Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionField & Main Bank
Latest Disclosed Ownership2,345 shares
Latest Disclosed Value $ 572,602
Field & Main Bank reports 1.88% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 10, 2026 - Field & Main Bank filed a 13F-HR form disclosing ownership of 2,345 shares of Marathon Petroleum Corporation (US:MPC) valued at $572,602 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 2,390 shares of Marathon Petroleum Corporation. This represents a change in shares of -1.88% during the quarter. The current value of the position is $626,607 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)
2026-04-10 2026-03-31 13F Marathon Pete Com 56585A102 2,345 -45 -1.88 573 47.42 0.0963
2026-01-28 2025-12-31 13F Marathon Pete Com 56585A102 2,390 -25 -1.04 389 -16.56 0.1120
2025-11-03 2025-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,415 -90 -3.59 465 11.78 0.1375
2025-08-04 2025-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,505 -5 -0.20 416 13.97 0.1354
2025-04-23 2025-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,510 -5 -0.20 366 4.29 0.1291
2025-01-23 2024-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,515 -30 -1.18 351 -15.46 0.1234
2024-11-01 2024-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,545 -25 -0.97 415 -6.97 0.1477
2024-07-25 2024-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,570 -40 -1.53 446 -15.24 0.1670
2024-04-29 2024-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,610 -80 -2.97 526 31.58 0.2043
2024-02-05 2023-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,690 150 5.91 399 3.91 0.1688
2023-10-12 2023-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,540 0 0.00 384 29.73 0.1800
2023-07-26 2023-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,540 -10 -0.39 296 -13.70 0.1650
2023-04-19 2023-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,550 -35 -1.35 344 14.33 0.2051
2023-01-19 2022-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,585 -195 -7.01 301 8.70 0.1940
2022-10-25 2022-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,780 -25 -0.89 276 20.00 0.1853
2022-07-18 2022-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 2,805 1,300 86.38 230 78.29 0.1480
2022-04-21 2022-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 1,505 -20 -1.31 129 32.99 0.0781
2022-02-01 2021-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 1,525 0 0.00 97 3.19 0.0559
2021-10-14 2021-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 1,525 -335 -18.01 94 -16.07 0.0618
2021-07-15 2021-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 1,860 200 12.05 112 27.27 0.0717
2021-04-30 2021-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 1,660 -190 -10.27 88 15.79 0.0631
2021-02-25 2020-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 1,850 -2,100 -53.16 76 -34.48 0.0566
2020-10-22 2020-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 3,950 -680 -14.69 116 -32.95 0.0896
2020-08-12 2020-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,630 -1,940 -29.53 173 -56.31 0.1474
2020-02-05 2019-12-31 13F/A-1 MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 6,570 425 6.92 396 6.17 0.3290
2020-02-03 2019-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 6,570 425 396 241,210.4378
2019-11-07 2019-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 6,145 -60 -0.97 373 7.49 0.3364
2019-07-22 2019-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 6,205 415 7.17 347 0.29 0.3185
2019-04-24 2019-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 5,790 905 18.53 346 -11.51 0.3264
2018-10-23 2018-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,885 -165 -3.27 391 -4.17 0.3492
2018-08-13 2018-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 5,050 465 10.14 408 21.79 0.3716
2018-05-01 2018-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,585 100 2.23 335 13.18 0.3268
2018-01-24 2017-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,485 -6,165 -57.89 296 -46.86 0.2840
2015-07-22 2015-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 10,650 5,375 101.90 557 3.15 0.5291
2015-04-30 2015-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 5,275 5,275 0.00 540 0.4995
2015-02-03 2014-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 0 -4,700 -100.00 0 -100.00
2014-10-14 2014-09-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,700 0 0.00 398 8.45 0.3745
2014-08-11 2014-06-30 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,700 -75 -1.57 367 -11.57 0.3429
2014-04-17 2014-03-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,775 -50 -1.04 415 -6.32 0.4009
2014-02-13 2013-12-31 13F MARATHON PETE COMMON STOCK - LARGE CAP 56585A102 4,825 4,825 443 0.4315
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.