Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionParkside Financial Bank & Trust
Latest Disclosed Ownership6,814 shares
Latest Disclosed Value $ 1,663,843
Parkside Financial Bank & Trust reports 28.13% increase in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - Parkside Financial Bank & Trust filed a 13F-HR form disclosing ownership of 6,814 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,663,843 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 5,318 shares of Marathon Petroleum Corporation. This represents a change in shares of 28.13% 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)
2026-05-13 2026-03-31 13F MARATHON PETE COM 56585A102 6,814 1,496 28.13 1,664 92.48 0.0733
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 5,318 445 9.13 865 -7.99 0.0646
2025-10-30 2025-09-30 13F MARATHON PETE COM 56585A102 4,873 169 3.59 939 20.23 0.0725
2025-08-07 2025-06-30 13F MARATHON PETE COM 56585A102 4,704 672 16.67 781 33.05 0.0841
2025-05-08 2025-03-31 13F MARATHON PETE COM 56585A102 4,032 512 14.55 587 19.55 0.0746
2025-02-05 2024-12-31 13F MARATHON PETE COM 56585A102 3,520 -33 -0.93 491 -15.05 0.0648
2024-11-07 2024-09-30 13F MARATHON PETE COM 56585A102 3,553 -12 -0.34 579 -6.47 0.0806
2024-08-05 2024-06-30 13F MARATHON PETE COM 56585A102 3,565 -60 -1.66 618 -15.34 0.0969
2024-05-01 2024-03-31 13F MARATHON PETE COM 56585A102 3,625 1,027 39.53 730 89.61 0.1173
2024-02-01 2023-12-31 13F MARATHON PETE COM 56585A102 2,598 87 3.46 385 1.32 0.0701
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 2,511 64 2.62 380 33.33 0.0880
2023-08-15 2023-06-30 13F MARATHON PETE COM 56585A102 2,447 910 59.21 285 37.68 0.0678
2023-05-04 2023-03-31 13F MARATHON PETE COM 56585A102 1,537 106 7.41 207 24.70 0.0558
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 1,431 35 2.51 167 19.42 0.0480
2022-11-01 2022-09-30 13F MARATHON PETE COM 56585A102 1,396 134 10.62 139 34.95 0.0444
2022-07-13 2022-06-30 13F MARATHON PETE COM 56585A102 1,262 20 1.61 103 -2.83 0.0315
2022-05-13 2022-03-31 13F MARATHON PETE COM 56585A102 1,242 43 3.59 106 37.66 0.0283
2022-03-01 2021-12-31 13F/A-1 MARATHON PETE COM 56585A102 1,199 13 1.10 77 4.05 0.0190
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 1,199 13 77 0.0164
2021-10-29 2021-09-30 13F MARATHON PETE COM 56585A102 1,186 67 5.99 74 8.82 0.0218
2021-08-06 2021-06-30 13F MARATHON PETE COM 56585A102 1,119 -476 -29.84 68 -20.00 0.0197
2021-05-10 2021-03-31 13F MARATHON PETE COM 56585A102 1,595 33 2.11 85 30.77 0.0257
2021-02-09 2020-12-31 13F MARATHON PETE COM 56585A102 1,562 210 15.53 65 66.67 0.0204
2020-11-06 2020-09-30 13F MARATHON PETE COM 56585A102 1,352 -13 -0.95 39 -23.53 0.0136
2020-08-10 2020-06-30 13F MARATHON PETE COM 56585A102 1,365 230 20.26 51 88.89 0.0167
2020-05-05 2020-03-31 13F MARATHON PETE COM 56585A102 1,135 69 6.47 27 -57.81 0.0102
2020-01-30 2019-12-31 13F MARATHON PETE COM 56585A102 1,066 405 61.27 64 60.00 0.0187
2019-11-05 2019-09-30 13F MARATHON PETE COM 56585A102 661 208 45.92 40 60.00 0.0129
2019-08-06 2019-06-30 13F MARATHON PETE COM 56585A102 453 -200 -30.63 25 -35.90 0.0081
2019-05-01 2019-03-31 13F MARATHON PETE COM 56585A102 653 -34 -4.95 39 -2.50 0.0132
2019-01-31 2018-12-31 13F MARATHON PETE COM 56585A102 687 340 97.98 40 42.86 0.0143
2018-10-12 2018-09-30 13F MARATHON PETE COM 56585A102 347 -4 -1.14 28 16.67 0.0097
2018-08-03 2018-06-30 13F MARATHON PETE COM 56585A102 351 18 5.41 24 0.00 0.0089
2018-05-02 2018-03-31 13F MARATHON PETE COM 56585A102 333 25 8.12 24 14.29 0.0091
2018-02-05 2017-12-31 13F MARATHON PETE COM 56585A102 308 20 6.94 21 31.25 0.0077
2017-10-27 2017-09-30 13F MARATHON PETE COM 56585A102 288 0 0.00 16 6.67 0.0063
2017-07-27 2017-06-30 13F MARATHON PETE COM 56585A102 288 130 82.28 15 87.50 0.0062
2017-05-05 2017-03-31 13F MARATHON PETE COM 56585A102 158 5 3.27 8 14.29 0.0034
2017-02-08 2016-12-31 13F MARATHON PETE COM 56585A102 153 54 54.55 7 75.00 0.0031
2016-11-10 2016-09-30 13F MARATHON PETE COM 56585A102 99 57 135.71 4 100.00 0.0018
2016-08-02 2016-06-30 13F MARATHON PETE COM 56585A102 42 0 0.00 2 0.00 0.0010
2016-05-03 2016-03-31 13F MARATHON PETE COM 56585A102 42 -46 -52.27 2 -60.00 0.0010
2016-02-02 2015-12-31 13F MARATHON PETE COM 56585A102 88 -14 -13.73 5 0.00 0.0025
2015-11-06 2015-09-30 13F MARATHON PETE COM 56585A102 102 102 5 0.0028
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.