Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionSmartleaf Asset Management LLC
Latest Disclosed Ownership8,643 shares
Latest Disclosed Value $ 2,119,002
Smartleaf Asset Management LLC reports 6.11% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - Smartleaf Asset Management LLC filed a 13F-HR form disclosing ownership of 8,643 shares of Marathon Petroleum Corporation (MX:MPC) valued at $2,119,002 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 8,145 shares of Marathon Petroleum Corporation. This represents a change in shares of 6.11% 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 8,643 498 6.11 2,119 58.85 0.0765
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 8,145 -178 -2.14 1,334 -18.41 0.0506
2025-11-05 2025-09-30 13F MARATHON PETE COM 56585A102 8,323 1,969 30.99 1,635 53.81 0.1012
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 6,354 -603 -8.67 1,064 6.09 0.0937
2025-05-14 2025-03-31 13F MARATHON PETE COM 56585A102 6,957 451 6.93 1,003 13.61 0.0967
2025-02-05 2024-12-31 13F MARATHON PETE COM 56585A102 6,506 1,029 18.79 882 -1.56 0.0900
2024-11-13 2024-09-30 13F MARATHON PETE COM 56585A102 5,477 1,777 48.03 896 40.22 0.1088
2024-10-08 2024-06-30 13F/A-1 MARATHON PETE COM 56585A102 3,700 361 10.81 640 -2.74 0.1049
2024-08-13 2024-06-30 13F MARATHON PETE COM 56585A102 3,700 361 640 0.1049
2024-10-07 2024-03-31 13F/A-1 MARATHON PETE COM 56585A102 3,339 644 23.90 658 75.67 0.1272
2024-05-03 2024-03-31 13F MARATHON PETE COM 56585A102 3,339 644 210 0.0504
2024-02-12 2023-12-31 13F MARATHON PETE COM 56585A102 2,695 2,695 374 0.1002
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.