U.S. stock futures are showing a mixed-to-slightly-flat picture early Tuesday as Wall Street balances new U.S. sanctions targeting Iranian airlines against fresh corporate earnings reports and lingering market optimism from Monday’s AI-led rally.

The Polymarket (CRYPTO: POL) crowd is leaning slightly bullish for the Sept. 22 trading session. The “S&P 500 (SPX) Up or Down on September 22?” contract currently reflects a 53% chance of a higher open.

Sept 21 Polymarket Odds For S&P 500 Opening

Why That Number Matters

Traders are navigating a mix of geopolitical escalations, oil price movements, and central bank commentary:

  • Mixed Index Futures: Equity futures are pointing to a quiet, mixed open across major benchmarks. S&P 500 futures dipped 0.01%, Dow Jones futures fell 0.06%, and Russell 2000 futures dropped 0.07%. Meanwhile, Nasdaq 100 futures ticked up 0.08%.
  • Geopolitics & Rising Oil: U.S. Treasury Secretary Scott Bessent announced that Iranian airlines will be “shut down” worldwide by Wednesday, warning foreign entities that providing fuel or landing services will result in exclusion from the dollar-based financial system. Treasury also targeted major foreign financial institutions in Egypt, Turkey, and Russia for facilitating Iranian transactions. Energy prices bounced higher following the news, with Brent crude futures advancing 1.38% to $101.72 per barrel and WTI crude rising 1.13% to $93.41 per barrel.
  • Fed Speeches & Economic Data: Richmond Fed President Thomas Barkin is scheduled to speak to the CFA Society Baltimore at 1:00 p.m. ET, giving investors further perspective on central bank policy following last week’s interest rate hike.

The Bull Case and Market Outlook

According to Nigam Arora, equities surged on Monday as investors bought into momentum surrounding potential diplomatic proposals, a U.S.-Greenland security agreement, and reports that Anthropic’s IPO is slated for November. Big tech names led the charge, with positive early money flows lifting Big Tech stocks.

However, the Arora Report advised caution, noting that while Bitcoin’s push above $85,000 and optimism ahead of the Trump-Xi summit are driving short-term sentiment, core geopolitical conflicts and technical hurdles remain unresolved. Prudent investors will want to see if corporate earnings can sustain the rally if Middle East frictions escalate further.

How the Previous Bet Played Out

The Sept. 21 Polymarket contract resolved “Up” after the S&P 500 opened higher on Monday. The contract recorded $60,240 in total trading volume.

On Monday, the SPDR S&P 500 ETF Trust (NYSE:SPY) and Invesco QQQ Trust ETF (NASDAQ:QQQ), which track the S&P 500 and Nasdaq-100, respectively, closed higher. SPY rose 1.55% to $773.50, while QQQ rose 2.88% to $741.47. Meanwhile, the Dow tracker, State Street SPDR Dow Jones Industrial Average ETF Trust (NYSE:DIA), ended 0.76% higher at $519.78.

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Disclaimer: This content was partially produced with the help of AI tools and was reviewed and published by Benzinga editors.

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