Stock Futures Wobble as Trump’s Hormuz Blockade Meets Earnings Season

Stock futures slipped early Tuesday after President Donald Trump revived the naval blockade of Iran and floated a 20% toll on cargo crossing the Strait of Hormuz, sending Brent crude to its biggest one-day jump since 2020. Dow futures fell 187 points before paring most of that loss within hours.

Wall Street was already bracing for a stacked Tuesday: big bank earnings, the June inflation report and new Fed Chair Kevin Warsh’s first testimony to Congress. Now all three have to be read against a barrel of oil that just jumped nearly 10% in a single session.

Trump Revives the Hormuz Blockade, and Oil Does the Rest

Dow Jones Industrial Average futures fell 187 points, or 0.4%, in early Tuesday trading. S&P 500 futures were down 0.3% and Nasdaq-100 futures slid 0.4%, tracking a Monday session in which the S&P 500 shed 0.8% and the Nasdaq Composite dropped 1.6%.

The selling followed a Truth Social post from Trump announcing the U.S. would reimpose its blockade on Iranian shipping. “We are reinstating the THE IRANIAN BLOCKADE, so named because it is only stopping Iran’s ships or customers from entering or leaving,” he wrote, adding that the U.S. would become “THE GUARDIAN OF THE HORMUZ STRAIT” and collect a 20% fee on all other cargo shipped through the waterway. U.S. Central Command, or CENTCOM, said the blockade would take effect Tuesday at 4 p.m. ET, targeting vessels moving to or from Iranian ports.

Brent crude settled Monday at $83.30 a barrel, up 9.6%, its best single-day performance since May 2020, when prices spiked nearly 14%. West Texas Intermediate gained 9.4% to $78.14. The jump followed a weekend in which Iran and the U.S. traded strikes for the fourth time in a week, after Tehran fired on a commercial vessel in the strait and declared it closed.

By Tuesday morning, though, the panic had cooled. Oil had already logged a weekly gain of about 4.7% even before Monday’s spike, and the initial Dow futures slide of 187 points had narrowed to just 15 by the time cash markets neared the open, a sign traders were already looking past the weekend’s exchange of fire toward the data still to come.

Three Reports, One Tuesday

The timing is unusually crowded. Big bank earnings, the Consumer Price Index (CPI), the government’s main monthly inflation gauge, and Warsh’s first semiannual appearance before Congress all land within hours of each other, on the same morning oil is trying to find a new floor.

Markets had already been volatile into the week. The VIX nearly hit 19 before easing, according to Charles Schwab’s trading desk, as investors weighed the ceasefire’s collapse against a second straight quarter of earnings growth above 20%.

Today was a little bit of an outlier. Everything was kind of down today. But in general, it doesn’t really change the way we look at the earnings season. We feel pretty constructive about large tech in general. We do think earnings have some upside.

Michael Graham, director of research and investment strategy at Canaccord Genuity, an investment bank, gave that read to CNBC’s “Closing Bell: Overtime” after Monday’s close.

The Chip Selloff Meets the Cost of Gas

Two channels are carrying the shock into household and portfolio budgets at once: semiconductors and the pump.

• SK Hynix – shares fell more than 8% in Seoul Tuesday, extending a record one-day drop as investors unwound gains from its Nasdaq debut
• Micron and SanDisk – the memory-chip makers dropped 6% in premarket trading, dragged down by SK Hynix’s slide
• Nvidia, Intel, AMD and Broadcom – all traded lower even after Taiwan Semiconductor Manufacturing Co. reported blockbuster quarterly numbers
• Microsoft – drew defensive buying, with traders calling it one of the market’s safest earnings plays this week

Jung In Yun, founder and chief executive officer at Fibonacci Asset Management, an investment firm, said the SK Hynix slide reflected profit-taking and American depositary receipt (ADR) arbitrage rather than any change in the chipmaker’s outlook. “The ADR itself was not the main cause, but it accelerated short-term positioning. Investors who had benefited from the strong run-up used the successful ADR debut as an opportunity to lock in gains,” he said.

Micron’s own slide has deepened a rout that had already pulled the chipmaker into a bear market this year. Meanwhile, retail pumps are catching up to the oil move: Colorado’s statewide average pushed past $3.60 a gallon this week, mirroring increases reported in other states as the crisis fed through to retail prices.

Washington’s New Toll Sounds a Lot Like Tehran’s Old One

The 20% figure is where this story gets complicated. Trump wants to charge it. Iran already tried to.

Tehran created the Persian Gulf Strait Authority in May to issue what it called safe passage permits, an early attempt to monetize the same chokepoint. When Trump floated his own toll Monday, Iranian Foreign Minister Abbas Araghchi did not reject the concept. He endorsed it. “POTUS is absolutely right. Whoever provides secure and safe passage of commercial vessels through the Strait of Hormuz should be compensated for this service,” Araghchi wrote, before adding that Trump’s number was too high. “20% is of course too much. We will be fair,” he said.

