Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionCarret Asset Management, Llc
Latest Disclosed Ownership7,724 shares
Latest Disclosed Value $ 1,886,046
Carret Asset Management, Llc reports 10.44% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - Carret Asset Management, Llc filed a 13F-HR form disclosing ownership of 7,724 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,886,046 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 8,624 shares of Marathon Petroleum Corporation. This represents a change in shares of -10.44% 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)
2026-05-15 2026-03-31 13F MARATHON PETROLEUM COM 56585A102 7,724 -900 -10.44 1,886 34.52 0.1846
2026-02-17 2025-12-31 13F MARATHON PETROLEUM COM 56585A102 8,624 -150 -1.71 1,403 -17.09 0.1331
2025-11-13 2025-09-30 13F MARATHON PETROLEUM COM 56585A102 8,774 -50 -0.57 1,691 15.43 0.1645
2025-08-04 2025-06-30 13F MARATHON PETROLEUM COM 56585A102 8,824 -166 -1.85 1,466 11.92 0.1566
2025-04-22 2025-03-31 13F MARATHON PETROLEUM COM 56585A102 8,990 0 0.00 1,310 4.39 0.1480
2025-02-10 2024-12-31 13F MARATHON PETROLEUM COM 56585A102 8,990 0 0.00 1,254 -14.34 0.1374
2024-10-24 2024-09-30 13F MARATHON PETROLEUM COM 56585A102 8,990 0 0.00 1,465 -6.09 0.1589
2024-08-01 2024-06-30 13F MARATHON PETROLEUM COM 56585A102 8,990 0 0.00 1,560 -13.91 0.1820
2024-04-19 2024-03-31 13F MARATHON PETROLEUM COM 56585A102 8,990 0 0.00 1,811 35.86 0.2133
2024-02-02 2023-12-31 13F MARATHON PETROLEUM COM 56585A102 8,990 -166 -1.81 1,334 -3.75 0.1699
2023-10-12 2023-09-30 13F MARATHON PETROLEUM COM 56585A102 9,156 0 0.00 1,386 29.80 0.1931
2023-07-25 2023-06-30 13F MARATHON PETROLEUM COM 56585A102 9,156 -667 -6.79 1,068 -19.41 0.1415
2023-05-11 2023-03-31 13F MARATHON PETROLEUM COM 56585A102 9,823 -1,533 -13.50 1,324 132,300.00 0.1839
2023-01-10 2022-12-31 13F MARATHON PETROLEUM COM 56585A102 11,356 -200 -1.73 1 -99.91 0.1827
2022-11-14 2022-09-30 13F/A-1 MARATHON PETROLEUM COM 56585A102 11,556 0 0.00 1,148 20.84 0.1713
2022-10-11 2022-09-30 13F MARATHON PETROLEUM COM 56585A102 11,556 0 1,148 0.1713
2022-08-04 2022-06-30 13F MARATHON PETROLEUM COM 56585A102 11,556 -4,235 -26.82 950 -29.63 0.1318
2022-04-13 2022-03-31 13F MARATHON PETROLEUM COM 56585A102 15,791 -700 -4.24 1,350 27.96 0.1545
2022-01-10 2021-12-31 13F MARATHON PETROLEUM COM 56585A102 16,491 0 0.00 1,055 3.53 0.1168
2021-10-27 2021-09-30 13F MARATHON PETROLEUM COM 56585A102 16,491 -381 -2.26 1,019 0.00 0.1216
2021-07-14 2021-06-30 13F MARATHON PETROLEUM COM 56585A102 16,872 0 0.00 1,019 12.97 0.1193
2021-07-14 2021-03-31 13F MARATHON PETROLEUM COM 56585A102 16,872 -366 -2.12 902 26.51 0.1119
2021-03-16 2020-12-31 13F MARATHON PETROLEUM COM 56585A102 17,238 -1,048 -5.73 713 32.77 0.0960
2020-11-16 2020-09-30 13F MARATHON PETROLEUM COM 56585A102 18,286 -247 -1.33 537 -22.51 0.0812
