Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionTortoise Capital Advisors, L.l.c.
Latest Disclosed Ownership169,704 shares
Latest Disclosed Value $ 41,438,323
Tortoise Capital Advisors, L.l.c. reports 512.30% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - Tortoise Capital Advisors, L.l.c. filed a 13F-HR form disclosing ownership of 169,704 shares of Marathon Petroleum Corporation (MX:MPC) valued at $41,438,323 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 27,716 shares of Marathon Petroleum Corporation. This represents a change in shares of 512.30% 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.

Upgrade to unlock premium data and export to Excel .

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 Petroleum cs 56585A102 169,704 141,988 512.30 41,438 819.41 0.2384
2026-02-17 2025-12-31 13F Marathon Petroleum COM 56585A102 27,716 -1,008 -3.51 4,507 -18.59 0.0574
2025-11-13 2025-09-30 13F Marathon Petroleum COM 56585A102 28,724 -924 -3.12 5,536 12.43 0.0714
2025-08-14 2025-06-30 13F Marathon Petroleum cs 56585A102 29,648 -1,627 -5.20 4,925 8.08 0.0642
2025-05-14 2025-03-31 13F Marathon Petroleum COM 56585A102 31,275 0 0.00 4,556 4.45 0.0551
2025-02-13 2024-12-31 13F Marathon Petroleum cs 56585A102 31,275 0 0.00 4,363 -14.39 0.0559
2024-11-13 2024-09-30 13F Marathon Petroleum com 56585A102 31,275 31,275 5,095 0.0656
2022-11-14 2022-09-30 13F Marathon Petroleum cs 56585A102 0 -761 -100.00 0 -100.00
2022-08-15 2022-06-30 13F/A-1 Marathon Petroleum cs 56585A102 761 0 0.00 63 -3.08 0.0010
2022-08-10 2022-06-30 13F Marathon Petroleum cs 56585A102 761 0 63 0.0010
2022-05-16 2022-03-31 13F Marathon Petroleum cs 56585A102 761 243 46.91 65 96.97 0.0009
2022-02-14 2021-12-31 13F Marathon Petroleum cs 56585A102 518 0 0.00 33 3.13 0.0005
2021-11-04 2021-09-30 13F Marathon Petroleum cs 56585A102 518 -106,513 -99.52 32 -99.51 0.0005
2021-08-10 2021-06-30 13F Marathon Petroleum cs 56585A102 107,031 106,513 20,562.36 6,467 22,996.43 0.0981
2021-05-17 2021-03-31 13F Marathon Petroleum cs 56585A102 518 0 0.00 28 33.33 0.0005
2021-02-16 2020-12-31 13F/A-1 Marathon Petroleum cs 56585A102 518 0 0.00 21 40.00 0.0004
2020-11-13 2020-09-30 13F Marathon Petroleum cs 56585A102 518 -122,700 -99.58 15 -99.67 0.0003
2020-08-14 2020-06-30 13F Marathon Petroleum cs 56585A102 123,218 -4,766 -3.72 4,606 52.37 0.0740
2020-05-14 2020-03-31 13F/A-1 Marathon Petroleum cs 56585A102 127,984 -436,178 -77.31 3,023 -91.11 0.0558
2020-05-14 2020-03-31 13F Marathon Petroleum cs 56585A102 127,984 -436,178 3,023 33,853.7038
2020-02-21 2019-12-31 13F/A-2 Marathon Petroleum COM 56585A102 564,162 59,644 11.82 33,991 10.90 0.2160
2020-02-19 2019-12-31 13F/A-1 Marathon Petroleum COM 56585A102 564,162 0 33,991 0.2091
2020-02-14 2019-12-31 13F Marathon Petroleum COM 56585A102 564,162 59,644 33,991 136,771.3834
2019-11-14 2019-09-30 13F Marathon Petroleum COM 56585A102 504,518 464,212 1,151.72 30,649 1,260.97 0.1878
2019-08-14 2019-06-30 13F Marathon Petroleum COM 56585A102 40,306 4,168 11.53 2,252 4.11 0.0147
2019-05-13 2019-03-31 13F Marathon Petroleum COM 56585A102 36,138 -17,982 -33.23 2,163 -32.28 0.0134
2019-02-13 2018-12-31 13F Marathon Petroleum COM 56585A102 54,120 18,178 50.58 3,194 11.13 0.0232
2018-12-13 2018-09-30 13F/A-1 Marathon Petroleum COM 56585A102 35,942 24,645 218.16 2,874 262.42 0.0168
2018-11-08 2018-09-30 13F Marathon Petroleum COM 56585A102 35,942 24,645 2,874
2018-08-07 2018-06-30 13F Marathon Petroleum COM 56585A102 11,297 -27,344 -70.76 793 -71.93 0.0051
2018-05-17 2018-03-31 13F/A-1 Marathon Petroleum COM 56585A102 38,641 1,542 4.16 2,825 15.40 0.0198
2018-05-15 2018-03-31 13F Marathon Petroleum COM 56585A102 38,641 2,825
2018-02-14 2017-12-31 13F Marathon Petroleum COM 56585A102 37,099 -7,851 -17.47 2,448 -2.90 0.0161
2017-11-17 2017-09-30 13F/A-1 MARATHON PETE COM 56585A102 44,950 1,524 3.51 2,521 10.96 0.0165
2017-11-13 2017-09-30 13F MARATHON PETE COM 56585A102 44,950 1,524 2,521
2017-11-13 2017-06-30 13F/A-1 MARATHON PETE COM 56585A102 43,426 -5,635 -11.49 2,272 -8.39 0.0147
2017-08-01 2017-06-30 13F MARATHON PETE COM 56585A102 43,426 -5,635 2,272
2017-05-15 2017-03-31 13F MARATHON PETE COM 56585A102 49,061 19,093 63.71 2,480 64.35 0.0152
2017-02-14 2016-12-31 13F MARATHON PETE COM 56585A102 29,968 8,092 36.99 1,509 69.93 0.0097
2016-11-14 2016-09-30 13F MARATHON PETE COM 56585A102 21,876 5,325 32.17 888 41.40 0.0059
2016-08-11 2016-06-30 13F MARATHON PETE COM 56585A102 16,551 16,551 0.00 628 0.0044
2016-02-12 2015-12-31 13F MARATHON PETE COM 56585A102 0 -12,188 -100.00 0 -100.00
2015-11-16 2015-09-30 13F MARATHON PETE COM 56585A102 12,188 -13,316 -52.21 565 -57.65 0.0045
2015-08-13 2015-06-30 13F MARATHON PETE COM 56585A102 25,504 14,582 133.51 1,334 19.32 0.0081
2015-05-08 2015-03-31 13F MARATHON PETE COM 56585A102 10,922 -554 -4.83 1,118 7.92 0.0066
2015-02-10 2014-12-31 13F MARATHON PETE COM 56585A102 11,476 9,240 413.24 1,036 431.28 0.0062
2014-05-09 2014-03-31 13F MARATHON PETE COM 56585A102 2,236 428 23.67 195 17.47 0.0013
2014-02-11 2013-12-31 13F MARATHON PETE COM 56585A102 1,808 1,808 4,786.49 166 5,433.33 0.0012
2013-11-12 2013-09-30 13F MARATHON PETE COM 56585A102 0 -37 -100.00 0 -100.00
2013-08-13 2013-06-30 13F MARATHON PETE COM 56585A102 37 37 3 0.0000
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.