Marathon Petroleum Q3 2026 Earnings: Refining Margins Lift Adjusted EBITDA to $11.7 Billion

Marathon Petroleum (NYSE: MPC) reported Q3 2026 sales and other operating revenue of $56.0 billion, up approximately 61% from $34.8 billion, while diluted EPS increased to $26.59 from $4.51. The central driver was a sharp expansion in refining margins, supported by stronger crack spreads across all regions and crude capacity utilization of 100%.

Core Financial Results

Profit grew considerably faster than revenue. Operating income rose to $10.5 billion, producing an operating margin of approximately 18.7%, compared with 7.8% a year earlier.

Adjusted results exclude items including tax and legal settlements in 2026 and a gain on asset sales in 2025. The decline in weighted-average diluted shares to 280 million from 304 million also amplified EPS growth relative to net income growth.

Business and Segment Performance

Refining & Marketing accounted for most of the increase in adjusted EBITDA. Midstream posted more moderate growth, while Renewable Diesel moved from a loss to positive adjusted EBITDA.

Midstream benefited from higher rates and throughput, increased equity-affiliate income, and acquisitions. Those contributions were partly offset by noncore asset divestitures and higher operating expenses, including incentive compensation.

Renewable Diesel’s improvement reflected a stronger margin environment, better regulatory credit values, and higher throughput. The segment’s margin rose to $304 million from $8 million, while adjusted EBITDA improved by $310 million.

Refining Margin Expansion Drove the Earnings Step-Up

Refining & Marketing margin increased to $45.70 per barrel from $17.60, while segment adjusted EBITDA per barrel rose to $34.15 from $6.37. Management attributed the change primarily to higher market crack spreads across all regions: Gulf Coast margin reached $43.46 per barrel, Mid-Continent reached $47.33, and West Coast reached $47.46.

Operational performance provided additional support. Crude capacity utilization increased to 100% from 95%, and net refinery throughput rose to 3.15 million barrels per day from 3.01 million. At the same time, refining operating costs were nearly unchanged at $5.60 per barrel versus $5.59, indicating that the profit increase came mainly from market margins and higher utilization rather than lower underlying operating costs.

Planned refining turnaround costs declined to $294 million from $400 million. This helped results, but the $106 million reduction was small relative to the more than $8 billion increase in segment adjusted EBITDA, reinforcing the importance of crack spreads and throughput to the quarter.

Liquidity, Debt, and Capital Returns

MPC ended September with $13.6 billion of cash, cash equivalents, and short-term investments, including $1.3 billion held by MPLX. The company had no borrowings outstanding under its $5 billion revolving credit facility.

Consolidated debt was $33.0 billion, compared with $32.8 billion at June 30. Within that total, MPC debt declined by $762 million to $6.4 billion, while MPLX debt increased by $968 million to $26.6 billion. MPC also redeemed $749 million of senior notes due in December 2026.

The company returned $3.3 billion to shareholders during the quarter and approved an additional $5 billion share repurchase authorization. Including the $3.1 billion previously available, repurchase capacity would have totaled $8.1 billion as of September 30. MPC also announced a 10% quarterly dividend increase, while MPLX raised its distribution by 12.5% for a third consecutive year; MPC expects $3.1 billion in annual distributions from MPLX.

Quarterly capital expenditures and investments totaled $1.44 billion, compared with $1.39 billion a year earlier. The company did not break out operating or free cash flow in the supplied quarterly data.

Portfolio Changes and Capital Investment

MPC agreed to divest the St. Paul Park and Mandan refineries and related midstream assets for $4.2 billion. MPC is set to receive $3.45 billion and plans to prioritize reinvestment in the Gulf Coast, while MPLX will receive $750 million for the associated logistics assets and intends to direct capital toward Permian and Marcellus growth. The transaction is expected to close at the end of 2026.

MPC’s 2026 capital spending outlook, excluding MPLX, remains $1.5 billion. Approximately 65% is allocated to value-enhancing investments and 35% to sustaining operations, including projects at the Galveston Bay, Robinson, El Paso, and Garyville refineries.

Separately, MPLX is investing $2.9 billion in organic growth projects, with more than 90% directed toward natural gas and natural gas liquids infrastructure. Several pipeline and processing projects are scheduled to enter service from late 2026 through 2030, creating execution and timing considerations alongside their expected growth contribution.

Q4 2026 Outlook

The fourth-quarter outlook calls for total refinery throughput of 3.08 million barrels per day, approximately 2% below the Q3 level. Planned turnaround costs are expected to decline to $230 million from $294 million, while refining operating costs per barrel are projected to remain unchanged.

The expected reduction in throughput may limit the volume benefit seen in Q3, although lower planned turnaround spending provides a partial offset. Actual profitability will still depend heavily on refining market conditions because MPC did not provide revenue or earnings guidance.

Recent Insider Transactions

The supplied insider dataset lists seven sales, two derivative-security conversions, and one stock award among the 10 most recent reported transactions. All were recorded as direct holdings; the entries provide transaction values rather than share quantities.

These transactions should be viewed objectively because the supplied records do not state the reasons for the sales, conversions, or award.

Risks Investors Should Watch

• Refining-margin sensitivity: The quarter’s earnings increase was dominated by higher crack spreads. A reversal in regional refining margins could have an outsized effect on adjusted EBITDA and net income.
• Lower fourth-quarter throughput: MPC expects total refinery throughput to decline from 3.15 million barrels per day in Q3 to 3.08 million in Q4, reducing the volume contribution if realized.
• Renewable-fuel economics: Renewable Diesel’s recovery depended partly on improved regulatory credit values. Changes in credit pricing or policy could affect segment margins.
• Cost pressure: Corporate expenses increased because of incentive compensation, while Midstream faced higher operating expenses. Continued increases could offset part of the benefit from volume and rate growth.
• Transaction and project execution: The planned refinery divestiture and the broad MPC and MPLX investment pipeline depend on timely closing, construction, regulatory approvals, and achievement of expected returns.

Summary

Marathon Petroleum’s Q3 2026 results were defined by a major increase in refining margins, full crude capacity utilization, and relatively stable per-barrel operating costs. Midstream provided steadier growth, while Renewable Diesel returned to positive adjusted EBITDA. The next points to monitor are whether refining conditions remain supportive, how the lower Q4 throughput outlook affects results, and whether MPC can complete its portfolio shift and reinvestment program on schedule.