Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionWhite Pine Investment CO
Latest Disclosed Ownership47,033 shares
Latest Disclosed Value $ 11,485
White Pine Investment CO reports 4.33% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 20, 2026 - White Pine Investment CO filed a 13F-HR form disclosing ownership of 47,033 shares of Marathon Petroleum Corporation (MX:MPC) valued at $11,485 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 49,161 shares of Marathon Petroleum Corporation. This represents a change in shares of -4.33% 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)
2026-04-20 2026-03-31 13F Marathon Petroleum COM 56585A102 47,033 -2,128 -4.33 11 57.14 2.6685
2026-01-28 2025-12-31 13F Marathon Petroleum COM 56585A102 49,161 -2,522 -4.88 8 -22.22 1.8838
2025-10-14 2025-09-30 13F Marathon Petroleum COM 56585A102 51,683 -1,042 -1.98 10 12.50 2.3632
2025-07-17 2025-06-30 13F Marathon Petroleum COM 56585A102 52,725 -1,491 -2.75 9 14.29 2.1861
2025-04-23 2025-03-31 13F Marathon Petroleum COM 56585A102 54,216 208 0.39 8 0.00 2.1266
2025-01-17 2024-12-31 13F Marathon Petroleum COM 56585A102 54,008 280 0.52 8 -12.50 2.0350
2024-10-29 2024-09-30 13F Marathon Petroleum COM 56585A102 53,728 -541 -1.00 9 -11.11 2.4016
2024-07-24 2024-06-30 13F Marathon Petroleum COM 56585A102 54,269 -1,610 -2.88 9 -18.18 2.7665
2024-04-26 2024-03-31 13F Marathon Petroleum COM 56585A102 55,879 -1,589 -2.77 11 37.50 3.3253
2024-01-26 2023-12-31 13F Marathon Petroleum COM 56585A102 57,468 -5,545 -8.80 9 -11.11 2.7516
2023-10-27 2023-09-30 13F Marathon Petroleum COM 56585A102 63,013 -2,354 -3.60 10 28.57 3.3520
2023-08-04 2023-06-30 13F Marathon Petroleum COM 56585A102 65,367 -535 -0.81 8 -12.50 2.6289
2023-04-14 2023-03-31 13F Marathon Petroleum COM 56585A102 65,902 -3,091 -4.48 9 0.00 3.1915
2023-02-03 2022-12-31 13F Marathon Petroleum COM 56585A102 68,993 -4,450 -6.06 8 -99.89 3.0541
2022-10-28 2022-09-30 13F Marathon Petroleum COM 56585A102 73,443 -6,310 -7.91 7,295 11.27 3.0216
2022-07-29 2022-06-30 13F Marathon Petroleum COM 56585A102 79,753 -5,310 -6.24 6,556 -9.86 2.5908
2022-05-06 2022-03-31 13F Marathon Petroleum COM 56585A102 85,063 -3,110 -3.53 7,273 28.91 2.4702
2022-01-28 2021-12-31 13F Marathon Petroleum COM 56585A102 88,173 -1,025 -1.15 5,642 2.34 1.8773
2021-11-05 2021-09-30 13F Marathon Petroleum COM 56585A102 89,198 1,104 1.25 5,513 3.57 1.9274
2021-08-06 2021-06-30 13F Marathon Petroleum COM 56585A102 88,094 -1,547 -1.73 5,323 11.01 1.8337
2021-05-03 2021-03-31 13F Marathon Petroleum COM 56585A102 89,641 -579 -0.64 4,795 28.52 1.7805
2021-01-22 2020-12-31 13F Marathon Petroleum COM 56585A102 90,220 12,525 16.12 3,731 63.64 1.5110
2020-11-02 2020-09-30 13F Marathon Petroleum COM 56585A102 77,695 11,125 16.71 2,280 -8.36 1.0493
