Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionAbacus Planning Group, Inc.
Latest Disclosed Ownership2,934 shares
Latest Disclosed Value $ 716,424
Abacus Planning Group, Inc. reports 0.47% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 7, 2026 - Abacus Planning Group, Inc. filed a 13F-HR form disclosing ownership of 2,934 shares of Marathon Petroleum Corporation (US:MPC) valued at $716,424 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 2,948 shares of Marathon Petroleum Corporation. This represents a change in shares of -0.47% during the quarter. The current value of the position is $783,994 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)
2026-04-07 2026-03-31 13F MARATHON PETE COM 56585A102 2,934 -14 -0.47 716 49.48 0.0964
2026-01-16 2025-12-31 13F MARATHON PETE COM 56585A102 2,948 164 5.89 479 -10.63 0.0638
2025-10-22 2025-09-30 13F MARATHON PETE COM 56585A102 2,784 0 0.00 537 16.02 0.0740
2025-07-21 2025-06-30 13F/A-1 MARATHON PETE COM 56585A102 2,784 -852 -23.43 462 -12.67 0.0688
2025-04-14 2025-03-31 13F MARATHON PETE COM 56585A102 3,636 422 13.13 530 18.08 0.0928
2025-02-03 2024-12-31 13F MARATHON PETE COM 56585A102 3,214 -59 -1.80 448 -15.95 0.0788
2024-10-02 2024-09-30 13F MARATHON PETE COM 56585A102 3,273 -828 -20.19 533 -25.04 0.0953
2024-07-31 2024-06-30 13F MARATHON PETE COM 56585A102 4,101 25 0.61 711 -13.40 0.1380
2024-04-12 2024-03-31 13F MARATHON PETE COM 56585A102 4,076 0 0.00 821 35.93 0.1605
2024-01-19 2023-12-31 13F MARATHON PETE COM 56585A102 4,076 0 0.00 605 -1.95 0.1275
2023-10-11 2023-09-30 13F MARATHON PETE COM 56585A102 4,076 -40 -0.97 617 28.60 0.1501
2023-07-07 2023-06-30 13F MARATHON PETE COM 56585A102 4,116 40 0.98 480 -12.75 0.1161
2023-04-18 2023-03-31 13F MARATHON PETE COM 56585A102 4,076 0 0.00 550 15.82 0.1416
2023-01-19 2022-12-31 13F MARATHON PETE COM 56585A102 4,076 876 27.38 474 49.06 0.1297
2022-10-19 2022-09-30 13F MARATHON PETE COM 56585A102 3,200 -258 -7.46 318 11.97 0.0960
2022-07-18 2022-06-30 13F MARATHON PETE COM 56585A102 3,458 0 0.00 284 -4.05 0.0837
2022-04-13 2022-03-31 13F MARATHON PETE COM 56585A102 3,458 3,458 296 0.0797
2020-01-30 2019-12-31 13F MARATHON PETE COM 56585A102 0 -3,327 -100.00 0 -100.00
2019-11-01 2019-09-30 13F MARATHON PETE COM 56585A102 3,327 3,327 202 0.1001
2019-08-12 2019-06-30 13F MARATHON PETROLEUM COM 56585A102 0 -3,404 -100.00 0 -100.00
2019-04-25 2019-03-31 13F MARATHON PETROLEUM COM 56585A102 3,404 -298 -8.05 204 -6.42 0.1275
2019-02-15 2018-12-31 13F/A-2 MARATHON PETROLEUM COM 56585A102 3,702 469 14.51 218 -15.50 0.1653
2019-02-13 2018-12-31 13F/A-1 MARATHON PETROLEUM COM 56585A102 10,115 10,111,767 773 586,085.5852
2019-01-25 2018-12-31 13F MAGELLAN MIDSTREAM COM 56585A102 3,702 -6,413 218
2018-10-31 2018-09-30 13F MARATHON PETROLEUM COM 56585A102 3,233 0 0.00 258 14.16 0.1731
2018-07-26 2018-06-30 13F MARATHON PETROLEUM COM 56585A102 3,233 0 0.00 226 -4.24 0.1698
2018-05-04 2018-03-31 13F MARATHON PETROLEUM COM 56585A102 3,233 3,233 236 0.1924
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.