Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionStephens Inc /ar/
Latest Disclosed Ownership8,516 shares
Latest Disclosed Value $ 2,124,525
Stephens Inc /ar/ reports 1.42% increase in ownership of MPC / Marathon Petroleum Corporation

On April 28, 2026 - Stephens Inc /ar/ filed a 13F-HR form disclosing ownership of 8,516 shares of Marathon Petroleum Corporation (US:MPC) valued at $2,079,437 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 8,397 shares of Marathon Petroleum Corporation. This represents a change in shares of 1.42% during the quarter. The current value of the position is $2,275,560 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.

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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)
2026-04-28 2026-03-31 13F MARATHON PETE COM 56585A102 8,516 119 1.42 2,125 51.93 0.0266
2026-02-05 2025-12-31 13F MARATHON PETE COM 56585A102 8,397 -219 -2.54 1,398 -15.78 0.0174
2025-10-27 2025-09-30 13F MARATHON PETE COM 56585A102 8,616 -435 -4.81 1,661 10.45 0.0212
2025-07-29 2025-06-30 13F MARATHON PETE COM 56585A102 9,051 55 0.61 1,503 14.73 0.0207
2025-05-01 2025-03-31 13F MARATHON PETE COM 56585A102 8,996 477 5.60 1,311 10.27 0.0192
2025-01-28 2024-12-31 13F MARATHON PETE COM 56585A102 8,519 -384 -4.31 1,188 -18.07 0.0167
2024-10-28 2024-09-30 13F MARATHON PETE COM 56585A102 8,903 -967 -9.80 1,450 -15.30 0.0206
2024-08-06 2024-06-30 13F MARATHON PETE COM 56585A102 9,870 228 2.36 1,712 -11.84 0.0261
2024-05-15 2024-03-31 13F MARATHON PETE COM 56585A102 9,642 -375 -3.74 1,943 30.69 0.0301
2024-02-13 2023-12-31 13F MARATHON PETE COM 56585A102 10,017 -97 -0.96 1,486 -2.88 0.0256
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 10,114 -58 -0.57 1,531 29.01 0.0293
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 10,172 -121 -1.18 1,186 -14.49 0.0213
2023-05-15 2023-03-31 13F MARATHON PETE COM 56585A102 10,293 -1,183 -10.31 1,388 3.90 0.0266
2023-02-14 2022-12-31 13F/A-1 MARATHON PETE COM 56585A102 11,476 -1,160 -9.18 1,336 6.37 0.0274
2023-01-25 2022-12-31 13F MARATHON PETE OM 56585A102 11,476 -1,160 1 0.0274
2022-11-02 2022-09-30 13F MARATHON PETE OM 56585A102 12,636 -3,490 -21.64 1,255 -5.35 0.0268
2022-08-03 2022-06-30 13F MARATHON PETE OM 56585A102 16,126 -1,251 -7.20 1,326 -10.77 0.0268
2022-05-04 2022-03-31 13F MARATHON PETE OM 56585A102 17,377 1,085 6.66 1,486 42.47 0.0242
2022-03-07 2021-12-31 13F MARATHON PETE OM 56585A102 16,292 -5,843 -26.40 1,043 -23.76 0.0158
2021-10-27 2021-09-30 13F MARATHON PETE COM 56585A102 22,135 -8,760 -28.35 1,368 -26.73 0.0212
2021-08-12 2021-06-30 13F MARATHON PETE COM 56585A102 30,895 -19,400 -38.57 1,867 -30.59 0.0280
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 50,295 1,054 2.14 2,690 32.06 0.0442
2021-02-10 2020-12-31 13F MARATHON PETE COM 56585A102 49,241 -1,086 -2.16 2,037 37.91 0.0365
