Hormuz Watch: When Tensions Eased, Airlines Rose 37% to 54%. Refiners Barely Moved.

Where the Series Leaves Off

The week ended with all three exits in view. On Thursday, President Trump said the U.S. would not attack Iran before the November 3 midterm elections, that the blockade "will remain in full force and effect," and that the two sides were "having productive discussions." The same day, The New York Times reported that U.S. planners had drawn up plans for three days of strikes. On Friday, Iran's foreign minister said Tehran was reviewing the U.S. response to its proposal to reopen the Strait of Hormuz within seven days. Meanwhile, Iranian attacks on tankers in the strait hit their highest level of the war last week.

Delta (DAL) reported on Friday morning and showed what the wait costs. Its third-quarter fuel price was $3.61 a gallon, against the $3.15 it assumed in July, and adjusted earnings came in at $1.72 a share, below its $2.00 to $2.50 guidance. Delta cut its 2026 forecast to $5.10 to $5.60 a share from $6.50 to $7.50, saying it was absorbing a $6 billion increase in fuel costs. Its refinery lowered its fuel cost by 13 cents a gallon in the quarter and is expected to lower it by about 40 cents in the fourth.

Also on Friday, Reuters reported, citing sources, that China is set to resume refined fuel exports after its October halt.

The Dashboard

Here is the dashboard one last time for this series. Crude through the strait is still Kpler's reading for the week to October 3; President Trump said this week that crude is flowing in record volumes, which Kpler's data does not show. The diesel margin jumped back to $115 on Wednesday as New York Harbor diesel rose 6% in a day.

• Crude through Hormuz10.3Mbbl/day76% of prewarWeek to Oct 3, the latest Kpler reading. Attacks on tankers hit a weekly high.Kpler via WSJ; Investing.com
• Refined fuel through Hormuz1.3Mbbl/dayDown 64%Week to Oct 3. Prewar: 3.6M a day.Kpler via WSJ
• Brent, now vs. December$126vs. $100Relief priced inPhysical cargoes vs. December futures, both Oct 7. Futures rose about 4% on Oct 8.EIA daily prices; futures settlement
• Diesel margin$115per bbl3.5x 2025Oct 7, as NY Harbor diesel rose 6% in a day. Oct 5: $98.EIA daily prices; our calculation
• Supertanker day rate$1.22Mper dayNearly 6x prewarGulf to China benchmark, Oct 2, the latest weekly reading.Baltic Exchange; Seatrade
• Pump diesel$6.20per galUp 67%National average, Oct 5. Next EIA update Oct 14.EIA weekly retail

Three Ways Out

Every exit from here is a version of one of three paths.

• A deal. Iran's seven-day reopening proposal and the "productive discussions" point this way. The closest precedent is this spring: from April 29 to June 24, as the sides moved toward the June deal, Brent futures fell 37.5%.
• A stalemate. The blockade stays, crude keeps moving at most of its prewar volume under attack, and refined fuel stays short. This has been the path since July.
• Escalation. Strikes, a closed strait or new damage to Gulf refineries. The precedent is the summer: from June 24, when the deal was in place, through the collapse of the ceasefire to this week.

The table below shows what every company in this series did in each of those windows, along with its move on the day of the April 8 ceasefire.

What Each Exit Did Last Time

Three patterns stand out.

• The payers moved the most when tensions eased. All five rose on the ceasefire day, by 4% to 8%. From April 29 to June 24, the four airlines rose 37% to 54% and Knight-Swift (KNX) 18%. In the flare-up since, the airlines gave back 9% to 27% and Knight-Swift 13%.
• The refiners barely moved when tensions eased. All five fell on the ceasefire day, by 4% to 7%. From April 29 to June 24, they ranged from down 6% to up 2%, while Brent futures fell 37.5%. A refiner earns the gap between fuel and crude, and that gap held up: the diesel margin averaged $58 a barrel in June, down from $67 in April but still nearly twice its 2025 average of $32. Then the refiners rose 67% to 121% in the flare-up.
• The tanker owners were mixed both ways. They rose 2% to 4% on the ceasefire day, ranged from down 3% to up 12% in the spring, and rose 12% to 40% since June, far less than the refiners. Part 2 showed why: the market prices the tanker boom as temporary.

If a Deal Lands

Last time, easing helped the payers most and the refiners least. Three things are different now.

• The refiners have more priced in. On April 29, refiner stocks were up 12% to 32% since the war began. Now they are up 82% to 151% and trade at about twice their 2022 multiples, as Part 3 showed. A deal would test that.
• China is coming back. Reuters reported Friday, citing sources, that China is set to resume refined fuel exports. If Chinese diesel and jet fuel return to Asian markets, the diesel margin could ease before any deal.
• Diesel is still last. The refinery repairs and the empty tanks outlast any deal. The EIA expects East Coast inventories of diesel and heating oil to stay 20% to 30% below average through the winter, and consultant data cited by Valero put diesel and jet fuel behind gasoline in the recovery.

