Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionFirst Interstate Bank
Latest Disclosed Ownership7,949 shares
Latest Disclosed Value $ 1,940,987
First Interstate Bank reports 26.23% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 29, 2026 - First Interstate Bank filed a 13F-HR form disclosing ownership of 7,949 shares of Marathon Petroleum Corporation (US:MPC) valued at $1,940,987 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 10,775 shares of Marathon Petroleum Corporation. This represents a change in shares of -26.23% during the quarter. The current value of the position is $2,124,052 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)
2026-04-29 2026-03-31 13F MARATHON PETE COM 56585A102 7,949 -2,826 -26.23 1,941 10.73 0.1038
2026-01-29 2025-12-31 13F MARATHON PETE COM 56585A102 10,775 -15,425 -58.87 1,752 -65.30 0.0940
2025-10-29 2025-09-30 13F MARATHON PETE COM 56585A102 26,200 26,200 5,050 0.2788
2024-10-29 2024-09-30 13F Marathon Petroleum COM 56585A102 0 -1,200 -100.00 0 -100.00
2024-08-07 2024-06-30 13F Marathon Petroleum COM 56585A102 1,200 -500 -29.41 208 -39.18 0.0138
2024-05-01 2024-03-31 13F Marathon Petroleum COM 56585A102 1,700 1,700 343 0.0237
2020-05-11 2020-03-31 13F Marathon Petroleum COM 56585A102 0 -570 -100.00 0 -100.00
2020-02-06 2019-12-31 13F Marathon Petroleum COM 56585A102 570 -19 -3.23 34 -2.86 0.0076
2019-10-30 2019-09-30 13F Marathon Petroleum COM 56585A102 589 -368 -38.45 35 -35.19 0.0081
2019-08-05 2019-06-30 13F Marathon Petroleum COM 56585A102 957 -499 -34.27 54 -37.93 0.0120
2019-05-02 2019-03-31 13F Marathon Petroleum COM 56585A102 1,456 -360 -19.82 87 -18.69 0.0194
2019-01-30 2018-12-31 13F Marathon Petroleum COM 56585A102 1,816 270 17.46 107 -13.71 0.0265
2018-11-07 2018-09-30 13F Marathon Petroleum COM 56585A102 1,546 -436 -22.00 124 -10.79 0.0261
2018-07-26 2018-06-30 13F Marathon Petroleum COM 56585A102 1,982 -300 -13.15 139 -16.77 0.0308
2018-04-25 2018-03-31 13F Marathon Petroleum COM 56585A102 2,282 -300 -11.62 167 -2.34 0.0377
2018-02-13 2017-12-31 13F Marathon Petroleum COM 56585A102 2,582 0 0.00 171 18.75 0.0363
2017-11-08 2017-09-30 13F Marathon Petroleum COM 56585A102 2,582 206 8.67 144 16.13 0.0310
2017-08-07 2017-06-30 13F Marathon Petroleum COM 56585A102 2,376 1,064 81.10 124 87.88 0.0257
2017-05-11 2017-03-31 13F Marathon Petroleum COM 56585A102 1,312 0 0.00 66 0.00 0.0136
2017-01-31 2016-12-31 13F Marathon Petroleum COM 56585A102 1,312 0 0.00 66 24.53 0.0130
2016-11-10 2016-09-30 13F Marathon Petroleum COM 56585A102 1,312 276 26.64 53 35.90 0.0109
2016-08-09 2016-06-30 13F Marathon Petroleum COM 56585A102 1,036 -1,108 -51.68 39 -51.25 0.0081
2016-05-11 2016-03-31 13F Marathon Petroleum COM 56585A102 2,144 -1,136 -34.63 80 -52.94 0.0168
2016-02-02 2015-12-31 13F Marathon Petroleum COM 56585A102 3,280 0 0.00 170 11.84 0.0353
2015-11-10 2015-09-30 13F Marathon Petroleum Common Stock 56585A102 3,280 3,280 152 0.0324
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.