Here's a classic market move: a geopolitical threat sends oil prices soaring and stocks tumbling, then a hint of peace sends everything violently into reverse. That's exactly what happened early Monday after President Donald Trump announced a five-day pause on all U.S. strikes against Iranian energy infrastructure.

The reason? "Very good and productive conversations" with Tehran, according to Trump's post, aiming for a "complete and total resolution" of hostilities. The immediate effect was oil futures down more than 8% and Dow futures surging over 900 points. It's the sharpest de-escalation signal since the conflict, dubbed Operation Epic Fury, began on February 28.

The Pivot from Ultimatum to Pause

So what changed? The tone shifted notably over the weekend. On Saturday, Trump issued a stark 48-hour ultimatum, warning that failure to fully reopen the Strait of Hormuz "without threat" would trigger U.S. strikes on key Iranian energy assets, starting with "the biggest one first."

By Monday, the message was about postponing military strikes for five days, "subject to the success of the ongoing meetings and discussions." It's a dramatic pivot from saber-rattling to negotiation—at least in the public statements.

However, shortly after Trump's post, Iran's Fars News Agency said Tehran has had no direct contact with the United States, "neither directly nor through intermediaries." So, we have a U.S. president talking about productive talks and an Iranian news agency saying no talks happened. Markets, as they often do, chose to react first and ask questions later.

Markets Don't Wait for Confirmation

And react they did. West Texas Intermediate crude plunged 8.27% to $90.10 a barrel. Brent crude fell 7.91% to $103.31. Just before the announcement, both benchmarks were trading above triple digits, with Brent above $113, as Trump's 48-hour Hormuz ultimatum neared its expiration. Since the start of the conflict, prices had risen approximately 32.5% from a pre-war level near $68 per barrel.

On the equity side, the relief rally was just as sharp. Futures on the S&P 500, as tracked by the SPDR S&P 500 ETF Trust (SPY), climbed 1.91%. Dow Jones Industrial Average futures rose 2.1%, or about 800 points. Nasdaq 100 futures were up nearly 2%. This marks the biggest single-session relief trade since the offensive began.

Traders also sharply repriced the odds of the Strait of Hormuz reopening. The probability of traffic returning to normal by April 30 jumped to 43% following Trump's de-escalation post.

The Clearest Signal Came from Travel Stocks

If you want to see where the pain was—and where the relief is most acute—look at the stocks that got hit hardest by the war. The most decisive premarket moves came from airlines and cruise lines.

Delta Air Lines Inc. (DAL), United Airlines Holdings Inc. (UAL), and Southwest Airlines Co. (LUV) were each gaining about 5% in premarket trading. This makes perfect sense: airline earnings are disproportionately sensitive to fuel costs. According to Jefferies estimates, each 5% move in fuel prices translates to a 5%–10% swing in earnings-per-share for carriers like Delta and United. The U.S. Global Jets ETF (JETS) had declined by 15% since the conflict began, so a bounce was overdue.

Cruise lines, another fuel-sensitive group, also rallied sharply. Carnival Corp. (CCL) and Royal Caribbean Cruise Ltd. (RCL) were up 4.8% and 4.6%, respectively.

Is the "TACO Trade" Back in Play?

All this action brings us to the Wall Street playbook known as the TACO trade. TACO stands for "Trump always chickens out." It's a pattern investors have seen before: aggressive posturing that rattles markets, followed by a retreat once economic pressure rises. The idea is that if you buy the dip during the panic, you'll typically be rewarded when the tension eases.

This pattern played out notably during the tariff shock of April–May 2025, and in other episodes where Trump threatened military action but ultimately didn't follow through. The question now is whether a five-day pause in an active conflict fits that same old playbook. Is this just another chapter in the TACO trade saga, or is this time different? Has the pattern, where markets bet on de-escalation after initial panic, finally reached its limits? For one day at least, traders betting on the classic TACO script were handsomely rewarded.