Iran attacked again this weekend. Here's what to expect at Monday's open.

It is Sunday night, and Iran is back on the front page. Over the weekend the US bombed Iranian coastal sites near the Strait of Hormuz, Iran’s Revolutionary Guard hit two US military bases in response, and US forces struck again on Sunday. President Trump is now threatening to “militarily complete the job,” and Iran is threatening to walk away from the peace talks entirely. So here we are again, looking at a Monday open with the Middle East on fire. The real question is simple: do you expect another shrug, or is this the one that finally takes the market down?

Here is my honest read, with the actual numbers, before stock futures reopen Sunday at 6 p.m. Eastern.

Where things stand right now

Wall Street did not wait for the weekend to get nervous. Friday was the Nasdaq’s fifth straight losing session, though the moves themselves were small: the Nasdaq Composite slipped 0.24 percent, the S&P 500 finished basically flat at 7,354, and the Dow eased 0.09 percent. The VIX, the market’s fear gauge, sat around 18. Not panic, but a market with no appetite for new risk going into the weekend.

The standout is oil, and it is the opposite of what you would guess. West Texas Intermediate, the US benchmark, settled Friday at $69.23 a barrel, under $70 for the first time since the war began in late February. Brent, the global benchmark, finished around $72.60. Crude has been falling, not rising, even with bombs in the neighborhood. That detail matters more than anything else for Monday, and I will get to why.

Tech was already having a rough month

Here is the context that matters: these Iran headlines are landing on a tech sector that was already tired. The Nasdaq fell about 4.6 percent last week alone, capping a brutal stretch where semiconductors shed more than a trillion dollars in market value, Korea’s memory giants got hammered, and a report that OpenAI might push its IPO into next year spooked the AI-spending bulls. Some of that is a real debate about whether AI spending can justify the valuations. We walked through the Korea piece of it when the Kospi kept halting and Micron (MU) round-tripped its overnight plunge.

But some of it is just the calendar. June tends to be soft for tech, and the back half especially. The Nasdaq 100 has averaged only about a 0.6 percent gain in June since 1990, one of its weaker months, and the final week or so often sags as fund managers lock in first-half gains and rebalance before quarter-end. A tired tech tape going into a scary weekend is closer to normal than to alarming. The flip side worth knowing: the first half of July has historically been one of the strongest stretches of the year for the Nasdaq, higher about 76 percent of the time since 1985. We got into that in what history says about tech stocks in July of a midterm year.

The pattern says shrug, and here is why

The 2026 Iran war started the weekend of February 27 and 28, when the US and Israel struck Iran. Oil did the obvious thing back then: Brent ran from around $72 a barrel past $100 in early March and peaked near $120 once the Strait of Hormuz got disrupted, and the S&P 500 fell almost 10 percent into late March.

Then it came straight back. According to J.P. Morgan, that near-10 percent drop was fully recovered in only about 11 trading sessions, and the index was back near record highs within roughly six weeks. A ceasefire landed April 8, the fighting flared and calmed a few more times, and on June 17 the US and Iran signed a deal meant to end the war. Every time the temperature dropped, stocks rallied.

The base rates back up that reflex. LPL Research looked at more than two dozen major geopolitical shocks over the decades and found the S&P 500 fell only about 1 percent on the average first day, drew down around 7 percent at the worst, and was back to even in under 39 days. Morgan Stanley found the index was up an average of 8.4 percent in the 12 months after these shocks. And J.P. Morgan made the key point that the 2026 recovery was already underway before the geopolitics cleared up, driven by company fundamentals, with about 83 percent of S&P 500 companies beating earnings estimates. The dip got bought because the business was fine, not just because a ceasefire got signed.

Why this Monday is the one I would actually watch

Two things make this weekend different from the ones the market waved off. First, it is an escalation, not a ceasefire. The earlier Monday rallies came after de-escalation news. This time both sides are shooting.

Second, and this is the one that counts, it puts the Strait of Hormuz back in play. About a fifth of the world’s oil moves through that channel. The only reason crude fell all the way to $69 is that the oil kept flowing through it: ships transited freely, Iranian exports climbed back toward three-quarters of prewar levels, and on June 22 the US even issued a 60-day license letting buyers around the world purchase Iranian crude. Over the weekend that started to reverse. Iran has again been limiting traffic through Hormuz and charging tolls reported above $1 million a ship, and its foreign minister said Sunday that only Tehran will decide when it reopens. That is the calm-oil story flipping in real time, and the market has not had a chance to price it yet.

So what do I actually expect?

Base case: another fade. The most likely outcome, going by four months of this exact movie and decades of history, is a jumpy open, maybe a quick dip in the riskier corners, and buyers showing up before too long. The norm.

But this is the first Monday in a while where I would keep one eye on the exits, and the tell is oil, not stocks. If WTI gaps up and stays up, say back toward the $80s and holding, that is the market pricing a real supply threat. That is the scenario, like 1990 when Iraq invaded Kuwait, oil shocked higher and the economy tipped into recession, that turns a 7 percent dip into something closer to 16 percent and stretches the recovery from weeks into months. If crude instead pops a few dollars at the open and then fades back, the pattern holds and the dip is probably a buy again. Watch the price of oil, not the cable-news chyron.

What to watch at the open

A few tells will tell you fast which way this is going:

• Oil first. Watch Exxon (XOM) and Chevron (CVX), both up around 22 percent this year as of mid-June and among the war’s clearest winners. If oil gaps up, they lead and the rest of the market gets nervous.
• Defense names. Lockheed Martin (LMT), RTX (RTX), Northrop Grumman (NOC) and General Dynamics (GD) tend to catch a bid on escalation headlines.
• The fear gauge. A VIX that jumps well above Friday’s 18, plus a stronger dollar and gold, would say investors are actually scared this time, not just trading the headline.
• Asia overnight. Japan’s Nikkei and Korea’s Kospi open hours before New York and have set the tone all year, so Sunday night into Monday morning is your first real read.

The bottom line: the market has been right to fade these weekend scares all year, and the base rates say fast recoveries are the norm, so that is still the bet. But the pattern has exactly one real enemy, a sustained oil shock, and this is the first Monday in a while where that risk is live rather than theoretical. Most likely you get the norm. Just respect the oil tail this time. For the names we already had our eye on this week, here is our bullish watch for the week of June 29.

Nothing here is investment advice, and no one can predict a single trading session. Geopolitical headlines can move markets violently in both directions, and an oil shock is a real risk. Do your own research.

Cover photo: crude oil tanker at sea, by Bernard Spragg, NZ / Wikimedia Commons, public domain (CC0).