Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionGuggenheim Capital Llc
Latest Disclosed Ownership76,184 shares
Latest Disclosed Value $ 18,602,610
Guggenheim Capital Llc reports 8.22% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - Guggenheim Capital Llc filed a 13F-HR form disclosing ownership of 76,184 shares of Marathon Petroleum Corporation (MX:MPC) valued at $18,602,610 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 83,008 shares of Marathon Petroleum Corporation. This represents a change in shares of -8.22% 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)
2026-05-15 2026-03-31 13F MARATHON PETE COM 56585A102 76,184 -6,824 -8.22 18,603 37.80 0.0719
2026-02-17 2025-12-31 13F MARATHON PETE COM 56585A102 83,008 -16,205 -16.33 13,500 -29.41 0.0967
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 99,213 -5,253 -5.03 19,122 10.20 0.1388
2025-08-13 2025-06-30 13F MARATHON PETE COM 56585A102 104,466 1,939 1.89 17,353 16.17 0.1377
2025-05-14 2025-03-31 13F MARATHON PETE COM 56585A102 102,527 -11,041 -9.72 14,937 -5.71 0.1372
2025-02-13 2024-12-31 13F MARATHON PETE COM 56585A102 113,568 -3,197 -2.74 15,843 -16.72 0.1284
2024-11-13 2024-09-30 13F MARATHON PETE COM 56585A102 116,765 -52,233 -30.91 19,022 -35.12 0.1331
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 168,998 -6,663 -3.79 29,318 -17.17 0.2079
2024-05-14 2024-03-31 13F MARATHON PETE COM 56585A102 175,661 -10,457 -5.62 35,396 28.19 0.2494
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 186,118 -8,548 -4.39 27,612 -6.27 0.2086
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 194,666 -4,180 -2.10 29,461 27.06 0.2533
2023-08-11 2023-06-30 13F MARATHON PETE COM 56585A102 198,846 13,617 7.35 23,185 -7.16 0.1820
2023-05-11 2023-03-31 13F MARATHON PETE COM 56585A102 185,229 3,015 1.65 24,974 17.76 0.2102
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 182,214 -21,565 -10.58 21,208 4.77 0.1863
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 203,779 -13,158 -6.07 20,241 13.50 0.1854
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 216,937 -100,781 -31.72 17,834 -34.35 0.1408
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 317,718 -6,112 -1.89 27,165 31.09 0.1634
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 323,830 11,856 3.80 20,722 7.46 0.1081
2021-11-15 2021-09-30 13F MARATHON PETE COM 56585A102 311,974 -44,682 -12.53 19,284 -10.51 0.1158
2021-08-13 2021-06-30 13F MARATHON PETE COM 56585A102 356,656 16,464 4.84 21,549 18.42 0.1269
2021-05-13 2021-03-31 13F MARATHON PETE COM 56585A102 340,192 -45,057 -11.70 18,197 14.21 0.1195
2021-02-16 2020-12-31 13F MARATHON PETE COM 56585A102 385,249 35,413 10.12 15,933 55.23 0.0999
2020-11-13 2020-09-30 13F MARATHON PETE COM 56585A102 349,836 -173,383 -33.14 10,264 -47.52 0.0743
2020-08-14 2020-06-30 13F MARATHON PETE COM 56585A102 523,219 221,373 73.34 19,559 174.28 0.1513
2020-06-02 2020-03-31 13F MARATHON PETE COM 56585A102 301,846 25,434 9.20 7,131 -57.18 0.0718
