Hormuz at 11% Capacity: Why the Strait's Collapse Is Now a Sanctions Problem, Not Just a War Story

The Strait of Hormuz has effectively stopped flowing. For three consecutive days through July 19, no oil tankers passed through the waterway that once carried roughly one-fifth of global crude and a fifth of the world’s liquefied natural gas.^[1] Real-time tracking data shows daily transits at roughly 10 vessels — about 11% of the pre-war average of nearly 140 ships per day — with 380 vessels waiting and insurance coverage withdrawn for most commercial carriers.^[1] The crisis has moved past a military escalation and is now reshaping global energy flows, shipping economics, and the legislative calendar in Washington.

Nine Nights of Strikes and a Ceasefire That Didn’t Hold

The current phase of the US-Iran war began when a brief June 17 ceasefire collapsed over the weekend of July 12–13.^[2] The US carried out strikes on more than 80 targets inside Iran, prompting Iran’s Revolutionary Guard to reassert control over the Strait of Hormuz.^[2] Since then, US Central Command has conducted nine consecutive nights of airstrikes targeting Iran’s Revolutionary Guard infrastructure, bridges, electrical facilities, and coastal defense systems.^[3]

The trigger for the latest round was an Iranian missile attack on a US airbase in Jordan that killed two American service members, with one still missing and four hospitalized.^[3] Iran has widened its retaliation beyond US forces, hitting Bahrain, Jordan, Kuwait, and firing missiles toward the Jordanian port city of Aqaba, prompting Israel to warn of potential spillover.^[3] Kuwait reported a second attack on a water desalination plant in two days — critical infrastructure given that roughly 90% of the country’s drinking water comes from desalination.^[3]

On July 14, the US formally reimposed a naval blockade on Iranian ports.^[2] President Trump briefly proposed a 20% toll on all cargo transiting the strait — a plan the International Maritime Organization rejected within hours, with Secretary-General Arsenio Dominguez stating the organization has “always been consistent” in opposing charges for passage through international straits.^[2] Trump abandoned the fee demand on July 15, though the blockade and military campaign continued.^[2]

Oil Repricing a Persistent Disruption, Not a Short Shock

Brent crude surged 9.6% on July 14 alone to close at $83.30 a barrel — the benchmark’s best single-day performance since May 2020 — and continued climbing, reaching $86.19 as strikes hit Iranian military targets near Bandar Abbas and Qeshm Island.^[2][4] WTI rose 9.4% the same day to $78.14.^[2] By the weekend, after a US Treasury license revocation for Iranian crude and renewed tanker attacks, both benchmarks were up more than 5% from prior settlements, with Brent September futures near $76 and WTI settling at $70.44 before the next leg higher.^[5]

The price signal is telling a specific story: markets are pricing a persistent flow constraint, not a brief disruption. Saul Kavonic, head of energy research at MST Financial, said shipping traffic would likely remain below 50% of pre-war levels for an extended period.^[2] Analysts project a 10% to 25% oil premium if Hormuz disruptions persist, with a full closure viewed as a much larger risk event.^[4]

Energy stocks moved in lockstep. As of the July 17 close, ExxonMobil (XOM) traded at $147.39, up 0.99% on the day; Chevron (CVX) at $187.36, up 1.90%; ConocoPhillips (COP) at $114.71, up 1.66%; and the US Oil Fund (USO) at $123.96, up 3.91% — reflecting the sharpest move among the group as crude prices repriced the blockade’s supply impact.^[6]

The market’s alpha is sitting in energy, not defense. The NYSE Arca Defense index fell nearly 8% in March versus the S&P 500’s 5% decline, suggesting investors already priced in much of the conflict premium earlier in the war.^[4] Strategists note that defense valuations absorbed the initial shock months ago, while energy is still working through a physical disruption story that keeps deepening.^[4]

The Sanctions Bill: From Russia to Iran

The legislative dimension is where this story pivots from a military event to a structural one. On July 14, US senators unveiled a sweeping bipartisan Russia sanctions bill — more than 60 pages — that would impose mandatory sanctions on Russian political and military leaders, oligarchs, state-owned enterprises, and foreign companies supporting Russia’s defense industrial base.^[7] The bill also targets Russia’s shadow fleet, energy projects, and financial institutions, and would impose up to a 100% tariff on the top five countries — including China and India — purchasing Russian crude oil and natural gas.^[7]

The bill carries emotional and political momentum. Its late co-author, Senator Lindsey Graham, announced White House agreement on the bill just a day before his sudden death.^[7] Democratic Senator Richard Blumenthal, a key backer, said he believed it could pass “before August,” with more than two dozen co-sponsors and growing.^[7]

Then on July 19, President Trump called on Congress to add Iran to the Russia sanctions bill, saying “that’s what Lindsey wanted.”^[8] The push came after Iranian attacks in Jordan killed two US service members.^[8] Blumenthal cautioned against expanding the bill’s scope, noting it already contains secondary sanctions affecting Iran through the Russian defense industrial base,^[7] but the political pressure from the White House and the escalating conflict makes some form of Iran provisions likely.

