Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionAldebaran Financial Inc.
Latest Disclosed Ownership3,128 shares
Latest Disclosed Value $ 763,795
Aldebaran Financial Inc. ownership in MPC / Marathon Petroleum Corporation

On May 14, 2026 - Aldebaran Financial Inc. filed a 13F-HR form disclosing ownership of 3,128 shares of Marathon Petroleum Corporation (MX:MPC) valued at $763,795 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 3,128 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.00% 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)
2026-05-14 2026-03-31 13F MARATHON PETE COM 56585A102 3,128 0 0.00 764 49.02 0.7254
2026-01-23 2025-12-31 13F MARATHON PETE COM 56585A102 3,128 0 0.00 512 -14.95 0.4742
2025-11-19 2025-09-30 13F MARATHON PETE COM 56585A102 3,128 0 0.00 603 15.99 0.6031
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 3,128 0 0.00 520 14.07 0.5750
2025-05-08 2025-03-31 13F MARATHON PETE COM 56585A102 3,128 0 0.00 456 7.31 0.5569
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 3,128 0 0.00 424 -16.70 0.4957
2024-11-21 2024-09-30 13F MARATHON PETE COM 56585A102 3,128 0 0.00 510 -6.09 0.6007
2024-08-22 2024-06-30 13F MARATHON PETE COM 56585A102 3,128 0 0.00 543 -13.97 0.7111
2024-05-13 2024-03-31 13F MARATHON PETE COM 56585A102 3,128 -500 -13.78 630 17.10 0.8911
2024-02-01 2023-12-31 13F MARATHON PETE COM 56585A102 3,628 -300 -7.64 538 -9.43 0.7936
2023-11-06 2023-09-30 13F MARATHON PETE COM 56585A102 3,928 0 0.00 594 29.69 0.9275
2023-07-25 2023-06-30 13F MARATHON PETE COM 56585A102 3,928 -30 -0.76 458 -14.07 0.6220
2023-04-24 2023-03-31 13F MARATHON PETE COM 56585A102 3,958 -300 -7.05 534 7.68 0.6883
2023-03-06 2022-12-31 13F MARATHON PETE COM 56585A102 4,258 0 0.00 496 14.58 0.5325
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 4,258 0 0.00 432 24.50 0.4745
2022-08-01 2022-06-30 13F MARATHON PETE COM 56585A102 4,258 0 0.00 347 -4.67 0.3669
2022-04-18 2022-03-31 13F MARATHON PETE COM 56585A102 4,258 0 0.00 364 33.82 0.2828
2022-02-16 2021-12-31 13F MARATHON PETE COM 56585A102 4,258 0 0.00 272 3.42 0.2008
2021-10-21 2021-09-30 13F MARATHON PETE COM 56585A102 4,258 -1,191 -21.86 263 -21.02 0.2125
2021-07-16 2021-06-30 13F MARATHON PETE COM 56585A102 5,449 -49 -0.89 333 13.27 0.2736
2021-05-03 2021-03-31 13F MARATHON PETE COM 56585A102 5,498 -269 -4.66 294 23.01 0.2594
2021-02-05 2020-12-31 13F MARATHON PETE COM 56585A102 5,767 5,767 239 0.2224
2020-10-19 2020-09-30 13F MARATHON PETE COM 56585A102 0 -11,182 -100.00 0 -100.00
2020-07-20 2020-06-30 13F MARATHON PETE COM 56585A102 11,182 -9,832 -46.79 418 -15.73 0.4911
2020-04-24 2020-03-31 13F MARATHON PETE COM 56585A102 21,014 1,194 6.02 496 -58.46 0.4842
2020-02-10 2019-12-31 13F MARATHON PETE COM 56585A102 19,820 -8,990 -31.20 1,194 -31.38 0.9067
2019-10-21 2019-09-30 13F MARATHON PETE COM 56585A102 28,810 -40 -0.14 1,740 7.94 1.1614
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 28,850 436 1.53 1,612 -5.23 1.1136
2019-04-23 2019-03-31 13F MARATHON PETE COM 56585A102 28,414 -240 -0.84 1,701 0.59 1.1962
2019-02-14 2018-12-31 13F MARATHON PETE COM 56585A102 28,654 -643 -2.19 1,691 -27.83 1.2869
2018-11-08 2018-09-30 13F MARATHON PETE COM 56585A102 29,297 6 0.02 2,343 14.01 1.5205
2018-08-10 2018-06-30 13F MARATHON PETE COM 56585A102 29,291 -594 -1.99 2,055 -5.95 1.4106
2018-05-12 2018-03-31 13F/A-1 MARATHON PETE COM 56585A102 29,885 -1,106 -3.57 2,185 6.85 1.4654
2018-04-24 2018-03-31 13F MARATHON PETE COM 56585A102 29,885 -1,106 2,185
2018-03-02 2017-12-31 13F MARATHON PETE COM 56585A102 30,991 -883 -2.77 2,045 14.44 1.3589
2017-11-17 2017-09-30 13F MARATHON PETE COM 56585A102 31,874 -389 -1.21 1,787 5.86 1.2328
2017-08-28 2017-06-30 13F MARATHON PETE COM 56585A102 32,263 -954 -2.87 1,688 0.54 1.2309
2017-06-16 2017-03-31 13F MARATHON PETE COM 56585A102 33,217 -190 -0.57 1,679 -0.18 1.2777
2017-03-23 2016-12-31 13F MARATHON PETE COM 56585A102 33,407 52 0.16 1,682 24.22 1.3316
2016-12-16 2016-09-30 13F MARATHON PETE COM 56585A102 33,355 -412 -1.22 1,354 10.08 1.0734
2016-08-25 2016-06-30 13F MARATHON PETE COM 56585A102 33,767 2,622 8.42 1,230 6.22 0.9885
2016-05-16 2016-03-31 13F MARATHON PETE COM 56585A102 31,145 -98 -0.31 1,158 -27.67 1.0101
2016-02-17 2015-12-31 13F MARATHON PETE COM 56585A102 31,243 809 2.66 1,601 13.55 1.4827
2015-11-13 2015-09-30 13F MARATHON PETE COM 56585A102 30,434 -991 -3.15 1,410 -14.23 1.3322
2015-08-17 2015-06-30 13F/A-1 MARATHON PETE COM 56585A102 31,425 15,716 100.04 1,644 2.24 1.3868
2015-08-14 2015-06-30 13F MARATHON PETE COM 56585A102 31,425 1,644
2015-06-02 2015-03-31 13F MARATHON PETE COM 56585A102 15,709 128 0.82 1,608 14.37 1.3795
2015-02-13 2014-12-31 13F MARATHON PETE COM 56585A102 15,581 -27,190 -63.57 1,406 -40.65 1.2354
2014-11-14 2014-09-30 13F MARATHON PETE COM 56585A102 42,771 -2,941 -6.43 2,369 -3.15 2.1183
2014-08-15 2014-06-30 13F MARATHON PETE COM 56585A102 45,712 29,817 187.59 2,446 76.86 1.9255
2014-05-16 2014-03-31 13F/A-1 MARATHON PETE COM 56585A102 15,895 -397 -2.44 1,383 -7.43 1.2081
2014-05-15 2014-03-31 13F MARATHON PETE COM 56585A102 16,000 1,383
2014-02-13 2013-12-31 13F MARATHON PETE COM 56585A102 16,292 16,292 1,494 1.4205
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.