Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership193,069 shares
Latest Disclosed Value $ 31,400,989
Sei Investments Co reports 5.92% increase in ownership of MPC / Marathon Petroleum Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 193,069 shares of Marathon Petroleum Corporation (MX:MPC) valued at $31,400,989 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 182,282 shares of Marathon Petroleum Corporation. This represents a change in shares of 5.92% 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)
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 193,069 10,787 5.92 31,401 -10.63 0.0310
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 182,282 11,494 6.73 35,134 23.85 0.0378
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 170,788 44,688 35.44 28,368 54.40 0.0329
2025-05-14 2025-03-31 13F/A-1 MARATHON PETE COM 56585A102 126,100 9,678 8.31 18,372 13.09 0.0236
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 115,668 -754 16,657 0.0181
2025-02-11 2024-12-31 13F MARATHON PETE COM 56585A102 116,422 -18,253 -13.55 16,245 -25.95 0.0209
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 134,675 -24,709 -15.50 21,940 -20.65 0.0285
2024-08-13 2024-06-30 13F MARATHON PETE COM 56585A102 159,384 7,245 4.76 27,649 -9.81 0.0392
2024-05-07 2024-03-31 13F MARATHON PETE COM 56585A102 152,139 11,013 7.80 30,657 46.41 0.0449
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 141,126 -7,164 -4.83 20,939 -6.70 0.0336
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 148,290 -57 -0.04 22,442 29.74 0.0403
2023-08-11 2023-06-30 13F MARATHON PETE COM 56585A102 148,347 -1,260 -0.84 17,298 -14.23 0.0302
2023-05-12 2023-03-31 13F MARATHON PETE COM 56585A102 149,607 23,329 18.47 20,170 37.23 0.0375
2023-02-10 2022-12-31 13F MARATHON PETE COM 56585A102 126,278 4,958 4.09 14,697 21.97 0.0327
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 121,320 15,023 14.13 12,050 38.00 0.0269
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 106,297 15,381 16.92 8,732 11.95 0.0189
2022-05-13 2022-03-31 13F MARATHON PETE COM 56585A102 90,916 18,230 25.08 7,800 67.92 0.0157
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 72,686 13,073 21.93 4,645 27.02 0.0087
2021-11-12 2021-09-30 13F MARATHON PETE COM 56585A102 59,613 11,581 24.11 3,657 26.72 0.0077
2021-08-06 2021-06-30 13F MARATHON PETE COM 56585A102 48,032 3,335 7.46 2,886 45.39 0.0064
2021-05-12 2021-03-31 13F MARATHON PETE COM 56585A102 44,697 -3,056 -6.40 1,985 -0.50 0.0050
2021-02-08 2020-12-31 13F MARATHON PETE COM 56585A102 47,753 -9,256 -16.24 1,995 14.00 0.0052
2020-12-04 2020-09-30 13F/A-1 MARATHON PETE COM 56585A102 57,009 -294,119 -83.76 1,750 -86.72 0.0051
2020-11-06 2020-09-30 13F MARATHON PETE COM 56585A102 74,213 -276,915 2,255 5,429.5386
2020-08-17 2020-06-30 13F/A-1 MARATHON PETE COM 56585A102 351,128 -172,864 -32.99 13,177 6.14 0.0409
2020-08-11 2020-06-30 13F MARATHON PETE COM 56585A102 361,702 -162,290 18,668 50,637.9437
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 523,992 143,904 37.86 12,415 -45.79 0.0456
2020-02-06 2019-12-31 13F MARATHON PETE COM 56585A102 380,088 -23,833 -5.90 22,903 -6.64 0.0683
2019-11-12 2019-09-30 13F MARATHON PETE COM 56585A102 403,921 -319,819 -44.19 24,532 -39.34 0.0628
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 723,740 74,895 11.54 40,445 4.16 0.1321
2019-05-15 2019-03-31 13F MARATHON PETE COM 56585A102 648,845 -31,071 -4.57 38,828 -17.08 0.1304
2019-02-13 2018-12-31 13F MARATHON PETE COM 56585A102 679,916 155,646 29.69 46,824 11.72 0.1667
2018-11-08 2018-09-30 13F MARATHON PETE COM 56585A102 524,270 -21,321 -3.91 41,913 9.50 0.1519
2018-08-03 2018-06-30 13F MARATHON PETE COM 56585A102 545,591 227,260 71.39 38,276 64.46 0.1301
2018-05-11 2018-03-31 13F MARATHON PETE COM 56585A102 318,331 -145,405 -31.36 23,274 -23.94 0.0892
2018-02-08 2017-12-31 13F MARATHON PETE COM 56585A102 463,736 -49,081 -9.57 30,598 6.39 0.1063
2017-11-06 2017-09-30 13F MARATHON PETE COM 56585A102 512,817 -4,467 -0.86 28,760 6.25 0.1022
2017-07-31 2017-06-30 13F MARATHON PETE COM 56585A102 517,284 60,788 13.32 27,069 17.33 0.1079
2017-05-05 2017-03-31 13F MARATHON PETE COM 56585A102 456,496 205,653 81.98 23,070 82.66 0.1011
2017-02-02 2016-12-31 13F MARATHON PETE COM 56585A102 250,843 119,539 91.04 12,630 137.01 0.0612
2016-11-04 2016-09-30 13F MARATHON PETE COM 56585A102 131,304 -20,417 -13.46 5,329 -7.47 0.0271
2016-08-11 2016-06-30 13F MARATHON PETE COM 56585A102 151,721 15,173 11.11 5,759 13.43 0.0345
2016-05-10 2016-03-31 13F/A-1 MARATHON PETE COM 56585A102 136,548 23,989 21.31 5,077 -13.01 0.0316
2016-02-03 2015-12-31 13F MARATHON PETE COM 56585A102 112,559 47,058 71.84 5,836 92.29 0.0356
2015-11-02 2015-09-30 13F/A-1 MARATHON PETE COM 56585A102 65,501 -29,972 -31.39 3,035 -39.23 0.0279
2015-10-30 2015-09-30 13F DIREXION SHS ETF TR COM 56585A102 65,501 3,035
2015-08-07 2015-06-30 13F/A-1 MARATHON PETE COM 56585A102 95,473 76,569 405.04 4,994 156.63 0.0451
2015-08-04 2015-06-30 13F MARATHON PETE COM 56585A102 95,473 76,569 4,994 0.0451
2015-05-14 2015-03-31 13F/A-1 MARATHON PETE COM 56585A102 18,904 -1,074 -5.38 1,946 8.23 0.0169
2015-05-01 2015-03-31 13F MARATHON PETE COM 56585A102 18,904 1,946
2015-02-10 2014-12-31 13F MARATHON PETE COM 56585A102 19,978 19,978 1,798 0.0159
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.