The Refiner Earnings Supercycle Has Begun: History Says Buy These 5 Stocks Before It's Too Late

The Iran-U.S. war has likely triggered the conditions for a full refiner earnings supercycle.

After Wednesday’s International Energy Agency announcement that its 32 member nations would release 400 million barrels of emergency strategic reserves — the largest coordinated release in the IEA’s 51-year history — energy markets resumed their climb.

Brent crude topped $93 a barrel and WTI advanced 6.1% to $88.56.

But something extraordinary is happening in the fuel market.

The Crack Spread — And Why It Changes Everything

The crack spread is the margin a petroleum refiner earns by processing crude oil into saleable fuel products. It is calculated as the difference between the market price of the refined product and the cost of the crude feedstock.

When the crack spread widens, refiners earn more per barrel processed. What is driving spreads today is an active military conflict with no resolution timeline and a maritime chokepoint that carries one-fifth of global seaborne oil trade.

RBOB gasoline futures currently trade at $2.78 a gallon, or approximately $116.76 a barrel — one barrel contains 42 gallons. Against WTI crude at $88.56, that implies a gasoline crack spread of roughly $28 a barrel.

Gasoline demand, while affected by higher prices, is relatively elastic: consumers drive less, shift routes, consolidate trips. The market adjusts.

Diesel tells a different story entirely.

Ultra-Low Sulfur Diesel futures trade at $3.70 a gallon — approximately $155 a barrel. Against the same WTI crude input, the diesel crack spread is roughly $67 a barrel.

The all-time record, set in October 2022 at the peak of the European distillate crisis following Russia’s invasion of Ukraine, was $83 a barrel. The current spread sits at 78% of that record — and it is still accelerating.

The diesel crack is up approximately 60% month-to-date, on pace for the largest monthly percentage increase since Hurricane Katrina knocked out roughly 15% of U.S. refining capacity in August 2005.

Diesel powers the sinews of the physical economy — long-haul trucking, container shipping, agricultural machinery, construction equipment, military logistics.

Diesel demand is structurally inelastic: when supply is constrained, prices rise until physical inventory is rebuilt — not until consumers change behavior.

That is precisely what makes the current spread so durable.

The Margin Math For US Refiners – And The $260B Potential Earnings Windfall

The overall petroleum refining capacity of the United States totaled 18.4 million barrels per day in 2025, or 6.6 billion barrels in a year.

Applying the current blended crack spread of $40 per barrel, U.S. refining capacity implies roughly $268 billion in annualized gross refining margin potential across the industry.

In a conservative scenario, where the blended crack normalizes to $25 a barrel as some supply disruption eases, that figure remains approximately $168 billion.

Either number represents a generational windfall for the industry.

Which Refining Stocks Gain Amid Widening Crack Spread

1. Marathon Petroleum Corporation (NYSE:MPC), with 13 refineries and approximately 3.0 million barrels per day of capacity operating at 94% utilization in 2025, is the largest single capture vehicle. Marathon’s earnings sensitivity to the crack spread is unmatched in absolute dollar terms. At a $40 blended crack, Marathon’s annualized gross refining margin reaches approximately $41.2 billion. At the conservative $25 scenario, that figure stands at approximately $25.7 billion — still a record-caliber earnings run rate for the company.
   
2. Valero Energy Corporation (NYSE:VLO) earns the crack spread twice. When diesel cracks explode, Valero captures both streams simultaneously — making it the single most diesel-levered name in large-cap U.S. refining, and historically the strongest performer across full crack spread cycles. Valero earns the crack spread twice. Approximately 40% of its production across 15 refineries — representing roughly 2.94 million barrels per day of effective capacity — is distillates. At a $40 blended crack, Valero’s conventional refining operations alone generate approximately $42.9 billion in annualized gross margin. At $25, that base stands at $26.8 billion.
   
3. Phillips 66 (NYSE:PSX) with 12 refineries and approximately 1.9 million barrels per day of capacity — an effective throughput of roughly 1.86 million barrels at current utilization — Phillips 66 would generate an estimated $27.1 billion in total gross refining margin at a $40 crack, and approximately $17.0 billion at $25. The critical distinction is that refining accounts for only roughly 30–35% of Phillips 66’s overall earnings. The remainder flows from CPChem — its 50/50 chemicals joint venture with Chevron — and a substantial midstream business. That diversification dilutes crack spread sensitivity relative to pure-play peers, but provides a meaningful earnings floor when product margins compress.
   
