Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership3,087,982 shares
Latest Disclosed Value $ 754,105,389
Dimensional Fund Advisors Lp reports 7.77% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 3,087,982 shares of Marathon Petroleum Corporation (US:MPC) valued at $754,023,445 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 3,348,270 shares of Marathon Petroleum Corporation. This represents a change in shares of -7.77% during the quarter. The current value of the position is $825,139,670 USD.

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)
2026-05-07 2026-03-31 13F MARATHON PETE COM 56585A102 3,087,982 -260,288 -7.77 754,105 38.48 0.0338
2026-02-12 2025-12-31 13F MARATHON PETE COM 56585A102 3,348,270 -62,385 -1.83 544,574 -17.18 0.1142
2025-11-12 2025-09-30 13F MARATHON PETE COM 56585A102 3,410,655 -287,474 -7.77 657,542 7.02 0.1411
2025-08-12 2025-06-30 13F MARATHON PETE COM 56585A102 3,698,129 -486,901 -11.63 614,396 0.78 0.1422
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 4,185,030 -214,947 -4.89 609,613 -0.65 0.1515
2025-02-13 2024-12-31 13F MARATHON PETE COM 56585A102 4,399,977 452,043 11.45 613,624 -4.60 0.1474
2024-11-07 2024-09-30 13F MARATHON PETE COM 56585A102 3,947,934 -382,395 -8.83 643,192 -14.38 0.1560
2024-08-09 2024-06-30 13F MARATHON PETE COM 56585A102 4,330,329 -540,654 -11.10 751,210 -23.46 0.1962
2024-05-10 2024-03-31 13F MARATHON PETE COM 56585A102 4,870,983 -282,653 -5.48 981,503 28.38 0.2657
2024-02-07 2023-12-31 13F MARATHON PETE COM 56585A102 5,153,636 137,341 2.74 764,526 0.68 0.2232
2023-11-09 2023-09-30 13F MARATHON PETE COM 56585A102 5,016,295 -221,394 -4.23 759,350 24.34 0.2490
2023-08-09 2023-06-30 13F MARATHON PETE COM 56585A102 5,237,689 -286,581 -5.19 610,727 -18.00 0.1946
2023-05-12 2023-03-31 13F MARATHON PETE COM 56585A102 5,524,270 -70,247 -1.26 744,811 114,310.29 0.2509
2023-02-09 2022-12-31 13F MARATHON PETE COM 56585A102 5,594,517 123,745 2.26 651 -99.88 0.1924
2022-11-10 2022-09-30 13F MARATHON PETE COM 56585A102 5,470,772 163,151 3.07 543,405 24.53 0.2086
2022-08-12 2022-06-30 13F MARATHON PETE COM 56585A102 5,307,621 -23 -0.00 436,379 -3.84 0.1565
2022-05-13 2022-03-31 13F MARATHON PETE COM 56585A102 5,307,644 -32,397 -0.61 453,800 32.81 0.1398
2022-02-09 2021-12-31 13F MARATHON PETE COM 56585A102 5,340,041 -1,276,209 -19.29 341,681 -16.45 0.1033
2021-11-12 2021-09-30 13F MARATHON PETE COM 56585A102 6,616,250 -97,801 -1.46 408,968 0.82 0.1317
2021-08-12 2021-06-30 13F MARATHON PETE COM 56585A102 6,714,051 -4,043 -0.06 405,643 12.88 0.1284
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 6,718,094 -695,859 -9.39 359,359 17.19 0.1189
2021-03-08 2020-12-31 13F/A-2 MARATHON PETE COM 56585A102 7,413,953 -117,329 -1.56 306,658 38.79 0.1107
2021-02-11 2020-12-31 13F MARATHON PETE COM 56585A102 7,413,953 -117,329 306,658 110,748.5698
2020-11-12 2020-09-30 13F MARATHON PETE COM 56585A102 7,531,282 128,039 1.73 220,959 -20.12 0.0937
2020-08-13 2020-06-30 13F MARATHON PETE COM 56585A102 7,403,243 103,139 1.41 276,608 60.39 0.1216