International regulators disagree with both of them. The International Maritime Organization (IMO), the United Nations agency that oversees global shipping, said it stands firmly against charging fees for passage through straits used for international navigation, arguing there is no legal basis for mandatory tolls under transit passage rules under the 1982 Law of the Sea treaty. That echoes U.S. Secretary of State Marco Rubio’s own past position that no country may charge tolls on an international waterway, and the U.S. Treasury has separately warned that any company paying Iran directly for passage risks sanctions for what it calls maritime extortion.

• Nader Habibi, economist: paying Iran directly would be cheaper than sustaining a blockade, since an idle tanker bleeds money every day it waits, he told Al Jazeera
• The IMO and U.S. Treasury: any toll is illegal under maritime law, and firms that pay Iran for passage risk sanctions for what Treasury calls maritime extortion
• Herbjorn Hansson, Nordic American Tankers CEO: Trump’s 20% figure is unrealistic, and the strait needs an administration both countries actually accept

Hansson put it bluntly in an interview with CNBC. “Iran is suffering, America is suffering, 192 countries outside the Hormuz Strait are suffering,” he said.

The Strait’s Third Blowup Since February

None of this is new. The war began February 28, when the U.S. and Israel struck Iran, and oil spiked into the triple digits during the worst of the fighting that followed. Shipping through Hormuz collapsed for weeks.

A ceasefire and a memorandum of understanding, signed June 17, were supposed to fix that. The deal called for lifting the U.S. blockade and restoring normal transit within 30 days. It held for less than a month. At the NATO summit in Ankara on July 8, Trump declared the ceasefire “over,” and by the weekend the two sides were exchanging fire for the third weekend in a row.

Traffic never really recovered even during the truce. Shipping companies stayed wary of the route the entire time, citing sea mines and elevated war-risk insurance premiums, according to Nikos Petrakakos, managing director of investments at Tufton Investment Management. Shipping companies remained wary of the route even after the ceasefire took hold, he said, adding that traffic was “nowhere near being back to where it was.” Producers spent the interim building out alternate capacity, part of a pipeline boom built to bypass the strait entirely.

CENTCOM framed the latest strikes as necessary to keep the route open. “These strikes will continue imposing a heavy cost on Iranian forces and degrade their ability to attack innocent civilians and commercial shipping in the Strait of Hormuz,” it said in a post on X.

Will Tuesday’s Inflation Number Even Matter by Friday?

Tuesday’s Consumer Price Index report covers June, a month when energy prices were still falling and Hormuz was quiet. That snapshot already looks dated less than 24 hours after Brent’s biggest jump since 2020.

Dow Jones economists expect headline CPI to cool to a 3.8% annual rate and core prices, which strip out food and energy, to hold at 2.8%, still well above the Fed’s 2% target. If oil keeps climbing through July, that cooling narrative gets tested almost immediately, right as Warsh has to explain his approach to lawmakers for the first time as chair.

The rest of the world is not waiting to find out. China’s exports jumped 27% in June from a year earlier, the fastest pace since October 2021, with imports up 36% and a trade surplus of $125.6 billion, ahead of an expected Politburo meeting late this month that investors hope will signal fresh stimulus. Singapore’s economy grew 5.7% in the second quarter, beating forecasts on strong manufacturing output. Both prints landed the same week Wall Street is deciding whether an oil shock changes anything about the earnings story it has been telling itself since spring.

For now, gasoline is the fastest-moving transmission line between the strait and the average household, and GasBuddy already expects it to show up at the pump within days.

Frequently Asked Questions

What does Trump’s Strait of Hormuz blockade actually do?

The blockade, which CENTCOM said would begin Tuesday at 4 p.m. ET, targets vessels transiting to or from Iranian ports and coastal areas. Non-Iranian traffic is not meant to be impeded, and humanitarian shipments such as food and medical supplies are still permitted into Iranian ports, subject to inspection. Ships that enter or leave the blockaded area without authorization face interception, diversion or capture.

Is the Strait of Hormuz actually open right now?

Both sides dispute this. CENTCOM says the strait remains open to all vessels seeking to lawfully transit, but the maritime intelligence firm Windward tracked just nine vessels crossing on Saturday, compared with roughly 138 a day before the war. The Joint Maritime Information Center, a U.S.-led naval coalition based in Bahrain, still advises mariners to exercise extreme vigilance given the deteriorated security situation.

Will gas prices go up because of this?

Very likely, and fast. Patrick De Haan, an analyst at GasBuddy, said he expects the national average price of gasoline to reach $4 a gallon within seven to ten days if the blockade holds, with retailers starting to pass along increases within 24 to 48 hours.

Why is Iran’s foreign minister agreeing with a U.S. toll plan?

Because Iran wanted to charge one first. Tehran established the Persian Gulf Strait Authority in May specifically to issue permits and fees for passage through the strait, so when Trump proposed his own 20% toll, Iran’s Abbas Araghchi backed the underlying idea while arguing for a lower rate.

How much of the world’s oil actually depends on this waterway?

Around 20% of global oil supply and a large share of liquefied natural gas normally transit the Strait of Hormuz. Even before Monday’s announcement, traffic through the strait had plunged 52% week over week, according to shipping data cited by NBC News, meaning much of the disruption was already underway before Trump’s blockade post.