2020-11-13 2020-09-30 13F MARATHON PETE COM 56585A102 50,327 -5,395 -9.68 1,477 -29.09 0.0291
2020-08-24 2020-06-30 13F MARATHON PETE COM 56585A102 55,722 -2,977 -5.07 2,083 50.29 0.0448
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 58,699 -37,231 -38.81 1,386 -76.02 0.0369
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 95,930 -61,382 -39.02 5,780 -39.52 0.1211
2019-10-18 2019-09-30 13F MARATHON PETE COM 56585A102 157,312 -8,782 -5.29 9,557 2.97 0.2103
2019-08-01 2019-06-30 13F MARATHON PETE COM 56585A102 166,094 77,563 87.61 9,281 75.15 0.2102
2019-05-03 2019-03-31 13F MARATHON PETE COM 56585A102 88,531 345 0.39 5,299 1.83 0.1257
2019-02-11 2018-12-31 13F MARATHON PETE COM 56585A102 88,186 -1,491 -1.66 5,204 -27.43 0.1476
2018-11-14 2018-09-30 13F MARATHON PETE COM 56585A102 89,677 -19,569 -17.91 7,171 -6.44 0.1784
2018-08-10 2018-06-30 13F MARATHON PETE COM 56585A102 109,246 4,990 4.79 7,665 0.56 0.2316
2018-05-03 2018-03-31 13F MARATHON PETE COM 56585A102 104,256 16,218 18.42 7,622 31.21 0.2842
2018-02-05 2017-12-31 13F MARATHON PETE COM 56585A102 88,038 16,726 23.45 5,809 45.26 0.2173
2017-11-08 2017-09-30 13F MARATHON PETE COM 56585A102 71,312 -15,822 -18.16 3,999 -12.30 0.1444
2017-08-10 2017-06-30 13F MARATHON PETE COM 56585A102 87,134 -11,490 -11.65 4,560 -8.51 0.1564
2017-05-11 2017-03-31 13F MARATHON PETE COM 56585A102 98,624 2,050 2.12 4,984 2.51 0.1812
2017-02-09 2016-12-31 13F MARATHON PETE COM 56585A102 96,574 15,996 19.85 4,862 48.64 0.1982
2016-11-30 2016-09-30 13F/A-2 MARATHON PETE COM 56585A102 80,578 -2,417 -2.91 3,271 3.84 0.1432
2016-11-10 2016-09-30 13F MARATHON PETE COM 56585A102 80,578 3,271
2016-08-05 2016-06-30 13F MARATHON PETE COM 56585A102 82,995 5,770 7.47 3,150 9.72 0.1405
2016-05-05 2016-03-31 13F MARATHON PETE COM 56585A102 77,225 444 0.58 2,871 -27.86 0.1405
2016-02-10 2015-12-31 13F MARATHON PETE COM 56585A102 76,781 4,360 6.02 3,980 18.63 0.1996
2015-11-03 2015-09-30 13F MARATHON PETE COM 56585A102 72,421 -3,301 -4.36 3,355 -15.30 0.1747
2015-07-29 2015-06-30 13F MARATHON PETE COM 56585A102 75,722 34,853 85.28 3,961 -5.35 0.1797
2015-05-06 2015-03-31 13F MARATHON PETE COM 56585A102 40,869 357 0.88 4,185 14.44 0.1907
2015-02-12 2014-12-31 13F MARATHON PETE COM 56585A102 40,512 2,228 5.82 3,657 12.84 0.1731
2014-11-14 2014-09-30 13F MARATHON PETE COM 56585A102 38,284 769 2.05 3,241 10.65 0.1603
2014-08-15 2014-06-30 13F MARATHON PETE COM 56585A102 37,515 -591 -1.55 2,929 -11.70 0.1475
2014-05-13 2014-03-31 13F MARATHON PETE COM 56585A102 38,106 1,120 3.03 3,317 -2.24 0.1808
2014-02-14 2013-12-31 13F MARATHON PETE COM 56585A102 36,986 239 0.65 3,393 43.53 0.1684
2013-11-06 2013-09-30 13F MARATHON PETE COM 56585A102 36,747 1,568 4.46 2,364 -5.44 0.1274
2013-08-12 2013-06-30 13F MARATHON PETE COM 56585A102 35,179 35,179 2,500 0.1396
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.