Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionUbs Asset Management Americas Inc
Latest Disclosed Ownership1,292,803 shares
Latest Disclosed Value $ 315,676,637
Ubs Asset Management Americas Inc reports 0.04% increase in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - Ubs Asset Management Americas Inc filed a 13F-HR form disclosing ownership of 1,292,803 shares of Marathon Petroleum Corporation (MX:MPC) valued at $315,676,637 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,292,232 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.04% 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)
2026-05-13 2026-03-31 13F MARATHON PETE COM 56585A102 1,292,803 571 0.04 315,677 50.21 0.0098
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 1,292,232 -130,782 -9.19 210,156 -23.38 0.0444
2025-11-14 2025-09-30 13F MARATHON PETE COM 56585A102 1,423,014 -689,912 -32.65 274,272 -21.86 0.0596
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 2,112,926 353,582 20.10 350,978 36.93 0.0710
2025-05-19 2025-03-31 13F MARATHON PETE COM 56585A102 1,759,344 129,610 7.95 256,319 12.74 0.0656
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 1,629,734 -116,688 -6.68 227,348 -20.09 0.0530
2024-11-14 2024-09-30 13F MARATHON PETE COM 56585A102 1,746,422 -123,293 -6.59 284,510 -12.29 0.0731
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 1,869,715 536,874 40.28 324,358 20.77 0.0931
2024-05-15 2024-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,332,841 -319,451 -19.33 268,567 9.56 0.0955
2024-02-14 2023-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,652,292 157,270 10.52 245,134 8.34 0.0964
2023-11-13 2023-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,495,022 -150,997 -9.17 226,257 1.95 0.1014
2023-08-11 2023-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,646,019 0 0.00 221,933 0.00 0.1075
2023-05-15 2023-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,646,019 -912,981 -35.68 221,933 -25.49 0.1075
2023-02-14 2022-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,559,000 319,158 14.25 297,842 33.87 0.1562
2022-11-14 2022-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,239,842 22,484 1.01 222,484 22.05 0.1248
2022-08-12 2022-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,217,358 131,971 6.33 182,289 2.24 0.0955
2022-05-16 2022-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,085,387 -174,475 -7.72 178,301 23.30 0.0764
2022-02-14 2021-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,259,862 -203,623 -8.27 144,609 -5.03 0.0554
2021-11-15 2021-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,463,485 10,488 0.43 152,268 2.74 0.0631
2021-08-16 2021-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,452,997 -1,560,048 -38.87 148,210 -30.95 0.0634
2021-05-14 2021-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 4,013,045 -52,263 -1.29 214,658 27.66 0.0949
2021-03-01 2020-12-31 13F/A-1 MARATHON PETROLEUM EQUITY US CM 56585A102 4,065,308 821,181 25.31 168,141 76.65 0.0788
2021-02-17 2020-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 3,244,127 0 95,183 8.9773
2020-11-13 2020-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 3,244,127 1,039,975 47.18 95,183 15.52 0.0511
2020-08-14 2020-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,204,152 -290,036 -11.63 82,391 39.85 0.0503
2020-05-15 2020-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,494,188 362,847 17.02 58,913 -54.12 0.0424
2020-02-14 2019-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,131,341 -153,938 -6.74 128,413 -7.50 0.0786
2019-11-14 2019-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,285,279 124,451 5.76 138,831 14.98 0.0935
2019-08-15 2019-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,160,828 -165,039 -7.10 120,747 -13.26 0.0861
2019-05-14 2019-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,325,867 -534,239 -18.68 139,203 -17.52 0.1032
2019-02-13 2018-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,860,106 593,019 26.16 168,775 -6.91 0.1455
2018-11-13 2018-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,267,087 -2,771 -0.12 181,299 13.84 0.1348
2018-08-14 2018-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,269,858 -285,257 -11.16 159,253 -14.75 0.1220
2018-05-14 2018-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,555,115 290,766 12.84 186,804 25.04 0.1474
2018-02-09 2017-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,264,349 -57,909 -2.49 149,402 14.72 0.1266
2017-11-13 2017-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,322,258 -7,929 -0.34 130,232 6.80 0.1186
2017-08-11 2017-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,330,187 447,871 23.79 121,939 28.18 0.1180
2017-05-04 2017-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,882,316 193,280 11.44 95,132 11.86 0.0970
2017-03-09 2016-12-31 13F/A-1 MARATHON PETE COM 56585A102 1,689,036 -5,400 -0.32 85,042 23.65 0.0954
2017-02-14 2016-12-31 13F MARATHON PETE COM 56585A102 1,689,036 85,042
2016-11-04 2016-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,694,436 -67,177 -3.81 68,777 2.85 0.0740
2016-11-29 2016-06-30 13F/A-1 MARATHON PETROLEUM EQUITY US CM 56585A102 1,761,613 -36,151 -2.01 66,870 0.04 0.0756
2016-08-09 2016-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,761,613 66,870
2016-05-12 2016-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,797,764 -32,564 -1.78 66,841 -29.56 0.0775
2016-02-12 2015-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,830,328 -358,716 -16.39 94,884 -6.44 0.1082
2015-10-29 2015-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,189,044 -284,025 -11.48 101,419 -21.60 0.1119
2015-08-12 2015-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 2,473,069 1,243,383 101.11 129,366 2.75 0.1239
2015-05-04 2015-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,229,686 1,229,686 0.00 125,906 0.1214
2015-02-02 2014-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 0 -1,371,280 -100.00 0 -100.00
2014-10-28 2014-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,371,280 45,911 3.46 116,106 12.21 0.1151
2014-08-13 2014-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,325,369 -96,021 -6.76 103,470 -16.37 0.1045
2014-05-23 2014-03-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,421,390 156,068 12.33 123,718 6.59 0.1320
2014-01-31 2013-12-31 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,265,322 -127,780 -9.17 116,069 29.54 0.1327
2013-11-08 2013-09-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,393,102 88,489 6.78 89,604 -3.35 0.1107
2013-08-15 2013-06-30 13F/A-1 MARATHON PETROLEUM EQUITY US CM 56585A102 1,304,613 1,304,613 92,706 0.1196
2013-08-13 2013-06-30 13F MARATHON PETROLEUM EQUITY US CM 56585A102 1,301,687 92,498 0.1214
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.