Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionEP Wealth Advisors, Inc.
Latest Disclosed Ownership18,662 shares
Latest Disclosed Value $ 4,556,825
EP Wealth Advisors, Inc. reports 6.86% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 14, 2026 - EP Wealth Advisors, Inc. filed a 13F-HR form disclosing ownership of 18,662 shares of Marathon Petroleum Corporation (US:MPC) valued at $4,556,887 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 20,036 shares of Marathon Petroleum Corporation. This represents a change in shares of -6.86% during the quarter. The current value of the position is $4,986,673 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)
2026-05-14 2026-03-31 13F MARATHON PETE COM 56585A102 18,662 -1,374 -6.86 4,557 39.84 0.0224
2026-02-18 2025-12-31 13F MARATHON PETE COM 56585A102 20,036 -13,410 -40.09 3,258 -41.35 0.0169
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 33,446 12,700 61.22 5,556 83.82 0.0365
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 20,746 -568 -2.66 3,022 1.65 0.0241
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 21,314 2,143 11.18 2,973 -4.80 0.0243
2024-11-15 2024-09-30 13F MARATHON PETE COM 56585A102 19,171 3,534 22.60 3,123 15.15 0.0268
2024-08-19 2024-06-30 13F MARATHON PETE COM 56585A102 15,637 373 2.44 2,713 -11.80 0.0288
2024-05-14 2024-03-31 13F MARATHON PETE COM 56585A102 15,264 -96 -0.62 3,076 34.99 0.0360
2024-02-28 2023-12-31 13F MARATHON PETE COM 56585A102 15,360 -1,719 -10.06 2,279 -11.84 0.0291
2023-11-24 2023-09-30 13F MARATHON PETE COM 56585A102 17,079 14,658 605.45 2,585 28.94 0.0401
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 2,421 -23,488 -90.66 2,005 4.81 0.0289
2023-06-05 2023-03-31 13F MARATHON PETE COM 56585A102 25,909 11,050 74.37 1,913 10.58 0.0329
2023-06-12 2022-12-31 13F MARATHON PETE COM 56585A102 14,859 -252 -1.67 1,729 15.19 0.0312
2022-12-02 2022-09-30 13F MARATHON PETE COM 56585A102 15,111 7,866 108.57 1,501 151.85 0.0340
2022-08-11 2022-06-30 13F MARATHON PETE COM 56585A102 7,245 233 3.32 596 -0.67 0.0134
2022-05-20 2022-03-31 13F MARATHON PETE COM 56585A102 7,012 65 0.94 600 34.83 0.0132
2022-02-17 2021-12-31 13F MARATHON PETE COM 56585A102 6,947 2,593 59.55 445 65.43 0.0105
2021-11-23 2021-09-30 13F/A-1 MARATHON PETE COM 56585A102 4,354 320 7.93 269 10.25 0.0074
2021-11-16 2021-09-30 13F MARATHON PETE COM 56585A102 11,160 7,126 269 0.0074
2021-08-24 2021-06-30 13F MARATHON PETE COM 56585A102 4,034 54 1.36 244 14.55 0.0068
2021-05-17 2021-03-31 13F MARATHON PETE COM 56585A102 3,980 -4,148 -51.03 213 -36.61 0.0068
2021-02-18 2020-12-31 13F MARATHON PETE COM 56585A102 8,128 8,128 104.22 336 57.75 0.0118
2020-08-14 2020-06-30 13F MARATHON PETE COM 56585A102 0 -42,658 -100.00 0 -100.00
2020-05-18 2020-03-31 13F MARATHON PETE COM 56585A102 42,658 -151,094 -77.98 1,008 -91.37 0.0493
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 193,752 2,066 1.08 11,674 0.25 0.4807
2019-11-18 2019-09-30 13F MARATHON PETE COM 56585A102 191,686 25,248 15.17 11,645 25.20 0.5775
2019-08-27 2019-06-30 13F MARATHON PETE COM 56585A102 166,438 8,799 5.58 9,301 -1.42 0.5811
2019-05-20 2019-03-31 13F MARATHON PETE COM 56585A102 157,639 9,534 6.44 9,435 7.95 0.9072
2019-02-15 2018-12-31 13F MARATHON PETE COM 56585A102 148,105 148,105 8,740 0.6741
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.