The Barrels That Cost the LeastNarrow moat

ExxonMobil (XOM) — moat facet

A price-taker can own exactly one thing — the cost of the next barrel — and ExxonMobil found half of it in Guyana and paid sixty-three billion dollars for the other half.

There is exactly one durable advantage available to a company that cannot set its own price, and it is to be further down the cost curve than the marginal producer. Everything else in an oil company's strategy is a variation on that sentence.

Upstream capital employed and what it returns, 2025$118.1bnUS Upstream capital$91.8bnNon-US Upstream capital4.3%US return17.7%Non-US returnCapital in $bn; returns in per cent. Same commodity, thirteen points apart.
The larger pool of upstream capital earns a quarter of what the smaller one earns.

ExxonMobil's version has two names. Guyana is the larger one: the Stabroek block, which ExxonMobil operates with a 45 per cent interest, went from a discovery in 2015 to installed capacity above 900,000 barrels a day by late 2025, when the Yellowtail development started up on the ONE GUYANA floating production vessel1. Uaru and Whiptail follow, Hammerhead was funded in 2025 and is expected in 2029, and the company anticipates eight production vessels on the block by the end of 20302. The second is the Permian, where production averaged a record 1.6 million oil-equivalent barrels a day in 2025, four hundred thousand higher than the year before, with a stated target of roughly 2.5 million by 20303.

The returns tell you which is working. Upstream outside the United States — Guyana, Qatar, Kazakhstan, Canada, the North Sea — employed $91,792 million of capital in 2025 and earned 17.7 per cent on it. Upstream in the United States employed $118,142 million and earned 4.3 per cent4. Both businesses sell into the same world price. The difference is entirely what the barrels cost to find and lift, and how much was paid for the ground they sit under.

That second clause is the uncomfortable one. ExxonMobil did not discover most of its Permian position; it bought it, for 545 million of its own shares worth $63 billion in May 20245. Guyana it found. A discovery costs exploration dollars and takes fifteen years; an acquisition costs the market price of proved reserves and takes a shareholder vote. The first builds a cost advantage and the second buys production at a price that already reflects it.

What the advantage is worth can be stated exactly, because the company states it. Unit earnings excluding special items are projected to exceed $15 a barrel by 2030, roughly three times the 2019 level, and total production is expected to reach 5.5 million oil-equivalent barrels a day, about thirty per cent higher than the next closest international oil company6. If that happens it is a genuine widening of the moat, because a low-cost producer survives prices that close a high-cost one.

The facet is rated narrow and its trajectory is widening, and both halves of that are deliberate. The cost position is getting better: Guyana grows, the Permian scales, and the divested tail is gone. It is still a narrow moat, because a cost advantage in a commodity is a relative position that competitors are actively working to erode, and because the barrel is sold at a price set by a cartel with three million barrels a day of spare capacity7.

Grade this on the return gap between the two halves of Upstream. Non-US at 17.7 per cent against US at 4.3 per cent is a thirteen-point spread inside one company, one segment and one commodity8. If the American half does not close most of that gap as Permian volumes scale, the sixty-three billion dollars bought production rather than an advantage.

Moat trajectory: Widening

This is the part of ExxonMobil that is genuinely improving. Guyana went from first oil in 2019 to installed capacity above 900,000 barrels a day in 2025 with four more vessels to come, the Permian set a record at 1.6 million oil-equivalent barrels a day, and the divested tail is gone. The company expects 5.5 million barrels a day by 2030, about thirty per cent above the next closest international oil company. The widening is in the cost position rather than in the return, which is the honest qualification.

The number that tests this moat
Reported
Upstream return on capital, US vs non-US
4.3% against 17.7%

The same commodity, the same company, the same year, thirteen points apart. Non-US is Guyana, Qatar, Kazakhstan and Canada; US is mostly the Permian, where capital employed rose $33 billion in 2025. If the American half is not clearly above the corporate cost of capital by 2028 with Permian volumes near target, the sixty-three billion dollars bought production rather than an advantage.

