NEW YORK, July 18, 2026, 12:11 p.m. EDT – Marathon Petroleum NYSE:MPC gained an estimated $8.5 billion in market value after refining margins reached record highs.
- Shares of Marathon climbed 10.2% during the past week, ending Friday’s session at $312.60 after reaching a 52-week high.
- An early estimate places the increase in market value at approximately $8.5 billion, which is nearly the same as the $8.6 billion buyback authorization announced in May.
- U.S. markets remained closed on Saturday. The next key event is Wednesday’s petroleum report.
Marathon Petroleum Corporation NYSE:MPC gained about $8.5 billion in market capitalization last week, with its share price advancing 10.2% to $312.60 after hitting a 52-week high on Friday.
The initial estimate is based on Friday’s market value of about $92.2 billion, as well as the price movement from July 10 onwards. The assessment assumes the share count remains largely unchanged.
The increase is close to Marathon’s $8.6 billion buyback authorization announced May 5. That sum was pro forma as of March 31, not a current cash holding.
The scale is significant. The equity increased by almost the value of one authorization ahead of second-quarter earnings.
Record-breaking crack spreads spurred the action. The U.S. 3-2-1 benchmark settled at $69.66 per barrel on Thursday, reaching an all-time high for the third consecutive session. Diesel margins exceeded $91 per barrel.
Gasoline stocks declined to 210.5 million barrels, marking the lowest seasonal level since 2012. Diesel inventories climbed by 4.5 million barrels, but stayed under typical seasonal levels.
Independent oil analyst John Kemp said Thursday that “Encouraging refiners to revert to max-gasoline mode will require higher gasoline prices.” According to Kemp, current margin strength is primarily driven by diesel. Reuters
Valero Energy Corporation NYSE:VLO and Phillips 66 NYSE:PSX followed the rally, while the S&P 500 declined.
| Company or index | Friday close | Weekly change | Friday change |
|---|---|---|---|
| Marathon Petroleum NYSE:MPC | $312.60 | up 10.2% | rose 2.2% |
| Valero Energy NYSE:VLO | $309.65 | advanced 10.3% | gained 3.1% |
| Phillips 66 NYSE:PSX | $206.86 | added 9.8% | climbed 2.8% |
| S&P 500 | 7,457.69 | fell 1.6% | dropped 1.0% |
The weekly changes are based on closing prices from July 10 and July 17.
The gap increased on Friday. The S&P 500 dropped 1.0%, while U.S. crude surged 4.5% to $82.49. Energy was the sole U.S. sector to advance.
Marathon’s second-quarter outlook highlights the impact of operational issues. The company forecasts throughput at 2.99 million barrels per day. Turnaround costs are projected at $300 million, while operating costs are expected to be $5.65 per barrel.
A $1 per barrel movement in margin, held steady, can be significant. Over a 91-day period, it equates to roughly $272 million in additional refining margin. This initial calculation does not represent company guidance and does not factor in hedging, outages, operating expenses or taxes.
Benchmark cracks are not a direct dollar-for-dollar conversion. Marathon reported a refining and marketing margin of $17.74 per barrel for the first quarter. Capture is impacted by factors including product yields, crude mix and hedging.
Marathon CEO Maryann Mannen stated in May that the company remained “largely insulated from global crude supply disruptions.” She attributed this resilience to primarily sourcing from the United States and Canada. Reuters
U.S. stock markets resume trading Monday, July 20. The upcoming EIA petroleum report will be released Wednesday, July 22, following 10:30 a.m. EDT. Market participants are monitoring gasoline inventories, diesel supplies, and refinery activity.
Marathon will announce its second-quarter results on August 4 at 11 a.m. ET. The update will provide insight into realized margins, throughput, and the pace of buybacks.
Risks: Product cracks may decline rapidly if crude prices increase or fuel consumption drops. Cash conversion could be affected by outages, hedging losses, or extended maintenance.
The stock faces increased expectations. Upcoming inventory data on Wednesday will indicate if product shortages support the recent valuation boost.
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