Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionPutnam Fl Investment Management Co
Latest Disclosed Ownership10,677 shares
Latest Disclosed Value $ 2,607,006
Putnam Fl Investment Management Co reports 4.43% increase in ownership of MPC / Marathon Petroleum Corporation

On May 5, 2026 - Putnam Fl Investment Management Co filed a 13F-HR form disclosing ownership of 10,677 shares of Marathon Petroleum Corporation (MX:MPC) valued at $2,607,006 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 10,224 shares of Marathon Petroleum Corporation. This represents a change in shares of 4.43% 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)
2026-05-05 2026-03-31 13F MARATHON PETE COM 56585A102 10,677 453 4.43 2,607 56.86 0.0388
2026-02-09 2025-12-31 13F MARATHON PETE COM 56585A102 10,224 2,302 29.06 1,663 8.91 0.0242
2025-10-10 2025-09-30 13F MARATHON PETE COM 56585A102 7,922 -401 -4.82 1,527 10.42 0.0228
2025-08-12 2025-06-30 13F MARATHON PETE COM 56585A102 8,323 -286 -3.32 1,382 10.21 0.0237
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 8,609 -832 -8.81 1,254 -4.71 0.0235
2025-02-05 2024-12-31 13F MARATHON PETE COM 56585A102 9,441 -5,607 -37.26 1,317 -46.31 0.0241
2024-11-08 2024-09-30 13F MARATHON PETE COM 56585A102 15,048 -20,182 -57.29 2,451 -59.89 0.0441
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 35,230 -6,347 -15.27 6,112 -27.05 0.1146
2024-05-03 2024-03-31 13F MARATHON PETE COM 56585A102 41,577 1,166 2.89 8,378 39.73 0.1784
2024-01-30 2023-12-31 13F MARATHON PETE COM 56585A102 40,411 272 0.68 5,995 -1.30 0.1413
2023-11-06 2023-09-30 13F MARATHON PETE COM 56585A102 40,139 -15,754 -28.19 6,075 -6.80 0.1684
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 55,893 -4,728 -7.80 6,517 -20.26 0.1775
2023-04-27 2023-03-31 13F MARATHON PETE COM 56585A102 60,621 446 0.74 8,173 16.71 0.2665
2023-01-31 2022-12-31 13F MARATHON PETE COM 56585A102 60,175 -1,975 -3.18 7,004 13.45 0.2549
2022-11-07 2022-09-30 13F MARATHON PETE COM 56585A102 62,150 -3,046 -4.67 6,173 15.17 0.2400
2022-08-08 2022-06-30 13F MARATHON PETE COM 56585A102 65,196 91 0.14 5,360 -3.70 0.1968
2022-04-28 2022-03-31 13F MARATHON PETE COM 56585A102 65,105 2,794 4.48 5,566 39.60 0.1776
2022-02-15 2021-12-31 13F MARATHON PETE COM 56585A102 62,311 3,300 5.59 3,987 9.32 0.1223
2021-10-26 2021-09-30 13F MARATHON PETE COM 56585A102 59,011 20,009 51.30 3,647 54.73 0.1238
2021-08-11 2021-06-30 13F MARATHON PETE COM 56585A102 39,002 39,002 2,357 0.0813
2020-05-08 2020-03-31 13F Marathon Petroleum COM 56585A102 0 -3,674 -100.00 0 -100.00
2020-01-30 2019-12-31 13F Marathon Petroleum COM 56585A102 3,674 3,674 221 0.0136
2019-07-25 2019-06-30 13F Marathon Petroleum COM 56585A102 0 -11,090 -100.00 0 -100.00
2019-05-15 2019-03-31 13F Marathon Petroleum COM 56585A102 11,090 -4,916 -30.71 664 -29.74 0.0558
2019-02-22 2018-12-31 13F Marathon Petroleum COM 56585A102 16,006 -7,609 -32.22 945 -49.95 0.1027
2018-11-13 2018-09-30 13F Marathon Petroleum COM 56585A102 23,615 14,200 150.82 1,888 185.63 0.1729
2018-08-01 2018-06-30 13F Marathon Petroleum COM 56585A102 9,415 4,096 77.01 661 69.92 0.0640
2018-05-01 2018-03-31 13F Marathon Petroleum COM 56585A102 5,319 -182 -3.31 389 7.16 0.0356
2018-02-06 2017-12-31 13F Marathon Petroleum COM 56585A102 5,501 -1,877 -25.44 363 -12.32 0.0333
2017-11-07 2017-09-30 13F Marathon Petroleum COM 56585A102 7,378 42 0.57 414 11.59 0.0395
2017-05-12 2017-03-31 13F Marathon Petroleum COM 56585A102 7,336 7,336 371 0.0385
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.