Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionChatham Capital Group, Inc.
Latest Disclosed Ownership1,968 shares
Latest Disclosed Value $ 480,546
Chatham Capital Group, Inc. reports 5.20% decrease in ownership of MPC / Marathon Petroleum Corporation

On April 20, 2026 - Chatham Capital Group, Inc. filed a 13F-HR form disclosing ownership of 1,968 shares of Marathon Petroleum Corporation (US:MPC) valued at $480,546 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 2,076 shares of Marathon Petroleum Corporation. This represents a change in shares of -5.20% during the quarter. The current value of the position is $525,869 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)
2026-04-20 2026-03-31 13F MARATHON PETE COM 56585A102 1,968 -108 -5.20 481 42.43 0.0697
2026-01-14 2025-12-31 13F MARATHON PETE COM 56585A102 2,076 0 0.00 338 -15.75 0.0480
2025-10-15 2025-09-30 13F MARATHON PETE COM 56585A102 2,076 0 0.00 400 16.28 0.0576
2025-07-17 2025-06-30 13F MARATHON PETE COM 56585A102 2,076 0 0.00 345 13.91 0.0526
2025-04-10 2025-03-31 13F MARATHON PETE COM 56585A102 2,076 0 0.00 302 4.50 0.0505
2025-02-07 2024-12-31 13F MARATHON PETE COM 56585A102 2,076 0 0.00 290 -14.50 0.0476
2024-10-16 2024-09-30 13F MARATHON PETE COM 56585A102 2,076 0 0.00 338 -6.11 0.0553
2024-07-15 2024-06-30 13F MARATHON PETE COM 56585A102 2,076 0 0.00 360 -13.88 0.0629
2024-04-18 2024-03-31 13F MARATHON PETE COM 56585A102 2,076 82 4.11 418 41.69 0.0768
2024-01-19 2023-12-31 13F MARATHON PETE COM 56585A102 1,994 0 0.00 296 -1.99 0.0599
2023-10-26 2023-09-30 13F MARATHON PETE COM 56585A102 1,994 0 0.00 302 29.74 0.0674
2023-07-14 2023-06-30 13F MARATHON PETE COM 56585A102 1,994 0 0.00 232 -13.43 0.0489
2023-04-24 2023-03-31 13F MARATHON PETE COM 56585A102 1,994 0 0.00 269 15.52 0.0601
2023-02-01 2022-12-31 13F MARATHON PETE COM 56585A102 1,994 1,994 232 0.0544
2016-04-29 2016-03-31 13F MARATHON PETE COM 56585A102 0 -109,868 -100.00 0 -100.00
2016-02-02 2015-12-31 13F MARATHON PETE COM 56585A102 109,868 -2,120 -1.89 5,696 9.79 1.8270
2015-10-23 2015-09-30 13F MARATHON PETE COM 56585A102 111,988 -200 -0.18 5,188 -11.60 1.7494
2015-07-31 2015-06-30 13F MARATHON PETE COM 56585A102 112,188 54,193 93.44 5,869 -1.16 1.6514
2015-04-28 2015-03-31 13F MARATHON PETE COM 56585A102 57,995 -12,650 -17.91 5,938 -6.87 1.7405
2015-02-05 2014-12-31 13F MARATHON PETE COM 56585A102 70,645 200 0.28 6,376 6.89 1.9021
2014-11-06 2014-09-30 13F MARATHON PETE COM 56585A102 70,445 75 0.11 5,965 8.57 1.8530
2014-08-08 2014-06-30 13F MARATHON PETE COM 56585A102 70,370 350 0.50 5,494 -9.86 2.1516
2014-04-28 2014-03-31 13F MARATHON PETE COM 56585A102 70,020 350 0.50 6,095 -4.63 2.5220
2014-02-04 2013-12-31 13F MARATHON PETE COM 56585A102 69,670 200 0.29 6,391 43.04 2.6584
2013-10-30 2013-09-30 13F MARATHON PETE COM 56585A102 69,470 630 0.92 4,468 -8.67 2.0318
2013-08-08 2013-06-30 13F MARATHON PETE COM 56585A102 68,840 68,840 4,892 2.3880
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.