

Market participants will remain focused on any developments regarding Iran negotiations, which continue to serve as the primary catalyst for market sentiment entering today’s trading session.

The post Stock Futures Tumble as Iran Nuclear Standoff Rattles Markets Before Thursday Open appeared first on Blockonomi.

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