Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionSegment Wealth Management, LLC
Latest Disclosed Ownership90,273 shares
Latest Disclosed Value $ 22,042,861
Segment Wealth Management, LLC reports 1,710.53% increase in ownership of MPC / Marathon Petroleum Corporation

On April 20, 2026 - Segment Wealth Management, LLC filed a 13F-HR form disclosing ownership of 90,273 shares of Marathon Petroleum Corporation (US:MPC) valued at $22,042,861 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 4,986 shares of Marathon Petroleum Corporation. This represents a change in shares of 1,710.53% during the quarter. The current value of the position is $24,121,848 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)
2026-04-20 2026-03-31 13F MARATHON PETE COM 56585A102 90,273 85,287 1,710.53 22,043 2,621.23 1.2933
2026-01-29 2025-12-31 13F MARATHON PETE COM 56585A102 4,986 0 0.00 811 -15.71 0.0470
2025-10-20 2025-09-30 13F MARATHON PETE COM 56585A102 4,986 -46 -0.91 961 15.09 0.0576
2025-07-21 2025-06-30 13F MARATHON PETE COM 56585A102 5,032 -711 -12.38 836 -0.12 0.0531
2025-04-22 2025-03-31 13F MARATHON PETE COM 56585A102 5,743 135 2.41 837 6.91 0.0566
2025-01-17 2024-12-31 13F MARATHON PETE COM 56585A102 5,608 115 2.09 782 -12.53 0.0533
2024-10-22 2024-09-30 13F MARATHON PETE COM 56585A102 5,493 -955 -14.81 895 -20.04 0.0615
2024-07-23 2024-06-30 13F MARATHON PETE COM 56585A102 6,448 -635 -8.97 1,119 -21.65 0.0825
2024-04-24 2024-03-31 13F MARATHON PETE COM 56585A102 7,083 132 1.90 1,427 38.41 0.1084
2024-01-26 2023-12-31 13F MARATHON PETE COM 56585A102 6,951 0 0.00 1,031 -1.90 0.0911
2023-10-25 2023-09-30 13F MARATHON PETE COM 56585A102 6,951 2,235 47.39 1,052 91.44 0.1069
2023-08-22 2023-06-30 13F/A-1 MARATHON PETE COM 56585A102 4,716 560 13.47 550 -1.96 0.0565
2023-07-21 2023-06-30 13F MARATHON PETE COM 56585A102 4,716 560 550 0.0571
2023-04-20 2023-03-31 13F MARATHON PETE COM 56585A102 4,156 0 0.00 560 15.94 0.0634
2023-01-13 2022-12-31 13F MARATHON PETE COM 56585A102 4,156 0 0.00 484 16.95 0.0560
2022-10-24 2022-09-30 13F MARATHON PETE COM 56585A102 4,156 -126,529 -96.82 413 -96.16 0.0516
2022-07-20 2022-06-30 13F MARATHON PETE COM 56585A102 130,685 5,583 4.46 10,744 0.45 1.3637
2022-04-25 2022-03-31 13F MARATHON PETE COM 56585A102 125,102 -36,268 -22.48 10,696 3.58 1.1022
2022-01-24 2021-12-31 13F MARATHON PETE COM 56585A102 161,370 526 0.33 10,326 3.86 1.0831
2021-10-19 2021-09-30 13F MARATHON PETE COM 56585A102 160,844 1,413 0.89 9,942 3.21 1.1800
2021-07-20 2021-06-30 13F MARATHON PETE COM 56585A102 159,431 3,202 2.05 9,633 15.27 1.1432
2021-05-10 2021-03-31 13F MARATHON PETE COM 56585A102 156,229 2,735 1.78 8,357 31.63 1.1083
2021-01-27 2020-12-31 13F MARATHON PETE COM 56585A102 153,494 153,494 6,349 0.9166
2020-04-24 2020-03-31 13F MARATHON PETE COM 56585A102 0 -13,896 -100.00 0 -100.00
2020-01-23 2019-12-31 13F MARATHON PETE COM 56585A102 13,896 1,449 11.64 837 10.71 0.1413
2019-10-22 2019-09-30 13F MARATHON PETE COM 56585A102 12,447 -440 -3.41 756 5.00 0.1479
2019-07-29 2019-06-30 13F MARATHON PETE COM 56585A102 12,887 -29,501 -69.60 720 -71.62 0.1465
2019-04-30 2019-03-31 13F MARATHON PETE COM 56585A102 42,388 4,908 13.09 2,537 14.69 0.5374
2019-01-31 2018-12-31 13F MARATHON PETE COM 56585A102 37,480 -2,354 -5.91 2,212 -30.57 0.5580
2018-11-07 2018-09-30 13F MARATHON PETE COM 56585A102 39,834 31,113 356.76 3,186 420.59 0.6941
2018-07-17 2018-06-30 13F MARATHON PETE COM 56585A102 8,721 -90 -1.02 612 -4.97 0.1444
2018-04-27 2018-03-31 13F MARATHON PETE COM 56585A102 8,811 -55 -0.62 644 10.09 0.1601
2018-01-22 2017-12-31 13F MARATHON PETE COM 56585A102 8,866 2,411 37.35 585 61.60 0.1414
2017-10-26 2017-09-30 13F MARATHON PETE COM 56585A102 6,455 9 0.14 362 7.10 0.0960
2017-08-11 2017-06-30 13F MARATHON PETE COM 56585A102 6,446 836 14.90 338 19.86 0.0931
2017-02-06 2016-12-31 13F MARATHON PETE COM 56585A102 5,610 0 0.00 282 23.68 0.1035
2016-10-26 2016-09-30 13F MARATHON PETE COM 56585A102 5,610 -200 -3.44 228 3.17 0.0897
2016-08-09 2016-06-30 13F MARATHON PETE COM 56585A102 5,810 -150 -2.52 221 -0.45 0.0912
2016-05-11 2016-03-31 13F MARATHON PETE COM 56585A102 5,960 0 0.00 222 -28.16 0.0829
2016-02-08 2015-12-31 13F MARATHON PETE COM 56585A102 5,960 -2,200 -26.96 309 -18.25 0.1171
2015-10-23 2015-09-30 13F MARATHON PETE COM 56585A102 8,160 0 0.00 378 -11.48 0.1445
2015-07-21 2015-06-30 13F MARATHON PETE COM 56585A102 8,160 4,080 100.00 427 2.15 0.1483
2015-04-28 2015-03-31 13F MARATHON PETE COM 56585A102 4,080 1,728 73.47 418 103.90 0.1396
2014-04-25 2014-03-31 13F MARATHON PETE COM 56585A102 2,352 -150 -6.00 205 -10.87 0.0953
2014-01-17 2013-12-31 13F MARATHON PETE COM 56585A102 2,502 -1,791 -41.72 230 -24.59 0.1134
2013-07-31 2013-06-30 13F MARATHON PETE COM 56585A102 4,293 4,293 305 0.1825
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.