Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionJustInvest LLC
Latest Disclosed Ownership69,235 shares
Latest Disclosed Value $ 16,905,802
JustInvest LLC reports 0.63% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 14, 2026 - JustInvest LLC filed a 13F-HR form disclosing ownership of 69,235 shares of Marathon Petroleum Corporation (MX:MPC) valued at $16,905,802 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 69,676 shares of Marathon Petroleum Corporation. This represents a change in shares of -0.63% 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)
2026-05-14 2026-03-31 13F MARATHON PETE COM 56585A102 69,235 -441 -0.63 16,906 49.19 0.1659
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 69,676 723 1.05 11,331 -14.77 0.1105
2025-10-31 2025-09-30 13F MARATHON PETE COM 56585A102 68,953 3,281 5.00 13,295 21.83 0.1362
2025-07-25 2025-06-30 13F MARATHON PETE COM 56585A102 65,672 14,972 29.53 10,913 47.75 0.1232
2025-05-14 2025-03-31 13F MARATHON PETE COM 56585A102 50,700 1,137 2.29 7,386 6.83 0.1089
2025-02-10 2024-12-31 13F MARATHON PETE COM 56585A102 49,563 -1,003 -1.98 6,914 -16.06 0.1044
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 50,566 4,186 9.03 8,238 5.16 0.1327
2024-08-12 2024-06-30 13F MARATHON PETE COM 56585A102 46,380 4,424 10.54 7,834 -7.35 0.1491
2024-05-09 2024-03-31 13F MARATHON PETE COM 56585A102 41,956 1,985 4.97 8,454 42.56 0.1814
2024-02-08 2023-12-31 13F MARATHON PETE COM 56585A102 39,971 353 0.89 5,930 -1.08 0.1539
2023-11-08 2023-09-30 13F MARATHON PETE COM 56585A102 39,618 2,096 5.59 5,996 37.03 0.1792
2023-07-28 2023-06-30 13F MARATHON PETE COM 56585A102 37,522 -13,410 -26.33 4,375 -36.29 0.1340
2023-05-10 2023-03-31 13F MARATHON PETE COM 56585A102 50,932 19,328 61.16 6,867 86.70 0.2385
2023-02-10 2022-12-31 13F MARATHON PETE COM 56585A102 31,604 -6,146 -16.28 3,678 -1.92 0.1518
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 37,750 9,072 31.63 3,750 59.03 0.1696
2022-08-12 2022-06-30 13F/A-1 MARATHON PETE COM 56585A102 28,678 7,706 36.74 2,358 31.51 0.1092
2022-08-09 2022-06-30 13F MARATHON PETE COM 56585A102 28,678 7,706 2,358 0.1092
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 20,972 8,479 67.87 1,793 124.41 0.0868
2022-02-23 2021-12-31 13F MARATHON PETE COM 56585A102 12,493 2,624 26.59 799 30.98 0.0471
2021-11-09 2021-09-30 13F MARATHON PETE COM 56585A102 9,869 245 2.55 610 4.99 0.0548
2021-08-11 2021-06-30 13F/A-1 MARATHON PETE COM 56585A102 9,624 -2,611 -21.34 581 -11.16 0.0608
2021-07-21 2021-06-30 13F MARATHON PETE COM 56585A102 12,235 0 654 0.0995
2021-04-28 2021-03-31 13F MARATHON PETE COM 56585A102 12,235 4,229 52.82 654 97.58 0.0990
2021-01-20 2020-12-31 13F/A-1 MARATHON PETE COM 56585A102 8,006 -218 -2.65 331 37.34 0.0720
2020-10-26 2020-09-30 13F MARATHON PETE COM 56585A102 8,224 466 6.01 241 -16.90 0.0676
2020-07-27 2020-06-30 13F MARATHON PETE COM 56585A102 7,758 7,758 290 0.1315
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.