Marathon Petroleum’s adjusted EBITDA jumps 3.7x as crack spreads widen (NYSE: MPC)

What happened

Marathon Petroleum Corporation (NYSE: MPC) reported third-quarter 2026 adjusted EBITDA of $11.7 billion, up from $3.2 billion a year earlier. OptimistFi calculates the gain at $8.5 billion, or 3.7 times the year-earlier quarter.

Net income attributable to MPC was $7.4 billion, or $26.59 per diluted share. A year earlier it was $1.4 billion, or $4.51 per share. Adjusted net income was $7.5 billion, or $26.93 per diluted share, against $915 million, or $3.01.

The earnings release also announced a higher dividend, a new buyback authorization and the sale of two refineries. Its adjusted income reconciliation lists one-time items. These include tax and legal settlements, a gain on sale of assets and a Small Refinery Exemption credit.

Key numbers

Metric	Latest	Change	Source
Adjusted EBITDA, Q3 2026	$11.7 billion	from $3.2 billion, +$8.5 billion	SEC 8-K (change calculated by OptimistFi)
Diluted EPS attributable to MPC	$26.59	from $4.51, +$22.08	SEC 8-K (change calculated by OptimistFi)
Adjusted diluted EPS	$26.93	from $3.01, +$23.92	SEC 8-K (change calculated by OptimistFi)
Refining & Marketing segment adjusted EBITDA per barrel	$34.15	from $6.37, +$27.78	SEC 8-K (change calculated by OptimistFi)
Capital returned to shareholders, Q3 2026	$3.3 billion		SEC 8-K
Cash, cash equivalents and short-term investments, Sept. 30, 2026	$13.6 billion		SEC 8-K

Read more: Marathon Petroleum (MPC) company research

Where the profit came from

Refining and marketing supplied almost all of the increase. Segment adjusted EBITDA there was $9.9 billion, versus $1.8 billion a year earlier. OptimistFi calculates that as nearly all of the total gain.

The filing says higher market crack spreads in all regions drove results. Refining and marketing margin was $45.70 per barrel, versus $17.60. Refining operating costs held at $5.60 per barrel, versus $5.59. So most of the wider margin reached segment profit, which was $34.15 per barrel against $6.37.

Operations ran harder too. Crude capacity utilization was 100%, versus 95%, on total throughput of 3.2 million barrels per day. Midstream segment adjusted EBITDA rose to $1.9 billion from $1.7 billion. The filing cites higher rates and throughputs, more income from equity affiliates and acquisitions. Renewable diesel earned $254 million, against a loss of $56 million.

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Cash returns and the Mid-Con sale

MPC returned $3.3 billion of capital to shareholders in the quarter. The Board also approved an incremental $5 billion repurchase authorization. With it, MPC would have had $8.1 billion available as of Sept. 30, against $3.1 billion under existing authorizations. The filing says repurchases may be suspended or stopped at any time.

Shares outstanding fell to 275 million on Sept. 30 from 283 million on June 30. MPC held $13.6 billion of cash, cash equivalents and short-term investments, including $1.3 billion at MPLX. It had no borrowings under its revolving credit facility. On Sept. 15 it redeemed all of its $749 million senior notes due December 2026.

The sale covers the St. Paul Park and Mandan refineries and related midstream assets for $4.2 billion. MPC will receive $3.45 billion and intends to reinvest it mainly in the Gulf Coast. MPLX will receive $750 million, a 9x multiple on forecast 2027 adjusted EBITDA of the associated logistics assets.

Why it matters

OptimistFi has argued that MPC creates value by turning refining and midstream assets into cash flow when crack spreads are wide. The quarter strengthens that view. The dividend increase and buyback authorization show that cash going to holders.

Midstream adds a steadier layer. MPLX raised its quarterly distribution by 12.5%, its third straight annual increase. The filing also gives an expected annual distribution figure to MPC.

The caveat is where the profit came from. The filing credits higher market crack spreads, and refining costs per barrel were flat. So the swing came mostly from margin. If margins fall back toward last year's levels, this quarter's run rate would not hold. The case depends on margins staying above breakeven, and one quarter does not test that.

What's next

The sale of St. Paul Park and Mandan is expected to close at the end of 2026. Closing on schedule would let MPC start putting the proceeds into Gulf Coast projects, as it intends. The filing lists regulatory approvals and closing conditions among the risks to planned deals.

Fourth-quarter 2026 results are the next test. MPC's outlook calls for total refinery throughput of 3.08 million barrels per day and planned turnaround costs of $230 million. If crack spreads stay wide, the fourth-quarter report would back the case. A sharp slide in refining margin would show how much of this quarter depended on them.

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