2020-08-13 2020-06-30 13F Marathon Petroleum COM 56585A102 66,570 -5,270 -7.34 2,488 46.61 1.2283
2020-04-23 2020-03-31 13F Marathon Petroleum COM 56585A102 71,840 -2,925 -3.91 1,697 -62.33 0.9725
2020-01-27 2019-12-31 13F Marathon Petroleum COM 56585A102 74,765 -65 -0.09 4,505 -0.90 1.8462
2019-11-12 2019-09-30 13F Marathon Petroleum COM 56585A102 74,830 3,440 4.82 4,546 13.96 2.0643
2019-08-01 2019-06-30 13F Marathon Petroleum COM 56585A102 71,390 2,525 3.67 3,989 -3.23 1.8839
2019-04-23 2019-03-31 13F Marathon Petroleum COM 56585A102 68,865 660 0.97 4,122 2.41 2.0629
2019-02-06 2018-12-31 13F Marathon Petroleum COM 56585A102 68,205 -1,490 -2.14 4,025 -27.79 2.1527
2018-10-18 2018-09-30 13F Marathon Petroleum COM 56585A102 69,695 -1,100 -1.55 5,574 12.22 2.6698
2018-08-06 2018-06-30 13F Marathon Petroleum COM 56585A102 70,795 -665 -0.93 4,967 -4.92 2.5744
2018-05-07 2018-03-31 13F Marathon Pete COM 56585A102 71,460 -945 -1.31 5,224 9.36 2.5524
2018-01-24 2017-12-31 13F Marathon Pete COM 56585A102 72,405 -1,915 -2.58 4,777 14.61 2.3582
2017-10-31 2017-09-30 13F Marathon Pete COM 56585A102 74,320 -680 -0.91 4,168 6.19 2.2162
2017-07-18 2017-06-30 13F Marathon Pete COM 56585A102 75,000 450 0.60 3,925 4.17 2.0917
2017-05-08 2017-03-31 13F Marathon Pete COM 56585A102 74,550 0 0.00 3,768 0.37 2.0311
2017-02-06 2016-12-31 13F Marathon Pete COM 56585A102 74,550 -1,190 -1.57 3,754 22.12 2.0328
2016-11-04 2016-09-30 13F Marathon Pete COM 56585A102 75,740 400 0.53 3,074 7.48 1.8030
2016-08-05 2016-06-30 13F Marathon Pete COM 56585A102 75,340 310 0.41 2,860 2.51 1.7145
2016-05-09 2016-03-31 13F Marathon Pete COM 56585A102 75,030 1,580 2.15 2,790 -26.73 1.6982
2016-02-09 2015-12-31 13F Marathon Pete COM 56585A102 73,450 -334 -0.45 3,808 11.41 2.3461
2015-11-06 2015-09-30 13F Marathon Pete COM 56585A102 73,784 -862 -1.15 3,418 -12.47 2.1924
2015-08-03 2015-06-30 13F Marathon Pete COM 56585A102 74,646 37,903 103.16 3,905 3.80 2.2745
2015-05-04 2015-03-31 13F Marathon Pete COM 56585A102 36,743 36,743 0.00 3,762 2.1498
2015-02-04 2014-12-31 13F Marathon Pete COM 56585A102 0 -56,495 -100.00 0 -100.00
2014-11-06 2014-09-30 13F Marathon Pete COM 56585A102 56,495 -750 -1.31 4,783 7.03 2.8879
2014-08-06 2014-06-30 13F Marathon Pete COM 56585A102 57,245 -1,600 -2.72 4,469 -12.75 2.6972
2014-05-02 2014-03-31 13F Marathon Pete COM 56585A102 58,845 -2,425 -3.96 5,122 -8.86 3.2839
2014-01-27 2013-12-31 13F Marathon Pete COM 56585A102 61,270 850 1.41 5,620 44.62 3.8413
2013-10-24 2013-09-30 13F Marathon Pete COM 56585A102 60,420 11,820 24.32 3,886 12.54 2.9507
2013-07-18 2013-06-30 13F Marathon Pete COM 56585A102 48,600 48,600 3,453 2.7456
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.