Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionPanagora Asset Management Inc
Latest Disclosed Ownership551,934 shares
Latest Disclosed Value $ 134,771,244
Panagora Asset Management Inc reports 289.74% increase in ownership of MPC / Marathon Petroleum Corporation

On May 14, 2026 - Panagora Asset Management Inc filed a 13F-HR form disclosing ownership of 551,934 shares of Marathon Petroleum Corporation (MX:MPC) valued at $134,771,244 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 141,616 shares of Marathon Petroleum Corporation. This represents a change in shares of 289.74% 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 551,934 410,318 289.74 134,771 485.17 0.5049
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 141,616 -655,830 -82.24 23,031 -85.02 0.0816
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 797,446 -86,317 -9.77 153,700 4.70 0.6193
2025-08-13 2025-06-30 13F MARATHON PETE COM 56585A102 883,763 605,705 217.83 146,802 262.38 0.6616
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 278,058 -392,696 -58.55 40,510 -56.71 0.2023
2025-02-13 2024-12-31 13F MARATHON PETE COM 56585A102 670,754 -46,816 -6.52 93,570 -19.96 0.4325
2024-11-13 2024-09-30 13F MARATHON PETE COM 56585A102 717,570 98,521 15.91 116,899 8.85 0.5586
2024-07-29 2024-06-30 13F MARATHON PETE COM 56585A102 619,049 241,746 64.07 107,393 41.26 0.5400
2024-05-07 2024-03-31 13F MARATHON PETE COM 56585A102 377,303 -2,467 -0.65 76,027 34.94 0.3963
2024-02-08 2023-12-31 13F MARATHON PETE COM 56585A102 379,770 -259,703 -40.61 56,343 -41.78 0.3152
2023-10-31 2023-09-30 13F MARATHON PETE COM 56585A102 639,473 -11,798 -1.81 96,778 27.44 0.6010
2023-08-11 2023-06-30 13F MARATHON PETE COM 56585A102 651,271 -131,642 -16.81 75,938 -28.06 0.4473
2023-05-12 2023-03-31 13F MARATHON PETE COM 56585A102 782,913 34,329 4.59 105,560 21.16 0.6672
2023-02-13 2022-12-31 13F MARATHON PETE COM 56585A102 748,584 220,381 41.72 87,128 66.06 0.5714
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 528,203 502,929 1,989.91 52,466 2,424.83 0.3638
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 25,274 -8,634 -25.46 2,078 -28.32 0.0136
2022-05-12 2022-03-31 13F MARATHON PETE COM 56585A102 33,908 6,043 21.69 2,899 62.59 0.0158
2022-02-10 2021-12-31 13F MARATHON PETE COM 56585A102 27,865 -6,676 -19.33 1,783 -16.49 0.0094
2021-11-10 2021-09-30 13F MARATHON PETE COM 56585A102 34,541 -212 -0.61 2,135 1.67 0.0114
2021-08-11 2021-06-30 13F MARATHON PETE COM 56585A102 34,753 -844 -2.37 2,100 10.29 0.0113
2021-05-12 2021-03-31 13F MARATHON PETROLEUM COMMON 56585A102 35,597 -5,785 -13.98 1,904 11.21 0.0107
2021-02-10 2020-12-31 13F MARATHON PETROLEUM COMMON 56585A102 41,382 -3,235 -7.25 1,712 30.79 0.0101
2020-11-13 2020-09-30 13F MARATHON PETROLEUM COMMON 56585A102 44,617 17,669 65.57 1,309 29.99 0.0082
2020-08-12 2020-06-30 13F MARATHON PETROLEUM COMMON 56585A102 26,948 -32,677 -54.80 1,007 -28.48 0.0064
