Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionMartingale Asset Management L P
Latest Disclosed Ownership116,803 shares
Latest Disclosed Value $ 28,520,957
Martingale Asset Management L P reports 5.99% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - Martingale Asset Management L P filed a 13F-HR form disclosing ownership of 116,803 shares of Marathon Petroleum Corporation (MX:MPC) valued at $28,520,957 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 124,244 shares of Marathon Petroleum Corporation. This represents a change in shares of -5.99% 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)
2026-05-13 2026-03-31 13F Marathon Petroleum COM 56585A102 116,803 -7,441 -5.99 28,521 41.15 0.7152
2026-02-13 2025-12-31 13F Marathon Petroleum COM 56585A102 124,244 22,784 22.46 20,206 3.32 0.5137
2025-11-13 2025-09-30 13F Marathon Petroleum COM 56585A102 101,460 84,123 485.22 19,555 579.23 0.4919
2025-08-11 2025-06-30 13F Marathon Petroleum COM 56585A102 17,337 17,337 2,880 0.0706
2025-02-13 2024-12-31 13F Marathon Petroleum COM 56585A102 0 -75,156 -100.00 0 -100.00
2024-11-14 2024-09-30 13F Marathon Petroleum COM 56585A102 75,156 -6,631 -8.11 12,244 -13.71 0.2809
2024-08-12 2024-06-30 13F Marathon Petroleum COM 56585A102 81,787 -10,875 -11.74 14,188 -24.01 0.3067
2024-05-14 2024-03-31 13F Marathon Petroleum COM 56585A102 92,662 45,822 97.83 18,671 168.69 0.3725
2024-02-12 2023-12-31 13F Marathon Petroleum COM 56585A102 46,840 44,216 1,685.06 6,949 1,650.38 0.1418
2023-11-14 2023-09-30 13F Marathon Petroleum COM 56585A102 2,624 0 0.00 397 30.16 0.0084
2023-08-11 2023-06-30 13F Marathon Petroleum COM 56585A102 2,624 -10,522 -80.04 306 -82.79 0.0060
2023-05-12 2023-03-31 13F Marathon Petroleum COM 56585A102 13,146 -310 -2.30 1,772 13.15 0.0342
2023-02-13 2022-12-31 13F Marathon Petroleum COM 56585A102 13,456 10,932 433.12 1,566 523.90 0.0305
2022-11-14 2022-09-30 13F Marathon Petroleum COM 56585A102 2,524 2,524 251 0.0050
2019-05-08 2019-03-31 13F Marathon Petroleum COM 56585A102 0 -3,412 -100.00 0 -100.00
2019-02-11 2018-12-31 13F Marathon Petroleum COM 56585A102 3,412 1 0.03 202 -26.01 0.0027
2018-11-26 2018-09-30 13F/A-2 Marathon Petroleum COM 56585A102 3,411 -40,998 -92.32 273 -91.24 0.0032
2018-11-26 2018-09-30 13F/A-1 Marathon Petroleum COM 56585A102 3,411 0 273 0.0032
2018-11-09 2018-09-30 13F Marathon Petroleum COM 56585A102 3,411 -40,998 273
2018-08-09 2018-06-30 13F Marathon Petroleum COM 56585A102 44,409 -57,917 -56.60 3,116 -58.35 0.0383
2018-05-11 2018-03-31 13F Marathon Petroleum COM 56585A102 102,326 14,093 15.97 7,482 28.51 0.0962
2018-02-12 2017-12-31 13F Marathon Petroleum COM 56585A102 88,233 676 0.77 5,822 18.55 0.0772
2017-11-13 2017-09-30 13F Marathon Petroleum COM 56585A102 87,557 46,003 110.71 4,911 125.79 0.0659
2017-08-10 2017-06-30 13F Marathon Petroleum COM 56585A102 41,554 1,293 3.21 2,175 6.88 0.0307
2017-05-09 2017-03-31 13F Marathon Petroleum COM 56585A102 40,261 -30,545 -43.14 2,035 -42.93 0.0294
2017-02-10 2016-12-31 13F Marathon Petroleum COM 56585A102 70,806 70,806 0.00 3,566 0.0502
2016-08-11 2016-06-30 13F Marathon Petroleum COM 56585A102 0 -100,929 -100.00 0 -100.00
2016-05-13 2016-03-31 13F/A-1 Marathon Petroleum COM 56585A102 100,929 -73,124 -42.01 3,753 -58.41 0.0741
2016-05-11 2016-03-31 13F Marathon Petroleum COM 56585A102 100,929 3,753
2016-02-12 2015-12-31 13F Marathon Petroleum COM 56585A102 174,053 -27,613 -13.69 9,023 -3.44 0.2002
2015-11-12 2015-09-30 13F/A-1 Marathon Petroleum COM 56585A102 201,666 -4,865 -2.36 9,344 -13.51 0.2286
2015-11-12 2015-09-30 13F Marathon Petroleum COM 56585A102 206,531 10,804
2015-08-12 2015-06-30 13F Marathon Petroleum COM 56585A102 206,531 120,678 140.56 10,804 22.90 0.2523
2015-05-12 2015-03-31 13F Marathon Petroleum COM 56585A102 85,853 76,333 801.82 8,791 922.21 0.2101
2015-02-12 2014-12-31 13F Marathon Petroleum COM 56585A102 9,520 -98,571 -91.19 860 -90.60 0.0238
2014-11-17 2014-09-30 13F Marathon Petroleum COM 56585A102 108,091 61,867 133.84 9,153 153.62 0.2846
2014-08-21 2014-06-30 13F/A-1 Marathon Petroleum COM 56585A102 46,224 46,224 3,609 -40.76 0.1129
2014-08-15 2014-06-30 13F Marathon Petroleum COM 56585A102 0 3,609
2014-05-14 2014-03-31 13F Marathon Petroleum COM 56585A102 0 0 6,092 -30.28 0.2069
2014-02-12 2013-12-31 13F Marathon Petroleum COM 56585A102 0 -118,680 -100.00 8,738 14.46 0.3034
2013-11-13 2013-09-30 13F Marathon Petroleum COM 56585A102 118,680 10,729 9.94 7,634 -0.48 0.2720
2013-08-05 2013-06-30 13F Marathon Petroleum COM 56585A102 107,951 107,951 7,671 0.2839
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.