2020-08-12 2020-06-30 13F MARATHON PETROLEUM COM 56585A102 18,533 -107 -0.57 693 57.50 0.1124
2020-05-18 2020-03-31 13F MARATHON PETROLEUM COM 56585A102 18,640 0 0.00 440 -60.82 0.0845
2020-02-13 2019-12-31 13F MARATHON PETROLEUM COM 56585A102 18,640 0 0.00 1,123 -0.80 0.1638
2019-11-13 2019-09-30 13F MARATHON PETROLEUM COM 56585A102 18,640 -169 -0.90 1,132 7.71 0.1796
2019-08-12 2019-06-30 13F MARATHON PETROLEUM COM 56585A102 18,809 100 0.53 1,051 -6.16 0.1670
2019-05-15 2019-03-31 13F MARATHON PETROLEUM COM 56585A102 18,709 31 0.17 1,120 1.63 0.1827
2019-02-13 2018-12-31 13F MARATHON PETROLEUM COM 56585A102 18,678 0 0.00 1,102 -26.24 0.1985
2018-11-13 2018-09-30 13F MARATHON PETROLEUM COM 56585A102 18,678 -254 -1.34 1,494 12.50 0.2300
2018-08-08 2018-06-30 13F MARATHON PETROLEUM COM 56585A102 18,932 -1,950 -9.34 1,328 -13.03 0.2170
2018-05-14 2018-03-31 13F MARATHON PETROLEUM COM 56585A102 20,882 -950 -4.35 1,527 6.04 0.2512
2018-02-13 2017-12-31 13F MARATHON PETROLEUM COM 56585A102 21,832 -45 -0.21 1,440 17.36 0.2240
2017-11-14 2017-09-30 13F MARATHON PETROLEUM COM 56585A102 21,877 0 0.00 1,227 7.16 0.1981
2017-08-15 2017-06-30 13F MARATHON PETROLEUM COM 56585A102 21,877 0 0.00 1,145 3.53 0.1922
2017-05-08 2017-03-31 13F MARATHON PETROLEUM COM 56585A102 21,877 0 0.00 1,106 0.36 0.1985
2017-02-16 2016-12-31 13F MARATHON PETROLEUM COM 56585A102 21,877 0 0.00 1,102 24.10 0.2088
2016-11-10 2016-09-30 13F MARATHON PETROLEUM COM 56585A102 21,877 0 0.00 888 6.99 0.1661
2016-08-10 2016-06-30 13F MARATHON PETROLEUM COM 56585A102 21,877 0 0.00 830 2.09 0.1604
2016-05-17 2016-03-31 13F MARATHON PETROLEUM COM 56585A102 21,877 -7,525 -25.59 813 -46.65 0.1726
2016-02-05 2015-12-31 13F MARATHON PETROLEUM COM 56585A102 29,402 -428 -1.43 1,524 10.27 0.3252
2015-11-16 2015-09-30 13F MARATHON PETROLEUM COM 56585A102 29,830 -400 -1.32 1,382 -12.59 0.3015
2015-08-12 2015-06-30 13F MARATHON PETROLEUM COM 56585A102 30,230 15,144 100.38 1,581 2.33 0.3141
2015-05-11 2015-03-31 13F MARATHON PETROLEUM COM 56585A102 15,086 -100 -0.66 1,545 12.69 0.3002
2015-02-19 2014-12-31 13F MARATHON PETROLEUM COM 56585A102 15,186 -25 -0.16 1,371 6.44 0.2594
2014-11-12 2014-09-30 13F MARATHON PETROLEUM COM 56585A102 15,211 -450 -2.87 1,288 5.31 0.2500
2014-08-14 2014-06-30 13F MARATHON PETROLEUM COM 56585A102 15,661 -1,025 -6.14 1,223 -15.77 0.2341
2014-05-15 2014-03-31 13F MARATHON PETROLEUM COM 56585A102 16,686 -400 -2.34 1,452 -7.34 0.2899
2014-02-14 2013-12-31 13F MARATHON PETROLEUM COM 56585A102 17,086 -325 -1.87 1,567 39.91 0.3202
2013-11-14 2013-09-30 13F MARATHON PETROLEUM COM 56585A102 17,411 -112 -0.64 1,120 -10.04 0.2485
2013-08-15 2013-06-30 13F MARATHON PETROLEUM COM 56585A102 17,523 17,523 1,245 0.2586
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.