Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionHolocene Advisors, LP
Latest Disclosed Ownership414,134 shares
Latest Disclosed Value $ 101,123,240
Holocene Advisors, LP ownership in MPC / Marathon Petroleum Corporation

On May 15, 2026 - Holocene Advisors, LP filed a 13F-HR form disclosing ownership of 414,134 shares of Marathon Petroleum Corporation (US:MPC) valued at $101,123,240 USD as of March 31, 2026. The entity filed a previous 13F-HR on August 14, 2025 disclosing 0 shares of Marathon Petroleum Corporation. The current value of the position is $110,660,746 USD.

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 414,134 414,134 101,123 0.2439
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 0 -19,790 -100.00 0 -100.00
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 19,790 -10,951 -35.62 2,883 -32.77 0.0084
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 30,741 28,215 1,116.98 4,288 943.31 0.0137
2024-11-14 2024-09-30 13F MARATHON PETE COM 56585A102 2,526 -349,595 -99.28 412 -99.33 0.0017
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 352,121 352,121 61,086 0.2550
2024-05-15 2024-03-31 13F MARATHON PETE COM 56585A102 0 -235,179 -100.00 0 -100.00
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 235,179 235,179 34,891 0.1360
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 0 -460,146 -100.00 0 -100.00
2023-05-15 2023-03-31 13F MARATHON PETE COM 56585A102 460,146 313,392 213.55 62,041 263.24 0.3050
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 146,754 -66,370 -31.14 17,081 -19.32 0.1042
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 213,124 -1,137,521 -84.22 21,170 -80.93 0.1353
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 1,350,645 -35,935 -2.59 111,037 -6.34 0.6706
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 1,386,580 -219,776 -13.68 118,553 15.33 0.6178
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 1,606,356 -728,615 -31.20 102,791 -28.78 0.5350
2021-11-15 2021-09-30 13F MARATHON PETE COM 56585A102 2,334,971 680,250 41.11 144,325 44.36 0.7843
2021-08-16 2021-06-30 13F MARATHON PETE COM 56585A102 1,654,721 -334,134 -16.80 99,978 -6.02 0.5645
2021-05-17 2021-03-31 13F MARATHON PETE COM 56585A102 1,988,855 -2,779,115 -58.29 106,384 -46.05 0.6672
2021-02-16 2020-12-31 13F MARATHON PETE COM 56585A102 4,767,970 1,498,923 45.85 197,203 105.60 1.2443
2020-11-16 2020-09-30 13F MARATHON PETE COM 56585A102 3,269,047 1,237,199 60.89 95,914 26.29 0.7293
2020-08-14 2020-06-30 13F MARATHON PETE COM 56585A102 2,031,848 1,594,342 364.42 75,950 634.95 0.6657
2020-05-15 2020-03-31 13F MARATHON PETE COM 56585A102 437,506 -158,094 -26.54 10,334 -71.20 0.1110
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 595,600 15,491 2.67 35,885 1.82 0.3216
2019-11-14 2019-09-30 13F MARATHON PETE COM 56585A102 580,109 158,632 37.64 35,242 49.63 0.3629
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 421,477 179,293 74.03 23,552 62.48 0.3004
2019-05-15 2019-03-31 13F MARATHON PETE COM 56585A102 242,184 -246,486 -50.44 14,495 -49.73 0.2218
2019-02-14 2018-12-31 13F MARATHON PETE COM 56585A102 488,670 488,670 28,836 0.4648
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.