Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionNational Asset Management, Inc.
Latest Disclosed Ownership953 shares
Latest Disclosed Value $ 233,581
National Asset Management, Inc. ownership in MPC / Marathon Petroleum Corporation

On April 24, 2026 - National Asset Management, Inc. filed a 13F-HR form disclosing ownership of 953 shares of Marathon Petroleum Corporation (MX:MPC) valued at $233,581 USD as of March 31, 2026. The entity filed a previous 13F-HR on October 31, 2025 disclosing 0 shares of Marathon Petroleum Corporation.

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)
2026-04-24 2026-03-31 13F MARATHON PETE COM 56585A102 953 953 234 0.0148
2025-10-31 2025-09-30 13F MARATHON PETE COM 56585A102 0 -2,608 -100.00 0 -100.00
2025-08-19 2025-06-30 13F MARATHON PETE COM 56585A102 2,608 -6,345 -70.87 433 -65.30 0.0203
2025-02-25 2024-12-31 13F MARATHON PETE COM 56585A102 8,953 -1,774 -16.54 1,249 -31.50 0.0409
2024-12-13 2024-09-30 13F MARATHON PETE COM 56585A102 10,727 -663 -5.82 1,823 -7.75 0.0507
2024-12-13 2024-09-30 13F MARATHON PETE COM 56585A102 10,727 1,823
2024-08-19 2024-06-30 13F MARATHON PETE COM 56585A102 11,390 -1,798 -13.63 1,976 -1.00 0.0503
2024-05-16 2024-03-31 13F MARATHON PETE COM 56585A102 13,188 588 4.67 1,996 6.74 0.0540
2024-03-15 2023-12-31 13F MARATHON PETE COM 56585A102 12,600 -588 -4.46 1,869 -6.32 0.0503
2023-12-01 2023-09-30 13F MARATHON PETE COM 56585A102 13,188 -1,633 -11.02 1,996 15.45 0.0540
2023-07-27 2023-06-30 13F MARATHON PETE COM 56585A102 14,821 -2,164 -12.74 1,728 -24.51 0.0388
2023-05-17 2023-03-31 13F MARATHON PETE COM 56585A102 16,985 -528 -3.01 2,290 12.32 0.0610
2023-03-15 2022-12-31 13F/A-1 MARATHON PETE COM 56585A102 17,513 240 1.39 2,038 18.70 0.0571
2023-02-21 2022-12-31 13F MARATHON PETE COM 56585A102 17,513 240 2,038 0.0513
2022-11-22 2022-09-30 13F/A-1 MARATHON PETE COM 56585A102 17,273 -3,170 -15.51 1,717 2.08 0.0519
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 17,273 -3,170 1,717 0.0249
2022-08-12 2022-06-30 13F MARATHON PETE COM 56585A102 20,443 -5,540 -21.32 1,682 -24.30 0.0708
2022-05-02 2022-03-31 13F MARATHON PETE COM 56585A102 25,983 2,174 9.13 2,222 45.80 0.0727
2022-01-28 2021-12-31 13F MARATHON PETE COM 56585A102 23,809 1,643 7.41 1,524 11.65 0.0439
2021-11-16 2021-09-30 13F MARATHON PETE COM 56585A102 22,166 4,402 24.78 1,365 31.00 0.0434
2021-08-10 2021-06-30 13F MARATHON PETE COM 56585A102 17,764 -52,063 -74.56 1,042 -71.78 0.0338
2021-05-13 2021-03-31 13F MARATHON PETE COM 56585A102 69,827 56,863 438.62 3,692 587.52 0.1306
2021-02-04 2020-12-31 13F MARATHON PETE COM 56585A102 12,964 -44,341 -77.38 537 -68.60 0.0287
2020-11-09 2020-09-30 13F MARATHON PETE COM 56585A102 57,305 -543 -0.94 1,710 -20.94 0.0912
2020-07-31 2020-06-30 13F MARATHON PETE COM 56585A102 57,848 -2,161 -3.60 2,163 52.43 0.1445
2020-05-06 2020-03-31 13F MARATHON PETE COM 56585A102 60,009 54,046 906.36 1,419 294.17 0.1211
2020-02-10 2019-12-31 13F MARATHON PETE COM 56585A102 5,963 -2,689 -31.08 360 -31.56 0.0306
2019-11-12 2019-09-30 13F MARATHON PETE COM 56585A102 8,652 3,847 80.06 526 94.81 0.0518
2019-08-05 2019-06-30 13F MARATHON PETE COM 56585A102 4,805 670 16.20 270 8.43 0.0296
2019-05-08 2019-03-31 13F MARATHON PETE COM 56585A102 4,135 4,135 249 0.0311
2018-11-08 2018-09-30 13F MARATHON PETE COM 56585A102 0 -4,344 -100.00 0 -100.00
2018-10-04 2018-06-30 13F MARATHON PETE COM 56585A102 4,344 1,377 46.41 306 40.37 0.0404
2018-05-15 2018-03-31 13F MARATHON PETE COM 56585A102 2,967 2,967 218 0.0305
2015-05-14 2015-03-31 13F MARATHON PETE COM 56585A102 0 -325 -100.00 0 -100.00
2015-02-18 2014-12-31 13F MARATHON PETE COM 56585A102 325 325 29 0.0006
2014-11-14 2014-09-30 13F Marathon Petroleum Specialty-Energy 56585A102 0 -262 -100.00 0 -100.00
2014-08-14 2014-06-30 13F Marathon Petroleum Specialty-Energy 56585A102 262 262 20 0.0048
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.