Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionO'shaughnessy Asset Management, Llc
Latest Disclosed Ownership277,003 shares
Latest Disclosed Value $ 67,638,592
O'shaughnessy Asset Management, Llc reports 0.21% increase in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - O'shaughnessy Asset Management, Llc filed a 13F-HR form disclosing ownership of 277,003 shares of Marathon Petroleum Corporation (MX:MPC) valued at $67,638,592 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 276,436 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.21% 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 277,003 567 0.21 67,639 50.45 0.3158
2026-02-11 2025-12-31 13F MARATHON PETE COM 56585A102 276,436 -5,023 -1.78 44,957 -17.13 0.2481
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 281,459 -28,447 -9.18 54,248 5.38 0.3186
2025-08-12 2025-06-30 13F MARATHON PETE COM 56585A102 309,906 -47,513 -13.29 51,478 -1.14 0.3509
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 357,419 -80,253 -18.34 52,072 -14.71 0.4183
2025-02-12 2024-12-31 13F MARATHON PETE COM 56585A102 437,672 -43,055 -8.96 61,055 -21.84 0.5179
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 480,727 -1,486 -0.31 78,118 -6.62 0.6970
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 482,213 -27,342 -5.37 83,654 -18.53 0.8638
2024-05-13 2024-03-31 13F MARATHON PETE COM 56585A102 509,555 8,228 1.64 102,675 38.05 1.1366
2024-02-09 2023-12-31 13F MARATHON PETE COM 56585A102 501,327 -77,400 -13.37 74,377 -15.08 0.9859
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 578,727 -145,058 -20.04 87,585 3.78 1.3012
2023-08-11 2023-06-30 13F MARATHON PETE COM 56585A102 723,785 -125,994 -14.83 84,393 -26.34 1.2520
2023-05-12 2023-03-31 13F MARATHON PETE COM 56585A102 849,779 -1,642 -0.19 114,576 15.62 1.8019
2023-02-10 2022-12-31 13F MARATHON PETE COM 56585A102 851,421 49,523 6.18 99,097 24.41 1.6160
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 801,898 146,837 22.42 79,653 47.91 1.4966
2022-08-11 2022-06-30 13F MARATHON PETE COM 56585A102 655,061 273,092 71.50 53,853 64.89 0.9937
2022-05-13 2022-03-31 13F MARATHON PETE COM 56585A102 381,969 229,138 149.93 32,659 233.97 0.5433
2022-02-11 2021-12-31 13F MARATHON PETE COM 56585A102 152,831 35,314 30.05 9,779 34.62 0.1737
2021-11-10 2021-09-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 117,517 112,692 2,335.59 7,264 2,387.67 0.1483
2021-08-09 2021-06-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 4,825 1,272 35.80 292 53.68 0.0058
2021-05-14 2021-03-31 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 3,553 -69 -1.91 190 26.67 0.0042
2021-02-11 2020-12-31 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 3,622 2,537 233.82 150 368.75 0.0041
2020-11-12 2020-09-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 1,085 167 18.19 32 -5.88 0.0010
2020-08-13 2020-06-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 918 511 125.55 34 240.00 0.0011
2020-05-13 2020-03-31 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 407 -677 -62.45 10 -84.62 0.0004
2020-02-12 2019-12-31 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 1,084 -391,245 -99.72 65 -99.73 0.0014
2019-11-14 2019-09-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 392,329 -578,337 -59.58 23,835 -56.00 0.5671
2019-08-07 2019-06-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 970,666 -281,022 -22.45 54,169 -27.54 1.2662
2019-05-10 2019-03-31 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 1,251,688 -651,079 -34.22 74,753 -33.47 1.7810
2019-02-11 2018-12-31 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 1,902,767 -122,893 -6.07 112,353 -30.41 2.8415
2018-11-06 2018-09-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 2,025,660 385,033 23.47 161,444 40.63 3.3042
2018-08-10 2018-06-30 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 1,640,627 529,639 47.67 114,801 41.34 2.4277
2018-05-08 2018-03-31 13F MARATHON PETROLEUM CORP COM USD0.01 COMMON 56585A102 1,110,988 549,298 97.79 81,226 119.17 1.7771
2018-02-13 2017-12-31 13F MARATHON PETE CORP COM COMMON 56585A102 561,690 484,852 631.01 37,060 760.06 0.8648
2017-11-13 2017-09-30 13F MARATHON PETE CORP COM COMMON 56585A102 76,838 25,265 48.99 4,309 59.65 0.1003
2017-08-14 2017-06-30 13F MARATHON PETE CORP COM COMMON 56585A102 51,573 3,557 7.41 2,699 11.21 0.0634
2017-05-11 2017-03-31 13F MARATHON PETE CORP COM COMMON 56585A102 48,016 7,728 19.18 2,427 -4.71 0.0572
2017-02-10 2016-12-31 13F MARATHON PETE CORP COM COMMON 56585A102 40,288 -17,446 -30.22 2,547 8.71 0.0602
2016-11-10 2016-09-30 13F MARATHON PETE CORP COM COMMON 56585A102 57,734 -26,115 -31.15 2,343 -26.39 0.0548
2016-08-11 2016-06-30 13F MARATHON PETE CORP COM COMMON 56585A102 83,849 -440,695 -84.01 3,183 -83.41 0.0824
2016-05-13 2016-03-31 13F MARATHON PETE CORP COM COMMON 56585A102 524,544 -568,034 -51.99 19,188 -66.12 0.4813
2016-02-11 2015-12-31 13F MARATHON PETE CORP COM COMMON 56585A102 1,092,578 -623,116 -36.32 56,639 -28.75 1.4001
2015-11-12 2015-09-30 13F MARATHON PETE CORP COM COMMON 56585A102 1,715,694 -685,489 -28.55 79,488 -36.72 1.6542
2015-08-05 2015-06-30 13F MARATHON PETE CORP COM COMMON 56585A102 2,401,183 991,983 70.39 125,606 -12.88 2.5463
2015-05-06 2015-03-31 13F MARATHON PETROLEUM COMMON 56585A102 1,409,200 -126,953 -8.26 144,170 4.38 2.8065
2015-02-12 2014-12-31 13F MARATHON PETROLEUM COMMON 56585A102 1,536,153 -88,399 -5.44 138,116 0.58 2.6425
2014-11-17 2014-09-30 13F MARATHON PETROLEUM COMMON 56585A102 1,624,552 190,553 13.29 137,325 22.72 2.5183
2014-08-14 2014-06-30 13F MARATHON PETROLEUM COMMON 56585A102 1,433,999 400,742 38.78 111,899 24.60 2.0961
2014-05-15 2014-03-31 13F MARATHON PETROLEUM COMMON 56585A102 1,033,257 425,546 70.02 89,807 61.39 1.7812
2014-02-13 2013-12-31 13F/A-1 MARATHON PETROLEUM COMMON 56585A102 607,711 317,830 109.64 55,645 198.77 1.1682
2014-02-13 2013-12-31 13F MARATHON PETROLEUM COMMON 56585A102 165,577 11,770
2013-11-12 2013-09-30 13F MARATHON PETROLEUM COMMON 56585A102 289,881 124,304 75.07 18,625 58.24 0.4470
2013-08-13 2013-06-30 13F MARATHON PETROLEUM COMMON 56585A102 165,577 165,577 11,770 0.3138
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.