Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionHartland & Co., LLC
Latest Disclosed Ownership8,081 shares
Latest Disclosed Value $ 1,973,136
Hartland & Co., LLC reports 28.22% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 6, 2026 - Hartland & Co., LLC filed a 13F-HR form disclosing ownership of 8,081 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,973,136 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 11,258 shares of Marathon Petroleum Corporation. This represents a change in shares of -28.22% 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)
2026-05-06 2026-03-31 13F MARATHON PETE COM 56585A102 8,081 -3,177 -28.22 1,973 7.81 0.0180
2026-02-09 2025-12-31 13F MARATHON PETE COM 56585A102 11,258 -1,950 -14.76 1,831 -28.09 0.0231
2025-11-10 2025-09-30 13F MARATHON PETE COM 56585A102 13,208 2,619 24.73 2,546 44.77 0.0334
2025-08-08 2025-06-30 13F MARATHON PETE COM 56585A102 10,589 2,181 25.94 1,759 43.63 0.0247
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 8,408 225 2.75 1,225 7.27 0.0190
2025-02-10 2024-12-31 13F MARATHON PETE COM 56585A102 8,183 -2,568 -23.89 1,142 -34.84 0.0173
2024-11-13 2024-09-30 13F MARATHON PETE COM 56585A102 10,751 2,100 24.27 1,751 16.73 0.0272
2024-08-12 2024-06-30 13F MARATHON PETE COM 56585A102 8,651 4,855 127.90 1,501 122.22 0.0256
2024-05-14 2024-03-31 13F MARATHON PETE COM 56585A102 3,796 61 1.63 675 21.84 0.0334
2024-02-12 2023-12-31 13F MARATHON PETE COM 56585A102 3,735 187 5.27 554 3.36 0.0294
2023-11-13 2023-09-30 13F/A-1 MARATHON PETE COM 56585A102 3,548 -10 -0.28 537 29.47 0.0330
2023-11-07 2023-09-30 13F MARATHON PETE COM 56585A102 3,548 -10 537 0.0295
2023-08-07 2023-06-30 13F MARATHON PETE COM 56585A102 3,558 -532 -13.01 415 -24.86 0.0251
2023-05-09 2023-03-31 13F MARATHON PETE COM 56585A102 4,090 966 30.92 551 51.79 0.0401
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 3,124 9 0.29 364 17.48 0.0285
2022-11-15 2022-09-30 13F MARATHON PETE COM 56585A102 3,115 121 4.04 309 25.61 0.0285
2022-08-12 2022-06-30 13F MARATHON PETE COM 56585A102 2,994 40 1.35 246 -2.77 0.0192
2022-05-04 2022-03-31 13F MARATHON PETE COM 56585A102 2,954 0 0.00 253 33.86 0.0172
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 2,954 1,063 56.21 189 61.54 0.0129
2021-11-12 2021-09-30 13F MARATHON PETE COM 56585A102 1,891 -50 -2.58 117 0.00 0.0087
2021-08-12 2021-06-30 13F MARATHON PETE COM 56585A102 1,941 43 2.27 117 14.71 0.0090
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 1,898 7 0.37 102 30.77 0.0085
2021-02-11 2020-12-31 13F MARATHON PETE COM 56585A102 1,891 -250 -11.68 78 23.81 0.0071
2020-11-12 2020-09-30 13F MARATHON PETE COM 56585A102 2,141 947 79.31 63 40.00 0.0068
2020-08-11 2020-06-30 13F MARATHON PETE COM 56585A102 1,194 -1,426 -54.43 45 -27.42 0.0052
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 2,620 -4,164 -61.38 62 -84.84 0.0090
2020-02-11 2019-12-31 13F MARATHON PETE COM 56585A102 6,784 947 16.22 409 15.21 0.0496
2019-11-12 2019-09-30 13F MARATHON PETE COM 56585A102 5,837 -1,531 -20.78 355 -13.83 0.0475
2019-08-08 2019-06-30 13F MARATHON PETE COM 56585A102 7,368 3,564 93.69 412 80.70 0.0549
2019-05-14 2019-03-31 13F MARATHON PETE COM 56585A102 3,804 3,804 228 0.0314
2019-02-08 2018-12-31 13F MARATHON PETE COM 56585A102 0 -3,765 -100.00 0 -100.00
2018-11-13 2018-09-30 13F MARATHON PETE COM 56585A102 3,765 3,765 301 0.0413
2017-11-09 2017-09-30 13F MARATHON PETE COM 56585A102 0 -4,131 -100.00 0 -100.00
2017-08-03 2017-06-30 13F MARATHON PETE COM 56585A102 4,131 148 3.72 216 7.46 0.0316
2017-05-11 2017-03-31 13F MARATHON PETE COM 56585A102 3,983 -400 -9.13 201 -8.64 0.0292
2017-02-10 2016-12-31 13F MARATHON PETE COM 56585A102 4,383 4,383 220 0.0356
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.