Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionGabelli Funds Llc
Latest Disclosed Ownership215,000 shares
Latest Disclosed Value $ 52,498,700
Gabelli Funds Llc reports 6.89% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 14, 2026 - Gabelli Funds Llc filed a 13F-HR form disclosing ownership of 215,000 shares of Marathon Petroleum Corporation (MX:MPC) valued at $52,498,700 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 230,900 shares of Marathon Petroleum Corporation. This represents a change in shares of -6.89% 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 PETROLEUM EQUITY 56585A102 215,000 -15,900 -6.89 52,499 39.80 0.3546
2026-02-05 2025-12-31 13F MARATHON PETROLEUM EQUITY 56585A102 230,900 31,200 15.62 37,551 -2.44 0.2542
2025-11-12 2025-09-30 13F MARATHON PETROLEUM EQUITY 56585A102 199,700 -29,100 -12.72 38,490 1.28 0.2605
2025-08-13 2025-06-30 13F MARATHON PETROLEUM EQUITY 56585A102 228,800 -3,300 -1.42 38,006 12.39 0.2698
2025-05-14 2025-03-31 13F MARATHON PETROLEUM EQUITY 56585A102 232,100 -2,100 -0.90 33,815 3.50 0.2577
2025-02-13 2024-12-31 13F MARATHON PETROLEUM EQUITY 56585A102 234,200 -6,050 -2.52 32,671 -16.53 0.2454
2024-11-13 2024-09-30 13F MARATHON PETROLEUM EQUITY 56585A102 240,250 4,900 2.08 39,139 -4.14 0.2821
2024-08-13 2024-06-30 13F MARATHON PETROLEUM EQUITY 56585A102 235,350 25,356 12.07 40,829 -3.51 0.3101
2024-05-14 2024-03-31 13F MARATHON PETROLEUM EQUITY 56585A102 209,994 -46,400 -18.10 42,314 11.24 0.3117
2024-02-13 2023-12-31 13F MARATHON PETROLEUM EQUITY 56585A102 256,394 500 0.20 38,039 -1.78 0.2929
2023-11-08 2023-09-30 13F MARATHON PETROLEUM EQUITY 56585A102 255,894 -9,500 -3.58 38,727 25.15 0.3142
2023-08-10 2023-06-30 13F MARATHON PETROLEUM EQUITY 56585A102 265,394 -7,795 -2.85 30,945 -15.99 0.2345
2023-05-12 2023-03-31 13F MARATHON PETROLEUM EQUITY 56585A102 273,189 -10,600 -3.74 36,834 11.52 0.2792
2023-02-13 2022-12-31 13F MARATHON PETROLEUM EQUITY 56585A102 283,789 -24,000 -7.80 33,030 8.04 0.2567
2022-11-14 2022-09-30 13F/A-1 MARATHON PETE CORP COM COM 56585A102 307,789 30,900 11.16 30,573 34.31 0.2520
2022-11-10 2022-09-30 13F MARATHON PETE CORP COM COM 56585A102 307,789 30,900 30,573 0.2520
2022-08-12 2022-06-30 13F MARATHON PETE CORP COM COM 56585A102 276,889 -500 -0.18 22,763 -4.02 0.1748
2022-05-18 2022-03-31 13F/A-1 MARATHON PETE CORP COM COM 56585A102 277,389 -112,800 -28.91 23,717 -5.01 0.1558
2022-05-13 2022-03-31 13F MARATHON PETE CORP COM COM 56585A102 277,389 -112,800 23,717 0.1601
2022-02-11 2021-12-31 13F MARATHON PETE CORP COM COM 56585A102 390,189 15,250 4.07 24,968 7.74 0.1576
2021-11-12 2021-09-30 13F MARATHON PETE CORP COM COM 56585A102 374,939 -59,150 -13.63 23,175 -11.64 0.1535
2021-08-13 2021-06-30 13F MARATHON PETE CORP COM COM 56585A102 434,089 61,000 16.35 26,228 31.42 0.1670
2021-05-14 2021-03-31 13F MARATHON PETE CORP COM COM 56585A102 373,089 -72,500 -16.27 19,957 8.29 0.1338
2021-02-05 2020-12-31 13F MARATHON PETE CORP COM COM 56585A102 445,589 -53,800 -10.77 18,430 25.78 0.1313
2020-11-06 2020-09-30 13F MARATHON PETE CORP COM COM 56585A102 499,389 -18,850 -3.64 14,652 -24.37 0.1142
2020-08-13 2020-06-30 13F MARATHON PETE CORP COM COM 56585A102 518,239 61,350 13.43 19,372 79.50 0.1579
