Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionCIBC World Markets Inc.
Latest Disclosed Ownership210,483 shares
Latest Disclosed Value $ 51,395,739
CIBC World Markets Inc. reports 1.57% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 14, 2026 - CIBC World Markets Inc. filed a 13F-HR form disclosing ownership of 210,483 shares of Marathon Petroleum Corporation (MX:MPC) valued at $51,395,739 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 213,851 shares of Marathon Petroleum Corporation. This represents a change in shares of -1.57% 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)
2026-05-14 2026-03-31 13F MARATHON PETE COM 56585A102 210,483 -3,368 -1.57 51,396 47.78 0.0839
2026-02-10 2025-12-31 13F MARATHON PETE COM 56585A102 213,851 74,611 53.58 34,779 29.59 0.0561
2025-11-06 2025-09-30 13F MARATHON PETE COM 56585A102 139,240 -3,638 -2.55 26,837 13.08 0.0481
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 142,878 38,745 37.21 23,733 56.44 0.0470
2025-05-14 2025-03-31 13F MARATHON PETE COM 56585A102 104,133 75,163 259.45 15,171 379,175.00 0.0325
2025-01-23 2024-12-31 13F MARATHON PETE COM 56585A102 28,970 4,893 20.32 4 33.33 0.0085
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 24,077 -9,835 -29.00 4 -40.00 0.0082
2024-08-07 2024-06-30 13F MARATHON PETE COM 56585A102 33,912 -1,246 -3.54 6 -28.57 0.0136
2024-05-13 2024-03-31 13F MARATHON PETE COM 56585A102 35,158 6,497 22.67 7 75.00 0.0168
2024-02-13 2023-12-31 13F MARATHON PETE COM 56585A102 28,661 1,026 3.71 4 0.00 0.0108
2023-11-13 2023-09-30 13F MARATHON PETE COM 56585A102 27,635 591 2.19 4 33.33 0.0138
2023-08-11 2023-06-30 13F MARATHON PETE COM 56585A102 27,044 -29,168 -51.89 3 -57.14 0.0100
2023-05-12 2023-03-31 13F MARATHON PETE COM 56585A102 56,212 34,992 164.90 8 250.00 0.0255
2023-02-13 2022-12-31 13F MARATHON PETE COM 56585A102 21,220 13,890 189.50 2 -99.73 0.0087
2022-11-10 2022-09-30 13F MARATHON PETE COM 56585A102 7,330 -3,020 -29.18 728 -14.45 0.0028
2022-08-10 2022-06-30 13F MARATHON PETE COM 56585A102 10,350 7,052 213.83 851 201.77 0.0030
2022-05-12 2022-03-31 13F MARATHON PETE COM 56585A102 3,298 3,298 282 0.0009
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 0 -13,149 -100.00 0 -100.00
2021-11-12 2021-09-30 13F MARATHON PETE COM 56585A102 13,149 7,052 115.66 813 120.92 0.0027
2021-08-12 2021-06-30 13F MARATHON PETE COM 56585A102 6,097 -242 -3.82 368 8.55 0.0010
2021-05-11 2021-03-31 13F MARATHON PETE COM 56585A102 6,339 -5,159 -44.87 339 -28.78 0.0010
2021-02-08 2020-12-31 13F MARATHON PETE COM 56585A102 11,498 -2,433 -17.46 476 16.38 0.0015
2020-11-12 2020-09-30 13F MARATHON PETE COM 56585A102 13,931 -4,546 -24.60 409 -40.81 0.0018
2020-08-13 2020-06-30 13F MARATHON PETE COM 56585A102 18,477 -42,515 -69.71 691 -52.05 0.0031
2020-05-15 2020-03-31 13F MARATHON PETE COM 56585A102 60,992 700 1.16 1,441 -60.34 0.0074
