Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionBuckley Wealth Management, LLC
Latest Disclosed Ownership6,300 shares
Latest Disclosed Value $ 1,538,334
Buckley Wealth Management, LLC ownership in MPC / Marathon Petroleum Corporation

On May 13, 2026 - Buckley Wealth Management, LLC filed a 13F-HR form disclosing ownership of 6,300 shares of Marathon Petroleum Corporation (US:MPC) valued at $1,538,334 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 6,300 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $1,683,423 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)
2026-05-13 2026-03-31 13F MARATHON PETE COM 56585A102 6,300 0 0.00 1,538 50.20 0.3926
2026-02-12 2025-12-31 13F MARATHON PETE COM 56585A102 6,300 -500 -7.35 1,025 -21.83 0.2717
2025-11-14 2025-09-30 13F MARATHON PETE COM 56585A102 6,800 0 0.00 1,311 16.03 0.3588
2025-08-11 2025-06-30 13F MARATHON PETE COM 56585A102 6,800 -500 -6.85 1,130 6.21 0.3380
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 7,300 -7,025 -49.04 1,064 -46.80 0.3308
2025-02-10 2024-12-31 13F MARATHON PETE COM 56585A102 14,325 75 0.53 1,998 -13.92 0.6118
2024-10-18 2024-09-30 13F MARATHON PETE COM 56585A102 14,250 890 6.66 2,321 0.17 0.7151
2024-07-24 2024-06-30 13F MARATHON PETE COM 56585A102 13,360 -1,700 -11.29 2,318 -23.63 0.7346
2024-04-16 2024-03-31 13F MARATHON PETE COM 56585A102 15,060 -1,145 -7.07 3,035 26.21 0.9730
2024-01-18 2023-12-31 13F MARATHON PETE COM 56585A102 16,205 -480 -2.88 2,404 -4.79 0.8346
2023-10-13 2023-09-30 13F MARATHON PETE COM 56585A102 16,685 160 0.97 2,525 31.10 0.9447
2023-07-12 2023-06-30 13F MARATHON PETE COM 56585A102 16,525 -1,055 -6.00 1,927 -18.73 0.6553
2023-04-14 2023-03-31 13F MARATHON PETE COM 56585A102 17,580 -1,310 -6.93 2,370 7.83 0.8729
2023-02-10 2022-12-31 13F MARATHON PETE COM 56585A102 18,890 -2,020 -9.66 2,199 5.83 0.8002
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 20,910 9,910 90.09 2,077 129.76 0.7656
2022-08-04 2022-06-30 13F MARATHON PETE COM 56585A102 11,000 -57 -0.52 904 -4.34 0.2909
2022-05-06 2022-03-31 13F MARATHON PETE COM 56585A102 11,057 -2,000 -15.32 945 13.04 0.2558
2022-02-02 2021-12-31 13F MARATHON PETE COM 56585A102 13,057 0 0.00 836 3.59 0.2441
2021-11-09 2021-09-30 13F MARATHON PETE COM 56585A102 13,057 0 0.00 807 2.28 0.2610
2021-07-27 2021-06-30 13F MARATHON PETE COM 56585A102 13,057 0 0.00 789 13.04 0.2707
2021-04-30 2021-03-31 13F MARATHON PETE COM 56585A102 13,057 0 0.00 698 29.26 0.2587
2021-01-20 2020-12-31 13F MARATHON PETE COM 56585A102 13,057 0 0.00 540 40.99 0.2214
2020-10-19 2020-09-30 13F MARATHON PETE COM 56585A102 13,057 0 0.00 383 -21.52 0.1719
2020-07-15 2020-06-30 13F MARATHON PETE COM 56585A102 13,057 0 0.00 488 58.44 0.2213
2020-04-10 2020-03-31 13F MARATHON PETE COM 56585A102 13,057 -840 -6.04 308 -63.20 0.1671
2020-01-16 2019-12-31 13F MARATHON PETE COM 56585A102 13,897 -1,132 -7.53 837 -8.32 0.3798
2019-10-11 2019-09-30 13F MARATHON PETE COM 56585A102 15,029 68 0.45 913 9.21 0.4469
2019-07-19 2019-06-30 13F MARATHON PETE COM 56585A102 14,961 142 0.96 836 -5.75 0.3913
2019-04-11 2019-03-31 13F MARATHON PETE COM 56585A102 14,819 18 0.12 887 1.60 0.4201
2019-02-01 2018-12-31 13F MARATHON PETE COM 56585A102 14,801 658 4.65 873 -22.81 0.4501
2018-10-25 2018-09-30 13F MARATHON PETE COM 56585A102 14,143 86 0.61 1,131 14.71 0.4940
2018-07-31 2018-06-30 13F MARATHON PETE COM 56585A102 14,057 0 0.00 986 -4.09 0.4662
2018-05-08 2018-03-31 13F MARATHON PETE COM 56585A102 14,057 -100 -0.71 1,028 10.06 0.5082
2018-02-07 2017-12-31 13F MARATHON PETE COM 56585A102 14,157 14,157 934 0.4685
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.