Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionJohnson Investment Counsel Inc
Latest Disclosed Ownership12,251 shares
Latest Disclosed Value $ 2,991,492
Johnson Investment Counsel Inc reports 11.01% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 1, 2026 - Johnson Investment Counsel Inc filed a 13F-HR form disclosing ownership of 12,251 shares of Marathon Petroleum Corporation (MX:MPC) valued at $2,991,492 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 13,767 shares of Marathon Petroleum Corporation. This represents a change in shares of -11.01% 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)
2026-05-01 2026-03-31 13F MARATHON PETE COM 56585A102 12,251 -1,516 -11.01 2,991 33.65 0.0242
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 0 -100.00 0
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 13,767 2,239
2025-11-06 2025-09-30 13F MARATHON PETE COM 56585A102 14,580 114 0.79 2,810 16.99 0.0235
2025-07-25 2025-06-30 13F MARATHON PETE COM 56585A102 14,466 524 3.76 2,403 18.27 0.0215
2025-04-21 2025-03-31 13F MARATHON PETE COM 56585A102 13,942 -445 -3.09 2,031 1.25 0.0196
2025-02-07 2024-12-31 13F MARATHON PETE COM 56585A102 14,387 -402 -2.72 2,007 -16.73 0.0196
2024-11-04 2024-09-30 13F MARATHON PETROLEUM CS 56585A102 14,789 337 2.33 2,409 -3.91 0.0237
2024-08-08 2024-06-30 13F MARATHON PETROLEUM CS 56585A102 14,452 -146 -1.00 2,507 -14.76 0.0264
2024-05-09 2024-03-31 13F MARATHON PETROLEUM CS 56585A102 14,598 -7 -0.05 2,941 35.78 0.0320
2024-02-07 2023-12-31 13F MARATHON PETROLEUM CS 56585A102 14,605 1,221 9.12 2,167 6.96 0.0255
2023-11-13 2023-09-30 13F MARATHON PETROLEUM CS 56585A102 13,384 312 2.39 2,026 32.87 0.0260
2023-08-10 2023-06-30 13F MARATHON PETROLEUM COM 56585A102 13,072 1,695 14.90 1,524 -0.59 0.0189
2023-05-15 2023-03-31 13F MARATHON PETROLEUM COM 56585A102 11,377 796 7.52 1,534 24.53 0.0204
2023-02-14 2022-12-31 13F MARATHON PETROLEUM COM 56585A102 10,581 -96 -0.90 1,232 16.02 0.0168
2022-11-14 2022-09-30 13F MARATHON PETROLEUM COM 56585A102 10,677 62 0.58 1,061 21.53 0.0157
2022-08-15 2022-06-30 13F MARATHON PETROLEUM COM 56585A102 10,615 2,045 23.86 873 19.10 0.0124
2022-05-11 2022-03-31 13F Marathon Petroleum COMMON EQUITY 56585A102 8,570 120 1.42 733 35.49 0.0091
2022-02-15 2021-12-31 13F Marathon Petroleum COMMON EQUITY 56585A102 8,450 -1,085 -11.38 541 -8.15 0.0066
2021-11-12 2021-09-30 13F Marathon Petroleum COMMON EQUITY 56585A102 9,535 -807 -7.80 589 -5.76 0.0079
2021-08-13 2021-06-30 13F Marathon Petroleum COMMON EQUITY 56585A102 10,342 -100 -0.96 625 11.81 0.0089
2021-05-14 2021-03-31 13F Marathon Petroleum COMMON EQUITY 56585A102 10,442 390 3.88 559 34.38 0.0084
2021-02-12 2020-12-31 13F Marathon Petroleum COMMON EQUITY 56585A102 10,052 -11 -0.11 416 41.02 0.0069
2020-11-16 2020-09-30 13F Marathon Petroleum COMMON EQUITY 56585A102 10,063 -1,020 -9.20 295 -28.74 0.0055