2020-02-13 2019-12-31 13F MARATHON PETE COM 56585A102 60,292 1,221 2.07 3,633 1.23 0.0148
2019-11-13 2019-09-30 13F MARATHON PETE COM 56585A102 59,071 -352 -0.59 3,589 8.07 0.0161
2019-08-08 2019-06-30 13F MARATHON PETE COM 56585A102 59,423 -10,791 -15.37 3,321 -20.97 0.0147
2019-05-09 2019-03-31 13F MARATHON PETE COM 56585A102 70,214 3,493 5.24 4,202 6.73 0.0193
2019-02-13 2018-12-31 13F MARATHON PETE COM 56585A102 66,721 -20,449 -23.46 3,937 -43.52 0.0201
2018-11-09 2018-09-30 13F MARATHON PETE COM 56585A102 87,170 37,531 75.61 6,971 100.14 0.0299
2018-08-08 2018-06-30 13F MARATHON PETE COM 56585A102 49,639 -801 -1.59 3,483 -5.56 0.0152
2018-05-18 2018-03-31 13F MARATHON PETE COM 56585A102 50,440 43,062 583.65 3,688 657.29 0.0152
2018-02-01 2017-12-31 13F MARATHON PETE COM 56585A102 7,378 -94,235 -92.74 487 -91.45 0.0022
2017-11-13 2017-09-30 13F MARATHON PETE COM 56585A102 101,613 93,021 1,082.65 5,698 1,166.22 0.0273
2017-08-10 2017-06-30 13F MARATHON PETE COM 56585A102 8,592 -796,990 -98.93 450 -98.89 0.0019
2017-05-08 2017-03-31 13F MARATHON PETE COM 56585A102 805,582 795,753 8,095.97 40,714 8,125.05 0.1312
2017-05-08 2016-12-31 13F/A-1 MARATHON PETE COM 56585A102 9,829 -24,412 -71.29 495 -64.39 0.0018
2017-01-09 2016-12-31 13F MARATHON PETE COM 56585A102 9,829 -24,412 495 0.0020
2017-05-08 2016-09-30 13F/A-1 MARATHON PETE COM 56585A102 34,241 -9,774 -22.21 1,390 -16.82 0.0056
2016-11-03 2016-09-30 13F MARATHON PETE COM 56585A102 34,241 -9,774 1,390 0.0060
2016-07-21 2016-06-30 13F MARATHON PETE COM 56585A102 44,015 -21,619 -32.94 1,671 -31.52 0.0074
2016-05-04 2016-03-31 13F MARATHON PETE COM 56585A102 65,634 26,696 68.56 2,440 20.85 0.0113
2016-01-14 2015-12-31 13F MARATHON PETE COM 56585A102 38,938 -11,729 -23.15 2,019 -13.98 0.0102
2015-10-26 2015-09-30 13F/A-1 MARATHON PETE COM 56585A102 50,667 -12,260 -19.48 2,347 -28.71 0.0116
2015-10-22 2015-09-30 13F MARATHON PETE COM 56585A102 50,667 -12,260 2,347 0.0118
2015-07-22 2015-06-30 13F MARATHON PETE COM 56585A102 62,927 -2,072 -3.19 3,292 -50.53 0.0143
2015-04-23 2015-03-31 13F MARATHON PETE COM 56585A102 64,999 64,999 0.00 6,655 0.0272
2015-02-04 2014-12-31 13F MARATHON PETE COM 56585A102 0 -39,169 -100.00 0 -100.00
2014-10-22 2014-09-30 13F MARATHON PETE COM 56585A102 39,169 10,123 34.85 3,316 46.21 0.0119
2014-08-08 2014-06-30 13F MARATHON PETE COM 56585A102 29,046 -13,242 -31.31 2,268 -38.39 0.0079
2014-05-13 2014-03-31 13F MARATHON PETE COM 56585A102 42,288 21,126 99.83 3,681 89.64 0.0141
2014-02-07 2013-12-31 13F MARATHON PETE COM 56585A102 21,162 15,711 288.22 1,941 452.99 0.0080
2013-11-05 2013-09-30 13F MARATHON PETE COM 56585A102 5,451 -20,310 -78.84 351 -80.83 0.0015
2013-08-07 2013-06-30 13F MARATHON PETE COM 56585A102 25,761 25,761 1,831 0.0082
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.