Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership394,464 shares
Latest Disclosed Value $ 96,320
Natixis Advisors, L.p. reports 63.91% increase in ownership of MPC / Marathon Petroleum Corporation

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 394,464 shares of Marathon Petroleum Corporation (MX:MPC) valued at $96,320 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 240,659 shares of Marathon Petroleum Corporation. This represents a change in shares of 63.91% 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)
2026-05-13 2026-03-31 13F MARATHON PETE COM 56585A102 394,464 153,805 63.91 96 146.15 0.1340
2026-02-10 2025-12-31 13F MARATHON PETE COM 56585A102 240,659 -22,193 -8.44 39 -22.00 0.0555
2025-11-13 2025-09-30 13F MARATHON PETE CORP COM 56585A102 262,852 -22,737 -7.96 51 6.38 0.0739
2025-08-13 2025-06-30 13F MARATHON PETE COM 56585A102 285,589 36,510 14.66 47 30.56 0.0753
2025-05-08 2025-03-31 13F MARATHON PETE COM 56585A102 249,079 14,316 6.10 36 12.50 0.0671
2025-02-10 2024-12-31 13F MARATHON PETE COM 56585A102 234,763 1,514 0.65 33 -13.51 0.0612
2024-11-06 2024-09-30 13F MARATHON PETE COM 56585A102 233,249 139 0.06 38 -7.50 0.0741
2024-08-01 2024-06-30 13F MARATHON PETE COM 56585A102 233,110 5,889 2.59 40 -11.11 0.0879
2024-04-25 2024-03-31 13F MARATHON PETE COM 56585A102 227,221 6,373 2.89 46 40.63 0.1053
2024-02-06 2023-12-31 13F MARATHON PETE COM 56585A102 220,848 18,990 9.41 33 6.67 0.0862
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 201,858 2,573 1.29 31 30.43 0.0934
2023-08-15 2023-06-30 13F MARATHON PETE COM 56585A102 199,285 -24,076 -10.78 23 -23.33 0.0717
2023-05-11 2023-03-31 13F MARATHON PETE COM 56585A102 223,361 29,554 15.25 30 36.36 0.1036
2023-01-27 2022-12-31 13F MARATHON PETE COM 56585A102 193,807 -2,158 -1.10 23 -99.89 0.0853
2022-11-14 2022-09-30 13F MARATHON PETROLEUM COM 56585A102 195,965 9,572 5.14 19,465 27.03 0.0823
2022-08-12 2022-06-30 13F MARATHON OIL COM 56585A102 186,393 2,969 1.62 15,323 -2.30 0.0674
2022-05-12 2022-03-31 13F MARATHON PETE COM 56585A102 183,424 -97,448 -34.69 15,683 -12.74 0.0598
2022-02-08 2021-12-31 13F MARATHON PETE COM 56585A102 280,872 -21,281 -7.04 17,973 -3.76 0.0686
2021-11-15 2021-09-30 13F MARATHON PETE COM 56585A102 302,153 -42,426 -12.31 18,676 -10.29 0.0768
2021-08-12 2021-06-30 13F MARATHON PETE COM 56585A102 344,579 -59,330 -14.69 20,819 -3.64 0.0972
2021-05-05 2021-03-31 13F MARATHON PETE COM 56585A102 403,909 128 0.03 21,605 29.37 0.1128
2021-02-12 2020-12-31 13F MARATHON PETE COM 56585A102 403,781 85,127 26.71 16,700 78.63 0.0962
2020-11-12 2020-09-30 13F MARATHON PETE COM 56585A102 318,654 -57,339 -15.25 9,349 -33.48 0.0588
2020-08-11 2020-06-30 13F MARATHON PETE COM 56585A102 375,993 37,173 10.97 14,055 75.62 0.0933
2020-04-27 2020-03-31 13F MARATHON PETE COM 56585A102 338,820 50,953 17.70 8,003 -53.86 0.0652
