ONEOK is a pipeline company. It moves natural gas, natural gas liquids (NGLs), refined products like gasoline, and crude oil through roughly 60,000 miles of pipelines across the United States. It does not drill for oil or gas. Instead, it charges fees to producers and refiners who need to move their energy products from where they are found to where they are used. Think of it like a toll road: the traffic pays the toll whether the price of oil is high or low. About 90% of earnings in 2025 came from these fee-based arrangements, which means results are more stable than for companies that bet directly on commodity prices. The diagram below traces where the money goes.

Five years of data tell a clear story about what has happened to this business. Revenue was $16.5 billion in 2021. It jumped to $22.4 billion in 2022, then fell back to $17.7 billion in 2023, before rising again to $21.7 billion in 2024 and then surging to $33.6 billion in 2025. That 2025 number is not organic growth alone. A series of large acquisitions drove most of it, especially the full-year contribution of EnLink, which ONEOK absorbed on January 31, 2025.

Gross margin tells a different and more revealing story. It sat at 25.9% in 2021, dropped to 20.0% in 2022 when commodity costs spiked, then climbed steadily to 32.5% in 2023 and 38.7% in 2024, before pulling back to 30.5% in 2025. The pullback in 2025 happened even as revenue hit a record high, partly because commodity sales volume through the newly acquired EnLink assets brought more low-margin trading revenue into the mix. The underlying fee-based earnings, however, continued to grow. Adjusted EBITDA (earnings before interest, taxes, depreciation and amortization, a standard measure of operating profit in this industry) rose from $5.2 billion in 2023 to $6.8 billion in 2024 and then to $8.0 billion in 2025.

Operating cash flow has also grown steadily, from $2.5 billion in 2021 to $5.6 billion in 2025. Free cash flow (what is left after capital spending) tells a more complicated story. It was $1.8 billion in 2021, dipped to $1.7 billion in 2022, recovered to $2.8 billion in 2023, held at $2.9 billion in 2024, and then fell to $2.4 billion in 2025 even though operating cash hit a new high. The reason: capital spending jumped to $3.2 billion in 2025, up from $2.0 billion in 2024, as ONEOK poured money into new pipelines, processing plants, and export terminals. The company is in a heavy-investment phase.

The cost of all this growth shows up on the balance sheet. Net debt was $14.4 billion in 2021. It barely moved in 2022, sitting at $14.3 billion. Then it stepped up sharply: $21.8 billion in 2023 after the Magellan acquisition, $31.3 billion in 2024 as ONEOK funded EnLink and Medallion deals, and $32.7 billion by the end of 2025. Interest expense followed the same path, rising from an unspecified base to $1.8 billion in 2025, up from $1.4 billion in 2024 and $866 million in 2023. A larger debt load means more of every dollar earned goes to lenders before it reaches shareholders.

The fee-based structure provides some insulation from price swings, but it does not eliminate all risk. The risk factors in ONEOK's own filings name five specific threats worth understanding. First, ONEOK does not control the wells that feed its pipes. If oil and gas producers drill less, there is less product to move, and revenue falls even if fee rates stay the same. Second, some earnings are still tied to commodity prices directly, through contracts where ONEOK buys and resells products. When prices drop, those margins compress. Third, federal regulators at FERC and various state agencies control how much ONEOK can charge on regulated pipelines. Regulators can force rate cuts or demand refunds, which directly reduces cash flow. Fourth, ONEOK depends on refineries, third-party gathering systems, and other infrastructure it does not own. If those facilities shut down because of severe weather or accidents, ONEOK cannot move product and loses revenue until service resumes. Fifth, and most immediate, the company carries $32.7 billion in net debt. If interest rates rise further or cash flows disappoint, funding operations and paying dividends becomes harder.

ONEOK is also spending heavily on projects not yet complete. A new 230-mile refined products pipeline to Denver International Airport is due in mid-2026. A rebuilt fractionator in Medford, Oklahoma, a new liquefied petroleum gas export terminal in Texas City, Texas, and a new pipeline to feed it are due in early 2028. A 300 MMcf per day natural gas processing plant called Bighorn in the Permian Basin is targeted for mid-2027. The Eiger Express Pipeline, a 450-mile gas line from the Permian Basin to Katy, Texas, is due in mid-2028. All of these projects will require capital before they generate revenue.

The dividend has grown every year in this period. ONEOK paid $4.12 per share in common dividends during 2025, up 4% from the $3.96 per share paid in 2024. In January 2026, the board raised the quarterly rate again, to $1.07 per share, putting the annualized rate at $4.28. The board has also authorized a $2.0 billion share repurchase program, of which $234 million had been used as of December 31, 2025. Both the dividend and the buyback program depend on continued strong cash generation from the expanded asset base.