Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionCountry Trust Bank
Latest Disclosed Ownership6,928 shares
Latest Disclosed Value $ 1,691,680
Country Trust Bank reports 50.49% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 10, 2026 - Country Trust Bank filed a 13F-HR form disclosing ownership of 6,928 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,691,680 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 13,994 shares of Marathon Petroleum Corporation. This represents a change in shares of -50.49% 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)
2026-04-10 2026-03-31 13F MARATHON PETE COM 56585A102 6,928 -7,066 -50.49 1,692 -25.67 0.0321
2026-01-21 2025-12-31 13F MARATHON PETE COM 56585A102 13,994 0 0.00 2,276 -15.65 0.0412
2025-10-28 2025-09-30 13F MARATHON PETE COM 56585A102 13,994 -233 -1.64 2,697 14.13 0.0590
2025-08-12 2025-06-30 13F MARATHON PETE COM 56585A102 14,227 14 0.10 2,363 14.15 0.0530
2025-05-14 2025-03-31 13F/A-1 MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 14,213 0 0.00 2,071 4.44 0.0522
2025-04-22 2025-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 14,213 0 1,983 0.0500
2025-01-23 2024-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 14,213 0 0.00 1,983 -14.38 0.0495
2024-10-08 2024-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 14,213 0 0.00 2,315 -6.09 0.0566
2024-07-12 2024-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 14,213 6,900 94.35 2,466 67.35 0.0623
2024-04-16 2024-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 7,313 0 0.00 1,474 35.89 0.0382
2024-01-08 2023-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 7,313 0 0.00 1,085 -1.99 0.0302
2023-10-10 2023-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 7,313 0 0.00 1,107 29.81 0.0324
2023-07-12 2023-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 7,313 247 3.50 853 -10.50 0.0231
2023-04-13 2023-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 7,066 -2,725 -27.83 953 -16.42 0.0271
2023-01-18 2022-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 9,791 -165 -1.66 1,140 0.0337
2022-10-20 2022-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 9,956 0 0.00 1 0.0310
2022-07-12 2022-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 9,956 0 0.00 1 0.0259
2022-04-25 2022-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 9,956 -232 -2.28 1 0.0238
2022-01-26 2021-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,188 32 0.32 1 0.0177
2021-10-26 2021-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 0 0.00 1 0.0184
2021-07-19 2021-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 0 0.00 1 0.0182
2021-04-16 2021-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 0 0.00 1 0.0173
2021-02-03 2020-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 0 0.00 0 0.0145
2020-10-15 2020-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 0 0.00 0 -100.00 0.0114
2020-07-27 2020-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 0 0.00 380 58.33 0.0153
2020-04-17 2020-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 0 0.00 240 -60.78 0.0108
2020-01-08 2019-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,156 -50 -0.49 612 -1.29 0.0241
2019-10-10 2019-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,206 -300 -2.86 620 5.62 0.0268
2019-07-11 2019-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,506 0 0.00 587 -6.68 0.0256
2019-04-17 2019-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,506 -24 -0.23 629 1.29 0.0280
2019-02-04 2018-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 10,530 -1,976 -15.80 621 -37.90 0.0309
2018-11-09 2018-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 12,506 0 0.00 1,000 14.03 0.0462
2018-08-10 2018-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 12,506 0 0.00 877 -4.05 0.0376
2018-05-08 2018-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 12,506 0 0.00 914 10.79 0.0435
2018-01-11 2017-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 12,506 12,506 825 0.0355
2017-01-31 2016-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 0 -1,200 -100.00 0 -100.00
2016-11-09 2016-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 1,200 -800 -40.00 49 -35.53 0.0025
2016-07-13 2016-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 2,000 0 0.00 76 2.70 0.0041
2016-04-18 2016-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 2,000 0 0.00 74 -28.85 0.0040
2016-01-12 2015-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 2,000 0 0.00 104 11.83 0.0057
2015-10-09 2015-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 2,000 0 0.00 93 -11.43 0.0051
2015-07-02 2015-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 2,000 1,000 100.00 105 2.94 0.0053
2015-04-03 2015-03-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 1,000 0 0.00 102 13.33 0.0051
2015-01-08 2014-12-31 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 1,000 0 0.00 90 7.14 0.0045
2014-10-03 2014-09-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 1,000 0 0.00 85 7.69 0.0043
2014-08-07 2014-06-30 13F MARATHON PETROLEUM CORP COMMON COMMON STOCK 56585A102 1,000 1,000 78 0.0039
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.