2020-02-10 2019-12-31 13F MARATHON PETE COM 56585A102 287,867 35,246 13.95 17,344 13.01 0.1223
2019-11-12 2019-09-30 13F MARATHON PETE COM 56585A102 252,621 33,568 15.32 15,347 25.37 0.1218
2019-08-12 2019-06-30 13F MARATHON PETE COM 56585A102 219,053 26,121 13.54 12,241 6.01 0.1000
2019-05-15 2019-03-31 13F/A-1 MARATHON PETE COM 56585A102 192,932 -943 -0.49 11,547 0.94 0.1011
2019-05-15 2019-03-31 13F MARATHON PETE COM 56585A102 192,932 -943 11,547
2019-02-13 2018-12-31 13F/A-1 MARATHON PETE COM 56585A102 193,875 5,382 2.86 11,440 -24.10 0.1130
2019-02-13 2018-12-31 13F MARATHON PETE COM 56585A102 193,875 5,382 11,440
2018-11-13 2018-09-30 13F MARATHON PETE COM 56585A102 188,493 11,656 6.59 15,073 21.49 0.1327
2018-08-14 2018-06-30 13F/A-1 MARATHON PETE COM 56585A102 176,837 6,274 3.68 12,407 -0.51 0.1185
2018-08-14 2018-06-30 13F MARATHON PETE COM 56585A102 176,837 12,407
2018-05-10 2018-03-31 13F MARATHON PETE COM 56585A102 170,563 15,108 9.72 12,470 21.59 0.1231
2018-02-14 2017-12-31 13F MARATHON PETE COM 56585A102 155,455 -19,518 -11.15 10,256 4.54 0.1045
2017-11-14 2017-09-30 13F MARATHON PETE COM 56585A102 174,973 4,584 2.69 9,811 10.03 0.1036
2017-07-27 2017-06-30 13F MARATHON PETE COM 56585A102 170,389 14,487 9.29 8,917 13.17 0.0965
2017-05-12 2017-03-31 13F MARATHON PETE COM 56585A102 155,902 17,042 12.27 7,879 12.69 0.0873
2017-02-07 2016-12-31 13F MARATHON PETE COM 56585A102 138,860 15,538 12.60 6,992 39.67 0.0841
2016-11-04 2016-09-30 13F MARATHON PETE COM 56585A102 123,322 -11,655 -8.63 5,006 -2.30 0.0648
2016-08-01 2016-06-30 13F MARATHON PETE COM 56585A102 134,977 -106,837 -44.18 5,124 -43.01 0.0708
2016-05-06 2016-03-31 13F MARATHON PETE COM 56585A102 241,814 49,337 25.63 8,991 -9.89 0.1345
2016-02-12 2015-12-31 13F MARATHON PETE COM 56585A102 192,477 54,530 39.53 9,978 56.13 0.1636
2015-11-12 2015-09-30 13F MARATHON PETE COM 56585A102 137,947 -432 -0.31 6,391 -11.71 0.1109
2015-08-14 2015-06-30 13F MARATHON PETE COM 56585A102 138,379 86,038 164.38 7,239 35.08 0.1229
2015-05-15 2015-03-31 13F MARATHON PETE COM 56585A102 52,341 1,458 2.87 5,359 16.68 0.0941
2015-02-05 2014-12-31 13F MARATHON PETE COM 56585A102 50,883 19,750 63.44 4,593 74.24 0.0860
2014-11-03 2014-09-30 13F MARATHON PETE COM 56585A102 31,133 3,036 10.81 2,636 20.20 0.0529
2014-08-13 2014-06-30 13F MARATHON PETE COM 56585A102 28,097 2,297 8.90 2,193 -2.36 0.0314
2014-05-13 2014-03-31 13F MARATHON PETE COM 56585A102 25,800 5,103 24.66 2,246 18.27 0.0346
2014-02-12 2013-12-31 13F MARATHON PETE COM 56585A102 20,697 3,931 23.45 1,899 76.00 0.0311
2013-10-30 2013-09-30 13F MARATHON PETE COM 56585A102 16,766 -1,586 -8.64 1,079 -17.25 0.0199
2013-07-19 2013-06-30 13F MARATHON PETE COM 56585A102 18,352 18,352 1,304 0.0260
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.