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MPC +4.6%: an unusually large move for this stock. Marathon Petroleum Corp moved 1.8 points more than its sector, on 0.4× its usual volume.

2026-10-08 · MPC

MPC +4.6%: an unusually large move for this stock

Marathon Petroleum Corp moved 1.8 points more than its sector, on 0.4× its usual volume.

The story in plain words

Thursday, October 8, 2026. MPC +4.6%: an unusually large move for this stock. Marathon Petroleum Corp moved 1.8 points more than its sector, on 0.4× its usual volume.

What the data shows for Marathon Petroleum (MPC): MPC +4.6% today. Its sector fund (XLE) +2.8% today. S&P 500 (SPY) −0.2% today.

Worked out from that data: 1.8 points more than its sector. Volume 0.4× its 20-day average. Bigger than 92% of its daily moves over the past 250 trading days. After the 10 most similar MPC days since Oct 20, 2021, the stock was higher 5 days later 6 of 10 times (History, not a forecast).

Possible contributors. These line up in time with the move; they are not confirmed causes: News: “Delek's Full SRE Approval: Is RIN Relief Set to Improve Margins?” (Published around the move. Timing only, not a confirmed cause). News: “HP's Strong Q4 Outlook and FlexRobotics Drive Investor Focus” (Published around the move. Timing only, not a confirmed cause).

About the company: Marathon Petroleum trades as MPC and is part of the S&P 500, in the Energy sector (Oil & Gas Refining & Marketing), headquartered in Findlay, Ohio, founded in 2009.

This is one of CookieStocks’ daily stock stories about unusually large one-day price moves in S&P 500 stocks, measured against each stock’s own history, its sector and its usual volume. Stories are found automatically each trading day from market data and SEC filings, and every claim is labelled as observed, calculated or a possible contributor. Statistics only, not investment advice.

Prove it

Every claim on the graphic, labelled: observed (straight from the data), calculated (worked out from it), or possible contributor (lines up in time, not a confirmed cause).

  • OBSERVED
    MPC +4.6% todayOct 8, 2026, 12:35 PM ET
  • OBSERVED
    Its sector fund (XLE) +2.8% todayOct 8, 2026, 12:35 PM ET
  • CALCULATED
    1.8 points more than its sectorHow: stock return − sector fund return · Oct 8, 2026, 12:35 PM ET
  • OBSERVED
    S&P 500 (SPY) −0.2% todayOct 8, 2026, 12:35 PM ET
  • CALCULATED
    Volume 0.4× its 20-day averageHow: today’s volume ÷ average of the last 20 days · Oct 8, 2026, 12:35 PM ET
  • CALCULATED
    Bigger than 92% of its daily moves over the past 250 trading daysHow: share of past daily moves smaller in size · Oct 8, 2026, 12:35 PM ET
  • POSSIBLE CONTRIBUTOR
    News: “Delek's Full SRE Approval: Is RIN Relief Set to Improve Margins?”Published around the move. Timing only, not a confirmed cause. · Oct 8, 2026, 9:21 AM ET
  • POSSIBLE CONTRIBUTOR
    News: “HP's Strong Q4 Outlook and FlexRobotics Drive Investor Focus”Published around the move. Timing only, not a confirmed cause. · Oct 8, 2026, 9:14 AM ET
  • CALCULATED
    After the 10 most similar MPC days since Oct 20, 2021, the stock was higher 5 days later 6 of 10 timesHistory, not a forecast. · How: same-company days with a move of similar size and direction

Marathon Petroleum (MPC) financials and filings →

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Statistics only, not investment advice. Past moves don’t predict future ones. Data as of Oct 8, 2026, 12:35 PM ET.