Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionAcadian Asset Management Llc
Latest Disclosed Ownership530,588 shares
Latest Disclosed Value $ 129,526
Acadian Asset Management Llc reports 140.61% increase in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - Acadian Asset Management Llc filed a 13F-HR form disclosing ownership of 530,588 shares of Marathon Petroleum Corporation (MX:MPC) valued at $129,526 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 220,515 shares of Marathon Petroleum Corporation. This represents a change in shares of 140.61% 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 PETE COM 56585A102 530,588 310,073 140.61 130 268.57 0.1838
2026-02-10 2025-12-31 13F MARATHON PETE COM 56585A102 220,515 207,669 1,616.60 36 1,650.00 0.0589
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 12,846 12,002 1,422.04 2 0.0043
2025-08-07 2025-06-30 13F MARATHON PETE COM 56585A102 844 0 0.00 0 0.0003
2025-05-21 2025-03-31 13F MARATHON PETE COM 56585A102 844 -14,737 -94.58 0 -100.00 0.0003
2025-02-11 2024-12-31 13F MARATHON PETE COM 56585A102 15,581 -21,076 -57.50 2 -60.00 0.0063
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 36,657 -412,441 -91.84 6 -93.51 0.0186
2024-08-06 2024-06-30 13F MARATHON PETE COM 56585A102 449,098 -1,214,737 -73.01 78 -77.01 0.2399
2024-05-10 2024-03-31 13F MARATHON PETE COM 56585A102 1,663,835 117,790 7.62 335 46.29 1.1681
2024-02-13 2023-12-31 13F MARATHON PETE COM 56585A102 1,546,045 313,339 25.42 229 23.12 0.8894
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 1,232,706 689,576 126.96 187 195.24 0.7818
2023-08-07 2023-06-30 13F MARATHON PETE COM 56585A102 543,130 -451,539 -45.40 63 -52.99 0.2602
2023-05-11 2023-03-31 13F MARATHON PETE COM 56585A102 994,669 181,426 22.31 134 42.55 0.5879
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 813,243 579,540 247.98 95 -99.59 0.4662
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 233,703 226,508 3,148.13 23,201 3,819.09 0.1269
2022-08-09 2022-06-30 13F MARATHON PETE COM 56585A102 7,195 1,592 28.41 592 23.59 0.0030
2022-05-12 2022-03-31 13F MARATHON PETE COM 56585A102 5,603 910 19.39 479 59.67 0.0020
2022-02-10 2021-12-31 13F MARATHON PETE COM 56585A102 4,693 2,241 91.39 300 98.68 0.0011
2021-11-12 2021-09-30 13F MARATHON PETE COM 56585A102 2,452 -10,557 -81.15 151 -80.79 0.0006
2021-08-11 2021-06-30 13F MARATHON PETE COM 56585A102 13,009 1,204 10.20 786 24.37 0.0030
2021-05-11 2021-03-31 13F MARATHON PETE COM 56585A102 11,805 9,035 326.17 632 449.57 0.0025
2021-02-11 2020-12-31 13F MARATHON PETE COM 56585A102 2,770 -268 -8.82 115 29.21 0.0004
2020-11-09 2020-09-30 13F MARATHON PETE COM 56585A102 3,038 0 0.00 89 -21.93 0.0004
2020-08-12 2020-06-30 13F MARATHON PETE COM 56585A102 3,038 3,038 114 0.0005
2019-05-09 2019-03-31 13F MARATHON PETE COM 56585A102 0 -2,356 -100.00 0 -100.00
2019-02-07 2018-12-31 13F MARATHON PETE COM 56585A102 2,356 -25,946 -91.68 139 -93.86 0.0007
2018-10-30 2018-09-30 13F MARATHON PETE COM 56585A102 28,302 475 1.71 2,263 15.93 0.0093
2018-07-24 2018-06-30 13F MARATHON PETE COM 56585A102 27,827 -15,231 -35.37 1,952 -37.97 0.0084
2018-04-12 2018-03-31 13F MARATHON PETE COM 56585A102 43,058 38,142 775.87 3,147 871.30 0.0136
2018-01-18 2017-12-31 13F MARATHON PETE COM 56585A102 4,916 4,916 324 0.0014
2017-04-25 2017-03-31 13F MARATHON PETE COM 56585A102 0 -8,343 -100.00 0 -100.00
2017-01-19 2016-12-31 13F MARATHON PETE COM 56585A102 8,343 3,732 80.94 420 124.60 0.0020
2016-10-20 2016-09-30 13F MARATHON PETE COM 56585A102 4,611 4,497 3,944.74 187 4,575.00 0.0009
2016-07-19 2016-06-30 13F MARATHON PETE COM 56585A102 114 -2,216,223 -99.99 4 -100.00 0.0000
2016-04-14 2016-03-31 13F MARATHON PETE COM 56585A102 2,216,337 -678,380 -23.44 82,405 -45.09 0.4160
2016-01-14 2015-12-31 13F MARATHON PETE COM 56585A102 2,894,717 205,882 7.66 150,065 20.46 0.7843
2015-10-15 2015-09-30 13F MARATHON PETE COM 56585A102 2,688,835 516,718 23.79 124,574 9.64 0.6794
2015-08-11 2015-06-30 13F MARATHON PETE COM 56585A102 2,172,117 1,561,102 255.49 113,624 81.62 0.5512
2015-04-20 2015-03-31 13F/A-1 MARATHON PETE COM 56585A102 611,015 605,653 11,295.28 62,561 12,799.18 0.2887
2015-04-16 2015-03-31 13F MARATHON PETE COM 56585A102 611,015 62,561
2015-01-23 2014-12-31 13F MARATHON PETE COM 56585A102 5,362 5,226 3,842.65 485 3,941.67 0.0022
2014-10-22 2014-09-30 13F MARATHON PETE COM 56585A102 136 -1,926,581 -99.99 12 -99.99 0.0001
2014-04-22 2014-03-31 13F MARATHON PETE COM 56585A102 1,926,717 570,308 42.05 167,704 34.79 0.8784
2014-01-22 2013-12-31 13F MARATHON PETE COM 56585A102 1,356,409 -697,158 -33.95 124,422 -5.80 0.6929
2013-10-18 2013-09-30 13F MARATHON PETE COM 56585A102 2,053,567 -1,242,633 -37.70 132,086 -43.61 0.8574
2013-08-06 2013-06-30 13F/A-1 MARATHON PETE COM 056585A10 3,296,200 3,296,200 234,228 1.6322
2013-08-05 2013-06-30 13F MARATHON PETE COM 056585A10 6,592,400 468,456 1.6322
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.