Marathon Petroleum Corp. (MPC) shares jumped over 4% in premarket trading Tuesday after the refining giant posted fourth-quarter results that weren't just good—they were spectacular. This is what happens when your core business margins surge 44% year-over-year.

The company brought in revenue of $33.42 billion, essentially flat compared to $33.47 billion in the same period last year, but handily beat the analyst estimate of $31.98 billion. The real story, though, wasn't the top line—it was profitability.

Adjusted earnings per share rocketed to $4.07 from a measly 77 cents a year ago, blowing past the $2.90 analyst consensus. Net income attributable to Marathon came in at $1.54 billion, or $5.12 per share, compared with just $371 million, or $1.15 per share, in last year's fourth quarter. Adjusted EBITDA hit $3.49 billion, up from $2.12 billion in the prior year.

Marathon also flexed its capital return muscles, buying back approximately $1.3 billion worth of shares during the quarter. The company still has $4.4 billion available under existing repurchase authorizations, so there's plenty of runway left. As of December 31, 2025, Marathon reported $3.7 billion in cash and cash equivalents, including $2.1 billion at MPLX LP (MPLX).

The Refining Story: Margins Are Back

Here's where things get interesting. In the Refining & Marketing segment, crude capacity utilization reached 95%, with throughput volumes hitting roughly 3.0 million barrels per day. The segment generated adjusted EBITDA of $2.0 billion, a massive jump from just $559 million in the fourth quarter of 2024.

The key metric everyone watches—refining margin per barrel—came in at $18.65, up from $12.93 a year ago. That 44% jump reflects the industry's recovery from the multi-year lows hit in 2024 after the Russia-Ukraine war supply shock finally started to ease. When your margins nearly double in volatile commodity markets, you're going to have a good quarter.

Of course, costs matter too. Refining operating costs ticked up to $5.70 per barrel from $5.26 in the year-ago quarter. The segment also absorbed $410 million in planned turnaround costs during Q4 2025, compared to $281 million in Q4 2024. But when your margins are expanding this fast, higher costs are just a footnote.

Other Segments: Mixed Results

The Midstream segment reported adjusted EBITDA of $1.7 billion, flat year over year. Higher rates, throughputs, and contributions from recent acquisitions were offset by increased operating expenses and the divestiture of non-core gathering and processing assets. Not exciting, but steady cash flow in midstream infrastructure is never a bad thing.

Renewable Diesel operations posted adjusted EBITDA of just $7 million in the fourth quarter of 2025, down from $28 million in the prior-year period. Utilization rates improved to 94%, which is solid, but a softer margin environment continues to pressure this business. It's a reminder that not every energy transition bet pays off immediately.

What Management Is Saying

President and CEO Maryann Mannen highlighted the company's strategic capital deployment: "The deployment of MPC capital enhances our competitiveness in each of the regions where we operate. In Midstream, MPLX is investing to execute its natural gas and NGL growth strategies. Growing MPLX distributions differentiates MPC from peers and supports our commitment to industry-leading capital return."

Shareholder Returns

On January 31, the board declared a quarterly dividend of $1.00 per share, payable on March 10, 2026, to shareholders of record as of February 18, 2026. Combined with the aggressive buyback program, Marathon is clearly committed to returning cash to shareholders.

Looking Ahead

For the first quarter of 2026, Marathon expects total refinery throughput of 2.74 million barrels per day, including 2.54 million barrels of crude oil and 200,000 barrels of other charge and blendstocks.

Projected refining operating costs are $5.85 per barrel, with planned turnaround costs of $465 million, distribution costs of $1.625 billion, and depreciation and amortization of $385 million. For the full fiscal year 2026, the company projects capital spending of $1.5 billion, with Refining and Marketing accounting for $1.41 billion of that total.

MPC Price Action: Marathon Petroleum shares were up 4.00% at $183.99 during premarket trading on Tuesday.