2020-08-13 2020-06-30 13F Marathon Petroleum COMMON EQUITY 56585A102 11,083 -3,937 -26.21 414 16.62 0.0084
2020-05-20 2020-03-31 13F Marathon Petroleum COMMON EQUITY 56585A102 15,020 -3,175 -17.45 355 -67.61 0.0079
2020-02-13 2019-12-31 13F Marathon Petroleum COMMON EQUITY 56585A102 18,195 2,231 13.98 1,096 12.99 0.0206
2019-11-14 2019-09-30 13F Marathon Petroleum COMMON 56585A102 15,964 2,227 16.21 970 26.47 0.0193
2019-08-14 2019-06-30 13F MARATHON PETROLEUM Common 56585A102 13,737 -8,989 -39.55 767 -43.60 0.0159
2019-05-13 2019-03-31 13F MARATHON PETROLEUM Common 56585A102 22,726 -2,181 -8.76 1,360 -7.42 0.0290
2019-02-13 2018-12-31 13F MARATHON PETROLEUM Common 56585A102 24,907 8,283 49.83 1,469 10.53 0.0357
2018-11-14 2018-09-30 13F MARATHON PETROLEUM Common 56585A102 16,624 2,818 20.41 1,329 37.29 0.0295
2018-08-14 2018-06-30 13F MARATHON PETROLEUM Common 56585A102 13,806 2,089 17.83 968 13.08 0.0237
2018-05-15 2018-03-31 13F MARATHON PETROLEUM Common 56585A102 11,717 -188 -1.58 856 9.04 0.0219
2018-02-14 2017-12-31 13F MARATHON PETROLEUM Common 56585A102 11,905 1,320 12.47 785 32.38 0.0196
2017-11-14 2017-09-30 13F MARATHON PETROLEUM Common 56585A102 10,585 -315 -2.89 593 4.04 0.0157
2017-08-14 2017-06-30 13F MARATHON PETROLEUM Common 56585A102 10,900 -1,279 -10.50 570 -7.32 0.0159
2017-05-12 2017-03-31 13F MARATHON PETROLEUM Common 56585A102 12,179 200 1.67 615 1.99 0.0178
2017-02-14 2016-12-31 13F MARATHON PETROLEUM Common 56585A102 11,979 706 6.26 603 31.95 0.0186
2016-11-14 2016-09-30 13F MARATHON PETROLEUM Common 56585A102 11,273 2,555 29.31 457 38.48 0.0146
2016-08-11 2016-06-30 13F MARATHON PETROLEUM Common 56585A102 8,718 -421 -4.61 330 -2.65 0.0109
2016-05-13 2016-03-31 13F MARATHON PETROLEUM Common 56585A102 9,139 1,947 27.07 339 -8.87 0.0119
2016-02-12 2015-12-31 13F MARATHON PETROLEUM Common 56585A102 7,192 1,349 23.09 372 37.78 0.0130
2015-11-16 2015-09-30 13F MARATHON PETROLEUM Common 56585A102 5,843 841 16.81 270 3.45 0.0099
2015-08-14 2015-06-30 13F MARATHON PETROLEUM Common 56585A102 5,002 2,659 113.49 261 9.21 0.0088
2015-05-14 2015-03-31 13F MARATHON PETROLEUM Common 56585A102 2,343 2,343 0.00 239 0.0080
2014-11-14 2014-09-30 13F MARATHON PETROLEUM Common 56585A102 0 -5,632 -100.00 0 -100.00
2014-08-14 2014-06-30 13F MARATHON PETROLEUM Common 56585A102 5,632 380 7.24 439 -3.94 0.0157
2014-05-15 2014-03-31 13F MARATHON PETROLEUM Common 56585A102 5,252 -67 -1.26 457 -6.16 0.0168
2014-02-13 2013-12-31 13F MARATHON PETROLEUM Common 56585A102 5,319 -123 -2.26 487 39.14 0.0180
2013-11-13 2013-09-30 13F MARATHON PETROLEUM Common 56585A102 5,442 -836 -13.32 350 -21.52 0.0140
2013-08-14 2013-06-30 13F MARATHON PETROLEUM Common 56585A102 6,278 6,278 446 0.0185
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.