S&P 500 futures are up 1.7%, reversing a –1% overnight deficit after President Trump posted on Truth Social that the U.S. would halt planned strikes on Iranian power plants and energy infrastructure for five days, citing "very good and productive conversations" with Tehran.^[1] WTI swung more than $13 in a single session — from a touch below $100 to a session low of $85.28 before recovering to the low $90s.^[2] Iran's foreign ministry immediately denied any direct or indirect contact with Washington, which is why the VIX is still above 24 and the ten-year yield is pressing 4.43%: the market bought the headline but hasn't decided to believe it.

What's driving it

The overnight session opened in deep red. Asian markets plunged — Nikkei –3.5%, Kospi –4.9% — as traders priced in Trump's weekend ultimatum: reopen the Strait of Hormuz within 48 hours or face the destruction of Iranian energy infrastructure.^[6] The Strait has been effectively closed since the conflict began February 28, and the IEA's executive director called the current shock worse than the combined oil crises of 1973 and 1979.^[7]

Then Trump's Truth Social post hit in the early morning hours, and the arithmetic flipped. Oil fell off a cliff, equity futures snapped from –1% to nearly +2%, and the VIX shed roughly 7%. The five-day pause resets the immediate strike timeline and temporarily removes the scenario markets had been pricing: a direct U.S. attack on Iranian power plants that would almost certainly escalate the Strait closure from a threat posture into a permanent feature.

Iran's categorical denial is the unresolved variable. Tehran said the ceasefire signal was an attempt "to suppress energy prices and buy time." Every statement out of Tehran today will move futures.^[1]

On the calendar

The Chicago Fed National Activity Index for February came in at –0.11 this morning, down from +0.20 in January — confirming that the economic acceleration at the start of the year has faded, likely reflecting early war-related confidence and energy-cost drag.^[5] It's a light data day otherwise. S&P Global's flash PMI doesn't print until Tuesday. The scheduled calendar is not the story today.

Movers

Synopsys (SNPS) is up 3% pre-market after Bloomberg reported overnight that Elliott Investment Management has built a multibillion-dollar stake in the chip-design software company and plans to push for improvements in software monetization.^[4] SNPS has lagged rival Cadence by double digits over the past year while the broader SOX index is up more than 70% — that gap is precisely the arbitrage Elliott will argue.

ExxonMobil is up on the session but trading at more than twice its normal volume, caught in the oil whipsaw. The stock hit a 52-week high of $162.44 early this morning on sustained above-$95 crude, then whipped lower as WTI crashed on the Trump announcement. The energy sector's year-to-date outperformance — up 7.5% vs. the broader market's four-week losing streak — is entirely a Hormuz premium. How much of it survives a diplomatic resolution is the sector's standing question.

The setup

The session has one question: is the five-day pause a genuine diplomatic opening or a market management tactic? Iran's denial is the counterevidence, and it's the piece the rally cannot shake. If Tehran signals any contact or the Strait shows reopening movement, the equity bid deepens and WTI falls further. If Iran escalates — another missile salvo, another Hormuz closure statement — the tape re-prices the entire overnight move. The ten-year at 4.43% and VIX above 24 are the market's honest assessment: it bought the news without declaring victory.