Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionAnchor Capital Advisors Llc
Latest Disclosed Ownership72,629 shares
Latest Disclosed Value $ 17,734,518
Anchor Capital Advisors Llc reports 6.32% increase in ownership of MPC / Marathon Petroleum Corporation

On May 12, 2026 - Anchor Capital Advisors Llc filed a 13F-HR form disclosing ownership of 72,629 shares of Marathon Petroleum Corporation (MX:MPC) valued at $17,734,518 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 68,313 shares of Marathon Petroleum Corporation. This represents a change in shares of 6.32% 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)
2026-05-12 2026-03-31 13F MARATHON PETE COM 56585A102 72,629 4,316 6.32 17,735 59.64 0.5049
2026-02-10 2025-12-31 13F MARATHON PETE COM 56585A102 68,313 -817 -1.18 11,110 -16.62 0.3219
2025-10-30 2025-09-30 13F MARATHON PETE COM 56585A102 69,130 -1,525 -2.16 13,324 13.53 0.3856
2025-08-06 2025-06-30 13F MARATHON PETE COM 56585A102 70,655 -1,034 -1.44 11,737 12.37 0.3445
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 71,689 -1,330 -1.82 10,444 2.53 0.3117
2025-02-05 2024-12-31 13F MARATHON PETE COM 56585A102 73,019 -373 -0.51 10,186 -14.80 0.2905
2024-10-31 2024-09-30 13F MARATHON PETE COM 56585A102 73,392 -272 -0.37 11,956 -6.44 0.3176
2024-08-06 2024-06-30 13F MARATHON PETE COM 56585A102 73,664 -6,634 -8.26 12,779 -21.02 0.3594
2024-05-07 2024-03-31 13F MARATHON PETE COM 56585A102 80,298 -5,347 -6.24 16,180 27.34 0.4240
2024-02-05 2023-12-31 13F MARATHON PETE COM 56585A102 85,645 -1,416 -1.63 12,706 -3.56 0.3353
2023-11-09 2023-09-30 13F MARATHON PETE COM 56585A102 87,061 -25,863 -22.90 13,176 0.07 0.3682
2023-08-04 2023-06-30 13F MARATHON PETE COM 56585A102 112,924 -23,372 -17.15 13,167 -28.35 0.3415
2023-05-03 2023-03-31 13F MARATHON PETE COM 56585A102 136,296 -23,998 -14.97 18,377 -1.50 0.4859
2023-02-10 2022-12-31 13F MARATHON PETE COM 56585A102 160,294 -10,971 -6.41 18,657 9.66 0.4789
2022-11-09 2022-09-30 13F MARATHON PETE COM 56585A102 171,265 -40,405 -19.09 17,012 -2.24 0.4685
2022-08-04 2022-06-30 13F MARATHON PETE COM 56585A102 211,670 -111,175 -34.44 17,401 -36.96 0.4411
2022-05-06 2022-03-31 13F MARATHON PETE COM 56585A102 322,845 -9,508 -2.86 27,603 29.79 0.5843
2022-02-10 2021-12-31 13F MARATHON PETE COM 56585A102 332,353 -10,158 -2.97 21,267 0.45 0.4212
2021-11-02 2021-09-30 13F MARATHON PETE COM 56585A102 342,511 -5,549 -1.59 21,171 0.67 0.4396
2021-08-16 2021-06-30 13F MARATHON PETE COM 56585A102 348,060 4,294 1.25 21,030 14.37 0.4230
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 343,766 23,908 7.47 18,388 39.00 0.3886
2021-02-08 2020-12-31 13F MARATHON PETE COM 56585A102 319,858 -44,599 -12.24 13,229 23.72 0.3019
2020-11-13 2020-09-30 13F MARATHON PETE COM 56585A102 364,457 -6,725 -1.81 10,693 -22.93 0.2712
2020-08-10 2020-06-30 13F MARATHON PETE COM 56585A102 371,182 91,773 32.85 13,875 110.23 0.3573
2020-05-07 2020-03-31 13F MARATHON PETE COM 56585A102 279,409 -9,552 -3.31 6,600 -62.09 0.1954
2020-01-27 2019-12-31 13F MARATHON PETE COM 56585A102 288,961 40,852 16.47 17,410 15.50 0.3780
2019-10-25 2019-09-30 13F MARATHON PETE COM 56585A102 248,109 212,197 590.88 15,073 651.02 0.5435
2019-08-01 2019-06-30 13F MARATHON PETE COM 56585A102 35,912 35,912 2,007 0.0727
2018-08-07 2018-06-30 13F MARATHON PETE COM 56585A102 0 -12,500 -100.00 0 -100.00
2018-05-09 2018-03-31 13F MARATHON PETE COM 56585A102 12,500 12,500 914 0.0318
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.