If the combined bill passes with Iran provisions, it would extend the sanctions framework from a Russia-only regime to a dual-track pressure system affecting two of the world’s major energy suppliers simultaneously. For markets, that means the Hormuz disruption — already a physical supply shock — would be reinforced by a legal supply shock, closing off Iranian crude not just through blockade enforcement but through secondary tariff mechanisms targeting its buyers.

Iran’s $6 Billion Buffer and the Sanctions Waiver That Ended

A revealing detail emerged about the brief ceasefire’s economic consequences. During a two-week US sanctions waiver under the interim deal, Iran moved roughly 70 million barrels of crude to Asia in 16 days, securing up to $6 billion in revenue before Washington pulled the plug on the license six weeks before its August 21 expiry.^[9] That buffer gives Tehran a financial cushion as the conflict resumes — but it also means Iran’s leadership has a concrete sense of what it stands to lose if the blockade holds.

The Treasury’s revocation means no new transactions for Iranian oil may take place, changing the legal flow of barrels rather than just market sentiment.^[5] Refiners can adjust runs and sourcing faster than downstream industrial users can reroute plants, which is why crude leads the repricing and LNG follows more slowly behind long-term contracts.^[5]

Shipping: The Worst-Case Scenario Materializes

The maritime picture has deteriorated to what industry leaders describe as a worst case. At least nine ships have been attacked since July 6, according to the International Maritime Organization.^[1] A maritime risk CEO told Moneycontrol that “nobody is willing to move” through the strait, with Iran’s ship attacks pushing Hormuz into the worst-case scenario.^[1] On July 11, only six vessels crossed during a 12-hour window.^[2] By Thursday, exactly three commodity vessels made it through.^[1]

Shipping companies are refusing even the US-military guided transits through the protected southern corridor along Oman’s coast.^[10] Reuters reported that carriers are halting Hormuz transits amid severe security alerts, with fears rising about the Bab el-Mandeb strait at the other end of the Red Sea as well.^[10] Iran has demanded that vessels use a northern route through its territorial waters, asserting a claim of control over the strait that the US and its allies reject.^[2]

NPR’s reporting framed the broader stakes: recognizing Iran’s control over Hormuz could set a dangerous precedent, with other countries potentially claiming control over the Strait of Gibraltar, the Malacca Strait, or the Taiwan Strait.^[11] As Windward CEO Ami Daniel noted, Russia could restrict the Northern Passage, or China could restrict Taiwan Strait transits — the unraveling of freedom of navigation at Hormuz is not an isolated problem.^[11]

What to Watch Next

The indicators that matter now are not all on the battlefield. Here is what could deepen or unwind the current pricing:

Deepening signals: - Congressional passage of a combined Russia-Iran sanctions bill with Iran provisions before August, adding a legal supply shock on top of the physical blockade.^[7][8] - Continued zero-tanker days through Hormuz, which would shift market pricing from “disrupted” to “structurally closed” and push the 10–25% oil premium thesis toward its upper bound.^[4][1] - Any disruption to Bab el-Mandeb traffic via Iran’s Houthi allies, which would put two major energy shipping routes at risk simultaneously.^[4] - Damage to Iranian export infrastructure such as Kharg Island, which would extend the disruption from transit to production.^[5]

De-escalation signals: - A credible diplomatic path that lowers transit risk — the interim deal’s 60-day negotiation window has passed its halfway point, and an Iranian negotiator has already suspended Tehran’s commitments.^[3] - Sustained recovery of Hormuz transit volumes above 50% of pre-war levels, which would signal the market should treat the disruption as temporary.^[2] - Brent failing to hold above $85 and energy stocks rolling over, which would suggest the market is pricing de-escalation before the headlines confirm it.

The base case remains higher oil and elevated energy sector outperformance unless diplomacy credibly reduces transit risk. The confluence of a collapsing ceasefire, a blockade, zero tanker days, and a sanctions bill with Iran provisions moving through Congress means this is no longer a headline shock to fade. It is a repricing of how global energy flows work — and the legislative timeline in Washington may matter as much as the military timeline in the Gulf.

FN2 Research provides financial research and education, not personalized investment advice. All scenarios are hypothetical. Past performance does not guarantee future results.