Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionFirst Manhattan Co
Latest Disclosed Ownership17,483 shares
Latest Disclosed Value $ 4,268,999
First Manhattan Co reports 5.88% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 17,483 shares of Marathon Petroleum Corporation (MX:MPC) valued at $4,268,999 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 18,576 shares of Marathon Petroleum Corporation. This represents a change in shares of -5.88% 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 17,483 -1,093 -5.88 4,269 41.28 0.0118
2026-02-17 2025-12-31 13F MARATHON PETE COM 56585A102 18,576 0 0.00 3,021 -15.61 0.0079
2025-11-14 2025-09-30 13F MARATHON PETE COM 56585A102 18,576 0 0.00 3,580 16.05 0.0095
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 18,576 1,427 8.32 3,086 23.50 0.0087
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 17,149 4,772 38.56 2,498 44.73 0.0073
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 12,377 0 0.00 1,727 -14.38 0.0051
2024-11-14 2024-09-30 13F MARATHON PETE COM 56585A102 12,377 80 0.65 2,016 -5.49 0.0060
2024-08-15 2024-06-30 13F/A-1 MARATHON PETE COM 56585A102 12,297 1 0.01 2,133 -13.89 0.0068
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 12,297 1 2,133 0.0068
2024-05-15 2024-03-31 13F MARATHON PETE COM 56585A102 12,296 -10 -0.08 2,478 35.73 0.0080
2024-02-13 2023-12-31 13F MARATHON PETE COM 56585A102 12,306 2 0.02 1,826 -1.99 0.0063
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 12,304 1 0.01 1,862 29.85 0.0069
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 12,303 -600 -4.65 1,435 -17.54 0.0053
2023-05-15 2023-03-31 13F MARATHON PETE COM 56585A102 12,903 105 0.82 1,740 16.79 0.0067
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 12,798 10 0.08 1,490 17.24 0.0055
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 12,788 0 0.00 1,270 20.84 0.0054
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 12,788 -251 -1.92 1,051 -5.66 0.0042
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 13,039 -4,000 -23.48 1,114 2.20 0.0036
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 17,039 0 0.00 1,090 3.51 0.0036
2021-11-15 2021-09-30 13F MARATHON PETE COM 56585A102 17,039 -649 -3.67 1,053 -1.40 0.0039
2021-08-16 2021-06-30 13F MARATHON PETE COM 56585A102 17,688 800 4.74 1,068 18.27 0.0039
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 16,888 -20 -0.12 903 29.18 0.0039
2021-02-16 2020-12-31 13F MARATHON PETE COM 56585A102 16,908 0 0.00 699 40.93 0.0033
2020-11-12 2020-09-30 13F MARATHON PETROLEUM COMMON 56585A102 16,908 -432 -2.49 496 -23.46 0.0026
2020-08-14 2020-06-30 13F MARATHON PETROLEUM COMMON 56585A102 17,340 -134 -0.77 648 57.28 0.0037
2020-05-06 2020-03-31 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 412 -60.84 0.0027
2020-02-13 2019-12-31 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 1,052 -0.85 0.0053
2019-11-13 2019-09-30 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 1,061 8.71 0.0058
2019-08-16 2019-06-30 13F MARATHON PETROLEUM COMMON 56585A102 17,474 -1,193 -6.39 976 -12.62 0.0054
2019-04-12 2019-03-31 13F MARATHON PETROLEUM COMMON 56585A102 18,667 1,193 6.83 1,117 8.34 0.0064
2019-01-30 2018-12-31 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 1,031 -26.20 0.0064
2018-10-15 2018-09-30 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 1,397 14.04 0.0074
2018-08-01 2018-06-30 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 1,225 -4.07 0.0071
2018-04-20 2018-03-31 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 1,277 10.85 0.0073
2018-01-22 2017-12-31 13F MARATHON PETROLEUM COMMON 56585A102 17,474 0 0.00 1,152 17.67 0.0063
2017-10-25 2017-09-30 13F MARATHON PETROLEUM COMMON 56585A102 17,474 452 2.66 979 10.00 0.0056
2017-08-10 2017-06-30 13F/A-2 MARATHON PETROLEUM COMMON 56585A102 17,022 0 0.00 890 3.49 0.0052
2017-08-01 2017-06-30 13F/A-1 MARATHON PETROLEUM COMMON 56585A102 17,022 0 890 0.0052
2017-07-28 2017-06-30 13F MARATHON PETROLEUM COMMON 56585A102 17,022 0 890
2017-04-25 2017-03-31 13F/A-1 MARATHON PETROLEUM COMMON 56585A102 17,022 0 0.00 860 0.35 0.0051
2017-04-24 2017-03-31 13F MARATHON PETROLEUM COMMON 56585A102 17,533 711
2017-01-25 2016-12-31 13F MARATHON PETROLEUM COMMON 56585A102 17,022 -511 -2.91 857 20.53 0.0052
2016-10-20 2016-09-30 13F MARATHON PETROLEUM COMMON 56585A102 17,533 0 0.00 711 6.92 0.0043
2016-07-14 2016-06-30 13F MARATHON PETROLEUM COMMON 56585A102 17,533 611 3.61 665 5.72 0.0041
2016-04-22 2016-03-31 13F MARATHON PETROLEUM COMMON 56585A102 16,922 0 0.00 629 -28.28 0.0039
2016-01-20 2015-12-31 13F MARATHON PETROLEUM COMMON 56585A102 16,922 16,000 1,735.36 877 1,988.10 0.0054
2015-10-26 2015-09-30 13F MARATHON PETROLEUM COMMON 56585A102 922 -500 -35.16 42 -43.24 0.0003
2015-07-17 2015-06-30 13F MARATHON PETROLEUM COMMON 56585A102 1,422 511 56.09 74 -20.43 0.0004
2015-04-30 2015-03-31 13F MARATHON PETROLEUM COMMON 56585A102 911 -53 -5.50 93 6.90 0.0005
2015-01-20 2014-12-31 13F MARATHON PETROLEUM COMMON 56585A102 964 25 2.66 87 10.13 0.0005
2014-10-23 2014-09-30 13F MARATHON PETROLEUM COMMON 56585A102 939 0 0.00 79 8.22 0.0005
2014-08-14 2014-06-30 13F/A-1 MARATHON PETROLEUM COMMON 56585A102 939 -122 -11.50 73 -20.65 0.0005
2014-05-16 2014-03-31 13F MARATHON PETROLEUM COMMON 56585A102 1,061 0 0.00 92 -5.15 0.0006
2014-02-04 2013-12-31 13F MARATHON PETROLEUM COMMON 56585A102 1,061 600 130.15 97 234.48 0.0006
2013-10-29 2013-09-30 13F MARATHON PETROLEUM COMMON 56585A102 461 -172 -27.17 29 -35.56 0.0002
2013-08-13 2013-06-30 13F MARATHON PETROLEUM COMMON 56585A102 633 633 45 0.0003
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.