The ceasefire lasted three days. That is it.
The Islamic Revolutionary Guard Corps launched multiple ballistic missiles from Iranian territory in what CENTCOM characterized as a surprise assault on American military personnel stationed in the Middle East. U.S. forces managed to shoot down all incoming missiles. But the damage to oil markets was immediate and real.
Brent crude futures gained 7.9% to close at $90.74 a barrel on Wednesday. WTI advanced 6.6% to settle at $84.46 per barrel. That is not a rounding error. That is one of the sharpest single-session moves in months, and it happened the day before today’s issue.
Here is where I’m at: this conflict is not new, but the market’s complacency definitely was. Benchmark Brent futures, which briefly topped $100 a barrel last week following the collapse of the U.S.-Iran ceasefire, had been falling in recent days as the U.S. paused its bombing campaign to reassess strategy, hitting a two-week low of $84.09 on Tuesday. Then Wednesday happened.
Why the Strait of Hormuz Is the Only Number That Matters
Most investors know the name. Fewer understand the math.
The Strait, which borders Iran and Oman, is a key waterway for the transit of oil, natural gas, and other commodities including helium, fertilizers, and industrial products. Roughly 27% of the world’s maritime trade in crude oil and petroleum products moves through it. There is no pipe big enough, no reserve release fast enough, to fully replace that volume on short notice.
U.S. and Israeli military operations against Iran since February 2026 and subsequent Iranian military action throughout the Persian Gulf have raised concern about oil and natural gas markets. Starting on March 4, Iranian forces declared the Strait “closed,” threatening and carrying out attacks on ships attempting to transit.
The conflict has already produced price history that nobody expected. By the end of March, the Brent price had increased by about 65% to record its highest monthly rise ever, amid pronounced volatility. The S&P 500 hit its lowest point for the year in late March, just before Brent spot prices peaked above $125 a barrel in early April. Things calmed briefly. Now they aren’t calm again.
The structural problem is shipping, not just supply. War risk insurance protection and indemnity cover was cancelled for Gulf transits from March 5. Ships that attempt the strait now operate without standard P&I cover. Most owners and operators refuse to take that risk. War risk premiums have surged to multi-year highs on any route touching the region. Even when the guns go quiet, the economics of actually transiting that waterway remain broken.
The fragile ceasefire has yet to convince shippers to risk the narrow Hormuz Strait, the critical chokepoint that carries about 20% of the world’s oil supply. The Strait may be officially “open,” but for the moment it is still operating more like a high-risk exclusion zone than a normal shipping lane.
Can Oil Get Back to $100?
It already did once. The question is whether it gets there again — and stays.
Goldman Sachs laid out the scenario clearly back when this started. In a more severe case, oil flows through the Strait of Hormuz are cut by 50% for one month and stay down 10% for another eleven months. That scenario could cause Brent to spike briefly to $110 a barrel before moderating. Goldman estimates the risk premium embedded in oil’s price structure would peak at just over $25 a barrel in this scenario.
The World Bank sees it differently, but not much more comfortably. Under current conflict conditions, the average Brent price in 2026 could fall in a range from $95 to $115 a barrel, about 10 to 35% higher than the baseline.
What’s interesting is how quickly the buffers that suppressed oil through the ceasefire phase are getting used up. As of early June, Dated Brent was trading near $96 to $98 a barrel, having peaked above $140 in the early conflict phase before retreating sharply. That retreat happened because of strategic reserve releases and a U.S. export surge. American crude and fuel exports in May 2026 were more than 2 million barrels per day higher than the full-year 2025 average. The Trump administration also deployed the Strategic Petroleum Reserve at an aggressive pace, committing to release 172 million barrels as part of a coordinated advanced-economy response. Those buffers have limits. After five months of conflict, governments’ and private industry’s oil inventories have largely been drawn down.
The IEA’s verdict is hard to argue with. The conflict has caused the restriction of nearly all traffic through the Strait of Hormuz, leading to what the International Energy Agency characterized as the “largest supply disruption in the history of the global oil market.” That framing matters. When you’re already operating in record territory, the next escalation doesn’t have a playbook.
The Sectors That Win
Two sectors benefit from this environment. One directly, one structurally.
Energy producers: Defense giants are emerging as relative winners from the Iran war and the oil shock roiling global markets, with investors flocking to the largest U.S. primes as hedges against escalating conflict and inflation risk. But on the pure energy side, the positioning is nuanced. U.S. domestic producers carry an additional advantage: their supply chains are geographically insulated from Hormuz physical risk, making them perceived as comparatively safe beneficiaries of Middle East supply anxiety.
