Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionGreatmark Investment Partners, Inc.
Latest Disclosed Ownership166,698 shares
Latest Disclosed Value $ 40,704,318
Greatmark Investment Partners, Inc. reports 0.37% increase in ownership of MPC / Marathon Petroleum Corporation

On April 28, 2026 - Greatmark Investment Partners, Inc. filed a 13F-HR form disclosing ownership of 166,698 shares of Marathon Petroleum Corporation (MX:MPC) valued at $40,704,318 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 166,076 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.37% 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)
2026-04-28 2026-03-31 13F MARATHON PETE CORP COM Stock 56585A102 166,698 622 0.37 40,704 50.71 4.7686
2026-01-27 2025-12-31 13F MARATHON PETE CORP COM Stock 56585A102 166,076 -2,451 -1.45 27,009 -16.85 3.1946
2025-10-31 2025-09-30 13F MARATHON PETE CORP COM Stock 56585A102 168,527 -76 -0.05 32,482 15.98 3.8941
2025-07-30 2025-06-30 13F MARATHON PETE CORP COM Stock 56585A102 168,603 4,820 2.94 28,007 17.37 3.5159
2025-05-01 2025-03-31 13F MARATHON PETE CORP COM Stock 56585A102 163,783 2,612 1.62 23,862 6.13 3.2536
2025-02-10 2024-12-31 13F MARATHON PETE CORP COM Stock 56585A102 161,171 5,476 3.52 22,483 -11.36 3.0613
2024-10-31 2024-09-30 13F MARATHON PETE CORP COM Stock 56585A102 155,695 -1,642 -1.04 25,364 -7.07 3.4393
2024-08-08 2024-06-30 13F MARATHON PETE CORP COM Stock 56585A102 157,337 -3,542 -2.20 27,295 -15.80 3.9812
2024-05-09 2024-03-31 13F MARATHON PETE CORP COM Stock 56585A102 160,879 -10,510 -6.13 32,417 27.49 4.6068
2024-02-05 2023-12-31 13F MARATHON PETE CORP COM Stock 56585A102 171,389 -8,861 -4.92 25,427 -6.79 3.9847
2023-11-08 2023-09-30 13F MARATHON PETE CORP COM Stock 56585A102 180,250 -3,870 -2.10 27,279 27.07 4.8238
2023-08-02 2023-06-30 13F MARATHON PETE CORP COM Stock 56585A102 184,120 -9,980 -5.14 21,468 -17.97 3.6140
2023-04-28 2023-03-31 13F MARATHON PETE CORP COM Stock 56585A102 194,100 -1,420 -0.73 26,171 15.00 4.6658
2023-01-30 2022-12-31 13F MARATHON PETE CORP COM Stock 56585A102 195,520 -11,390 -5.50 22,757 10.72 4.1615
2022-11-08 2022-09-30 13F MARATHON PETE CORP COM Stock 56585A102 206,910 -1,250 -0.60 20,552 20.10 3.9667
2022-07-28 2022-06-30 13F MARATHON PETE CORP COM Stock 56585A102 208,160 -11,050 -5.04 17,113 -8.69 3.2847
2022-04-27 2022-03-31 13F MARATHON PETE CORP COM Stock 56585A102 219,210 -320 -0.15 18,742 33.41 3.0811
2022-02-03 2021-12-31 13F MARATHON PETE CORP COM Stock 56585A102 219,530 -30 -0.01 14,048 3.51 2.3588
2021-11-02 2021-09-30 13F MARATHON PETE CORP COM Stock 56585A102 219,560 -150 -0.07 13,571 2.23 2.5417
2021-08-23 2021-06-30 13F MARATHON PETE CORP COM Stock 56585A102 219,710 2,635 1.21 13,275 14.33 2.4013
2021-05-04 2021-03-31 13F MARATHON PETE CORP COM Stock 56585A102 217,075 -1,820 -0.83 11,611 28.26 2.2685
2021-02-08 2020-12-31 13F MARATHON PETE CORP COM Stock 56585A102 218,895 -22,350 -9.26 9,053 27.90 1.9590
2020-10-28 2020-09-30 13F MARATHON PETE CORP COM Stock 56585A102 241,245 38,295 18.87 7,078 -6.70 1.7788
2020-08-04 2020-06-30 13F MARATHON PETE CORP COM Stock 56585A102 202,950 23,075 12.83 7,586 78.54 1.9985
2020-04-29 2020-03-31 13F MARATHON PETE CORP COM Stock 56585A102 179,875 52,450 41.16 4,249 -44.65 1.3653
2020-01-31 2019-12-31 13F MARATHON PETE CORP COM Stock 56585A102 127,425 4,055 3.29 7,677 2.43 1.8960
2019-10-30 2019-09-30 13F MARATHON PETE CORP COM Stock 56585A102 123,370 58,840 91.18 7,495 107.85 2.0521
2019-08-05 2019-06-30 13F MARATHON PETE CORP COM Stock 56585A102 64,530 20,635 47.01 3,606 37.27 1.0767
2019-05-07 2019-03-31 13F MARATHON PETE CORP COM Stock 56585A102 43,895 5,365 13.92 2,627 15.52 0.8286
2019-02-01 2018-12-31 13F MARATHON PETE CORP COM Stock 56585A102 38,530 29,925 347.76 2,274 230.52 0.8148
2018-10-31 2018-09-30 13F MARATHON PETE CORP COM Stock 56585A102 8,605 325 3.93 688 18.42 0.2166
2018-08-03 2018-06-30 13F Marathon Petroleum COM 56585A102 8,280 0 0.00 581 -3.97 0.2005
2018-05-04 2018-03-31 13F MARATHON PETE CORP COM Stock 56585A102 8,280 -210 -2.47 605 8.04 0.2204
2018-02-01 2017-12-31 13F Marathon Petroleum COM 56585A102 8,490 -420 -4.71 560 12.00 0.2030
2017-11-02 2017-09-30 13F Marathon Petroleum COM 56585A102 8,910 0 0.00 500 7.30 0.1913
2017-08-01 2017-06-30 13F Marathon Petroleum COM 56585A102 8,910 810 10.00 466 13.94 0.1866
2017-05-02 2017-03-31 13F Marathon Petroleum COM 56585A102 8,100 150 1.89 409 2.25 0.1684
2017-02-01 2016-12-31 13F Marathon Petroleum COM 56585A102 7,950 7,950 400 0.1683
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.