Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionRMB Capital Management, LLC
Latest Disclosed Ownership9,391 shares
Latest Disclosed Value $ 2,293,125
RMB Capital Management, LLC reports 0.38% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - RMB Capital Management, LLC filed a 13F-HR form disclosing ownership of 9,391 shares of Marathon Petroleum Corporation (MX:MPC) valued at $2,293,125 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,427 shares of Marathon Petroleum Corporation. This represents a change in shares of -0.38% 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)
2026-05-15 2026-03-31 13F MARATHON PETE COM 56585A102 9,391 -36 -0.38 2,293 49.58 0.0309
2026-02-17 2025-12-31 13F MARATHON PETE COM 56585A102 9,427 -76 -0.80 1,533 -16.28 0.0266
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 9,503 253 2.74 1,832 19.21 0.0336
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 9,250 4,828 109.18 1,537 138.51 0.0292
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 4,422 -89 -1.97 644 2.38 0.0159
2025-02-13 2024-12-31 13F MARATHON PETE COM 56585A102 4,511 0 0.00 629 -14.31 0.0145
2024-11-06 2024-09-30 13F MARATHON PETE COM 56585A102 4,511 12 0.27 735 -5.90 0.0167
2024-08-13 2024-06-30 13F MARATHON PETE COM 56585A102 4,499 -87 -1.90 780 -15.58 0.0187
2024-05-15 2024-03-31 13F MARATHON PETE COM 56585A102 4,586 -416 -8.32 924 24.53 0.0212
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 5,002 112 2.29 742 0.27 0.0227
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 4,890 31 0.64 740 30.74 0.0253
2023-08-11 2023-06-30 13F MARATHON PETE COM 56585A102 4,859 103 2.17 567 -11.70 0.0186
2023-05-11 2023-03-31 13F MARATHON PETE COM 56585A102 4,756 0 0.00 641 15.91 0.0224
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 4,756 -716 -13.08 554 1.65 0.0197
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 5,472 0 0.00 544 20.89 0.0203
2022-08-16 2022-06-30 13F/A-1 MARATHON PETE COM 56585A102 5,472 0 0.00 450 -3.85 0.0155
2022-08-01 2022-06-30 13F MARATHON PETE COM 56585A102 5,472 0 450 0.0167
2022-05-06 2022-03-31 13F MARATHON PETE COM 56585A102 5,472 -17,294 -75.96 468 -67.88 0.0148
2022-01-26 2021-12-31 13F MARATHON PETE COM 56585A102 22,766 -36,644 -61.68 1,457 -60.32 0.0440
2021-10-20 2021-09-30 13F MARATHON PETE COM 56585A102 59,410 -18,388 -23.64 3,672 -21.89 0.1206
2021-08-13 2021-06-30 13F MARATHON PETE COM 56585A102 77,798 -8,791 -10.15 4,701 1.49 0.1572
2021-05-12 2021-03-31 13F MARATHON PETE COM 56585A102 86,589 -5,127 -5.59 4,632 22.12 0.1712
2021-02-11 2020-12-31 13F MARATHON PETE COM 56585A102 91,716 -1,389 -1.49 3,793 38.89 0.1387
2020-11-10 2020-09-30 13F MARATHON PETE COM 56585A102 93,105 58,257 167.17 2,731 109.59 0.1181
2020-08-05 2020-06-30 13F MARATHON PETE COM 56585A102 34,848 34,848 1,303 0.0574
2020-05-11 2020-03-31 13F MARATHON PETE COM 56585A102 0 -10,129 -100.00 0 -100.00
2020-02-13 2019-12-31 13F MARATHON PETE COM 56585A102 10,129 422 4.35 610 3.39 0.0170
2019-11-12 2019-09-30 13F MARATHON PETE COM 56585A102 9,707 -152 -1.54 590 7.08 0.0155
2019-08-13 2019-06-30 13F MARATHON PETE COM 56585A102 9,859 -86 -0.86 551 -7.39 0.0139
2019-05-15 2019-03-31 13F MARATHON PETE COM 56585A102 9,945 4,308 76.42 595 78.68 0.0150
2019-02-13 2018-12-31 13F MARATHON PETE COM 56585A102 5,637 -1,949 -25.69 333 -45.14 0.0085
2018-11-14 2018-09-30 13F MARATHON PETE COM 56585A102 7,586 4,470 143.45 607 177.17 0.0146
2018-08-13 2018-06-30 13F MARATHON PETE COM 56585A102 3,116 16 0.52 219 -3.52 0.0052
2018-05-14 2018-03-31 13F MARATHON PETE COM 56585A102 3,100 -316 -9.25 227 0.89 0.0058
2018-02-14 2017-12-31 13F MARATHON PETE COM 56585A102 3,416 3,416 225 0.0058
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.