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 7,300,104 -97,360 -1.32 172,464 -61.30 0.0898
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 7,397,464 7,211 0.10 445,662 -0.75 0.1624
2019-11-12 2019-09-30 13F MARATHON PETE COM 56585A102 7,390,253 -127,091 -1.69 449,046 6.92 0.1745
2019-08-13 2019-06-30 13F MARATHON PETE COM 56585A102 7,517,344 -1,027,077 -12.02 420,001 -17.88 0.1631
2019-08-12 2019-03-31 13F/A-2 MARATHON PETE COM 56585A102 8,544,421 -1,521,038 -15.11 511,449 -13.89 0.2037
2019-05-10 2019-03-31 13F MARATHON PETE COM 56585A102 8,544,421 -1,521,038 511,449
2019-02-26 2018-12-31 13F/A-1 MARATHON PETE COM 56585A102 10,065,459 4,153,879 70.27 593,940 25.59 0.2691
2019-02-13 2018-12-31 13F MARATHON PETE COM 56585A102 10,065,459 4,153,879 593,940
2018-11-13 2018-09-30 13F MARATHON PETE COM 56585A102 5,911,580 -49,461 -0.83 472,931 13.09 0.1800
2018-08-10 2018-06-30 13F MARATHON PETE COM 56585A102 5,961,041 -12,702 -0.21 418,195 -4.25 0.1667
2018-05-11 2018-03-31 13F MARATHON PETE COM 56585A102 5,973,743 -11,896 -0.20 436,740 10.58 0.1820
2018-02-12 2017-12-31 13F MARATHON PETE COM 56585A102 5,985,639 -117,395 -1.92 394,970 15.41 0.1637
2017-11-13 2017-09-30 13F MARATHON PETE COM 56585A102 6,103,034 35,033 0.58 342,221 7.78 0.1495
2017-08-11 2017-06-30 13F MARATHON PETE COM 56585A102 6,068,001 17,439 0.29 317,521 3.84 0.1466
2017-05-12 2017-03-31 13F MARATHON PETE COM 56585A102 6,050,562 40,392 0.67 305,767 1.04 0.1461
2017-02-09 2016-12-31 13F MARATHON PETE COM 56585A102 6,010,170 30,099 0.50 302,624 24.69 0.1512
2016-11-10 2016-09-30 13F MARATHON PETE COM 56585A102 5,980,071 189,921 3.28 242,696 10.43 0.1312
2016-08-09 2016-06-30 13F MARATHON PETE COM 56585A102 5,790,150 28,217 0.49 219,769 2.60 0.1265
2016-05-13 2016-03-31 13F MARATHON PETE COM 56585A102 5,761,933 103,198 1.82 214,203 -26.98 0.1282
2016-02-10 2015-12-31 13F MARATHON PETE COM 56585A102 5,658,735 -279,382 -4.70 293,365 6.64 0.1829
2015-11-13 2015-09-30 13F MARATHON PETE COM 56585A102 5,938,117 181,856 3.16 275,101 -8.62 0.1806
2015-08-14 2015-06-30 13F MARATHON PETE COM 56585A102 5,756,261 2,858,538 98.65 301,064 1.47 0.1844
2015-05-14 2015-03-31 13F MARATHON PETE COM 56585A102 2,897,723 -451,087 -13.47 296,697 -1.85 0.1874
2015-02-06 2014-12-31 13F MARATHON PETE COM 56585A102 3,348,810 86,432 2.65 302,274 9.43 0.1985
2014-11-13 2014-09-30 13F MARATHON PETE COM 56585A102 3,262,378 43,256 1.34 276,223 9.90 0.1957
2014-08-08 2014-06-30 13F MARATHON PETE COM 56585A102 3,219,122 28,554 0.89 251,342 -9.50 0.1747
2014-05-14 2014-03-31 13F MARATHON PETE COM 56585A102 3,190,568 40,135 1.27 277,717 -3.88 0.2075
2014-02-12 2013-12-31 13F MARATHON PETE COM 56585A102 3,150,433 -93,816 -2.89 288,923 38.46 0.2251
2013-11-13 2013-09-30 13F MARATHON PETE COM 56585A102 3,244,249 -5,879 -0.18 208,673 -9.65 0.1806
2013-08-15 2013-06-30 13F MARATHON PETE COM 56585A102 3,250,128 3,250,128 230,958 0.2175
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.