Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionWASHINGTON TRUST Co
Latest Disclosed Ownership2,173 shares
Latest Disclosed Value $ 530,603
WASHINGTON TRUST Co ownership in MPC / Marathon Petroleum Corporation

On April 6, 2026 - WASHINGTON TRUST Co filed a 13F-HR form disclosing ownership of 2,173 shares of Marathon Petroleum Corporation (US:MPC) valued at $530,603 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 2,173 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $580,647 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)
2026-04-06 2026-03-31 13F MARATHON PETROLEUM CORP COM Equities 56585A102 2,173 0 0.00 531 50.14 0.0173
2026-02-10 2025-12-31 13F MARATHON PETROLEUM CORP COM Equities 56585A102 2,173 -27 -1.23 353 -16.75 0.0116
2025-11-12 2025-09-30 13F MARATHON PETROLEUM CORP COM Equities 56585A102 2,200 65 3.04 424 19.77 0.0139
2025-08-08 2025-06-30 13F MARATHON PETROLEUM CORP COM Equities 56585A102 2,135 0 0.00 355 13.83 0.0125
2025-04-25 2025-03-31 13F MARATHON PETE COM 56585A102 2,135 -90 -4.04 311 0.32 0.0119
2025-01-30 2024-12-31 13F Marathon Petroleum COM 56585A102 2,225 -250 -10.10 310 -23.08 0.0111
2024-10-25 2024-09-30 13F Marathon Petroleum COM 56585A102 2,475 0 0.00 403 -6.06 0.0141
2024-07-15 2024-06-30 13F Marathon Petroleum COM 56585A102 2,475 50 2.06 429 -12.09 0.0157
2024-04-23 2024-03-31 13F Marathon Petroleum COM 56585A102 2,425 0 0.00 489 35.93 0.0180
2024-01-18 2023-12-31 13F Marathon Petroleum COM 56585A102 2,425 -50 -2.02 360 -4.01 0.0142
2023-10-18 2023-09-30 13F Marathon Petroleum COM 56585A102 2,475 -25 -1.00 375 28.52 0.0165
2023-07-27 2023-06-30 13F Marathon Petroleum COM 56585A102 2,500 -470 -15.82 292 -27.25 0.0123
2023-05-10 2023-03-31 13F/A-1 Marathon Petroleum COM 56585A102 2,970 0 0.00 400 15.94 0.0180
2023-05-04 2023-03-31 13F Marathon Petroleum COM 56585A102 3 -2,967 0 0.0169
2023-07-27 2022-12-31 13F/A-1 Marathon Petroleum COM 56585A102 2,970 0 0.00 346 16.95 0.0161
2023-02-08 2022-12-31 13F Marathon Petroleum COM 56585A102 2,970 0 0 0.0000
2022-10-14 2022-09-30 13F Marathon Petroleum COM 56585A102 2,970 0 0.00 295 20.90 0.0149
2022-07-25 2022-06-30 13F Marathon Petroleum COM 56585A102 2,970 0 0.00 244 -3.94 0.0115
2022-05-05 2022-03-31 13F Marathon Petroleum COM 56585A102 2,970 450 17.86 254 57.76 0.0100
2022-02-09 2021-12-31 13F/A-1 Marathon Petroleum COM 56585A102 2,520 0 0.00 161 3.21 0.0060
2022-02-09 2021-12-31 13F Marathon Petroleum COM 56585A102 2,520 0 161 0.0056
2021-11-09 2021-09-30 13F Marathon Petroleum COM 56585A102 2,520 85 3.49 156 6.12 0.0044
2021-08-05 2021-06-30 13F Marathon Petroleum COM 56585A102 2,435 -4 -0.16 147 13.08 0.0041
2021-04-28 2021-03-31 13F Marathon Petroleum COM 56585A102 2,439 -1 -0.04 130 28.71 0.0040
2021-02-09 2020-12-31 13F Marathon Petroleum COM 56585A102 2,440 -320 -11.59 101 24.69 0.0033
2020-11-05 2020-09-30 13F Marathon Petroleum COM 56585A102 2,760 -640 -18.82 81 -33.06 0.0030
2020-08-04 2020-06-30 13F Marathon Petroleum COM 56585A102 3,400 652 23.73 121 86.15 0.0050
2020-05-07 2020-03-31 13F Marathon Petroleum COM UNIT REP LTD 56585A102 2,748 2,748 65 0.0031
2019-11-06 2019-09-30 13F Marathon Petroleum COM 56585A102 0 -3,713 -100.00 0 -100.00
2019-08-07 2019-06-30 13F Marathon Petroleum COM 56585A102 3,713 3,713 208 0.0114
2018-11-13 2018-09-30 13F Marathon Petroleum COM 56585A102 0 -3,355 -100.00 0 -100.00
2018-08-10 2018-06-30 13F Marathon Petroleum COM 56585A102 3,355 10 0.30 235 -4.08 0.0126
2018-05-10 2018-03-31 13F MARATHON PETE COMMON STOCK 56585A102 3,345 0 0.00 245 10.86 0.0144
2018-02-05 2017-12-31 13F MARATHON PETE COMMON STOCK 56585A102 3,345 3,345 221 0.0124
2016-05-05 2016-03-31 13F MARATHON PETE COMMON STOCK 56585A102 0 -4,082 -100.00 0 -100.00
2016-02-12 2015-12-31 13F MARATHON PETE COMMON STOCK 56585A102 4,082 -296 -6.76 212 4.43 0.0145
2015-11-12 2015-09-30 13F MARATHON PETE COMMON STOCK 56585A102 4,378 540 14.07 203 1.00 0.0147
2015-08-07 2015-06-30 13F MARATHON PETE COMMON STOCK 56585A102 3,838 3,838 201 0.0132
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.