Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionInvestors Research Corp
Latest Disclosed Ownership4,971 shares
Latest Disclosed Value $ 1,213,819
Investors Research Corp reports 8.72% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 3, 2026 - Investors Research Corp filed a 13F-HR form disclosing ownership of 4,971 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,213,819 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 6, 2026 disclosing 5,446 shares of Marathon Petroleum Corporation. This represents a change in shares of -8.72% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-03 2026-03-31 13F MARATHON PETE COM 56585A102 4,971 -475 -8.72 1,214 37.06 0.2239
2026-01-06 2025-12-31 13F MARATHON PETE COM 56585A102 5,446 0 0.00 886 -15.63 0.1622
2025-10-02 2025-09-30 13F MARATHON PETE COM 56585A102 5,446 0 0.00 1,050 16.04 0.1942
2025-07-07 2025-06-30 13F MARATHON PETE COM 56585A102 5,446 0 0.00 905 14.00 0.1774
2025-04-08 2025-03-31 13F MARATHON PETE COM 56585A102 5,446 0 0.00 793 4.48 0.1718
2025-02-07 2024-12-31 13F MARATHON PETE COM 56585A102 5,446 -75 -1.36 760 -15.57 0.1669
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 5,521 0 0.00 899 -6.06 0.1965
2024-07-31 2024-06-30 13F MARATHON PETE COM 56585A102 5,521 28 0.51 958 -13.47 0.2238
2024-05-06 2024-03-31 13F MARATHON PETE COM 56585A102 5,493 -7,639 -58.17 1,107 -43.22 0.2588
2024-01-30 2023-12-31 13F MARATHON PETE COM 56585A102 13,132 -225 -1.68 1,948 -3.61 0.4703
2023-11-01 2023-09-30 13F MARATHON PETE COM 56585A102 13,357 150 1.14 2,021 31.32 0.5279
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 13,207 -50 -0.38 1,540 -13.88 0.3887
2023-05-11 2023-03-31 13F MARATHON PETE COM 56585A102 13,257 -700 -5.02 1,787 10.04 0.4643
2023-02-06 2022-12-31 13F MARATHON PETE COM 56585A102 13,957 0 0.00 1,624 17.17 0.4395
2022-11-10 2022-09-30 13F MARATHON PETE COM 56585A102 13,957 -175 -1.24 1,386 19.28 0.4245
2022-07-21 2022-06-30 13F MARATHON PETE COM 56585A102 14,132 -6,050 -29.98 1,162 -32.68 0.3493
2022-04-13 2022-03-31 13F MARATHON PETE COM 56585A102 20,182 0 0.00 1,726 33.69 0.4875
2022-01-27 2021-12-31 13F MARATHON PETE COM 56585A102 20,182 0 0.00 1,291 3.53 0.3908
2021-10-27 2021-09-30 13F MARATHON PETE COM 56585A102 20,182 0 0.00 1,247 2.30 0.4209
2021-07-29 2021-06-30 13F MARATHON PETE COM 56585A102 20,182 0 0.00 1,219 12.87 0.4217
2021-04-28 2021-03-31 13F MARATHON PETE COM 56585A102 20,182 -375 -1.82 1,080 27.06 0.4068
2021-01-21 2020-12-31 13F MARATHON PETE COM 56585A102 20,557 -125 -0.60 850 40.03 0.3345
2020-10-20 2020-09-30 13F MARATHON PETE COM 56585A102 20,682 -394 -1.87 607 -22.97 0.2946
2020-07-21 2020-06-30 13F MARATHON PETE COM 56585A102 21,076 -100 -0.47 788 57.60 0.3954
2020-05-05 2020-03-31 13F MARATHON PETE COM 56585A102 21,176 975 4.83 500 -58.92 0.3120
2020-02-11 2019-12-31 13F MARATHON PETE COM 56585A102 20,201 -25 -0.12 1,217 -0.98 0.5613
2019-10-22 2019-09-30 13F MARATHON PETE COM 56585A102 20,226 -200 -0.98 1,229 7.71 0.6233
2019-07-08 2019-06-30 13F MARATHON PETE COM 56585A102 20,426 17,674 642.22 1,141 591.52 0.5958
2019-04-23 2019-03-31 13F MARATHON PETE COM 56585A102 2,752 2,752 165 0.0880
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.