Will S&P 500 Open Up Or Down On April 27? Here’s How Polymarket Traders Lean As Trump Halts Iran Talks And Oil Spikes

The S&P 500 enters the final week of April on the heels of a strong performance, having gained 0.80% on Friday to close at 7,165.08. However, fresh geopolitical friction over the weekend is testing investor resolve as the new trading week begins.

The Polygon-based (CRYPTO: POL) Polymarket crowd is maintaining a bullish outlook for the Monday open. The “S&P 500 Opens Up or Down on April 27?” odds currently show a 65% chance of an “Up” open.

Why That Number Matters

Geopolitical risk has surged back to the forefront after a weekend of hardline rhetoric. President Donald Trump announced on Saturday that he canceled plans for envoys to meet with Iranian leadership in Pakistan, citing divisions within Tehran. Trump’s declaration that the U.S. has “all the cards” sent immediate ripples through the energy markets.

The impact was felt across multiple asset classes on Sunday evening:

• Energy Spike: At the last check, Brent crude climbed 1.97% to $101.08 per barrel, while WTI crude rose 1.63% to $95.94.
• Maritime Standoff: U.S. Central Command reported that 38 ships have been redirected or turned away as part of a blockade against Iranian ports, a move Iran’s military has condemned as “piracy.”
• Futures Divergence: S&P 500 futures were up slightly by 0.03%, and Nasdaq 100 futures gained 0.21%, even as Dow futures slipped 0.16%.

The Bull Case

Despite the escalating tensions, the fundamental backdrop of a strong earnings season continues to provide support. As of late April, over 85% of S&P 500 companies have beaten EPS expectations according to FactSet data.

Traders betting on an “Up” open are likely focused on the continued momentum of chipmakers and AI-driven demand.

How The Previous Bet Played Out: The April 24 Polymarket bet resolved “Up” after a surge in pre-market sentiment. Confidence was between 40-50% higher just before the bell as tech-driven demand and a massive earnings beat from Intel Corp. (NASDAQ:INTC) lifted the benchmark. Total trading volume for the Friday bet reached $215,582.

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