Marathon Petroleum (MPC) Q3 2026: Record Cracks, Capture Falls to 93%

Marathon Petroleum (MPC) reported record third-quarter 2026 refining profit on November 3, 2026, but its refining margin capture fell to 93% and its margin per barrel slipped below the market crack spread for the first time this year. The results cover the quarter ended September 30, 2026. Refining & Marketing segment adjusted EBITDA reached $9.895 billion [1], driven mainly by a blended 3-2-1 crack spread that rose to $48.67 per barrel [2].

Going into the quarter, four questions mattered. Capture fell from 112% in the second quarter to 93% [3][4]. Crude throughput beat guidance by about 5% [5][6]. Buybacks rose to $3.005 billion, yet cash kept building [7][8]. Midstream EBITDA grew about 10% year over year [9]. The company also announced the sale of two northern refineries [10]. Overall, the quarter confirmed operating execution and midstream growth, while profit leverage came mainly from the market and cash deployment lagged cash generation.

Marathon Petroleum is one of the largest US refiners. It runs refineries in three regions and sells refined products to wholesale customers, branded distributors and export markets [11]. Its profit depends mainly on the spread between refined products and crude oil, minus operating and distribution costs. The company also owns about 64% of the common units of MPLX, which earns fees from pipelines and natural gas processing [12].

Refining margin capture fell below 100%

Capture is the ratio of Marathon's realized refining margin to its own market indicator, and it fell to 93% in the third quarter [3]. The Refining & Marketing margin was $45.70 per barrel [13], $2.97 below the $48.67 blended crack spread [2]; in the second quarter the margin had been $2.79 above the crack. The gap between segment EBITDA per barrel and the crack widened from $8.70 to $14.52. The company estimates that non-market factors such as crude mix, RINs and yields had a net negative effect of about $700 million year over year [14].

Management attributed the decline to secondary products, weaker jet fuel margins and seasonal inventory costs, and called secondary products the largest absolute headwind to capture it has seen [15]. Secondary products such as asphalt sell below the price of crude, so higher gasoline and diesel cracks widen the drag. Purchased RIN expense was $654 million, lower than in the second quarter [16]. The company noted that its capture measure excludes certain crude differential benefits, and it anticipates continued secondary product headwinds in the fourth quarter [17].

This result revises the second-quarter picture. Second-quarter capture included one-time items, and the excess profit seen at high cracks cannot yet be treated as normal. If the margin had matched the crack, segment EBITDA would have been roughly $860 million higher this quarter; that figure is an order-of-magnitude reference only.

Full utilization and faster midstream growth

Refinery operations beat company guidance. Crude throughput was 2,973 thousand barrels per day at 100% utilization [5], and refining operating costs were $5.60 per barrel, in line with guidance [1]. Management credited reliability investments [18]. At $34.15 of EBITDA per barrel, the throughput above guidance added roughly $460 million of EBITDA. The company projects fourth-quarter crude throughput of about 2.8 million barrels per day [19].

Midstream growth began to show up in results. Midstream EBITDA was about $1.9 billion, up about 10% year over year, driven by higher rates and throughputs, equity affiliate income and acquisitions [9]. Harmon Creek III entered service in August, while the Bay Runner pipeline moved to the fourth quarter [20]. MPLX raised its quarterly distribution by 12.5% [21].

Buybacks rose, but cash kept building

Buybacks increased, but cash accumulated faster. Marathon repurchased $3.005 billion of stock in the third quarter, up from $2.5 billion in the second quarter [7], and the board approved an incremental $5 billion authorization [22]. Consolidated cash was $12.81 billion at quarter end, or about $11.5 billion excluding MPLX [8], up from about $6.8 billion at the end of the second quarter. The liability for returning Strategic Petroleum Reserve crude rose to $1.9 billion, and the company must return about 26 million barrels starting in April 2027 [23], so not all of that cash is free to distribute.

New issue: the sale of two northern refineries

The refinery sale is a new issue this quarter. On November 2, the company agreed to sell the St. Paul Park and Mandan refineries and related midstream assets for $4.2 billion; MPC will receive $3.45 billion, with closing expected at the end of 2026 [10]. The carrying value of the related net assets was $1.8 billion [24]. Management said the proceeds will go mainly to the Gulf Coast, including a Galveston Bay hydrotreater due in service by late 2027 [25], that 2027 capital plans may rise [26], and that it expects record heavy Canadian crude processing in the fourth quarter [27]. The two refineries' capacity and profit contribution were not disclosed, so the net effect of the sale cannot yet be judged.

Conclusion

The third-quarter report updates the view of Marathon Petroleum in three ways. On growth, full utilization and faster midstream growth met or beat guidance. On profit conversion, record profit came mainly from the crack spread, and secondary products absorbed part of the upside when cracks spiked. On cash, buyback capacity strengthened, but cash built up faster, and the sale proceeds will go first to Gulf Coast investment. The next quarter's key tests are whether capture returns to 100%, whether the sale closes on schedule, and whether buybacks stay at $3 billion or more.

Sources

[1] MPC 8-K filed 2026-11-03 · 3Q26 earnings release · R&M commentary [2] MPC 10-Q filed 2026-11-03 · 3Q26 · 3Q26 benchmark prices and crack spreads [3] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · segment performance [4] MPC Q2 2026 earnings call 2026-08-04 (Drillr summary) · segment performance and capture [5] MPC 8-K filed 2026-11-03 · 3Q26 earnings release · R&M supplemental operating data [6] MPC 8-K filed 2026-08-04 · third-quarter 2026 outlook [7] MPC 10-Q filed 2026-11-03 · 3Q26 · Note 9 share repurchases [8] MPC 10-Q filed 2026-11-03 · 3Q26 · cash flows and liquidity [9] MPC 8-K filed 2026-11-03 · 3Q26 earnings release · Midstream commentary [10] MPC 8-K filed 2026-11-03 · 3Q26 earnings release · strategic update [11] MPC 10-K filed 2026-02-26 · business overview [12] MPC 10-K filed 2026-02-26 · reportable segments and MPLX ownership [13] MPC 8-K filed 2026-11-03 · 3Q26 earnings release · R&M per-barrel statistics [14] MPC 10-Q filed 2026-11-03 · 3Q26 · 3Q26 vs 3Q25 R&M MD&A [15] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · risks and Q&A on capture [16] MPC 10-Q filed 2026-11-03 · 3Q26 · 3Q26 RIN expense [17] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · Q&A on Q4 capture visibility [18] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · Q&A on utilization [19] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · fourth-quarter guidance [20] MPC 8-K filed 2026-11-03 · 3Q26 earnings release · MPLX strategic update [21] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · capital allocation [22] MPC 8-K filed 2026-11-03 · 3Q26 earnings release · return of capital [23] MPC 10-Q filed 2026-11-03 · 3Q26 · Note on SPR exchange derivatives [24] MPC 10-Q filed 2026-11-03 · 3Q26 · announced divestiture [25] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · Gulf Coast investments [26] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · Q&A on asset-sale proceeds [27] MPC Q3 2026 earnings call 2026-11-03 (Drillr summary) · Q&A on WCS sourcing after sale