Oil company profits: drivers, cash flow and capex

Treating a rise in oil company profits as an automatic increase in drilling budgets skips two decisions: how much profit became cash, and where management chose to invest it. Oil company profits depend on realized selling prices, volumes, product mix and costs across different businesses. Capital spending then depends on cash resources, existing commitments and project economics, rather than on a fixed share of that profit.

Use the method below to separate upstream and downstream earnings, reconcile the cash available, and find actual spending and future plans in annual filings. The markets research guide provides the wider sector framework.

What drives oil company profits at each stage?

Start with the business that earned the money. A producer sells oil and gas; a refinery buys feedstock and sells a basket of products. Even inside one group, those activities respond differently to the same commodity-price move.

The following matrix is an analytical reading framework, based on the business descriptions and earnings discussion in the 2025 ExxonMobil 10-K and 2025 Petrobras 20-F. It is not a claim that every company reports these stages separately.

This table tells you what to look for; it cannot quantify a company’s sensitivity. Read its explanation of price, volume, margin, cost and one-time effects before attributing a change to oil prices alone.

Why can upstream and downstream move in different directions?

A higher realized crude price can benefit a producer, all else equal, while raising a refinery’s feedstock bill. Refining performance depends on what the resulting products sell for, the yield mix and operating expenses. Integration therefore does not guarantee that the divisions offset one another in a particular period.

EIA defines a crack spread as a price difference between petroleum products and crude oil. It also explains product seasonality and regional differences. Its refining methodology, section 4.1.1, uses a gasoline-and-diesel price basket less crude acquisition cost. That construction is a market indicator: it does not deduct every refinery expense, financing charge or tax, or reproduce a specific plant’s product slate.

Do not apply a benchmark crack spread to all barrels and call the result net income. Likewise, do not assume a chemicals division earns the fuel margin. Use the issuer’s own segment discussion and accounting perimeter.

How do profits become cash available for capex?

Profit does not automatically become a capital spending budget. Begin with the cash-flow statement, then read the investment and financing disclosures alongside it.

ExxonMobil’s 2025 10-K, Liquidity and Capital Resources, discusses the bridge from income to operating cash flow, including noncash depreciation and depletion, working-capital movements and differences between equity-company earnings and dividends received. These explain why reported profit and cash generated in the same year can differ.

Use this sequence when building a research note:

1. Label the starting profit. Record whether it is consolidated income, income attributable to shareholders, segment earnings or an adjusted measure. Keep any reconciliation.
2. Read operating cash flow. Identify noncash adjustments, receivables, inventories, payables and other disclosed cash-conversion effects. Follow the issuer’s statement presentation for taxes and interest.
3. Extract the investment measure. Distinguish additions to property, plant and equipment from acquisitions, investment advances, divestment receipts and company-defined capex.
4. Read the financing and liquidity choices. Dividends, buybacks, borrowing, debt repayment and opening cash affect the resources alongside internally generated cash.
5. Check committed and proposed projects separately. The timing of a multiyear build can differ from the year when its profits were earned.

Do not subtract depreciation a second time from operating cash flow if it has already been added back in the statement. Do not use net investing cash flow as a shortcut for gross capital spending: asset-sale receipts and other investment transactions can change the net figure.

The capital spending research guide explains the broader investment framework. Here, the useful output is a reconciled cash note with the issuer’s definitions attached, rather than a presumed “percentage of profits reinvested.”

Where do you find ExxonMobil capex and segment earnings?

For a reproducible starting point, open the 2025 Form 10-K PDF. Use the printed page labels below, which differ from the PDF viewer’s page count.

The Cash Capex definition combines PP&E additions, additional investments and advances, and other investing activities including collection of advances, with a reduction for inflows from noncontrolling interests for major projects. It is explicitly a non-GAAP measure. Copying only PP&E additions would therefore answer a different question.

Note 3 also describes resource allocation through annual planning and capital allocation using project economics and longer-term strategic objectives. That is the disclosed decision process to examine when asking why a profitable division did, or did not, receive a larger investment budget.

Segment results include internal transfers on the stated basis. Reconcile to the consolidated group rather than adding internal sales to external revenue.

Where do you find Petrobras capex and its business plan?

Use two document types: the 2025 Annual Report and Form 20-F for historical disclosures and the official strategy page for the linked 2026–2030 Business Plan presentation. Keep the report year, plan window and access date on the same research sheet.

The glossary’s CAPEX definition includes PP&E and intangible investment, equity-interest acquisitions and other specified items, including some expenses and credit purchases. Do not treat that definition as identical to ExxonMobil’s Cash Capex or to a cash-flow-statement line merely because each is called capital spending.

The 20-F distinguishes projects under implementation from those under evaluation. Within implementation, its base and target classifications carry different budget and financing conditions; the base category can include projects not yet sanctioned. A project in a plan is not proof of a payment, final sanction or completed capacity.

Petrobras’s state control is relevant to the governance questions a researcher asks, but it does not supply an explanation for any particular expenditure by itself. Read the report’s controlling-shareholder risk discussion, project governance and financing conditions, then compare plan updates with actual disbursements. Do not infer a fixed government-directed share of profits.

Can maintenance and growth capex be separated?

Only to the extent that disclosures support the distinction. A replacement pump, a reliability project and a new production system serve different purposes, but a project can combine asset renewal, environmental requirements and extra capacity.

For upstream assets, new development may partly replace the natural decline of existing fields. ExxonMobil discusses that decline and the continuing need to develop resources in its liquidity section. Spending on a new asset therefore does not, on its own, prove growth in group output.

As an analytical practice, classify disclosed project purposes as sustaining existing operations, adding capacity or changing product mix, or mixed / not separately disclosed. Preserve the company’s terminology beside your classification. If no credible split is reported, leave the amounts blank and state “not separately disclosed”; do not estimate maintenance capex by simply equating it with depreciation.

A source log you can reuse

Before comparing two companies, fill one row for each measure. This worksheet is a research aid, not a reported dataset.

A useful final note answers three separate questions: what changed earnings, what changed cash, and what changed the investment portfolio? If those answers rely on different measures or periods, explain the difference before drawing a conclusion.

Method and limits

This is an educational synthesis of issuer filings and EIA methodology opened on October 16, 2026. Filing examples refer to fiscal 2025; the Petrobras business-plan window is 2026–2030. They demonstrate where and how to read disclosures, without presenting a current profit league table, investment recommendation or oil-price forecast.

The stage matrix and extraction checklist are editorial analysis. The generic industrial scenes do not identify the assets of either issuer or document a particular investment. Company definitions, reporting structures and plans can change; reopen the relevant filing and plan before using this method for a later period. The source list below records the documents used and their locations.