Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionTortoise Investment Management, LLC
Latest Disclosed Ownership910 shares
Latest Disclosed Value $ 222,119
Tortoise Investment Management, LLC ownership in MPC / Marathon Petroleum Corporation

On May 5, 2026 - Tortoise Investment Management, LLC filed a 13F-HR form disclosing ownership of 910 shares of Marathon Petroleum Corporation (MX:MPC) valued at $222,119 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 0 shares of Marathon Petroleum Corporation.

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)
2026-05-05 2026-03-31 13F MARATHON PETE COM 56585A102 910 910 222 0.0183
2026-02-06 2025-12-31 13F MARATHON PETE COM 56585A102 0 -100.00 0
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 887 8 0.91 171 17.24 0.0152
2025-08-08 2025-06-30 13F MARATHON PETE COM 56585A102 879 14 1.62 146 16.00 0.0139
2025-08-07 2025-03-31 13F/A-1 MARATHON PETE COM 56585A102 865 5 0.58 126 4.17 0.0131
2025-05-14 2025-03-31 13F MARATHON PETE COM 56585A102 865 5 126 0.0131
2025-08-07 2024-12-31 13F/A-1 MARATHON PETE COM 56585A102 860 4 0.47 120 -13.67 0.0127
2025-02-07 2024-12-31 13F MARATHON PETE COM 56585A102 860 4 120 0.0127
2025-08-07 2024-09-30 13F/A-1 MARATHON PETE COM 56585A102 856 3 0.35 140 -6.08 0.0146
2024-11-13 2024-09-30 13F MARATHON PETE COM 56585A102 856 3 140 0.0146
2025-08-07 2024-06-30 13F/A-1 MARATHON PETE COM 56585A102 853 3 0.35 148 -13.45 0.0169
2024-08-01 2024-06-30 13F MARATHON PETE COM 56585A102 853 3 148 0.0169
2025-08-07 2024-03-31 13F/A-1 MARATHON PETE COM 56585A102 850 3 0.35 171 36.80 0.0208
2024-05-09 2024-03-31 13F MARATHON PETE COM 56585A102 850 3 171 0.0208
2025-08-07 2023-12-31 13F/A-1 MARATHON PETE COM 56585A102 847 94 12.48 126 10.62 0.0170
2024-02-08 2023-12-31 13F MARATHON PETE COM 56585A102 847 94 144 0.0186
2025-08-07 2023-09-30 13F/A-1 MARATHON PETE COM 56585A102 753 3 0.40 114 29.89 0.0170
2023-11-09 2023-09-30 13F MARATHON PETE COM 56585A102 753 3 114 0.0170
2023-08-07 2023-06-30 13F MARATHON PETE COM 56585A102 750 650 650.00 87 569.23 0.0130
2023-05-09 2023-03-31 13F MARATHON PETE COM 56585A102 100 0 0.00 13 18.18 0.0021
2023-02-03 2022-12-31 13F MARATHON PETE COM 56585A102 100 0 0.00 12 10.00 0.0020
2022-11-04 2022-09-30 13F MARATHON PETE COM 56585A102 100 0 0.00 10 25.00 0.0019
2022-08-03 2022-06-30 13F MARATHON PETE COM 56585A102 100 0 0.00 8 -11.11 0.0016
2022-05-06 2022-03-31 13F MARATHON PETE COM 56585A102 100 0 0.00 9 50.00 0.0017
2022-02-10 2021-12-31 13F MARATHON PETE COM 56585A102 100 100 6 0.0011
2019-08-07 2019-06-30 13F MARATHON PETE COM 56585A102 0 -170 -100.00 0 -100.00
2019-05-07 2019-03-31 13F MARATHON PETE COM 56585A102 170 0 0.00 10 0.00 0.0026
2019-02-08 2018-12-31 13F MARATHON PETE COM 56585A102 170 0 0.00 10 -28.57 0.0027
2018-11-19 2018-09-30 13F MARATHON PETE COM 56585A102 170 0 0.00 14 16.67 0.0037
2018-08-09 2018-06-30 13F MARATHON PETE COM 56585A102 170 0 0.00 12 0.00 0.0033
2018-05-10 2018-03-31 13F MARATHON PETE COM 56585A102 170 0 0.00 12 9.09 0.0033
2018-01-31 2017-12-31 13F MARATHON PETE COM 56585A102 170 170 11 0.0032
2016-11-09 2016-09-30 13F MARATHON PETE COM 56585A102 0 -133 -100.00 0 -100.00
2016-08-03 2016-06-30 13F MARATHON PETE COM 56585A102 133 133 5 0.0017
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.