Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionMAI Capital Management
Latest Disclosed Ownership31,223 shares
Latest Disclosed Value $ 7,623,925
MAI Capital Management reports 0.77% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - MAI Capital Management filed a 13F-HR form disclosing ownership of 31,223 shares of Marathon Petroleum Corporation (MX:MPC) valued at $7,623,925 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 30,984 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.77% 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 PETE COM 56585A102 31,223 239 0.77 7,624 51.31 0.0430
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 30,984 7,843 33.89 5,039 12.96 0.0290
2025-11-10 2025-09-30 13F MARATHON PETE COM 56585A102 23,141 2,870 14.16 4,460 32.46 0.0278
2025-08-12 2025-06-30 13F MARATHON PETE COM 56585A102 20,271 3,698 22.31 3,367 39.48 0.0233
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 16,573 252 1.54 2,414 6.06 0.0182
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 16,321 -550 -3.26 2,277 -17.18 0.0169
2024-11-07 2024-09-30 13F Marathon Petroleum CS 56585A102 16,871 -10,375 -38.08 2,749 -41.85 0.0262
2024-08-12 2024-06-30 13F Marathon Petroleum CS 56585A102 27,246 -486 -1.75 4,727 -15.43 0.0463
2024-05-08 2024-03-31 13F Marathon Petroleum CS 56585A102 27,732 1,831 7.07 5,588 45.45 0.0579
2024-02-09 2023-12-31 13F Marathon Petroleum CS 56585A102 25,901 548 2.16 3,843 0.16 0.0505
2023-11-14 2023-09-30 13F Marathon Petroleum CS 56585A102 25,353 2,128 9.16 3,837 41.65 0.0571
2023-08-02 2023-06-30 13F Marathon Petroleum CS 56585A102 23,225 -8,738 -27.34 2,708 -37.15 0.0398
2023-05-10 2023-03-31 13F Marathon Petroleum CS 56585A102 31,963 10,480 48.78 4,310 72.36 0.0679
2023-02-09 2022-12-31 13F Marathon Petroleum CS 56585A102 21,483 3,061 16.62 2,500 36.61 0.0420
2022-11-15 2022-09-30 13F Marathon Petroleum CS 56585A102 18,422 6,531 54.92 1,830 87.12 0.0344
2022-07-19 2022-06-30 13F Marathon Petroleum CS 56585A102 11,891 -287 -2.36 978 -6.05 0.0187
2022-05-10 2022-03-31 13F Marathon Petroleum CS 56585A102 12,178 -454 -3.59 1,041 28.84 0.0175
2022-02-11 2021-12-31 13F Marathon Petroleum CS 56585A102 12,632 1,024 8.82 808 12.53 0.0130
2021-11-12 2021-09-30 13F Marathon Petroleum CS 56585A102 11,608 -247 -2.08 718 0.28 0.0138
2021-07-19 2021-06-30 13F Marathon Petroleum CS 56585A102 11,855 -9,217 -43.74 716 -36.47 0.0142
2021-05-10 2021-03-31 13F Marathon Petroleum CS 56585A102 21,072 -616 -2.84 1,127 25.64 0.0252
2021-02-16 2020-12-31 13F Marathon Petroleum CS 56585A102 21,688 34 0.16 897 41.26 0.0224
2020-10-26 2020-09-30 13F Marathon Petroleum CS 56585A102 21,654 -4,416 -16.94 635 -34.80 0.0184
2020-07-27 2020-06-30 13F Marathon Petroleum CS 56585A102 26,070 -21,632 -45.35 974 -13.58 0.0306
2020-04-16 2020-03-31 13F Marathon Petroleum CS 56585A102 47,702 -62,421 -56.68 1,127 -83.01 0.0460
2020-02-03 2019-12-31 13F Marathon Petroleum CS 56585A102 110,123 1,625 1.50 6,635 0.67 0.2150
2019-10-29 2019-09-30 13F Marathon Petroleum CS 56585A102 108,498 -11,651 -9.70 6,591 -1.83 0.2937
2019-08-15 2019-06-30 13F Marathon Petroleum CS 56585A102 120,149 3,749 3.22 6,714 -3.63 0.3034
2019-04-29 2019-03-31 13F Marathon Petroleum CS 56585A102 116,400 11,509 10.97 6,967 12.55 0.3568
2019-01-30 2018-12-31 13F Marathon Petroleum CS 56585A102 104,891 46 0.04 6,190 -26.17 0.3608
2018-10-12 2018-09-30 13F Marathon Petroleum CS 56585A102 104,845 -3,156 -2.92 8,384 10.65 0.4283
2018-08-16 2018-06-30 13F Marathon Petroleum CS 56585A102 108,001 604 0.56 7,577 -3.50 0.4087
2018-04-17 2018-03-31 13F Marathon Petroleum CS 56585A102 107,397 -534 -0.49 7,852 10.27 0.4458
2018-01-30 2017-12-31 13F Marathon Petroleum CS 56585A102 107,931 -11,412 -9.56 7,121 6.39 0.4046
2017-10-12 2017-09-30 13F Marathon Petroleum CS 56585A102 119,343 1,894 1.61 6,693 8.90 0.4063
2017-08-07 2017-06-30 13F Marathon Petroleum CS 56585A102 117,449 4,599 4.08 6,146 7.77 0.3959
2017-05-11 2017-03-31 13F Marathon Petroleum CS 56585A102 112,850 10,745 10.52 5,703 10.93 0.3837
2017-01-31 2016-12-31 13F Marathon Petroleum CS 56585A102 102,105 102,105 0.00 5,141 0.3738
2016-04-08 2016-03-31 13F Marathon Petroleum CS 56585A102 0 -7,241 -100.00 0 -100.00
2016-01-27 2015-12-31 13F Marathon Petroleum CS 56585A102 7,241 1,032 16.62 375 30.21 0.0286
2015-10-28 2015-09-30 13F Marathon Petroleum CS 56585A102 6,209 1,589 34.39 288 19.01 0.0218
2015-07-09 2015-06-30 13F Marathon Petroleum CS 56585A102 4,620 2,311 100.09 242 2.54 0.0159
2015-04-30 2015-03-31 13F Marathon Petroleum CS 56585A102 2,309 2,309 236 0.0158
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.