2020-05-14 2020-03-31 13F MARATHON PETROLEUM COMMON 56585A102 59,625 13,238 28.54 1,408 -49.62 0.0100
2020-02-12 2019-12-31 13F MARATHON PETROLEUM COMMON 56585A102 46,387 -641,830 -93.26 2,795 -93.31 0.0127
2019-11-12 2019-09-30 13F MARATHON PETROLEUM COMMON 56585A102 688,217 629,692 1,075.94 41,809 1,178.56 0.1929
2019-08-09 2019-06-30 13F MARATHON PETROLEUM COMMON 56585A102 58,525 -38,742 -39.83 3,270 -43.82 0.0146
2019-05-15 2019-03-31 13F MARATHON PETROLEUM COMMON 56585A102 97,267 -621,039 -86.46 5,821 -86.27 0.0259
2019-02-14 2018-12-31 13F MARATHON PETROLEUM COMMON 56585A102 718,306 82,342 12.95 42,387 -16.66 0.1973
2018-11-13 2018-09-30 13F MARATHON PETROLEUM COMMON 56585A102 635,964 -564,652 -47.03 50,860 -39.62 0.1914
2018-08-14 2018-06-30 13F MARATHON PETROLEUM COMMON 56585A102 1,200,616 -419,294 -25.88 84,235 -28.87 0.3340
2018-05-15 2018-03-31 13F MARATHON PETROLEUM COMMON 56585A102 1,619,910 944,288 139.77 118,432 165.67 0.4672
2018-02-14 2017-12-31 13F MARATHON PETROLEUM COMMON 56585A102 675,622 -50 -0.01 44,578 17.64 0.1673
2017-11-14 2017-09-30 13F MARATHON PETROLEUM COMMON 56585A102 675,672 75,061 12.50 37,892 20.56 0.1500
2017-08-14 2017-06-30 13F MARATHON PETROLEUM COMMON 56585A102 600,611 154,811 34.73 31,430 39.50 0.1265
2017-05-15 2017-03-31 13F MARATHON PETROLEUM COMMON 56585A102 445,800 101,261 29.39 22,531 29.88 0.0938
2017-02-14 2016-12-31 13F MARATHON PETROLEUM COMMON 56585A102 344,539 233,341 209.84 17,348 284.40 0.0795
2016-11-14 2016-09-30 13F MARATHON PETROLEUM COMMON 56585A102 111,198 -422,318 -79.16 4,513 -77.72 0.0215
2016-08-15 2016-06-30 13F MARATHON PETROLEUM COMMON 56585A102 533,516 -84,227 -13.63 20,252 -11.83 0.1006
2016-05-16 2016-03-31 13F MARATHON PETROLEUM COMMON 56585A102 617,743 -692,903 -52.87 22,968 -66.20 0.1140
2016-02-12 2015-12-31 13F MARATHON PETROLEUM COMMON 56585A102 1,310,646 -2,908 -0.22 67,944 11.65 0.3348
2015-11-13 2015-09-30 13F MARATHON PETROLEUM COMMON 56585A102 1,313,554 166,483 14.51 60,857 1.42 0.3213
2015-08-14 2015-06-30 13F MARATHON PETROLEUM COMMON 56585A102 1,147,071 701,032 157.17 60,003 31.38 0.3008
2015-05-15 2015-03-31 13F MARATHON PETROLEUM COMMON 56585A102 446,039 -92,963 -17.25 45,670 -6.13 0.2319
2015-02-13 2014-12-31 13F MARATHON PETROLEUM COMMON 56585A102 539,002 -37,198 -6.46 48,650 -0.28 0.2488
2014-11-12 2014-09-30 13F MARATHON PETROLEUM COMMON 56585A102 576,200 43,526 8.17 48,787 17.32 0.2364
2014-08-14 2014-06-30 13F MARATHON PETROLEUM COMMON 56585A102 532,674 -198,497 -27.15 41,586 -34.66 0.2019
2014-05-15 2014-03-31 13F MARATHON PETROLEUM COMMON 56585A102 731,171 49,743 7.30 63,641 1.81 0.3006
2014-02-21 2013-12-31 13F MARATHON PETROLEUM COMMON 56585A102 681,428 326,406 91.94 62,507 173.73 0.2894
2013-11-14 2013-09-30 13F MARATHON PETROLEUM COMMON 56585A102 355,022 -1,186,086 -76.96 22,835 -79.15 0.1122
2013-08-14 2013-06-30 13F MARATHON PETROLEUM COMMON 56585A102 1,541,108 1,541,108 109,510 0.5601
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.