⚠ The Contract Is Written by One GovernmentModerate threat

ExxonMobil (XOM) — threat to the moat

Twenty years of production rights, granted by a government whose budget now depends on them, in territory a neighbour claims.

Everything good about Guyana rests on a petroleum agreement, and a petroleum agreement is a contract with a sovereign. The Petroleum Activities Act 2023 authorises the government to license and enter agreements for exploration, development, production and storage, and provides for production periods of twenty years for an oil field with a renewal of up to ten1. That is generous by the standards of the industry, which is precisely the thing that invites revision.

What the Guyana position actually rests onProduction period, oil field20 years, renewable for up to 10Production period, gas field30 years, renewable for up to 10ExxonMobil interest45%, and operatorInstalled capacity todayabove 900,000 barrels a dayNon-US Upstream return, 202517.7% on $91,792m of capitalAll of it granted by one government, under the Petroleum Activities Act 2023.
A twenty-year contract on a floating asset that cannot be moved, in a country a neighbour has a claim against.

ExxonMobil's own risk factors set out the mechanism without naming the country: increases or changes in taxes, duties or government royalty rates, including retroactive claims, punitive taxes, windfall profit taxes, or price controls2. The company also warns about jurisdictions that lack well-developed legal systems or stable political frameworks, where the remedy is international arbitration whose adequacy still depends on local enforcement3.

The specific pressure in Guyana is arithmetic. A country of under a million people is receiving revenue from a block with installed capacity above 900,000 barrels a day and a path to roughly 1.3 million4. Every year the asset gets larger relative to the state, the original terms look more generous in retrospect, and the domestic argument for renegotiation gets louder. This is not a Guyanese peculiarity; it is what happened in Venezuela, in Kazakhstan and in the North Sea, and ExxonMobil has been on the wrong end of it before.

There is a second exposure that no contract covers. Venezuela claims the Essequibo region adjacent to the block, and the dispute is before the International Court of Justice. A deepwater vessel cannot be moved and cannot be defended.

What would falsify the Guyana case is not a dry well. It is a change in fiscal terms — a new royalty, a windfall levy, a renegotiated profit-oil split — applied to production that is already flowing and cannot be relocated. The number to watch is the non-US Upstream return on capital employed, 17.7 per cent in 20255. Guyana is most of what holds that figure up, and a fiscal change would show there first and nowhere else.

References
  1. ReportedThe Petroleum Activities Act 2023 authorises the government to license and enter agreements for exploration, development, production and storage, and provides for production periods of twenty years for an oil field with a renewal of up to ten.
    Exxon Mobil Corporation Form 10-K for FY2025, Items 1 and 2 — Business and Properties: oil and gas production and reserves tables, wells drilling, the review of principal ongoing activities by region (United States, Canada/Other Americas incl. Guyana and Brazil, Europe, Africa, Asia, Australia/Oceania), lease and production-sharing terms including the Guyana Petroleum Activities Act 2023, employees, and the list of lower-emission and new business opportunities. — FY2025 · publ. February 2026 · source ↗
  2. ReportedExxonMobil's own risk factors set out the mechanism without naming the country: increases or changes in taxes, duties or government royalty rates, including retroactive claims, punitive taxes, windfall profit taxes, or price controls.
    Exxon Mobil Corporation Form 10-K for FY2025, Item 1A Risk Factors — supply and demand, economic conditions, other demand- and supply-related factors, other market factors, government and political factors, access limitations, lack of legal certainty, regulatory and litigation risks, and the climate change and energy transition discussion. — FY2025 · publ. February 2026 · source ↗
  3. ReportedThe company also warns about jurisdictions that lack well-developed legal systems or stable political frameworks, where the remedy is international arbitration whose adequacy still depends on local enforcement.
    Exxon Mobil Corporation Form 10-K for FY2025, Item 1A Risk Factors — supply and demand, economic conditions, other demand- and supply-related factors, other market factors, government and political factors, access limitations, lack of legal certainty, regulatory and litigation risks, and the climate change and energy transition discussion. — FY2025 · publ. February 2026 · source ↗
  4. ReportedA country of under a million people is receiving revenue from a block with installed capacity above 900,000 barrels a day and a path to roughly 1.3 million.
    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 ↗
  5. ReportedThe number to watch is the non-US Upstream return on capital employed, 17.7 per cent in 2025.
    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