Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionKoshinski Asset Management, Inc.
Latest Disclosed Ownership8,471 shares
Latest Disclosed Value $ 2,068,542
Koshinski Asset Management, Inc. reports 4.37% increase in ownership of MPC / Marathon Petroleum Corporation

On April 27, 2026 - Koshinski Asset Management, Inc. filed a 13F-HR form disclosing ownership of 8,471 shares of Marathon Petroleum Corporation (MX:MPC) valued at $2,068,542 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 8,116 shares of Marathon Petroleum Corporation. This represents a change in shares of 4.37% 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)
2026-04-27 2026-03-31 13F MARATHON PETE COM 56585A102 8,471 355 4.37 2,069 56.79 0.1290
2026-02-03 2025-12-31 13F MARATHON PETE COM 56585A102 8,116 59 0.73 1,320 -15.07 0.0850
2025-11-10 2025-09-30 13F MARATHON PETE COM 56585A102 8,057 90 1.13 1,553 17.38 0.1044
2025-07-29 2025-06-30 13F MARATHON PETE COM 56585A102 7,967 264 3.43 1,323 17.91 0.0999
2025-04-25 2025-03-31 13F MARATHON PETE COM 56585A102 7,703 -289 -3.62 1,122 0.72 0.0953
2025-01-16 2024-12-31 13F MARATHON PETE COM 56585A102 7,992 -28 -0.35 1,115 -14.70 0.0954
2024-10-10 2024-09-30 13F MARATHON PETE COM 56585A102 8,020 619 8.36 1,306 8.38 0.1130
2024-07-12 2024-06-30 13F MARATHON PETE COM 56585A102 7,401 -749 -9.19 1,206 -26.61 0.1118
2024-05-08 2024-03-31 13F MARATHON PETE COM 56585A102 8,150 189 2.37 1,642 39.03 0.1681
2024-01-29 2023-12-31 13F MARATHON PETE COM 56585A102 7,961 618 8.42 1,181 6.30 0.1793
2023-10-18 2023-09-30 13F MARATHON PETE COM 56585A102 7,343 234 3.29 1,111 34.18 0.1277
2023-07-28 2023-06-30 13F MARATHON PETE COM 56585A102 7,109 -3,119 -30.49 829 -39.91 0.0888
2023-04-12 2023-03-31 13F MARATHON PETE COM 56585A102 10,228 851 9.08 1,379 26.31 0.1347
2023-01-24 2022-12-31 13F MARATHON PETE COM 56585A102 9,377 -220 -2.29 1,091 0.1056
2022-10-20 2022-09-30 13F/A-1 MARATHON PETE COM 56585A102 9,597 -4,242 -30.65 1 -100.00 0.1138
2022-07-12 2022-06-30 13F MARATHON PETE COM 56585A102 13,839 1,268 10.09 1 -99.91 0.1131
2022-04-20 2022-03-31 13F MARATHON PETE COM 56585A102 12,571 578 4.82 1,075 40.03 0.0882
2022-01-14 2021-12-31 13F MARATHON PETE COM 56585A102 11,993 458 3.97 767 7.72 0.0620
2021-10-12 2021-09-30 13F MARATHON PETE COM 56585A102 11,535 3,239 39.04 713 42.12 0.0620
2021-07-26 2021-06-30 13F MARATHON PETE COM 56585A102 8,296 -2,687 -24.47 501 -14.65 0.0630
2021-05-06 2021-03-31 13F MARATHON PETE COM 56585A102 10,983 1,983 22.03 587 57.80 0.0622
2021-03-30 2020-12-31 13F/A-2 MARATHON PETE COM 56585A102 9,000 4 0.04 372 35.77 0.0471
2021-02-05 2020-12-31 13F/A-1 MARATHON PETE COM 56585A102 5,997 -3,003 372 0.0471
2020-11-16 2020-09-30 13F MARATHON PETE COM 56585A102 8,996 3,179 54.65 274 26.27 0.0368
2020-07-29 2020-06-30 13F MARATHON PETE COM 56585A102 5,817 5,817 217 0.0352
2020-04-30 2020-03-31 13F MARATHON PETE COM 56585A102 0 -4,354 -100.00 0 -100.00
2020-01-29 2019-12-31 13F MARATHON PETE COM 56585A102 4,354 4,354 260 0.0448
2019-10-30 2019-09-30 13F MARATHON PETE COM 56585A102 0 -3,619 -100.00 0 -100.00
2019-07-18 2019-06-30 13F MARATHON PETE COM 56585A102 3,619 -561 -13.42 202 -19.20 0.0822
2019-05-14 2019-03-31 13F MARATHON PETE COM 56585A102 4,180 -195 -4.46 250 -3.10 0.0670
2019-02-08 2018-12-31 13F MARATHON PETE COM 56585A102 4,375 1,318 43.11 258 5.74 0.0634
2018-11-15 2018-09-30 13F MARATHON PETE COM 56585A102 3,057 -768 -20.08 244 -8.96 0.0347
2018-08-13 2018-06-30 13F/A-1 MARATHON PETE COM 56585A102 3,825 -443 -10.38 268 -14.10 0.0818
2018-08-10 2018-06-30 13F MARATHON PETE COM 56585A102 3,825 -443 3,186
2018-04-09 2018-03-31 13F MARATHON PETE COM 56585A102 4,268 -269 -5.93 312 4.35 0.0969
2018-01-17 2017-12-31 13F MARATHON PETE COM 56585A102 4,537 4,537 299 0.0748
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.