Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionAspiriant, Llc
Latest Disclosed Ownership5,917 shares
Latest Disclosed Value $ 1,444,813
Aspiriant, Llc reports 1.50% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 12, 2026 - Aspiriant, Llc filed a 13F-HR form disclosing ownership of 5,917 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,444,813 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 6,007 shares of Marathon Petroleum Corporation. This represents a change in shares of -1.50% 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)
2026-05-12 2026-03-31 13F MARATHON PETE COM 56585A102 5,917 -90 -1.50 1,445 47.95 0.0412
2026-01-20 2025-12-31 13F MARATHON PETE COM 56585A102 6,007 -622 -9.38 977 -23.57 0.0281
2025-10-24 2025-09-30 13F MARATHON PETE COM 56585A102 6,629 -186 -2.73 1,278 12.81 0.0391
2025-07-29 2025-06-30 13F MARATHON PETE COM 56585A102 6,815 -433 -5.97 1,132 7.30 0.0360
2025-04-21 2025-03-31 13F MARATHON PETE COM 56585A102 7,248 -2 -0.03 1,056 4.35 0.0367
2025-01-16 2024-12-31 13F MARATHON PETE COM 56585A102 7,250 536 7.98 1,011 -7.50 0.0365
2024-10-17 2024-09-30 13F MARATHON PETE COM 56585A102 6,714 -870 -11.47 1,094 -16.88 0.0415
2024-07-15 2024-06-30 13F MARATHON PETE COM 56585A102 7,584 -1,296 -14.59 1,316 -26.50 0.0536
2024-04-15 2024-03-31 13F MARATHON PETE COM 56585A102 8,880 -408 -4.39 1,789 29.92 0.0741
2024-01-26 2023-12-31 13F MARATHON PETE COM 56585A102 9,288 780 9.17 1,378 6.99 0.0621
2023-10-18 2023-09-30 13F MARATHON PETE COM 56585A102 8,508 684 8.74 1,288 41.12 0.0659
2023-07-19 2023-06-30 13F MARATHON PETE COM 56585A102 7,824 -2 -0.03 912 -13.55 0.0461
2023-04-27 2023-03-31 13F MARATHON PETE COM 56585A102 7,826 -19 -0.24 1,055 15.55 0.0552
2023-01-23 2022-12-31 13F MARATHON PETE COM 56585A102 7,845 1,150 17.18 913 37.09 0.0465
2022-10-28 2022-09-30 13F MARATHON PETE COM 56585A102 6,695 528 8.56 666 31.88 0.0326
2022-07-25 2022-06-30 13F MARATHON PETE COM 56585A102 6,167 -251 -3.91 505 -8.18 0.0244
2022-05-06 2022-03-31 13F MARATHON PETE COM 56585A102 6,418 1,029 19.09 550 59.88 0.0302
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 5,389 203 3.91 344 6.50 0.0184
2021-10-27 2021-09-30 13F MARATHON PETE COM 56585A102 5,186 3 0.06 323 3.19 0.0190
2021-08-13 2021-06-30 13F MARATHON PETE COM 56585A102 5,183 -288 -5.26 313 6.46 0.0177
2021-05-11 2021-03-31 13F MARATHON PETE COM 56585A102 5,471 165 3.11 294 34.25 0.0188
2021-02-01 2020-12-31 13F MARATHON PETE COM 56585A102 5,306 5,306 219 0.0149
2020-10-29 2020-09-30 13F MARATHON PETE COM 56585A102 0 -5,378 -100.00 0 -100.00
2020-08-06 2020-06-30 13F MARATHON PETE COM 56585A102 5,378 5,378 200 0.0186
2020-05-05 2020-03-31 13F MARATHON PETE COM 56585A102 0 -8,481 -100.00 0 -100.00
2020-01-27 2019-12-31 13F MARATHON PETE COM 56585A102 8,481 -524 -5.82 510 -6.59 0.0472
2019-11-04 2019-09-30 13F MARATHON PETE COM 56585A102 9,005 -1,691 -15.81 546 -8.54 0.0489
2019-08-06 2019-06-30 13F MARATHON PETE COM 56585A102 10,696 1,076 11.19 597 3.65 0.0498
2019-08-06 2019-03-31 13F/A-1 MARATHON PETE COM 56585A102 9,620 -466 -4.62 576 -3.36 0.0471
2019-05-03 2019-03-31 13F MARATHON PETE COM 56585A102 9,620 -466 576
2019-02-04 2018-12-31 13F MARATHON PETE COM 56585A102 10,086 2,144 27.00 596 -6.14 0.0452
2018-10-26 2018-09-30 13F MARATHON PETE COM 56585A102 7,942 0 0.00 635 14.00 0.0543
2018-08-07 2018-06-30 13F MARATHON PETE COM 56585A102 7,942 18 0.23 557 -3.80 0.0477
2018-05-04 2018-03-31 13F MARATHON PETE COM 56585A102 7,924 7,924 579 0.0505
2018-01-31 2017-12-31 13F MARATHON PETE COM 56585A102 0 -8,729 -100.00 0 -100.00
2017-11-13 2017-09-30 13F MARATHON PETE COM 56585A102 8,729 -1,571 -15.25 490 -9.09 0.0411
2017-08-03 2017-06-30 13F MARATHON PETE COM 56585A102 10,300 556 5.71 539 9.55 0.0469
2017-05-12 2017-03-31 13F MARATHON PETE COM 56585A102 9,744 -152 -1.54 492 -1.20 0.0419
2017-02-10 2016-12-31 13F MARATHON PETE COM 56585A102 9,896 -2,969 -23.08 498 -4.60 0.0451
2016-11-10 2016-09-30 13F MARATHON PETE COM 56585A102 12,865 12,865 522 0.0520
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.