The S&P 500 had a solid day on Thursday, climbing 0.81% to close at 7,543.64, powered by a semiconductor rebound and easing oil prices. But if you ask the crowd on Polymarket, they're not expecting that momentum to carry into Friday's open. The prediction market contract for July 10 implies just a 20% probability that the index will open higher — meaning most traders are bracing for a weaker start.

That might seem odd given Thursday's strength, but it's actually a pretty good snapshot of where markets are right now: caught between genuine bullish drivers and a persistent undercurrent of caution.

Why That Number Matters

Thursday's rally was a reminder that sentiment can flip fast. The big catalyst? Cooling oil prices, after President Donald Trump said Iran had reached out seeking negotiations. Officials from Qatar and Pakistan are also working to restart talks between Washington and Tehran. That helped improve risk appetite, even as geopolitical uncertainty remains front and center.

But the real engine of the rally was, once again, semiconductors. The VanEck Semiconductor ETF (SMH) rose 2.5%, Micron (MU) gained 4.5%, and Sandisk (SNDK) jumped 7.6%. The chip sector continues to be the market's biggest source of strength, reinforcing the view that artificial intelligence is still the primary driver of this year's bull market — even as investors rotate between sectors.

Optimism spilled over into Asia, too. SoftBank surged more than 11%, and South Korean tech stocks advanced ahead of SK Hynix's Nasdaq debut on Friday. That's a big event to watch, as it could provide fresh signals on investor appetite for memory chips and AI-related plays.

Also on Friday's calendar: second-quarter earnings from Delta Air Lines (DAL), which will give us an early read on earnings season and how companies are navigating the current environment.

The Bull Countercase

So if things are looking up, why are Polymarket traders so bearish on the open? Partly it's just the nature of prediction markets — they reflect probabilities, not certainties. But there are real reasons for caution.

Futures turned lower overnight, with S&P 500 futures slipping 0.22% early Friday. Investors remain wary of the geopolitical backdrop and elevated inflation risks. Even as the market trades near record highs, there's a nagging fear that persistent price pressures could keep the Federal Reserve on a hawkish path. That tension — between AI-fueled optimism and macro caution — is the defining feature of markets right now.

Interestingly, betting activity on Polymarket has cooled off. The July 9 contract, which resolved "Up" after the S&P 500 opened above Wednesday's close, saw just $25,832 in traded volume — the lightest participation since the start of July. That's a far cry from the $374,000-plus that flowed through on July 1. It suggests traders are getting more cautious, or at least less certain, as geopolitical headlines continue to drive sentiment.

So what's the takeaway? The bull case is still alive and well, powered by AI and semiconductors. But the path forward is anything but smooth. Friday's open will be a test of whether the market can shake off the overnight jitters and keep climbing — or if the Polymarket crowd has it right.