Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionXponance, Inc.
Latest Disclosed Ownership50,680 shares
Latest Disclosed Value $ 12,375,042
Xponance, Inc. reports 15.28% increase in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - Xponance, Inc. filed a 13F-HR form disclosing ownership of 50,680 shares of Marathon Petroleum Corporation (MX:MPC) valued at $12,375,042 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 43,964 shares of Marathon Petroleum Corporation. This represents a change in shares of 15.28% 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 50,680 6,716 15.28 12,375 73.10 0.0880
2026-02-12 2025-12-31 13F MARATHON PETE COM 56585A102 43,964 -25,186 -36.42 7,150 -46.36 0.0536
2025-11-12 2025-09-30 13F MARATHON PETE COM 56585A102 69,150 -3,342 -4.61 13,328 10.68 0.1055
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 72,492 10,508 16.95 12,042 33.34 0.1006
2025-05-01 2025-03-31 13F MARATHON PETE COM 56585A102 61,984 -808 -1.29 9,030 3.09 0.0873
2025-02-11 2024-12-31 13F MARATHON PETE COM 56585A102 62,792 -1,173 -1.83 8,759 -15.94 0.0799
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 63,965 12,928 25.33 10,421 17.70 0.1006
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 51,037 370 0.73 8,854 -13.28 0.0905
2024-05-13 2024-03-31 13F MARATHON PETE COM 56585A102 50,667 1,818 3.72 10,209 40.87 0.1070
2024-01-31 2023-12-31 13F MARATHON PETE COM 56585A102 48,849 -8,511 -14.84 7,247 -16.51 0.0868
2023-10-24 2023-09-30 13F MARATHON PETE COM 56585A102 57,360 -10,425 -15.38 8,681 9.83 0.1181
2023-07-14 2023-06-30 13F MARATHON PETE COM 56585A102 67,785 -2,920 -4.13 7,904 -17.10 0.1052
2023-04-18 2023-03-31 13F MARATHON PETE COM 56585A102 70,705 -516 -0.72 9,533 15.01 0.1393
2023-01-24 2022-12-31 13F MARATHON PETE COM 56585A102 71,221 5,681 8.67 8,289 27.33 0.1343
2022-10-24 2022-09-30 13F MARATHON PETE COM 56585A102 65,540 12,236 22.96 6,510 48.56 0.1252
2022-08-02 2022-06-30 13F MARATHON PETE COM 56585A102 53,304 14,393 36.99 4,382 31.71 0.0880
2022-04-20 2022-03-31 13F MARATHON PETE COM 56585A102 38,911 -615 -1.56 3,327 31.55 0.0553
2022-01-31 2021-12-31 13F MARATHON PETE COM 56585A102 39,526 7,037 21.66 2,529 25.95 0.0397
2021-11-05 2021-09-30 13F MARATHON PETE COM 56585A102 32,489 -3,097 -8.70 2,008 -6.60 0.0381
2021-08-12 2021-06-30 13F MARATHON PETE COM 56585A102 35,586 7,710 27.66 2,150 44.20 0.0395
2021-05-10 2021-03-31 13F MARATHON PETE COM 56585A102 27,876 -512 -1.80 1,491 27.00 0.0316
2021-02-11 2020-12-31 13F MARATHON PETE COM 56585A102 28,388 1,884 7.11 1,174 50.90 0.0256
2020-10-26 2020-09-30 13F MARATHON PETE COM 56585A102 26,504 41 0.15 778 -21.33 0.0191
2020-08-14 2020-06-30 13F MARATHON PETE COM 56585A102 26,463 26,463 989 0.0255
2015-10-08 2015-09-30 13F MARATHON PETROLEUM COM 056585A10 0 -2,672 -100.00 0 -100.00
2015-07-09 2015-06-30 13F MARATHON PETROLEUM COM 056585A10 2,672 2,672 138 0.0488
2015-04-09 2015-03-31 13F Marathon Petroleum COM 56585A102 0 0 0 0.0000
2015-03-31 2014-06-30 13F Marathon Petroleum COM 56585A102 0 -3,695 -100.00 0 -100.00
2015-03-31 2014-03-31 13F Marathon Petroleum COM 56585A102 3,695 3,695 321 0.1354
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.