Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionArgent Trust Co
Latest Disclosed Ownership7,929 shares
Latest Disclosed Value $ 1,936,101
Argent Trust Co reports 13.19% increase in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - Argent Trust Co filed a 13F-HR form disclosing ownership of 7,929 shares of Marathon Petroleum Corporation (US:MPC) valued at $1,936,103 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 7,005 shares of Marathon Petroleum Corporation. This represents a change in shares of 13.19% during the quarter. The current value of the position is $2,118,708 USD.

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 COMMON STOCK 56585A102 7,929 924 13.19 1,936 69.97 0.0256
2026-02-10 2025-12-31 13F MARATHON PETE COMMON STOCK 56585A102 7,005 2,186 45.36 1,139 22.74 0.0391
2025-11-12 2025-09-30 13F MARATHON PETE COMMON STOCK 56585A102 4,819 -52 -1.07 929 14.71 0.0329
2025-08-12 2025-06-30 13F MARATHON PETE COMMON STOCK 56585A102 4,871 -524 -9.71 809 2.93 0.0305
2025-05-09 2025-03-31 13F MARATHON PETE COMMON STOCK 56585A102 5,395 -13,024 -70.71 786 -69.40 0.0323
2025-02-13 2024-12-31 13F MARATHON PETE COMMON STOCK 56585A102 18,419 265 1.46 2,569 -13.12 0.1048
2024-11-13 2024-09-30 13F MARATHON PETE COMMON STOCK 56585A102 18,154 647 3.70 2,957 -2.63 0.1224
2024-08-12 2024-06-30 13F MARATHON PETE COMMON STOCK 56585A102 17,507 -96 -0.55 3,037 -14.38 0.1337
2024-05-10 2024-03-31 13F MARATHON PETE COMMON STOCK 56585A102 17,603 370 2.15 3,547 38.77 0.1596
2024-02-09 2023-12-31 13F MARATHON PETE COMMON STOCK 56585A102 17,233 2,078 13.71 2,557 11.47 0.1272
2023-11-08 2023-09-30 13F MARATHON PETE COMMON STOCK 56585A102 15,155 1,164 8.32 2,294 40.59 0.1257
2023-08-11 2023-06-30 13F MARATHON PETE COMMON STOCK 56585A102 13,991 571 4.25 1,631 -9.84 0.0884
2023-05-12 2023-03-31 13F MARATHON PETE COMMON STOCK 56585A102 13,420 171 1.29 1,809 17.32 0.1146
2023-02-10 2022-12-31 13F MARATHON PETE COMMON STOCK 56585A102 13,249 1,429 12.09 1,542 31.46 0.1020
2022-11-10 2022-09-30 13F MARATHON PETE COMMON STOCK 56585A102 11,820 3,883 48.92 1,173 79.91 0.0849
2022-08-11 2022-06-30 13F MARATHON PETE COMMON STOCK 56585A102 7,937 2,459 44.89 652 39.32 0.0447
2022-05-11 2022-03-31 13F MARATHON PETE COMMON STOCK 56585A102 5,478 1,253 29.66 468 73.33 0.0285
2022-02-09 2021-12-31 13F MARATHON PETE COMMON STOCK 56585A102 4,225 680 19.18 270 23.29 0.0158
2021-11-09 2021-09-30 13F MARATHON PETE COMMON STOCK 56585A102 3,545 3,545 219 0.0141
2020-05-11 2020-03-31 13F MARATHON PETE COMMON STOCK 56585A102 0 -7,780 -100.00 0 -100.00
2020-02-11 2019-12-31 13F MARATHON PETE COMMON STOCK 56585A102 7,780 -739 -8.67 469 -9.28 0.0417
2019-11-12 2019-09-30 13F MARATHON PETE COMMON STOCK 56585A102 8,519 -7,060 -45.32 517 -40.57 0.0498
2019-08-13 2019-06-30 13F MARATHON PETE COMMON STOCK 56585A102 15,579 -420 -2.63 870 -9.19 0.0882
2019-05-15 2019-03-31 13F MARATHON PETE COMMON STOCK 56585A102 15,999 1,742 12.22 958 13.91 0.1003
2019-02-06 2018-12-31 13F MARATHON PETE COMMON STOCK 56585A102 14,257 9,449 196.53 841 123.67 0.0987
2018-11-14 2018-09-30 13F MARATHON PETE COM 56585A102 4,808 -799 -14.25 376 -3.84 0.0434
2019-04-15 2018-06-30 13F/A-1 MARATHON PETE COM 56585A102 5,607 1,811 47.71 391 41.16 0.0477
2018-08-15 2018-06-30 13F MARATHON PETE COM 56585A102 3,766 -30 264
2018-05-15 2018-03-31 13F MARATHON PETE COMMON STOCK 56585A102 3,796 3,796 277 0.0794
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.