Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionNEOS Investment Management LLC
Latest Disclosed Ownership42,877 shares
Latest Disclosed Value $ 10,469,706
NEOS Investment Management LLC reports 10.55% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - NEOS Investment Management LLC filed a 13F-HR form disclosing ownership of 42,877 shares of Marathon Petroleum Corporation (MX:MPC) valued at $10,469,706 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 38,784 shares of Marathon Petroleum Corporation. This represents a change in shares of 10.55% 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 42,877 4,093 10.55 10,470 65.99 0.0529
2026-02-17 2025-12-31 13F MARATHON PETE COM 56585A102 38,784 4,959 14.66 6,307 -3.25 0.0365
2025-11-07 2025-09-30 13F MARATHON PETE COM 56585A102 33,825 432 1.29 6,519 17.54 0.0488
2025-08-13 2025-06-30 13F MARATHON PETE COM 56585A102 33,393 7,126 27.13 5,547 44.96 0.0687
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 26,267 5,007 23.55 3,827 29.04 0.0726
2025-02-12 2024-12-31 13F MARATHON PETE COM 56585A102 21,260 4,974 30.54 2,966 11.76 0.0699
2024-11-13 2024-09-30 13F MARATHON PETE COM 56585A102 16,286 3,248 24.91 2,653 17.34 0.0801
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 13,038 3,984 44.00 2,262 23.96 0.0932
2024-05-13 2024-03-31 13F MARATHON PETE COM 56585A102 9,054 3,669 68.13 1,824 128.57 0.1130
2024-02-13 2023-12-31 13F MARATHON PETE COM 56585A102 5,385 904 20.17 799 17.70 0.0756
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 4,481 4,481 678 0.0866
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.