Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionAmerican Century Companies Inc
Latest Disclosed Ownership154,450 shares
Latest Disclosed Value $ 37,713,820
American Century Companies Inc reports 15.50% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - American Century Companies Inc filed a 13F-HR form disclosing ownership of 154,450 shares of Marathon Petroleum Corporation (MX:MPC) valued at $37,713,820 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 133,728 shares of Marathon Petroleum Corporation. This represents a change in shares of 15.50% 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 154,450 20,722 15.50 37,714 73.41 0.0194
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 133,728 1,693 1.28 21,749 -14.54 0.0109
2025-11-12 2025-09-30 13F MARATHON PETE COM 56585A102 132,035 -231,741 -63.70 25,449 -57.89 0.0129
2025-08-12 2025-06-30 13F MARATHON PETE COM 56585A102 363,776 24,913 7.35 60,427 22.40 0.0328
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 338,863 53,755 18.85 49,369 24.13 0.0303
2025-02-11 2024-12-31 13F MARATHON PETE COM 56585A102 285,108 -52,256 -15.49 39,773 -27.63 0.0228
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 337,364 -44,474 -11.65 54,960 -17.03 0.0319
2024-08-07 2024-06-30 13F MARATHON PETE COM 56585A102 381,838 -154,715 -28.83 66,241 -38.73 0.0405
2024-05-14 2024-03-31 13F MARATHON PETE COM 56585A102 536,553 -101,541 -15.91 108,115 14.21 0.0679
2024-02-13 2023-12-31 13F MARATHON PETE COM 56585A102 638,094 876 0.14 94,668 -1.83 0.0651
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 637,218 74,389 13.22 96,437 46.95 0.0754
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 562,829 -35,106 -5.87 65,626 -18.52 0.0495
2023-05-11 2023-03-31 13F MARATHON PETE COM 56585A102 597,935 -51,923 -7.99 80,537 6.48 0.0635
2023-02-13 2022-12-31 13F MARATHON PETE COM 56585A102 649,858 354,113 119.74 75,637 157.48 0.0618
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 295,745 185,301 167.78 29,376 223.56 0.0259
2022-08-12 2022-06-30 13F MARATHON PETE COM 56585A102 110,444 45,199 69.28 9,079 62.74 0.0074
2022-05-11 2022-03-31 13F MARATHON PETE COM 56585A102 65,245 29,642 83.26 5,579 144.80 0.0038
2022-02-07 2021-12-31 13F MARATHON PETE COM 56585A102 35,603 -409,978 -92.01 2,279 -91.73 0.0014
2021-11-10 2021-09-30 13F MARATHON PETE COM 56585A102 445,581 219,815 97.36 27,541 101.90 0.0189
2021-08-05 2021-06-30 13F MARATHON PETE COM 56585A102 225,766 210,060 1,337.45 13,641 1,523.93 0.0093
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 15,706 7,164 83.87 840 137.96 0.0006
2021-02-12 2020-12-31 13F MARATHON PETE COM 56585A102 8,542 1,412 19.80 353 68.90 0.0003
2020-11-13 2020-09-30 13F MARATHON PETE COM 56585A102 7,130 994 16.20 209 -8.73 0.0002
2020-08-13 2020-06-30 13F MARATHON PETE COM 56585A102 6,136 6,136 229 0.0002
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 0 -18,591 -100.00 0 -100.00
2020-02-12 2019-12-31 13F MARATHON PETE COM 56585A102 18,591 9,643 107.77 1,120 105.88 0.0011
2019-11-13 2019-09-30 13F MARATHON PETE COM 56585A102 8,948 8,948 544 0.0005
2019-05-14 2019-03-31 13F MARATHON PETE COM 56585A102 0 -901,018 -100.00 0 -100.00
2019-02-12 2018-12-31 13F MARATHON PETE COM 56585A102 901,018 -397,457 -30.61 53,169 -48.80 0.0607
2018-11-02 2018-09-30 13F MARATHON PETE COM 56585A102 1,298,475 -557,598 -30.04 103,839 -20.26 0.1012
2018-08-08 2018-06-30 13F MARATHON PETE COM 56585A102 1,856,073 -740,713 -28.52 130,222 -31.41 0.1311
2018-05-03 2018-03-31 13F MARATHON PETE COM 56585A102 2,596,786 785,895 43.40 189,851 58.89 0.1929
2018-02-02 2017-12-31 13F MARATHON PETE COM 56585A102 1,810,891 -400,619 -18.12 119,483 -3.66 0.1190
2017-11-01 2017-09-30 13F MARATHON PETE COM 56585A102 2,211,510 -413,240 -15.74 124,021 -9.71 0.1255
2017-08-07 2017-06-30 13F MARATHON PETE COM 56585A102 2,624,750 582,010 28.49 137,353 33.04 0.1421
2017-05-02 2017-03-31 13F MARATHON PETE COM 56585A102 2,042,740 2,018,290 8,254.76 103,240 8,286.68 0.1072
2017-02-03 2016-12-31 13F MARATHON PETE COM 56585A102 24,450 24,450 0.00 1,231 0.0013
2016-08-16 2016-06-30 13F/A-1 MARATHON PETE COM 56585A102 0 -26,434 -100.00 0 -100.00
2016-05-02 2016-03-31 13F MARATHON PETE COM 56585A102 26,434 -8,582 -24.51 983 -45.84 0.0011
2016-02-01 2015-12-31 13F MARATHON PETE COM 56585A102 35,016 -357,247 -91.07 1,815 -90.01 0.0021
2015-11-02 2015-09-30 13F MARATHON PETE COM 56585A102 392,263 -184,544 -31.99 18,174 -39.77 0.0222
2015-07-28 2015-06-30 13F MARATHON PETE COM 56585A102 576,807 332,664 136.26 30,173 20.70 0.0339
2015-05-06 2015-03-31 13F MARATHON PETE COM 56585A102 244,143 244,143 0.00 24,998 0.0279
2015-01-27 2014-12-31 13F MARATHON PETE COM 56585A102 0 -4,831 -100.00 0 -100.00
2014-11-07 2014-09-30 13F MARATHON PETE COM 56585A102 4,831 -828,095 -99.42 409 -99.44 0.0005
2014-05-05 2014-03-31 13F MARATHON PETE COM 56585A102 832,926 -313,227 -27.33 72,498 -31.04 0.0857
2014-02-06 2013-12-31 13F MARATHON PETE COM 56585A102 1,146,153 61,417 5.66 105,137 50.69 0.1238
2013-10-30 2013-09-30 13F MARATHON PETE COM 56585A102 1,084,736 160,395 17.35 69,770 6.22 0.0875
2013-07-23 2013-06-30 13F MARATHON PETE COM 56585A102 924,341 924,341 65,684 0.0868
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.