Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionVontobel Holding Ltd.
Latest Disclosed Ownership13,978 shares
Latest Disclosed Value $ 3,413,148
Vontobel Holding Ltd. reports 5.11% increase in ownership of MPC / Marathon Petroleum Corporation

On May 8, 2026 - Vontobel Holding Ltd. filed a 13F-HR form disclosing ownership of 13,978 shares of Marathon Petroleum Corporation (MX:MPC) valued at $3,413,148 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 13,299 shares of Marathon Petroleum Corporation. This represents a change in shares of 5.11% 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)
2026-05-08 2026-03-31 13F MARATHON PETE COM 56585A102 13,978 679 5.11 3,413 57.86 0.0117
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 13,299 4,378 49.08 2,163 25.77 0.0068
2025-10-15 2025-09-30 13F MARATHON PETE COM 56585A102 8,921 439 5.18 1,719 22.09 0.0052
2025-07-23 2025-06-30 13F MARATHON PETE COM 56585A102 8,482 -4,865 -36.45 1,409 -27.57 0.0045
2025-04-28 2025-03-31 13F MARATHON PETE COM 56585A102 13,347 -3,152 -19.10 1,945 -15.51 0.0071
2025-01-30 2024-12-31 13F MARATHON PETE COM 56585A102 16,499 5,661 52.23 2,302 30.37 0.0079
2024-10-16 2024-09-30 13F MARATHON PETE COM 56585A102 10,838 -3,911 -26.52 1,766 -31.00 0.0057
2024-08-13 2024-06-30 13F MARATHON PETE COM 56585A102 14,749 4,584 45.10 2,559 24.90 0.0083
2024-05-10 2024-03-31 13F MARATHON PETE COM 56585A102 10,165 -6,044 -37.29 2,048 -14.81 0.0164
2024-06-04 2023-12-31 13F/A-1 MARATHON PETE COM 56585A102 16,209 4,584 39.43 2,405 36.67 0.0201
2024-01-30 2023-12-31 13F MARATHON PETE COM 56585A102 24,257 12,632 3,599 0.0181
2024-06-04 2023-09-30 13F/A-1 MARATHON PETE COM 56585A102 11,625 -2,856 -19.72 1,759 4.21 0.0162
2023-10-11 2023-09-30 13F MARATHON PETE COM 56585A102 20,882 -5,535 3,160 0.0176
2024-06-04 2023-06-30 13F/A-1 MARATHON PETE COM 56585A102 14,481 -1,842 -11.28 1,688 -23.27 0.0148
2023-07-24 2023-06-30 13F MARATHON PETE COM 56585A102 26,417 10,094 3,080 0.0163
2024-06-04 2023-03-31 13F/A-1 MARATHON PETE COM 56585A102 16,323 629 4.01 2,201 22.43 0.0205
2023-04-12 2023-03-31 13F MARATHON PETE COM 56585A102 30,119 14,425 4,061 0.0231
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 15,694 -2,621 -14.31 1,797 -0.61 0.0181
2022-11-04 2022-09-30 13F MARATHON PETE COM 56585A102 18,315 1,215 7.11 1,808 25.21 0.0211
2022-07-27 2022-06-30 13F MARATHON PETE COM 56585A102 17,100 -1,459 -7.86 1,444 -8.84 0.0156
2022-05-13 2022-03-31 13F MARATHON PETE COM 56585A102 18,559 293 1.60 1,584 36.79 0.0137
2022-02-14 2021-12-31 13F/A-1 MARATHON PETE COM 56585A102 18,266 9,365 105.21 1,158 110.55 0.0096
2022-02-10 2021-12-31 13F MARATHON PETE COM 56585A102 8,901 0 550 0.0021
2021-10-29 2021-09-30 13F MARATHON PETE COM 56585A102 8,901 -5,973 -40.16 550 -38.48 0.0049
2021-08-06 2021-06-30 13F MARATHON PETE COM 56585A102 14,874 6,648 80.82 894 102.72 0.0077
2021-05-11 2021-03-31 13F MARATHON PETE COM 56585A102 8,226 -32,406 -79.75 441 -78.07 0.0033
2021-02-12 2020-12-31 13F/A-1 MARATHON PETE COM 56585A102 40,632 40,632 2,011 0.0132
2021-02-12 2020-12-31 13F MARATHON PETE COM 56585A102 40,632 2,011 0.0132
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.