2020-05-14 2020-03-31 13F MARATHON PETE CORP COM COM 56585A102 456,889 -17,600 -3.71 10,792 -62.25 0.0961
2020-02-14 2019-12-31 13F MARATHON PETE CORP COM COM 56585A102 474,489 -127,100 -21.13 28,588 -21.78 0.1849
2019-11-01 2019-09-30 13F MARATHON PETE CORP COM COM 56585A102 601,589 28,000 4.88 36,547 14.02 0.2414
2019-08-02 2019-06-30 13F MARATHON PETE CORP COM COM 56585A102 573,589 -14,431 -2.45 32,052 -8.93 0.2058
2019-05-02 2019-03-31 13F MARATHON PETE CORP COM COM 56585A102 588,020 -162 -0.03 35,193 1.39 0.2213
2019-01-30 2018-12-31 13F MARATHON PETE CORP COM COM 56585A102 588,182 116,682 24.75 34,709 -7.95 0.2380
2018-11-02 2018-09-30 13F MARATHON PETE CORP COM COM 56585A102 471,500 -2,100 -0.44 37,706 13.48 0.2163
2018-08-10 2018-06-30 13F MARATHON PETE CORP COM COM 56585A102 473,600 18,500 4.07 33,228 -0.13 0.1968
2018-05-09 2018-03-31 13F MARATHON PETE CORP COM COM 56585A102 455,100 500 0.11 33,272 10.93 0.1985
2018-02-02 2017-12-31 13F MARATHON PETE CORP COM COM 56585A102 454,600 -8,000 -1.73 29,995 15.62 0.1728
2017-11-01 2017-09-30 13F MARATHON PETE CORP COM COM 56585A102 462,600 5,500 1.20 25,943 8.46 0.1486
2017-08-03 2017-06-30 13F MARATHON PETE CORP COM COM 56585A102 457,100 40,000 9.59 23,920 13.47 0.1421
2017-05-04 2017-03-31 13F MARATHON PETE CORP COM COM 56585A102 417,100 -58,600 -12.32 21,080 -11.99 0.1243
2017-02-10 2016-12-31 13F MARATHON PETE CORP COM COM 56585A102 475,700 55,000 13.07 23,951 40.26 0.1417
2016-11-10 2016-09-30 13F MARATHON PETE CORP COM COM 56585A102 420,700 -88,300 -17.35 17,076 -11.62 0.1013
2016-08-04 2016-06-30 13F MARATHON PETE CORP COM COM 56585A102 509,000 -49,500 -8.86 19,322 -6.95 0.1140
2016-05-05 2016-03-31 13F MARATHON PETE CORP COM COM 56585A102 558,500 15,500 2.85 20,765 -26.23 0.1252
2016-02-05 2015-12-31 13F MARATHON PETE CORP COM COM 56585A102 543,000 -197,000 -26.62 28,149 -17.89 0.1704
2015-10-23 2015-09-30 13F MARATHON PETE CORP COM COM 56585A102 740,000 -37,800 -4.86 34,284 -15.74 0.2038
2015-08-05 2015-06-30 13F MARATHON PETE CORP COM COM 56585A102 777,800 285,300 57.93 40,687 -19.32 0.2130
2015-05-01 2015-03-31 13F MARATHON PETE CORP COM COM 56585A102 492,500 60,000 13.87 50,427 29.18 0.2559
2015-02-05 2014-12-31 13F MARATHON PETE CORP COM COM 56585A102 432,500 90,000 26.28 39,037 34.61 0.1898
2014-10-30 2014-09-30 13F MARATHON PETE CORP COM COM 56585A102 342,500 182,500 114.06 28,999 132.16 0.1472
2014-08-06 2014-06-30 13F MARATHON PETE CORP COM COM 56585A102 160,000 -117,700 -42.38 12,491 -48.32 0.0617
2014-05-16 2014-03-31 13F/A-1 MARATHON PETE CORP COM COM 56585A102 277,700 -142,700 -33.94 24,171 -37.32 0.1255
2014-05-02 2014-03-31 13F MARATHON PETE CORP COM COM 56585A102 277,700 24,171
2014-02-07 2013-12-31 13F MARATHON PETE CORP COM COM 56585A102 420,400 -56,300 -11.81 38,563 25.77 0.2053
2013-11-07 2013-09-30 13F MARATHON PETE CORP COM COM 56585A102 476,700 265,000 125.18 30,661 103.82 0.1745
2013-08-02 2013-06-30 13F/A-1 MARATHON PETE CORP COM COM 56585A102 211,700 211,700 15,043 0.0913
2013-08-01 2013-06-30 13F MARATHON PETE CORP COM COM 56585A102 211,700 15,043 0.0913
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.