Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionWinch Advisory Services, LLC
Latest Disclosed Ownership554 shares
Latest Disclosed Value $ 135,375
Winch Advisory Services, LLC reports 0.18% increase in ownership of MPC / Marathon Petroleum Corporation

On April 30, 2026 - Winch Advisory Services, LLC filed a 13F-HR form disclosing ownership of 554 shares of Marathon Petroleum Corporation (US:MPC) valued at $135,276 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 553 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.18% during the quarter. The current value of the position is $148,034 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)
2026-04-30 2026-03-31 13F MARATHON PETROLEUM COM 56585A102 554 1 0.18 135 51.69 0.0309
2026-02-03 2025-12-31 13F MARATHON PETROLEUM COM 56585A102 553 1 0.18 90 -16.04 0.0199
2025-11-12 2025-09-30 13F MARATHON PETROLEUM COM 56585A102 552 2 0.36 106 16.48 0.0239
2025-08-07 2025-06-30 13F MARATHON PETROLEUM COM 56585A102 550 1 0.18 91 15.19 0.0223
2025-05-06 2025-03-31 13F MARATHON PETROLEUM COM 56585A102 549 2 0.37 80 3.95 0.0211
2025-01-14 2024-12-31 13F MARATHON PETROLEUM COM 56585A102 547 2 0.37 76 -13.64 0.0198
2024-10-21 2024-09-30 13F MARATHON PETROLEUM COM 56585A102 545 267 96.04 89 83.33 0.0246
2024-07-31 2024-06-30 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 48 -14.29 0.0138
2024-05-14 2024-03-31 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 56 36.59 0.0171
2024-01-18 2023-12-31 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 41 0.0137
2023-11-06 2023-09-30 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 0 0.0154
2023-08-08 2023-06-30 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 0 0.0115
2023-05-10 2023-03-31 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 0 0.0147
2023-01-26 2022-12-31 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 0 -100.00 0.0137
2022-10-31 2022-09-30 13F MARATHON PETROLEUM COM 56585A102 278 0 0.00 28 21.74 0.0120
2022-08-12 2022-06-30 13F MARATHON PETROLEUM COM 56585A102 278 -45 -13.93 23 -17.86 0.0094
2022-04-26 2022-03-31 13F MARATHON PETROLEUM CORP COM COM 56585A102 323 0 0.00 28 33.33 0.0097
2022-02-04 2021-12-31 13F MARATHON PETROLEUM CORP COM COM 56585A102 323 0 0.00 21 5.00 0.0069
2021-11-10 2021-09-30 13F MARATHON PETROLEUM CORP COM COM 56585A102 323 0 0.00 20 0.00 0.0070
2021-08-05 2021-06-30 13F MARATHON PETROLEUM CORP COM COM 56585A102 323 2 0.62 20 17.65 0.0072
2021-05-03 2021-03-31 13F MARATHON PETROLEUM CORP COM COM 56585A102 321 4 1.26 17 30.77 0.0068
2021-02-09 2020-12-31 13F MARATHON PETROLEUM CORP COM COM 56585A102 317 4 1.28 13 44.44 0.0054
2020-11-04 2020-09-30 13F MARATHON PETROLEUM CORP COM COM 56585A102 313 5 1.62 9 -18.18 0.0038
2020-08-12 2020-06-30 13F MARATHON PETROLEUM CORP COM COM 56585A102 308 5 1.65 11 57.14 0.0052
2020-05-13 2020-03-31 13F MARATHON PETROLEUM CORP COM COM 56585A102 303 6 2.02 7 -61.11 0.0035
2020-02-12 2019-12-31 13F MARATHON PETROLEUM CORP COM COM 56585A102 297 2 0.68 18 0.00 0.0085
2019-11-13 2019-09-30 13F MARATHON PETROLEUM CORP COM COM 56585A102 295 3 1.03 18 12.50 0.0094
2019-08-07 2019-06-30 13F MARATHON PETROLEUM CORP COM COM 56585A102 292 3 1.04 16 -5.88 0.0083
2019-05-13 2019-03-31 13F MARATHON PETROLEUM CORP COM COM 56585A102 289 3 1.05 17 0.00 0.0094
2019-02-05 2018-12-31 13F MARATHON PETE CORP COM COM 56585A102 286 2 0.70 17 -26.09 0.0095
2018-11-13 2018-09-30 13F MARATHON PETE CORP COM COM 56585A102 284 2 0.71 23 15.00 0.0116
2018-08-13 2018-06-30 13F MARATHON PETE CORP COM COM 56585A102 282 1 0.36 20 -4.76 0.0108
2018-05-11 2018-03-31 13F MARATHON PETE CORP COM COM 56585A102 281 2 0.72 21 16.67 0.0123
2018-02-13 2017-12-31 13F MARATHON PETE CORP COM COM 56585A102 279 2 0.72 18 12.50 0.0108
2017-11-13 2017-09-30 13F MARATHON PETE CORP COM COM 56585A102 277 2 0.73 16 14.29 0.0104
2017-08-07 2017-06-30 13F Marathon Petroleum COM 56585A102 275 2 0.73 14 0.00 0.0088
2017-05-01 2017-03-31 13F MARATHON PETE CORP COM COM 56585A102 273 2 0.74 14 0.00 0.0089
2017-01-19 2016-12-31 13F MARATHON PETE CORP COM COM 56585A102 271 2 0.74 14 27.27 0.0096
2016-11-02 2016-09-30 13F MARATHON PETE CORP COM COM 56585A102 269 2 0.75 11 10.00 0.0090
2016-08-10 2016-06-30 13F MARATHON PETE CORP COM COM 56585A102 267 2 0.75 10 0.00 0.0121
2016-05-12 2016-03-31 13F MARATHON PETE CORP COM COM 56585A102 265 3 1.15 10 -28.57 0.0161
2016-01-22 2015-12-31 13F MARATHON PETE CORP COM COM 56585A102 262 1 0.38 14 16.67 0.0159
2015-11-13 2015-09-30 13F MARATHON PETE CORP COM COM 56585A102 261 2 0.77 12 -14.29 0.0175
2015-08-11 2015-06-30 13F MARATHON PETE CORP COM COM 56585A102 259 130 100.78 14 7.69 0.0077
2015-05-14 2015-03-31 13F MARATHON PETE CORP COM COM 56585A102 129 129 0.00 13 0.0076
2015-02-11 2014-12-31 13F Marathon Petroleum COM 56585A102 0 -128 -100.00 0 -100.00
2014-11-14 2014-09-30 13F Marathon Petroleum COM 56585A102 128 -129 -50.19 11 -45.00 0.0071
2014-08-15 2014-06-30 13F Marathon Petroleum COM 56585A102 257 1 0.39 20 -9.09 0.0117
2014-05-14 2014-03-31 13F Marathon Petroleum COM 56585A102 256 256 22 0.0139
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.