Markets hate uncertainty. Earlier in the week, investors were preparing for possible military escalation involving one of the world's most important oil-producing regions. Oil surged above $90 per barrel, semiconductor stocks sold off, and risk appetite vanished.

Then came the surprise. Trump announced that the planned strikes had been canceled, citing progress in negotiations and suggesting a broader agreement could be approaching. Investors immediately rushed back into stocks while oil prices moved sharply lower.

The reaction was a reminder that markets often move on expectations, not just events.

The rebound wasn't really about politics. It was about risk.

If conflict expands in the Middle East, investors worry about oil supplies, inflation, shipping routes, and economic growth. If tensions cool, many of those concerns quickly fade. That's why stocks surged while oil fell.

The Dow jumped more than 900 points, the Nasdaq rallied sharply, and semiconductor stocks staged one of their strongest recoveries in months as traders reversed defensive positions. For a market preparing for escalation, even a temporary move toward diplomacy felt like a major positive surprise.

Some investors believe the threats themselves were part of a broader negotiation strategy. Trump had previously warned that the U.S. would hit Iran "very hard" if talks failed. Yet shortly afterward, negotiations appeared to accelerate and the strikes were called off.

Supporters of this view argue that military action may never have been the primary objective. Instead, the threat of action may have been designed to pressure Iran into concessions.

Whether that's true remains unclear. But markets clearly interpreted the cancellation as a sign that diplomacy currently has a better chance than escalation.

One of the most important reactions occurred in energy markets. If investors truly believed a major conflict was imminent, oil would likely continue climbing.

Instead, crude oil fell sharply after the announcement as traders removed part of the geopolitical risk premium built up during the week. Both Brent and WTI posted notable declines as fears of immediate supply disruptions eased.

That doesn't mean the danger has disappeared. It simply means investors now view a worst-case scenario as less likely than they did a few days ago. In markets, changes in probability often matter more than headlines.

The key question isn't whether stocks rallied for a day. It's whether the rally has staying power.

If tensions continue cooling, investors may refocus on AI spending, earnings growth, and economic data. If talks break down, markets could quickly revisit the same fears that triggered the selloff.

For now, investors appear to be betting on de-escalation. But geopolitical stories can change quickly, and markets have learned that lesson many times before.

If you want deeper breakdowns on market psychology, geopolitical events, and how institutional investors react during periods of uncertainty, explore the research and analysis across our platform.

Because some of the biggest market moves happen when expectations change faster than the facts.

With 20 years of investment expertise, Caleb Gan is a seasoned professional in stock trading. The hard work and dedication were recognized when his partner and him were featured on Singapore TV Channel 9's MoneyWeek, a prominent financial program. He's also had the privilege to share insights on radio stations like 93.8Live, Capital 95.8FM, and 96.3FM through live interviews about stock market investments. Beyond that, he's also the co-founder of NDU System, where he continues to help others navigate the world of trading.

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