Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionNissay Asset Management Corp /japan/ /adv
Latest Disclosed Ownership38,498 shares
Latest Disclosed Value $ 9,400,442
Nissay Asset Management Corp /japan/ /adv reports 0.31% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - Nissay Asset Management Corp /japan/ /adv filed a 13F-HR form disclosing ownership of 38,498 shares of Marathon Petroleum Corporation (MX:MPC) valued at $9,400,442 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 38,378 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.31% 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)
2026-05-15 2026-03-31 13F MARATHON PETE COM 56585A102 38,498 120 0.31 9,400 50.62 0.0498
2026-02-17 2025-12-31 13F MARATHON PETE COM 56585A102 38,378 -29 -0.08 6,241 -15.68 0.0325
2025-11-14 2025-09-30 13F MARATHON PETE COM 56585A102 38,407 -150 -0.39 7,403 15.58 0.0409
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 38,557 -1,739 -4.32 6,405 9.10 0.0375
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 40,296 -1,092 -2.64 5,871 4.54 0.0382
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 41,388 -3,232 -7.24 5,615 -22.75 0.0342
2024-11-14 2024-09-30 13F MARATHON PETE COM 56585A102 44,620 -1,595 -3.45 7,269 -9.33 0.0460
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 46,215 -1,349 -2.84 8,017 -16.35 0.0531
2024-05-15 2024-03-31 13F MARATHON PETE COM 56585A102 47,564 -1,554 -3.16 9,584 31.52 0.0664
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 49,118 -3,033 -5.82 7,287 -7.67 0.0586
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 52,151 -168 -0.32 7,893 29.38 0.0700
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 52,319 -4,185 -7.41 6,100 -19.93 0.0526
2023-05-15 2023-03-31 13F MARATHON PETE COM 56585A102 56,504 -4,888 -7.96 7,618 6.62 0.0681
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 61,392 -5,459 -8.17 7,145 7.61 0.0683
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 66,851 -406 -0.60 6,640 20.09 0.0697
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 67,257 -2,881 -4.11 5,529 -7.80 0.0550
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 70,138 -765 -1.08 5,997 32.18 0.0522
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 70,903 526 0.75 4,537 4.30 0.0348
2021-11-10 2021-09-30 13F MARATHON PETE COM 56585A102 70,377 2,858 4.23 4,350 6.64 0.0369
2021-08-13 2021-06-30 13F MARATHON PETE COM 56585A102 67,519 3,862 6.07 4,079 19.79 0.0358
2021-05-11 2021-03-31 13F MARATHON PETE COM 56585A102 63,657 -1,724 -2.64 3,405 25.92 0.0336
2021-02-08 2020-12-31 13F MARATHON PETE COM 56585A102 65,381 -3,089 -4.51 2,704 34.59 0.0407
2020-10-20 2020-09-30 13F MARATHON PETE COM 56585A102 68,470 -13,884 -16.86 2,009 -34.73 0.0339
2020-07-27 2020-06-30 13F MARATHON PETE COM 56585A102 82,354 4,290 5.50 3,078 66.92 0.0597
2020-05-05 2020-03-31 13F MARATHON PETE COM 56585A102 78,064 164 0.21 1,844 -60.71 0.0469
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 77,900 -3,818 -4.67 4,693 -5.46 0.1043
2019-11-14 2019-09-30 13F MARATHON PETE COM 56585A102 81,718 2,399 3.02 4,964 12.00 0.1228
2019-08-07 2019-06-30 13F MARATHON PETE COM 56585A102 79,319 -3,488 -4.21 4,432 -10.57 0.1120
2019-05-03 2019-03-31 13F MARATHON PETE COM 56585A102 82,807 -4,546 -5.20 4,956 -3.86 0.1309
2019-02-06 2018-12-31 13F MARATHON PETE COM 56585A102 87,353 24,865 39.79 5,155 3.16 0.1571
2018-10-30 2018-09-30 13F MARATHON PETE COM 56585A102 62,488 -3,231 -4.92 4,997 8.37 0.1345
2018-08-08 2018-06-30 13F MARATHON PETE COM 56585A102 65,719 2,241 3.53 4,611 -0.65 0.1349
2018-05-14 2018-03-31 13F MARATHON PETE COM 56585A102 63,478 -4,380 -6.45 4,641 3.66 0.1450
2018-02-14 2017-12-31 13F MARATHON PETE COM 56585A102 67,858 67,858 4,477 0.1363
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.