For the tanker owners, a deal is the case Part 2 described: rates fall fast once the ships come back, as they did by 58% in five days in 2019. Their stocks have less to give back than the refiners': they held up through last spring's easing, and since the war began they have risen 11% to 61%, against 82% to 151% for the refiners. For the payers, a deal cuts the bill at the pump first, through gasoline, and last for heating oil and jet fuel. Delta's fourth-quarter guidance assumes it pays about $4.25 a gallon for fuel, refinery benefit included.

If the Stalemate Holds

This is the path of the past three months, and the numbers are already showing up in reports. Delta cut its 2026 forecast by about a quarter at the midpoint. The refiners report from October 22, with analysts expecting Valero (VLO) to earn $18.86 a share for the third quarter, half again its second-quarter result. The tanker owners keep booking six-figure day rates.

Within a stalemate, the supply of diesel can still change. Russia's ban on diesel exports by producers runs through October 31. The IEA agreed this week to speed up its emergency stock release, with diesel first in line. The September consumer price index, due October 14, will show how much of the fuel bill has reached consumers.

If It Escalates

Escalation looks like the summer again. From June 24 to this week, the refiners rose 67% to 121%, the tanker owners 12% to 40%, and the payers fell 9% to 27%. The physical market is already pricing tight supply. Brent cargoes traded at $126 on Wednesday, about $26 above December futures. On October 2, the day after Yanbu, Saudi Arabia's Red Sea oil hub, was struck, they reached $135.51, within $3 of their high of the war: $138.21 on April 7, the day before the ceasefire.

On Thursday, Brent futures settled about 4% higher, above $104, after reports of U.S. strike plans, more tanker attacks and the hurricane in the Gulf of Mexico. They fell about 1% early Friday, as the President's comments on talks eased supply concerns, Reuters reported. For the U.S. refiners in this series, new damage to Gulf refineries would likely keep the margin high for longer, because repairs take months, as Part 3 showed.

What to Watch

• Iran's answer. Tehran said Friday it is reviewing the U.S. response to its seven-day reopening proposal.
• November 3. President Trump said the U.S. would not attack Iran before the midterm elections.
• October 31. Russia's ban on diesel exports by producers expires unless it is extended.
• China's export approvals. Reuters reported Friday that China is set to resume refined fuel exports.
• October 14. The September consumer price index and the EIA's next retail fuel prices.
• October 22 to November 3. Third-quarter results from Valero (October 22), Phillips 66 and HF Sinclair (October 28), PBF (October 29) and Marathon (November 3).
• The Gulf of Mexico. Hurricane Isaias shut in about 1.3 million barrels a day of U.S. offshore crude production this week, Bloomberg reported.

What the Wealth Engine Scores Say

Before the bottom line, here is the latest Wealth Engine Pro platform reading for all 15 companies in one place. Full score boxes for each company appear in Parts 2 to 4.

Across the series, the scores rank the three groups in a clear order: tanker owners first, refiners second, payers last. Four of the five tanker owners score Strong on Company Strength. All five refiners score Moderate. The payers score lowest, with American and Knight-Swift rated Weak. Ten of the fifteen carry a Bullish outlook and four are Neutral; American's is Bearish.

These scores are systematic. They evaluate companies based on reported financials, balance sheet quality, moat characteristics, and valuation models (DCF, peer comparison, earnings power). They measure what a company is today, not what it might become. That is by design: the scoring system is built to keep emotion and forward speculation out of the numbers.

This article is doing something different. It is making an editorial argument about how each company would fare under three different endings to the war, which no score built from reported financials can see in advance.

Both perspectives are real data. The platform ranks the tanker owners as the strongest businesses in this series and the payers as the weakest. The article argues that the next move depends on which exit comes, and that last spring and summer are the best map available. Transparent investors use both.

The Bottom Line

Five days, one barrel. Crude came back first. The ships earned a fraction of the headline rate. The refiners collected a margin the market expects to last. And the bill rolled downhill to the people who cannot pass it on.

The stocks have already shown how they react to each exit. When tensions eased last spring, the payers rallied hardest and the refiners barely moved. When tensions flared, the refiners rose 67% to 121% and the payers fell. This week, a deal proposal, a blockade and a strike plan were all on the table at once, and the stocks in this series are positioned for different answers.

This watch runs on one habit: find the chokepoint, follow the price. Hormuz Watch returns when the readings move.