Source: Exxon Mobil Corporation Form 10-K, fiscal year 2025 ↗
Aspects of the moat
DIG DEEPER 01
Guyana: Forty-Five Per Cent of the Best Barrel Found This Century
A discovery in 2015 is 900,000 barrels a day in 2025, and it is the reason one half of Upstream earns 17.7 per cent while the other earns 4.3.
DIG DEEPER 02
The Permian, and What Sixty-Three Billion Bought
Record volumes, industry-leading execution, and 4.3 per cent on a hundred and eighteen billion dollars of capital.
DIG DEEPER 03
Reserves Are a Statement About Price
Nineteen point three billion barrels is not a measurement, it is a calculation at an assumed price — and the price changes every year.
DIG DEEPER 04
Advantaged Volume, and What It Is Actually Worth
The company publishes the scoreboard: price minus six point one billion, everything management did plus three point three.
⚠ Threats to the moat
⚠ THREAT 01
Six Billion Lost to Price, Three Billion Won Back by Effort
Two dollars lost to the market for every dollar won back by effort, in the best operating year the company has had.
⚠ THREAT 02
The Money Went to the Half That Earns Four Per Cent
Thirty-three billion dollars of new capital went into the half of Upstream that returns 4.3 per cent, and the half that returns 17.7 got none of it.
References
  1. ReportedGuyana is the larger one: the Stabroek block, which ExxonMobil operates with a 45 per cent interest, went from a discovery in 2015 to installed capacity above 900,000 barrels a day by late 2025, when the Yellowtail development started up on the ONE GUYANA floating production vessel.
    ExxonMobil news release, 'ExxonMobil Guyana begins production at fourth offshore Guyana project' — start-up of the Yellowtail development on the ONE GUYANA floating production, storage and offloading vessel, taking installed capacity on the Stabroek block above 900,000 barrels of oil per day, and the subsequent ramp toward 250,000 barrels a day. — August 2025 · publ. 8 August 2025 · source ↗
  2. ReportedUaru and Whiptail follow, Hammerhead was funded in 2025 and is expected in 2029, and the company anticipates eight production vessels on the block by the end of 2030.
    Exxon Mobil Corporation Form 10-K for FY2025, Management's Discussion and Analysis — Business Results: segment financial results and identified items, the 2025 earnings driver analyses for each segment, and the Upstream highlights covering the Permian, Guyana, LNG and the major project portfolio. — FY2025 · publ. February 2026 · source ↗
  3. ReportedThe second is the Permian, where production averaged a record 1.6 million oil-equivalent barrels a day in 2025, four hundred thousand higher than the year before, with a stated target of roughly 2.5 million by 2030.
    Exxon Mobil Corporation Form 10-K for FY2025, Management's Discussion and Analysis — Business Results: segment financial results and identified items, the 2025 earnings driver analyses for each segment, and the Upstream highlights covering the Permian, Guyana, LNG and the major project portfolio. — FY2025 · publ. February 2026 · source ↗
  4. ReportedUpstream in the United States employed $118,142 million and earned 4.3 per cent.
    Exxon Mobil Corporation Form 10-K for FY2025, Business Profile (Financial) — earnings after income taxes, average capital employed, return on average capital employed and cash capital expenditures for each segment and geography, and the corporate total. — FY2025 · publ. February 2026 · source ↗
  5. ReportedExxonMobil did not discover most of its Permian position; it bought it, for 545 million of its own shares worth $63 billion in May 2024.
    Exxon Mobil Corporation Form 10-K for FY2025, notes to the consolidated financial statements — Note 3 Disclosures about Segments and Related Information (segment revenue, intersegment revenue, segment income, additions to property plant and equipment, total assets, geographic revenue and the revenue-from-contracts disaggregation), Note 7 Litigation and Other Contingencies, and Note 20 Mergers and Acquisitions covering Pioneer Natural Resources and Denbury. — FY2025 · publ. February 2026 · source ↗
  6. ReportedUnit earnings excluding special items are projected to exceed $15 a barrel by 2030, roughly three times the 2019 level, and total production is expected to reach 5.5 million oil-equivalent barrels a day, about thirty per cent higher than the next closest international oil company.
    ExxonMobil news release, 'ExxonMobil raises its 2030 Plan' — $25 billion of earnings growth and $35 billion of cash flow growth by 2030 at constant prices and margins, production of 5.5 million oil-equivalent barrels per day about 30% above the next closest international oil company, unit earnings above $15 per barrel, cash capital expenditure of $27-$29 billion in 2026 and $28-$32 billion a year from 2027 to 2030, and approximately $145 billion of cumulative surplus cash flow through 2030 at $65 Brent. — 2026-2030 plan · publ. 9 December 2025 · source ↗
  7. Third-party estimateIt is still a narrow moat, because a cost advantage in a commodity is a relative position that competitors are actively working to erode, and because the barrel is sold at a price set by a cartel with three million barrels a day of spare capacity.
    The Middle East Insider, 'OPEC+ spare capacity April 2026' — Saudi Arabia's roughly 3.0 million barrels a day of spare capacity, the largest single-country buffer in the world, within total OPEC+ spare capacity above 5 million barrels a day, the highest reading since 2009. — April 2026 · publ. April 2026 · source ↗
  8. ReportedNon-US at 17.7 per cent against US at 4.3 per cent is a thirteen-point spread inside one company, one segment and one commodity.
    Exxon Mobil Corporation Form 10-K for FY2025, Business Profile (Financial) — earnings after income taxes, average capital employed, return on average capital employed and cash capital expenditures for each segment and geography, and the corporate total. — FY2025 · publ. February 2026 · source ↗
Sources
Generated September 23, 2026