Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionARS Investment Partners, LLC
Latest Disclosed Ownership165,648 shares
Latest Disclosed Value $ 40,447,929
ARS Investment Partners, LLC reports 65.57% increase in ownership of MPC / Marathon Petroleum Corporation

On April 16, 2026 - ARS Investment Partners, LLC filed a 13F-HR form disclosing ownership of 165,648 shares of Marathon Petroleum Corporation (MX:MPC) valued at $40,447,929 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 100,049 shares of Marathon Petroleum Corporation. This represents a change in shares of 65.57% 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)
2026-04-16 2026-03-31 13F MARATHON PETE COM 56585A102 165,648 65,599 65.57 40,448 148.60 2.1023
2026-02-05 2025-12-31 13F MARATHON PETE COM 56585A102 100,049 -848 -0.84 16,271 -16.33 0.9508
2025-10-15 2025-09-30 13F MARATHON PETE COM 56585A102 100,897 -18,505 -15.50 19,447 -1.95 1.2840
2025-08-11 2025-06-30 13F MARATHON PETE COM 56585A102 119,402 -1,446 -1.20 19,834 17.65 1.4467
2025-05-14 2025-03-31 13F MARATHON PETE COM 56585A102 120,848 -157 -0.13 16,858 -0.13 1.5255
2025-01-16 2024-12-31 13F MARATHON PETE COM 56585A102 121,005 -1,462 -1.19 16,880 -15.39 1.5209
2024-10-16 2024-09-30 13F MARATHON PETE COM 56585A102 122,467 892 0.73 19,951 -5.40 1.7882
2024-07-17 2024-06-30 13F MARATHON PETE COM 56585A102 121,575 -1,046 -0.85 21,091 -14.64 2.0170
2024-05-02 2024-03-31 13F MARATHON PETE COM 56585A102 122,621 606 0.50 24,708 36.49 2.4620
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 122,015 -1,020 -0.83 18,102 -2.78 2.0058
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 123,035 110,339 869.08 18,620 1,158.11 2.3080
2023-07-11 2023-06-30 13F MARATHON PETE COM 56585A102 12,696 0 0.00 1,480 -13.50 0.1730
2023-04-05 2023-03-31 13F MARATHON PETE COM 56585A102 12,696 0 0.00 1,712 15.84 0.2055
2023-01-25 2022-12-31 13F MARATHON PETE COM 56585A102 12,696 -10,060 -44.21 1,478 -34.65 0.1966
2022-10-07 2022-09-30 13F MARATHON PETE COM 56585A102 22,756 10,000 78.39 2,260 115.44 0.3108
2022-07-15 2022-06-30 13F MARATHON PETE COM 56585A102 12,756 0 0.00 1,049 -3.85 0.1433
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 12,756 -112,688 -89.83 1,091 -86.41 0.1052
2022-02-11 2021-12-31 13F MARATHON PETE COM 56585A102 125,444 320 0.26 8,027 3.79 0.7372
2021-11-05 2021-09-30 13F MARATHON PETE COM 56585A102 125,124 2,035 1.65 7,734 3.99 0.7740
2021-08-06 2021-06-30 13F MARATHON PETE COM 56585A102 123,089 831 0.68 7,437 13.72 0.7580
2021-05-13 2021-03-31 13F MARATHON PETE COM 56585A102 122,258 -38,387 -23.90 6,540 -1.57 0.7596
2021-02-09 2020-12-31 13F MARATHON PETE COM 56585A102 160,645 160,645 6,644 0.8178
2020-05-12 2020-03-31 13F MARATHON PETE COM 56585A102 0 -67,714 -100.00 0 -100.00
2020-02-12 2019-12-31 13F MARATHON PETE COM 56585A102 67,714 -55,433 -45.01 4,080 -45.46 0.6857
2019-11-14 2019-09-30 13F MARATHON PETE COM 56585A102 123,147 -80,645 -39.57 7,481 -34.31 1.3440
2019-08-12 2019-06-30 13F MARATHON PETE COM 56585A102 203,792 9,773 5.04 11,388 -1.93 1.9141
2019-05-09 2019-03-31 13F MARATHON PETE COM 56585A102 194,019 -3,340 -1.69 11,612 -0.29 2.1017
2019-02-13 2018-12-31 13F MARATHON PETE COM 56585A102 197,359 160 0.08 11,646 -26.15 2.4645
2018-11-13 2018-09-30 13F MARATHON PETE COM 56585A102 197,199 1,512 0.77 15,770 14.87 2.4429
2018-11-13 2018-06-30 13F/A-1 MARATHON PETE COM 56585A102 195,687 836 0.43 13,729 -3.63 2.1908
2018-08-13 2018-06-30 13F MARATHON PETE COM 56585A102 195,687 836 13,729
2018-05-04 2018-03-31 13F MARATHON PETE COM 56585A102 194,851 -77,701 -28.51 14,246 -20.78 1.7449
2018-02-14 2017-12-31 13F MARATHON PETE COM 56585A102 272,552 -1,407 -0.51 17,983 17.05 2.1745
2017-11-14 2017-09-30 13F MARATHON PETE COM 56585A102 273,959 -39,038 -12.47 15,364 -6.20 1.9793
2017-08-04 2017-06-30 13F MARATHON PETE CS 56585A102 312,997 -2,629 -0.83 16,379 2.68 2.2626
2017-05-10 2017-03-31 13F MARATHON PETE CS 56585A102 315,626 -3,170 -0.99 15,952 -0.62 2.3182
2017-02-15 2016-12-31 13F MARATHON PETE CS 56585A102 318,796 318,796 5,213.27 16,051 4,058.29 2.4708
2014-02-11 2013-12-31 13F Marathon Pete COM 56585A102 0 -6,000 -100.00 0 -100.00
2013-11-08 2013-09-30 13F Marathon Pete COM 56585A102 6,000 -6,000 -50.00 386 -54.75 0.0658
2013-08-14 2013-06-30 13F Marathon Pete COM 56585A102 12,000 12,000 853 0.1499
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.