Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionNational Pension Service
Latest Disclosed Ownership922,880 shares
Latest Disclosed Value $ 225,348,838
National Pension Service reports 4.23% increase in ownership of MPC / Marathon Petroleum Corporation

On May 12, 2026 - National Pension Service filed a 13F-HR form disclosing ownership of 922,880 shares of Marathon Petroleum Corporation (MX:MPC) valued at $225,348,838 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 885,426 shares of Marathon Petroleum Corporation. This represents a change in shares of 4.23% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-12 2026-03-31 13F MARATHON PETE COM 56585A102 922,880 37,454 4.23 225,349 56.50 0.1711
2026-02-10 2025-12-31 13F MARATHON PETE MARATHON PETE CORP 56585A102 885,426 36,158 4.26 143,997 -12.03 0.1066
2025-11-04 2025-09-30 13F MARATHON PETE COM 56585A102 849,268 14,308 1.71 163,688 18.02 0.1271
2025-08-08 2025-06-30 13F MARATHON PETE COM 56585A102 834,960 30,675 3.81 138,695 18.36 0.1197
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 804,285 1,522 0.19 117,176 4.64 0.1126
2025-02-05 2024-12-31 13F MARATHON PETE COM 56585A102 802,763 -174,487 -17.85 111,985 -29.66 0.1060
2024-10-30 2024-09-30 13F MARATHONPETECORP COM 56585A102 977,250 29,008 3.06 159,204 -3.22 0.1535
2024-08-13 2024-06-30 13F MARATHON PETE COM 56585A102 948,242 -22,717 -2.34 164,501 -15.92 0.1890
2024-05-14 2024-03-31 13F MARATHON PETE COM 56585A102 970,959 1,839 0.19 195,648 36.08 0.2348
2024-02-07 2023-12-31 13F MARATHON PETE COM 56585A102 969,120 26,941 2.86 143,779 1.05 0.2002
2023-11-15 2023-09-30 13F MARATHON PETE COM 56585A102 942,179 -8,561 -0.90 142,288 28.64 0.2277
2023-08-16 2023-06-30 13F MARATHON PETE COM 56585A102 950,740 120,990 14.58 110,609 -0.47 0.1784
2023-05-12 2023-03-31 13F MARATHON PETE COM 56585A102 829,750 26,658 3.32 111,137 18.90 0.2024
2023-02-24 2022-12-31 13F/A-1 MARATHON PETE COM 56585A102 803,092 -49,703 -5.83 93,472 11.05 0.1839
2023-02-21 2022-12-31 13F MARATHON PETE COM 56585A102 803,092 -49,703 93 0.1839
2023-02-24 2022-09-30 13F/A-1 MARATHON PETE COM 56585A102 852,795 -48,063 -5.34 84,171 13.65 0.1756
2022-11-18 2022-09-30 13F MARATHON PETE COM 56585A102 852,795 -48,063 84,171 0.1756
2022-08-17 2022-06-30 13F MARATHON PETE COM 56585A102 900,858 59,049 7.01 74,060 2.90 0.1527
2022-05-13 2022-03-31 13F MARATHON PETE COM 56585A102 841,809 -102,494 -10.85 71,975 19.11 0.1314
2022-02-15 2021-12-31 13F MARATHON PETE COM 56585A102 944,303 -32,385 -3.32 60,426 0.09 0.1054
2021-11-18 2021-09-30 13F MARATHON PETE COM 56585A102 976,688 29,781 3.15 60,369 5.52 0.1150
2021-08-17 2021-06-30 13F MARATHON PETE COM 56585A102 946,907 6,887 0.73 57,212 13.78 0.1087
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 940,020 -27,253 -2.82 50,282 25.69 0.1052
2021-02-19 2020-12-31 13F MARATHON PETE COM 56585A102 967,273 -2,947 -0.30 40,006 37.68 0.0912
2020-11-13 2020-09-30 13F MARATHON PETE COM 56585A102 970,220 0 0.00 29,058 -19.88 0.0763
2020-08-11 2020-06-30 13F MARATHON PETE COM 56585A102 970,220 47,945 5.20 36,267 66.48 0.1036
2020-05-27 2020-03-31 13F MARATHON PETE COM 56585A102 922,275 11,083 1.22 21,784 -60.32 0.0737
2020-02-21 2019-12-31 13F MARATHON PETE COM 56585A102 911,192 -16,616 -1.79 54,899 -2.60 0.1506
2019-11-15 2019-09-30 13F MARATHON PETE COM 56585A102 927,808 43,741 4.95 56,364 14.09 0.1784
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 884,067 61,667 7.50 49,402 0.37 0.1651
2019-05-15 2019-03-31 13F MARATHON PETE COM 56585A102 822,400 30,764 3.89 49,221 -2.91 0.1893
2019-02-15 2018-12-31 13F MARATHON PETE COM 56585A102 791,636 301,752 61.60 50,696 29.41 0.2091
2018-11-15 2018-09-30 13F MARATHON PETE COM 56585A102 489,884 -2,293 -0.47 39,176 14.55 0.1595
2018-08-14 2018-06-30 13F MARATHON PETE COM 56585A102 492,177 16,968 3.57 34,201 -1.56 0.1548
2018-04-13 2018-03-31 13F MARATHON PETE COM 56585A102 475,209 -43,708 -8.42 34,743 1.47 0.1722
2018-01-17 2017-12-31 13F MARATHON PETE COM 56585A102 518,917 -290 -0.06 34,238 18.88 0.1709
2017-10-16 2017-09-30 13F MARATHON PETROLEUM COM 56585A102 519,207 21,218 4.26 28,800 11.62 0.1585
2017-07-13 2017-06-30 13F MARATHON PETE COM 56585A102 497,989 47,885 10.64 25,801 14.33 0.1537
2017-04-11 2017-03-31 13F MARATHON PETE COM 56585A102 450,104 -665 -0.15 22,568 -0.56 0.1511
2017-01-18 2016-12-31 13F MARATHON PETE COM 56585A102 450,769 21,469 5.00 22,696 30.25 0.1553
2016-10-14 2016-09-30 13F MARATHON PETE COM 56585A102 429,300 32,501 8.19 17,425 15.69 0.1397
2016-08-11 2016-06-30 13F MARATHON PETE COM 56585A102 396,799 65,222 19.67 15,062 22.18 0.1337
2016-05-16 2016-03-31 13F MARATHON PETE COM 56585A102 331,577 14,237 4.49 12,328 -25.06 0.1235
2016-02-12 2015-12-31 13F MARATHON PETE COM 56585A102 317,340 19,289 6.47 16,451 19.13 0.1728
2015-10-15 2015-09-30 13F MARATHON PETE COM 56585A102 298,051 38,695 14.92 13,809 1.79 0.1746
2015-07-15 2015-06-30 13F MARATHON PETE COM 56585A102 259,356 147,872 132.64 13,566 18.84 0.1760
2015-04-15 2015-03-31 13F MARATHON PETE COM 56585A102 111,484 11,420 11.41 11,415 26.38 0.1649
2015-01-13 2014-12-31 13F MARATHON PETE COM 56585A102 100,064 -19,835 -16.54 9,032 -11.03 0.1524
2014-11-07 2014-09-30 13F MARATHON PETE COM 56585A102 119,899 119,899 10,152 0.1612
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.