EOG Resources went into 2026 completely unhedged, which means shareholders get full, undiluted exposure to every dollar oil climbs. That cuts both ways. But in a re-escalation environment, unhedged upstream exposure is exactly what a trader wants. Refiners have also had a moment. Wall Street now models Valero earning more than $7 a share for the quarter, and the stock has ripped more than 40% in 2026 to all-time highs.
Defense contractors: This is the other trade. Kratos Defense surged 10.10% while Lockheed Martin and RTX climbed 6.67% and 6.58%, respectively, in Monday pre-market trading when war escalated in early March. U.S. and Israeli strikes on Iran and Tehran’s subsequent retaliation triggered a rally in defense stocks, as investors anticipated a rise in defense spending due to expected prolonged regional instability. Every re-escalation refreshes that thesis. Missiles are being used. That means missiles need to be replaced. Backlogs go up, not down.
The Sectors That Lose
Airlines are the clearest victim here. Not ambiguously. Not “it depends.” The math is direct.
United Airlines already disclosed $6 billion in incremental 2026 fuel costs above year-start expectations. And oil has climbed further since that disclosure. IATA projects airline net profit will fall to $23 billion this year, reducing the industry’s net margin to 2%, the weakest level recorded since the global health crisis. The disruption removed approximately 10 million barrels per day of crude oil supply from global markets.
The aviation sector has been hit particularly hard, with jet fuel prices roughly doubling since late February. Hormuz-linked flows account for about one-fifth of global seaborne jet fuel trade. There is no easy offset to that. Airlines can raise fares, but competitive pressures and concerns about weakening consumer spending limit their ability to pass on additional fuel costs to consumers.
Tanker operators are an interesting exception inside the broader shipping category. When strategic maritime corridors face elevated threat perception, two forces simultaneously lift tanker operator economics: higher spot freight day rates driven by route uncertainty and elevated demand, and rising war-risk insurance premiums that charterers absorb. The shippers who can navigate — literally and figuratively — around the Hormuz constraints may actually benefit from the premium rates.
Slight tangent, but it matters: the fertilizer story keeps getting ignored. The Strait carries helium, fertilizers, and other industrial products to world markets. Agricultural input costs have consequences that run far beyond energy equities.
The Risk Assessment
The bull case for oil — and energy stocks — rests on the ceasefire staying broken. The flare-up on multiple fronts, after several days of relative calm, raised the risk of a return to all-out war. It also underscored the difficulty of winding down a five-month conflict that has jolted the world economy.
The bear case is equally real. Every temporary ceasefire has compressed oil prices fast. Oil prices had eased back toward $70 a barrel before this week’s escalation, but analysts warned the market may be underestimating lingering shipping risks and the demand to rebuild depleted inventories. Strait of Hormuz shipping is unlikely to rebound quickly to pre-war levels, as companies grapple with unclear ceasefire terms, higher insurance costs, and mine risks. Even when peace eventually arrives, the physical infrastructure damage and shipping behavior changes won’t reverse overnight.
The Fed is also in the frame. A hawkish Fed meeting landed yesterday alongside the missile strike. Historically, a large and sustained oil price spike of at least 50 to 100% that persists over several months, or a sharp hawkish pivot from central banks to fight resulting inflation, are conditions that can generate meaningful equity selloffs. Both forces are now present simultaneously. That is not a comfortable combination.
Trader’s Checklist
Here is what to monitor before acting on any of this:
- Brent above $95 on a closing basis. That level re-establishes the pre-ceasefire fear premium and signals the market believes the breakdown is durable, not episodic.
- Baltic Dirty Tanker Index direction. Tracking the Baltic Dirty Tanker Index over coming weeks will signal whether elevated freight dynamics are embedding at a fundamental level or remaining episodic.
- Strait of Hormuz daily crossing counts. Kpler data showed 12 confirmed Hormuz crossings on July 28. Any sustained move below 8 to 10 per day means the physical disruption is re-intensifying.
- Trump’s retaliation timeline. Further oil price increases were expected as President Trump vowed to retaliate against Iran for the ballistic missile attack on a U.S. military base in Jordan. The scope and timing of that response sets the next price range.
- Defense earnings in August. Defense contractors Lockheed Martin and Northrop Grumman are seeing surging demand for missile defense and stealth programs. Upcoming Q2 reports will show whether the order acceleration is showing up in guidance, not just rhetoric.
- Airline fuel cost hedging disclosures. Any carrier that reports or updates guidance in the next week gets an immediate read on how much of the current oil spike is already embedded in forward cost estimates versus still in front of them.
What matters most right now is that the easy part of the Hormuz trade — buying the obvious spike — is over. The next move requires a view on durability. A ceasefire that lasts three days before breaking is not a ceasefire. It is a pause. Plan accordingly.
