Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionFounders Capital Management
Latest Disclosed Ownership80 shares
Latest Disclosed Value $ 19,534
Founders Capital Management reports 46.67% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 21, 2026 - Founders Capital Management filed a 13F-HR form disclosing ownership of 80 shares of Marathon Petroleum Corporation (US:MPC) valued at $19,534 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 15, 2026 disclosing 150 shares of Marathon Petroleum Corporation. This represents a change in shares of -46.67% during the quarter. The current value of the position is $21,377 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)
2026-04-21 2026-03-31 13F MARATHON PETE COM 56585A102 80 -70 -46.67 20 -20.83 0.0095
2026-01-15 2025-12-31 13F MARATHON PETE COM 56585A102 150 0 0.00 24 -14.29 0.0127
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 150 0 0.00 29 16.67 0.0153
2025-07-18 2025-06-30 13F MARATHON PETE COM 56585A102 150 0 0.00 25 14.29 0.0149
2025-04-08 2025-03-31 13F MARATHON PETE COM 56585A102 150 -150 -50.00 22 -48.78 0.0141
2025-01-13 2024-12-31 13F MARATHON PETE COM 56585A102 300 0 0.00 42 -14.58 0.0265
2024-10-07 2024-09-30 13F MARATHON PETE COM 56585A102 300 0 0.00 49 -7.69 0.0298
2024-07-10 2024-06-30 13F MARATHON PETE COM 56585A102 300 -100 -25.00 52 -35.00 0.0337
2024-04-10 2024-03-31 13F MARATHON PETE COM 56585A102 400 0 0.00 81 35.59 0.0545
2024-01-08 2023-12-31 13F MARATHON PETE COM 56585A102 400 0 0.00 59 -1.67 0.0431
2023-10-10 2023-09-30 13F MARATHON PETE COM 56585A102 400 0 0.00 61 30.43 0.0462
2023-07-07 2023-06-30 13F MARATHON PETE COM 56585A102 400 0 0.00 47 0.0339
2023-04-12 2023-03-31 13F MARATHON PETE COM 56585A102 400 0 0.00 0 0.0413
2023-01-09 2022-12-31 13F MARATHON PETE COM 56585A102 400 0 0.00 0 -100.00 0.0353
2022-10-06 2022-09-30 13F MARATHON PETE COM 56585A102 400 0 0.00 40 21.21 0.0326
2022-07-20 2022-06-30 13F MARATHON PETE COM 56585A102 400 0 0.00 33 26.92 0.0260
2022-04-07 2022-03-31 13F MARATHON PETE COM 56585A102 400 0 0.00 26 0.00 0.0167
2022-01-21 2021-12-31 13F MARATHON PETE COM 56585A102 400 0 0.00 26 4.00 0.0167
2021-10-12 2021-09-30 13F MARATHON PETE COM 56585A102 400 0 0.00 25 4.17 0.0171
2021-07-15 2021-06-30 13F MARATHON PETE COM 56585A102 400 0 0.00 24 14.29 0.0156
2021-06-09 2021-03-31 13F/A-1 MARATHON PETE COM 56585A102 400 0 0.00 21 23.53 0.0149
2021-06-07 2021-03-31 13F MARATHON PETE COM 56585A102 400 0 6 0.0658
2021-01-12 2020-12-31 13F MARATHON PETE COM 56585A102 400 -315 -44.06 17 0.00 0.0120
2020-04-22 2020-03-31 13F MARATHON PETE COM 56585A102 715 -394 -35.53 17 -74.63 0.0176
2020-01-24 2019-12-31 13F MARATHON PETE COM 56585A102 1,109 -247 -18.22 67 -18.29 0.0507
2019-10-10 2019-09-30 13F MARATHON PETE COM 56585A102 1,356 3 0.22 82 7.89 0.0656
2019-07-11 2019-06-30 13F MARATHON PETE COM 56585A102 1,353 3 0.22 76 -6.17 0.0670
2019-04-17 2019-03-31 13F MARATHON PETE COM 56585A102 1,350 300 28.57 81 30.65 0.0759
2019-01-14 2018-12-31 13F MARATHON PETE COM 56585A102 1,050 0 0.00 62 -26.19 0.0662
2018-10-05 2018-09-30 13F MARATHON PETE COM 56585A102 1,050 0 0.00 84 13.51 0.0693
2018-07-09 2018-06-30 13F MARATHON PETE COM 56585A102 1,050 0 0.00 74 -3.90 0.0650
2018-04-09 2018-03-31 13F MARATHON PETE COM 56585A102 1,050 0 0.00 77 11.59 0.0648
2018-01-22 2017-12-31 13F MARATHON PETE COM 56585A102 1,050 0 0.00 69 16.95 0.0572
2017-10-17 2017-09-30 13F MARATHON PETE COM 56585A102 1,050 0 0.00 59 7.27 0.0489
2017-07-19 2017-06-30 13F MARATHON PETE COM 56585A102 1,050 0 0.00 55 3.77 0.0487
2017-05-09 2017-03-31 13F MARATHON PETE COM 56585A102 1,050 1,050 53 0.0476
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.