2020-02-20 2019-12-31 13F/A-1 MARATHON PETE COM 56585A102 276,412 -46,156 -14.31 16,653 -15.02 0.1251
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 276,412 -46,156 16,653 98,699.0022
2020-02-20 2019-09-30 13F/A-1 MARATHON PETE COM 56585A102 322,568 19,158 6.31 19,596 15.58 0.1566
2019-11-14 2019-09-30 13F MARATHON PETE COM 56585A102 322,568 19,158 19,596 143,605.2360
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 303,410 105,880 53.60 16,954 43.40 0.1380
2019-05-15 2019-03-31 13F MARATHON PETE COM 56585A102 197,530 13,969 7.61 11,823 9.15 0.0963
2019-02-14 2018-12-31 13F MARATHON PETE COM 56585A102 183,561 30,975 20.30 10,832 -11.23 0.0918
2018-11-14 2018-09-30 13F MARATHON PETE COM 56585A102 152,586 -1,640 -1.06 12,202 12.77 0.0795
2018-08-14 2018-06-30 13F MARATHON PETE COM 56585A102 154,226 -768,110 -83.28 10,820 -83.95 0.0722
2018-05-15 2018-03-31 13F MARATHON PETE COM 56585A102 922,336 -113,495 -10.96 67,432 -1.33 0.1645
2018-02-14 2017-12-31 13F MARATHON PETE COM 56585A102 1,035,831 -73,817 -6.65 68,343 9.82 0.1619
2017-11-14 2017-09-30 13F MARATHON PETE COM 56585A102 1,109,648 55,336 5.25 62,231 12.79 0.1462
2017-08-14 2017-06-30 13F MARATHON PETE COM 56585A102 1,054,312 -99,846 -8.65 55,173 -5.41 0.1461
2017-05-15 2017-03-31 13F MARATHON PETE COM 56585A102 1,154,158 -115,020 -9.06 58,331 -8.72 0.1581
2017-02-14 2016-12-31 13F MARATHON PETE COM 56585A102 1,269,178 239,999 23.32 63,901 52.97 0.1828
2016-11-14 2016-09-30 13F MARATHON PETE COM 56585A102 1,029,179 -149,569 -12.69 41,773 -6.64 0.1299
2016-08-15 2016-06-30 13F MARATHON PETE COM 56585A102 1,178,748 89,805 8.25 44,745 10.52 0.1405
2016-05-16 2016-03-31 13F MARATHON PETE COM 56585A102 1,088,943 189,555 21.08 40,487 -13.16 0.1277
2016-02-16 2015-12-31 13F MARATHON PETE COM 56585A102 899,388 -69,739 -7.20 46,625 3.84 0.1357
2015-11-16 2015-09-30 13F MARATHON PETE COM 56585A102 969,127 -51,079 -5.01 44,902 -15.87 0.1382
2015-08-14 2015-06-30 13F MARATHON PETE COM 56585A102 1,020,206 510,808 100.28 53,369 2.33 0.1317
2015-05-18 2015-03-31 13F/A-1 MARATHON PETE COM 56585A102 509,398 -30,441 -5.64 52,156 7.04 0.1234
2015-05-15 2015-03-31 13F MARATHON PETE COM 56585A102 509,398 52,156
2015-02-17 2014-12-31 13F MARATHON PETE COM 56585A102 539,839 126,807 30.70 48,727 39.34 0.1222
2014-11-14 2014-09-30 13F MARATHON PETE COM 56585A102 413,032 32,003 8.40 34,971 17.56 0.0844
2014-08-14 2014-06-30 13F MARATHON PETE COM 56585A102 381,029 -500,286 -56.77 29,747 -61.22 0.0753
2014-05-16 2014-03-31 13F MARATHON PETE COM 56585A102 881,315 220,804 33.43 76,709 26.61 0.2182
2014-02-14 2013-12-31 13F MARATHON PETE COM 56585A102 660,511 248,992 60.51 60,589 128.91 0.1841
2013-11-14 2013-09-30 13F MARATHON PETE COM 56585A102 411,519 57,652 16.29 26,469 5.26 0.0950
2013-08-22 2013-06-30 13F/A-1 MARATHON PETE COM 56585A102 353,867 353,867 25,147 0.1058
2013-08-14 2013-06-30 13F MARATHON PETE COM 56585A102 353,867 25,147 0.1060
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.