Hormuz Traffic Collapses to 15% as Houthis Open Second Front on Saudi Oil

Vessel traffic through the Strait of Hormuz has collapsed to roughly 15% of pre-war levels after a U.S. blockade and renewed strikes on Iran drove mainstream shipowners away from the waterway that carries about a fifth of global oil consumption^[1]. Lloyd’s List Intelligence recorded just 53 vessel transits in the week through July 20, down 66% from 157 the prior week; tanker and gas carrier movements fell to 30 crossings from 90^[1]. Kpler data shows daily crossings dropped from more than 20 before mid-July to single digits by July 16^[1].

The slowdown reverses weeks of gradual normalization that followed a mid-June ceasefire. That ceasefire has since collapsed, and ten consecutive nights of U.S. bombing have failed to break Iran’s grip on the strait^[2].

Houthi blockade opens a second front

On July 20, the Iran-backed Houthis declared a maritime blockade of Saudi Arabia, threatening a second chokepoint for global oil at a moment when the Strait of Hormuz is already nearly sealed^[3]. The announcement targets Saudi Arabia’s Red Sea port of Yanbu, which exports approximately four million barrels of oil per day — up 400% from pre-Iran-war levels — and the Bab el-Mandeb strait, through which more than seven million barrels per day transited in June^[3].

The Bab el-Mandeb had emerged as a critical alternative route to Hormuz, and its closure would compound a supply deficit already estimated at four million barrels per day from the Hormuz shutdown^[3]. The strait represents about 7% of global oil supply^[3]. If the Houthis can strike Yanbu itself — roughly 800 miles from their territory — rather than merely harassing shipping, they could disrupt Saudi exports at the source. Prior to the 2022 U.N. truce, the Houthis targeted Yanbu multiple times with missiles and drones^[3].

Oil surges to a five-week high

Brent futures rose $1.79, or 2.0%, to settle at $91.01 a barrel on July 21 — a five-week high — while WTI crude traded near $84.64^[4]. Both benchmarks are sharply higher than the approximately $70 level seen before U.S.-Israeli operations against Iran began in late February^[5]. A brief decline toward that floor following the June ceasefire proved short-lived^[5].

Saul Kavonic, head of energy research at MST Marquee, told CNBC that oil could retest $100 a barrel if the current intensity of fighting persists for several weeks or if regional energy infrastructure comes under direct attack^[1]. Global inventories, which had provided a buffer, are nearing operational minimums^[3].

Wall Street bends but doesn’t break

The Dow Jones Industrial Average fell 0.6% (307 points), the S&P 500 slid 0.2%, and the Nasdaq Composite finished roughly flat on July 21^[5]. Semiconductor shares had surged as much as 3% intraday before pulling back on news of the latest U.S. strike on Iran, closing with a 0.6% advance^[5]. The CNN Fear & Greed Index remained in the “Fear” zone^[6].

Energy stocks outperformed the broad market. ExxonMobil (XOM) closed up 2.3% at $151.71^[7], Chevron (CVX) rose 0.7% to $191.07^[7], ConocoPhillips (COP) gained 1.6% to $117.50^[7], and the United States Oil Fund (USO) advanced 2.7% to $128.85^[7]. The divergence — oil majors rising while equity averages slip — is the classic risk pattern when a supply shock hits alongside broader uncertainty about where the conflict is heading.

The fork: ceasefire or escalation

President Trump is nearing a decisive fork in the Iran war, with U.S. and Israeli officials envisioning two viable endgames: pursue a new 10-day ceasefire to reopen the Strait of Hormuz, or launch a massive joint military campaign with Israel to force Tehran’s capitulation^[2]. Neither side has accepted the ceasefire proposal, which Qatar, Egypt, Pakistan, and Oman presented in recent days^[2].

At least three U.S. service members have been killed in the renewed fighting, and Trump said Monday he had ordered the Pentagon to make Iran pay “many times over” for every American death^[2]. The U.S. military has sent dozens of fighter jets and refueling aircraft to the region, assembling the forces needed for a major escalation^[2]. Israeli sources said the IDF is on high alert and preparing for a possible expansion of the war within days^[2].

A regional source told Axios that the White House may continue bombing Iran for several more days to avenge the deaths of the service members before seriously considering the proposal^[2].

A new targeting pattern: commercial tech infrastructure

Reports emerged on July 21 that Iran’s IRGC claimed responsibility for a cruise missile strike on what it described as Amazon’s central data hub in Bahrain, warning that more attacks on U.S. technology infrastructure would follow^[5]. If confirmed, this marks a shift in Iran’s targeting posture — from military assets and commercial shipping to the physical infrastructure of American technology companies operating in the Gulf. The IRGC reportedly warned 18 American tech companies by name^[5].

This development, if it holds, introduces a new category of corporate risk: cloud and data-center operators with physical presence in Gulf states could become deliberate targets in an escalatory scenario, widening the blast radius of the conflict well beyond oil and shipping.

What to watch next

• The ceasefire response window. Whether either side accepts the 10-day proposal within the coming days will determine whether Hormuz traffic stabilizes or falls further. If no response arrives by week’s end, markets will likely price in continued escalation.

• Houthi strikes on Yanbu. Any confirmed missile or drone strike on the Yanbu refinery or export terminal would take Saudi Red Sea exports offline and could push Brent toward or above $100, since both Hormuz and Bab el-Mandeb would be simultaneously impaired.

• U.S. tech infrastructure targeting. The reported Bahrain data-center strike, if verified, would extend the conflict’s corporate risk surface to cloud and technology companies with Gulf operations. Watch for evacuation orders, data-center redundancy moves, or insurance repricing for Gulf-based digital infrastructure.

• Wednesday’s earnings cluster. Alphabet, Tesla, and Texas Instruments report July 22^[5]. These results arrive against the backdrop of an AI capex narrative already under pressure from semiconductor pullbacks and rising Chinese competition. An oil-driven cost shock layered on top of AI spending uncertainty would test whether the two market stories — geopolitics and tech earnings — reinforce or offset each other.

• Inventory drawdowns. With global oil inventories approaching operational minimums, the buffer between the current $91 Brent and a supply-driven spike is thin. Weekly inventory data will indicate how much runway remains before the deficit translates into gasoline price increases for U.S. consumers — a variable that historically shapes presidential decisions on whether to escalate or de-escalate.