4. HF Sinclair Corporation (NYSE:DINO), with approximately 700,000 barrels per day concentrated in Rocky Mountain and inland markets, serves the highest-diesel-intensity demand base in U.S. refining: agriculture, mining and long-haul trucking. Those customers do not substitute away from diesel. At a $40 blended crack, HF Sinclair’s annualized gross refining margin reaches approximately $9.2 billion. At the conservative $25 scenario, the figure is approximately $5.7 billion.
   
5. PBF Energy Inc. (NYSE:PBF) is the most leveraged pure-play in U.S. independent refining. With six refineries processing approximately 900,000 effective barrels per day, PBF has no midstream income, no chemicals segment, and no MLP earnings to cushion crack spread variability. It earns the spread and nothing else. At a $40 blended crack, PBF’s annualized gross refining margin approaches $13.1 billion – that’s three times its current market capitalization. At the conservative $25 scenario, that figure remains approximately $8.2 billion, twice the company’s current market cap. PBF’s East Coast refineries — Delaware City, Paulsboro and Toledo — serve the Northeast heating oil and industrial diesel market now experiencing the sharpest supply tightness in the current disruption.

The Historical Playbook

Two major episodes in the past two decades illustrate how extreme tightening in refined fuel markets can translate into powerful equity gains for oil refiners.

The first occurred between June 2004 and September 2005, when a combination of forces severely constrained global fuel supply.

Rapid industrial demand from a fast-growing Chinese economy collided with structural underinvestment in U.S. refining capacity — no new full-scale refinery had been built in the United States since 1976.

The situation deteriorated further after Hurricanes Katrina and Rita crippled large portions of Gulf Coast refining infrastructure.

The result was a sharp tightening in refined product markets, sending crack spreads to then-record levels.

Diesel crack spreads spiked from roughly $2.1 to $23 per barrel, while gasoline crack spreads rose from $14 to $21. Refining equities responded dramatically, with Valero Energy rallying 239% and HF Sinclair climbing 265% during the period.

The second episode unfolded between March and November 2022, following Russia's invasion of Ukraine. Europe suddenly lost access to large volumes of Russian diesel, forcing buyers to replace that supply with imports from the U.S. Gulf Coast and India at significantly higher prices.

At the same time, the global diesel market was already structurally tight after refinery closures during the COVID-19 pandemic.

Diesel crack spreads jumped from $27 to $60 per barrel, eventually reaching $83 in October 2022, which remains the historical peak. Gasoline cracks were broadly flat over the period but extremely volatile, briefly touching $60 in August 2022, the highest level ever recorded.

Refining stocks again responded strongly, with HF Sinclair gaining 106%, Valero Energy rising 58%, and Marathon Petroleum advancing 53%.

Episode	Period	Diesel Crack (Start → Close)	Gasoline Crack (Start → Close)	Refining Stock Performance
Episode 1: Global Fuel Tightness	Jun 2004 – Sep 2005	$2.1 → $23	$14 → $21	Valero +239%, HF Sinclair +265%
Episode 2: Post-Ukraine Diesel Shock	Mar 2022 – Nov 2022	$27 → $60 (→ $83 Oct 2022 peak)	~flat overall, peak $60 Aug 2022	HF Sinclair +106%, Valero +58%, Marathon Petroleum +53%

The Anatomy Of a Supercycle

Both prior episodes shared the same underlying architecture: a supply-side shock constrained refined product availability faster than demand could adjust, crack spreads exploded, and refining equities delivered returns that bore no resemblance to what the broader market produced over the same period.

The 2004–2005 cycle ran 15 months. The 2022 cycle ran eight.

Today, the diesel crack stands at roughly $65 a barrel — 78% of the October 2022 all-time record of $83, and still climbing. It is up 60% in 11 days of trading. The gasoline crack, at $28, is elevated but secondary.

The refiner earnings supercycle does not require $200-a-barrel oil to produce extraordinary equity returns.

The IEA’s 400-million-barrel disbursement — the largest in its 51-year history — produced a 6% rally in oil prices on the day of the announcement. Markets are not pricing a resolution. They are still pricing the continuation of a war.

Photo: Jonathan Weiss via Shutterstock