Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionReaves W H & Co Inc
Latest Disclosed Ownership220,615 shares
Latest Disclosed Value $ 53,869,771
Reaves W H & Co Inc reports 32.10% increase in ownership of MPC / Marathon Petroleum Corporation

On May 7, 2026 - Reaves W H & Co Inc filed a 13F-HR form disclosing ownership of 220,615 shares of Marathon Petroleum Corporation (MX:MPC) valued at $53,869,771 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 167,000 shares of Marathon Petroleum Corporation. This represents a change in shares of 32.10% 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)
2026-05-07 2026-03-31 13F MARATHON PETROLEUM COM 56585A102 220,615 53,615 32.10 53,870 98.35 0.6437
2026-02-10 2025-12-31 13F MARATHON PETROLEUM COM 56585A102 167,000 67,000 67.00 27,159 40.91 0.4751
2025-11-06 2025-09-30 13F MARATHON PETROLEUM COM 56585A102 100,000 -50,000 -33.33 19,274 -22.64 0.3433
2025-08-11 2025-06-30 13F MARATHON PETROLEUM COM 56585A102 150,000 0 0.00 24,916 14.02 0.5524
2025-05-09 2025-03-31 13F MARATHON PETROLEUM COM 56585A102 150,000 15,000 11.11 21,854 121,305.56 0.5561
2025-02-06 2024-12-31 13F MARATHON PETROLEUM COM 56585A102 135,000 135,000 19 0.4965
2020-08-06 2020-06-30 13F MARATHON PETROLEUM COM 56585A102 0 -581,147 -100.00 0 -100.00
2020-05-07 2020-03-31 13F MARATHON PETROLEUM COM 56585A102 581,147 -199,619 -25.57 13,727 -70.82 0.6349
2020-02-06 2019-12-31 13F MARATHON PETROLEUM COM 56585A102 780,766 -221,871 -22.13 47,041 -22.77 1.4735
2019-11-07 2019-09-30 13F MARATHON PETROLEUM COM 56585A102 1,002,637 -69,879 -6.52 60,910 1.63 1.8714
2019-08-08 2019-06-30 13F MARATHON PETROLEUM COM 56585A102 1,072,516 731,172 214.20 59,932 193.37 1.9139
2019-05-08 2019-03-31 13F MARATHON PETROLEUM COM 56585A102 341,344 -28,236 -7.64 20,429 -6.33 0.6742
2019-02-07 2018-12-31 13F MARATHON PETROLEUM COM 56585A102 369,580 134,474 57.20 21,809 16.00 0.7985
2018-11-08 2018-09-30 13F MARATHON PETROLEUM COM 56585A102 235,106 -1,695 -0.72 18,801 13.16 0.6148
2018-08-08 2018-06-30 13F MARATHON PETROLEUM COM 56585A102 236,801 -16,134 -6.38 16,614 -10.16 0.5637
2018-05-08 2018-03-31 13F MARATHON PETROLEUM COM 56585A102 252,935 -8,713 -3.33 18,492 7.11 0.6542
2018-02-08 2017-12-31 13F MARATHON PETROLEUM COM 56585A102 261,648 -71,249 -21.40 17,264 -7.53 0.5453
2017-11-08 2017-09-30 13F MARATHON PETROLEUM COM 56585A102 332,897 -88,233 -20.95 18,669 -15.29 0.6762
2017-08-08 2017-06-30 13F MARATHON PETROLEUM COM 56585A102 421,130 -16,921 -3.86 22,038 -0.46 0.8146
2017-05-09 2017-03-31 13F MARATHON PETROLEUM COM 56585A102 438,051 -19,381 -4.24 22,139 -3.88 0.8058
2017-02-08 2016-12-31 13F MARATHON PETROLEUM COM 56585A102 457,432 11,662 2.62 23,032 27.29 0.8637
2016-11-09 2016-09-30 13F MARATHON PETROLEUM COM 56585A102 445,770 -54,525 -10.90 18,094 -4.72 0.6643
2016-08-09 2016-06-30 13F MARATHON PETROLEUM COM 56585A102 500,295 17,077 3.53 18,991 5.71 0.6617
2016-05-11 2016-03-31 13F MARATHON PETROLEUM COM 56585A102 483,218 483,218 9,564.36 17,966 5,479.50 0.6424
2014-02-07 2013-12-31 13F MARATHON PETROLEUM COM 56585A102 0 -5,000 -100.00 0 -100.00
2013-11-08 2013-09-30 13F MARATHON PETROLEUM COM 56585A102 5,000 5,000 322 0.0099
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.