Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionNorth Star Investment Management Corp.
Latest Disclosed Ownership5,726 shares
Latest Disclosed Value $ 1,398,186
North Star Investment Management Corp. reports 0.17% increase in ownership of MPC / Marathon Petroleum Corporation

On April 23, 2026 - North Star Investment Management Corp. filed a 13F-HR form disclosing ownership of 5,726 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,398,186 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 5,716 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.17% 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.

Upgrade to unlock premium data and export to Excel .

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 CORP COM Stock 56585A102 5,726 10 0.17 1,398 50.48 0.0847
2026-01-30 2025-12-31 13F MARATHON PETE CORP COM Stock 56585A102 5,716 1 0.02 930 -15.62 0.0583
2025-10-22 2025-09-30 13F MARATHON PETE CORP COM Stock 56585A102 5,715 1 0.02 1,101 16.02 0.0708
2025-07-15 2025-06-30 13F MARATHON PETE CORP COM Stock 56585A102 5,714 -38 -0.66 949 13.25 0.0661
2025-04-17 2025-03-31 13F MARATHON PETE CORP COM Stock 56585A102 5,752 1 0.02 838 4.49 0.0610
2025-02-10 2024-12-31 13F MARATHON PETE CORP COM Stock 56585A102 5,751 2 0.03 802 -14.32 0.0559
2024-10-30 2024-09-30 13F MARATHON PETE CORP COM Stock 56585A102 5,749 41 0.72 937 -5.45 0.0647
2024-08-06 2024-06-30 13F MARATHON PETE CORP COM Stock 56585A102 5,708 1 0.02 990 -13.84 0.0726
2024-04-30 2024-03-31 13F MARATHON PETE COM 56585A102 5,707 1 0.02 1,150 35.82 0.0820
2024-01-10 2023-12-31 13F MARATHON PETE CORP COM Stock 56585A102 5,706 2 0.04 846 -1.97 0.0651
2023-11-06 2023-09-30 13F MARATHON PETE CORP COM Stock 56585A102 5,704 1 0.02 863 29.77 0.0729
2023-08-02 2023-06-30 13F MARATHON PETE CORP COM Stock 56585A102 5,703 1 0.02 665 -13.41 0.0539
2023-04-27 2023-03-31 13F MARATHON PETE CORP COM Stock 56585A102 5,702 5,676 21,830.77 769 25,500.00 0.0634
2023-01-11 2022-12-31 13F MARATHON PETE CORP COM Stock 56585A102 26 26 3 0.0003
2020-07-15 2020-06-30 13F MARATHON PETE CORP COM Stock 56585A102 0 -550 -100.00 0 -100.00
2020-04-23 2020-03-31 13F MARATHON PETE CORP COM Stock 56585A102 550 -2,600 -82.54 13 -93.16 0.0019
2020-01-29 2019-12-31 13F MARATHON PETE CORP COM Stock 56585A102 3,150 0 0.00 190 -0.52 0.0198
2019-10-03 2019-09-30 13F MARATHON PETE CORP COM Stock 56585A102 3,150 3,150 191 0.0212
2019-07-15 2019-06-30 13F MARATHON PETE CORP COM Stock 56585A102 0 -1,150 -100.00 0 -100.00
2019-04-10 2019-03-31 13F MARATHON PETE CORP COM Stock 56585A102 1,150 1,150 69 0.0081
2019-01-07 2018-12-31 13F MARATHON PETE CORP COM Stock 56585A102 0 -570 -100.00 0 -100.00
2018-10-11 2018-09-30 13F MARATHON PETE CORP COM Stock 56585A102 570 0 0.00 46 15.00 0.0051
2018-07-20 2018-06-30 13F MARATHON PETE CORP COM Stock 56585A102 570 0 0.00 40 -4.76 0.0046
2018-04-13 2018-03-31 13F MARATHON PETE CORP COM Stock 56585A102 570 570 42 0.0050
2016-07-12 2016-06-30 13F MARATHON PETE CORP COM Stock 56585A102 0 -1,320 -100.00 0 -100.00
2016-04-25 2016-03-31 13F MARATHON PETE CORP COM Stock 56585A102 1,320 0 0.00 49 -27.94 0.0094
2016-01-20 2015-12-31 13F MARATHON PETE CORP COM Stock 56585A102 1,320 0 0.00 68 11.48 0.0132
2015-10-14 2015-09-30 13F MARATHON PETE Stock 56585A102 1,320 1,320 61 0.0125
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.