Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionGradient Investments LLC
Latest Disclosed Ownership4,189 shares
Latest Disclosed Value $ 1,022,870
Gradient Investments LLC reports 42.34% increase in ownership of MPC / Marathon Petroleum Corporation

On April 13, 2026 - Gradient Investments LLC filed a 13F-HR form disclosing ownership of 4,189 shares of Marathon Petroleum Corporation (US:MPC) valued at $1,022,870 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 8, 2026 disclosing 2,943 shares of Marathon Petroleum Corporation. This represents a change in shares of 42.34% during the quarter. The current value of the position is $1,119,343 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)
2026-04-13 2026-03-31 13F MARATHON PETE COM 56585A102 4,189 1,246 42.34 1,023 113.81 0.0158
2026-01-08 2025-12-31 13F MARATHON PETE COM 56585A102 2,943 -141 -4.57 479 -19.53 0.0076
2025-10-06 2025-09-30 13F MARATHON PETE COM 56585A102 3,084 -422 -12.04 594 2.06 0.0099
2025-07-08 2025-06-30 13F MARATHON PETE COM 56585A102 3,506 -107 -2.96 582 10.65 0.0106
2025-04-09 2025-03-31 13F MARATHON PETE COM 56585A102 3,613 -526 -12.71 526 -8.84 0.0106
2025-01-21 2024-12-31 13F MARATHON PETE COM 56585A102 4,139 -184 -4.26 577 -18.04 0.0117
2024-10-15 2024-09-30 13F MARATHON PETE COM 56585A102 4,323 61 1.43 704 -4.74 0.0147
2024-07-18 2024-06-30 13F MARATHON PETE COM 56585A102 4,262 87 2.08 739 -12.13 0.0166
2024-04-23 2024-03-31 13F MARATHON PETE COM 56585A102 4,175 -267 -6.01 841 27.62 0.0195
2024-01-18 2023-12-31 13F MARATHON PETE COM 56585A102 4,442 -561 -11.21 659 -12.95 0.0159
2023-10-27 2023-09-30 13F MARATHON PETE COM 56585A102 5,003 -199 -3.83 757 24.92 0.0200
2023-07-11 2023-06-30 13F MARATHON PETE COM 56585A102 5,202 -477 -8.40 607 -20.78 0.0156
2023-04-17 2023-03-31 13F MARATHON PETE COM 56585A102 5,679 -661 -10.43 766 3.80 0.0209
2023-01-10 2022-12-31 13F MARATHON PETE COM 56585A102 6,340 1,817 40.17 738 64.14 0.0233
2022-10-14 2022-09-30 13F MARATHON PETE COM 56585A102 4,523 153 3.50 449 25.07 0.0137
2022-07-11 2022-06-30 13F MARATHON PETE COM 56585A102 4,370 1,760 67.43 359 60.99 0.0105
2022-05-26 2022-03-31 13F MARATHON PETE COM 56585A102 2,610 -410 -13.58 223 15.54 0.0057
2022-01-12 2021-12-31 13F MARATHON PETE COM 56585A102 3,020 320 11.85 193 15.57 0.0049
2021-10-18 2021-09-30 13F MARATHON PETE COM 56585A102 2,700 -667 -19.81 167 -17.73 0.0047
2021-07-12 2021-06-30 13F MARATHON PETE COM 56585A102 3,367 1,288 61.95 203 82.88 0.0059
2021-04-21 2021-03-31 13F MARATHON PETE COM 56585A102 2,079 1,103 113.01 111 282.76 0.0036
2021-01-08 2020-12-31 13F MARATHON PETE COM 56585A102 976 0 0.00 29 0.00 0.0012
2020-10-06 2020-09-30 13F MARATHON PETE COM 56585A102 976 200 25.77 29 0.00 0.0012
2020-07-10 2020-06-30 13F MARATHON PETE COM 56585A102 776 -175 -18.40 29 31.82 0.0013
2020-04-07 2020-03-31 13F MARATHON PETE COM 56585A102 951 0 0.00 22 -61.40 0.0012
2020-01-15 2019-12-31 13F MARATHON PETE COM 56585A102 951 0 0.00 57 -1.72 0.0025
2019-10-10 2019-09-30 13F MARATHON PETE COM 56585A102 951 145 17.99 58 28.89 0.0028
2019-07-16 2019-06-30 13F MARATHON PETE COM 56585A102 806 -3,116 -79.45 45 -80.85 0.0023
2019-04-11 2019-03-31 13F MARATHON PETE COM 56585A102 3,922 3,020 334.81 235 343.40 0.0152
2019-01-18 2018-12-31 13F MARATHON PETE COM 56585A102 902 120 15.35 53 -15.87 0.0032
2018-10-11 2018-09-30 13F MARATHON PETE COM 56585A102 782 330 73.01 63 96.88 0.0032
2018-08-09 2018-06-30 13F MARATHON PETE COM 56585A102 452 14 3.20 32 0.00 0.0017
2018-04-10 2018-03-31 13F MARATHON PETE COM 56585A102 438 -23 -4.99 32 6.67 0.0017
2018-02-07 2017-12-31 13F MARATHON PETE COM 56585A102 461 461 30 0.0017
2017-10-16 2017-09-30 13F MARATHON PETE COM 56585A102 0 -438 -100.00 0 -100.00
2017-07-19 2017-06-30 13F MARATHON PETE COM 56585A102 438 -260 -37.25 23 -34.29 0.0016
2017-04-11 2017-03-31 13F MARATHON PETE COM 56585A102 698 1 0.14 35 0.00 0.0027
2017-01-17 2016-12-31 13F MARATHON PETE COM 56585A102 697 697 35 0.0031
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.