Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionCerity Partners LLC
Latest Disclosed Ownership204,679 shares
Latest Disclosed Value $ 49,975,420
Cerity Partners LLC reports 3.59% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - Cerity Partners LLC filed a 13F-HR form disclosing ownership of 204,679 shares of Marathon Petroleum Corporation (US:MPC) valued at $49,978,518 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 197,590 shares of Marathon Petroleum Corporation. This represents a change in shares of 3.59% during the quarter. The current value of the position is $54,692,276 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)
2026-05-15 2026-03-31 13F MARATHON PETE COM 56585A102 204,679 7,089 3.59 49,975 55.53 0.0351
2026-02-11 2025-12-31 13F MARATHON PETE COM 56585A102 197,590 4,165 2.15 32,134 -13.81 0.0468
2025-10-22 2025-09-30 13F MARATHON PETE COM 56585A102 193,425 12,788 7.08 37,281 24.25 0.0605
2025-08-13 2025-06-30 13F MARATHON PETE Stock 56585A102 180,637 -5,138 -2.77 30,006 10.86 0.0535
2025-04-30 2025-03-31 13F MARATHON PETE Stock 56585A102 185,775 -8,145 -4.20 27,066 -1.76 0.0548
2025-02-13 2024-12-31 13F MARATHON PETE Stock 56585A102 193,920 16,960 9.58 27,550 -4.44 0.0598
2024-11-12 2024-09-30 13F MARATHON PETE Stock 56585A102 176,960 12,331 7.49 28,828 0.94 0.0638
2024-08-13 2024-06-30 13F MARATHON PETE COM 56585A102 164,629 1,061 0.65 28,560 -13.35 0.0752
2024-05-14 2024-03-31 13F MARATHON PETE Equities 56585A102 163,568 25,370 18.36 32,958 60.76 0.0870
2024-01-26 2023-12-31 13F MARATHON PETE Equity 56585A102 138,198 25,573 22.71 20,503 20.29 0.0674
2023-11-14 2023-09-30 13F MARATHON PETE Equities 56585A102 112,625 -28,808 -20.37 17,045 3.36 0.0829
2023-08-14 2023-06-30 13F MARATHON PETE Stock 56585A102 141,433 33,314 30.81 16,490 -39.91 0.0642
2023-05-11 2023-03-31 13F MARATHON PETE Equities 56585A102 108,119 -285 -0.26 27,444 117.52 0.0647
2023-02-15 2022-12-31 13F MARATHON PETE Equities 56585A102 108,404 1,199 1.12 12,617 18.48 0.0808
2022-11-14 2022-09-30 13F MARATHON PETE Equities 56585A102 107,205 -908 -0.84 10,649 19.83 0.1280
2022-08-10 2022-06-30 13F MARATHON PETE COM 56585A102 108,113 69,431 179.49 8,887 168.81 0.0982
2022-04-25 2022-03-31 13F MARATHON PETE Stock 56585A102 38,682 -127,956 -76.79 3,306 -69.01 0.0514
2022-02-14 2021-12-31 13F MARATHON PETE Stock 56585A102 166,638 25,870 18.38 10,668 22.61 0.1623
2021-10-25 2021-09-30 13F Marathon Pete Stock 56585A102 140,768 30,352 27.49 8,701 30.43 0.1914
2021-08-11 2021-06-30 13F MARATHON PETE Stock 56585A102 110,416 -50,557 -31.41 6,671 -22.52 0.1460
2021-08-11 2021-03-31 13F/A-1 MARATHON PETE Stock 56585A102 160,973 136,575 559.78 8,610 753.32 0.2045
2021-05-12 2021-03-31 13F MARATHON PETE Stock 56585A102 160,969 136,571 8,610 0.2550
2021-02-11 2020-12-31 13F MARATHON PETE Stock 56585A102 24,398 9,753 66.60 1,009 134.65 0.0324
2020-11-12 2020-09-30 13F MARATHON PETE COM 56585A102 14,645 -9,816 -40.13 430 -53.01 0.0177
2020-08-17 2020-06-30 13F/A-1 MARATHON PETE COM 56585A102 24,461 -36,057 -59.58 915 -35.97 0.0505
2020-08-14 2020-06-30 13F MARATHON PETE COM 56585A102 24,461 -36,057 915 50,464.4383
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 60,518 -1,466 -2.37 1,429 -61.74 0.0900
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 61,984 -19,953 -24.35 3,735 -24.97 0.1904
2019-10-30 2019-09-30 13F MARATHON PETE COM 56585A102 81,937 -30,187 -26.92 4,978 -20.54 0.2922
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 112,124 65,050 138.19 6,265 122.40 0.3950
2019-05-14 2019-03-31 13F MARATHON PETE COM 56585A102 47,074 47,074 2,817 0.1897
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.