Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionSimmons Bank
Latest Disclosed Ownership5,101 shares
Latest Disclosed Value $ 1,245,563
Simmons Bank ownership in MPC / Marathon Petroleum Corporation

On April 23, 2026 - Simmons Bank filed a 13F-HR form disclosing ownership of 5,101 shares of Marathon Petroleum Corporation (US:MPC) valued at $1,245,562 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 5,101 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $1,363,038 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)
2026-04-23 2026-03-31 13F MARATHON PETE COMMON STOCK 56585A102 5,101 0 0.00 1,246 50.18 0.0834
2026-02-05 2025-12-31 13F MARATHON PETE COMMON STOCK 56585A102 5,101 -4 -0.08 830 -15.67 0.0555
2025-11-04 2025-09-30 13F MARATHON PETE COMMON STOCK 56585A102 5,105 65 1.29 984 17.44 0.0656
2025-08-06 2025-06-30 13F MARATHON PETE COMMON STOCK 56585A102 5,040 0 0.00 837 14.03 0.0597
2025-04-29 2025-03-31 13F MARATHON PETE COMMON STOCK 56585A102 5,040 0 0.00 734 4.41 0.0554
2025-02-05 2024-12-31 13F MARATHON PETE COMMON STOCK 56585A102 5,040 0 0.00 703 -14.37 0.0514
2024-11-05 2024-09-30 13F MARATHON PETE COMMON STOCK 56585A102 5,040 -205 -3.91 821 -9.68 0.0594
2024-07-26 2024-06-30 13F MARATHON PETE COMMON STOCK 56585A102 5,245 -249 -4.53 910 -17.89 0.0687
2024-05-14 2024-03-31 13F MARATHON PETE COMMON STOCK 56585A102 5,494 0 0.00 1,107 35.83 0.0832
2024-02-06 2023-12-31 13F MARATHON PETE COMMON STOCK 56585A102 5,494 205 3.88 815 1.88 0.0666
2023-10-26 2023-09-30 13F MARATHON PETE COMMON STOCK 56585A102 5,289 106 2.05 800 32.45 0.0710
2023-08-03 2023-06-30 13F MARATHON PETE COMMON STOCK 56585A102 5,183 151 3.00 604 -10.91 0.0508
2023-04-28 2023-03-31 13F MARATHON PETE COMMON STOCK 56585A102 5,032 1,422 39.39 678 61.43 0.0579
2023-02-08 2022-12-31 13F MARATHON PETE COMMON STOCK 56585A102 3,610 13 0.36 420 17.65 0.0361
2022-10-27 2022-09-30 13F MARATHON PETE COMMON STOCK 56585A102 3,597 0 0.00 357 20.61 0.0333
2022-07-29 2022-06-30 13F MARATHON PETE COMMON STOCK 56585A102 3,597 -28 -0.77 296 -4.52 0.0259
2022-04-21 2022-03-31 13F MARATHON PETROLEUM COMMON STOCK 56585A102 3,625 -254 -6.55 310 25.00 0.0232
2022-01-28 2021-12-31 13F MARATHON PETROLEUM COMMON STOCK 56585A102 3,879 -548 -12.38 248 -9.49 0.0174
2021-10-26 2021-09-30 13F MARATHON PETROLEUM COMMON STOCK 56585A102 4,427 -153 -3.34 274 -1.08 0.0199
2021-08-05 2021-06-30 13F MARATHON PETROLEUM COMMON STOCK 56585A102 4,580 -22,997 -83.39 277 -81.22 0.0200
2021-05-06 2021-03-31 13F MARATHON PETROLEUM COMMON STOCK 56585A102 27,577 -15,833 -36.47 1,475 -17.83 0.1113
2021-02-08 2020-12-31 13F MARATHON PETROLEUM COMMON STOCK 56585A102 43,410 -8,299 -16.05 1,795 18.33 0.1425
2020-11-13 2020-09-30 13F MARATHON PETE COMMON STOCK 56585A102 51,709 -5,552 -9.70 1,517 -29.15 0.1245
2020-08-14 2020-06-30 13F MARATHON PETE COMMON STOCK 56585A102 57,261 -3,582 -5.89 2,141 48.99 0.1767
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 60,843 56,273 1,231.36 1,437 422.55 0.1250
2020-01-31 2019-12-31 13F MARATHON PETROLEUM COMMON STOCK 56585A102 4,570 0 0.00 275 -0.72 0.0247
2019-11-13 2019-09-30 13F MARATHON PETROLEUM COMMON STOCK 56585A102 4,570 -458 -9.11 277 -1.42 0.0273
2019-08-13 2019-06-30 13F MARATHON PETROLEUM COMMON STOCK 56585A102 5,028 164 3.37 281 -3.44 0.0272
2019-05-13 2019-03-31 13F MARATHON PETROLEUM COMMON STOCK 56585A102 4,864 183 3.91 291 5.05 0.0283
2019-01-24 2018-12-31 13F MARATHON PETROLEUM COMMON STOCK 56585A102 4,681 4,681 277 0.0310
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.