Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionMassachusetts Financial Services Co /ma/
Latest Disclosed Ownership939 shares
Latest Disclosed Value $ 229,285
Massachusetts Financial Services Co /ma/ ownership in MPC / Marathon Petroleum Corporation

On May 14, 2026 - Massachusetts Financial Services Co /ma/ filed a 13F-HR form disclosing ownership of 939 shares of Marathon Petroleum Corporation (MX:MPC) valued at $229,285 USD as of March 31, 2026. The entity filed a previous 13F-HR on November 12, 2024 disclosing 0 shares of Marathon Petroleum Corporation.

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 939 939 229 0.0001
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 0 -1,418 -100.00 0 -100.00
2024-08-09 2024-06-30 13F MARATHON PETE COM 56585A102 1,418 -95,938 -98.54 246 -98.75 0.0001
2024-05-14 2024-03-31 13F MARATHON PETE COM 56585A102 97,356 -5,294 -5.16 19,617 28.81 0.0059
2024-02-08 2023-12-31 13F MARATHON PETE COM 56585A102 102,650 1,542 1.53 15,229 -0.47 0.0049
2023-11-08 2023-09-30 13F MARATHON PETE COM 56585A102 101,108 -1,485 -1.45 15,302 27.91 0.0054
2023-08-09 2023-06-30 13F MARATHON PETE COM 56585A102 102,593 256 0.25 11,962 -13.31 0.0039
2023-05-10 2023-03-31 13F MARATHON PETE COM 56585A102 102,337 -32,918 -24.34 13,798 -12.35 0.0047
2023-02-13 2022-12-31 13F MARATHON PETE COM 56585A102 135,255 31,563 30.44 15,742 52.83 0.0055
2022-11-09 2022-09-30 13F MARATHON PETE COM 56585A102 103,692 46,263 80.56 10,300 118.17 0.0039
2022-08-09 2022-06-30 13F MARATHON PETE COM 56585A102 57,429 23,560 69.56 4,721 63.02 0.0016
2022-05-11 2022-03-31 13F MARATHON PETE COM 56585A102 33,869 33,869 2,896 0.0009
2020-11-12 2020-09-30 13F MARATHON PETE COM 56585A102 0 -150,649 -100.00 0 -100.00
2020-11-20 2020-06-30 13F/A-1 MARATHON PETE COM 56585A102 150,649 -211,377 -58.39 6 -99.94 0.0022
2020-08-11 2020-06-30 13F MARATHON PETE COM 56585A102 150,649 -211,377 5,631 2,222.1010
2020-11-20 2020-03-31 13F/A-1 MARATHON PETE COM 56585A102 362,026 -1,647,854 -81.99 8,552 -92.94 0.0041
2020-05-14 2020-03-31 13F MARATHON PETE COM 56585A102 362,026 -1,647,854 8,552 4,079.9972
2020-11-25 2019-12-31 13F/A-1 MARATHON PETE COM 56585A102 2,009,880 -367,387 -15.45 121,096 83,994.44 0.0455
2020-02-13 2019-12-31 13F MARATHON PETE COM 56585A102 2,009,880 -367,387 121,096 45,550.4013
2020-11-20 2019-09-30 13F/A-1 MARATHON PETE COM 56585A102 2,377,267 -1,618,951 -40.51 144 -99.94 0.0580
2019-11-05 2019-09-30 13F MARATHON PETE COM 56585A102 2,377,267 -1,618,951 144,418 58,024.8391
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 3,996,218 -218,985 -5.20 223,307 -11.48 0.0910
2019-05-13 2019-03-31 13F MARATHON PETE COM 56585A102 4,215,203 263,522 6.67 252,281 8.19 0.1063
2019-02-08 2018-12-31 13F MARATHON PETE COM 56585A102 3,951,681 1,198,618 43.54 233,190 5.92 0.1119
2018-10-25 2018-09-30 13F MARATHON PETE COM 56585A102 2,753,063 -48,446 -1.73 220,164 12.01 0.0907
2018-07-30 2018-06-30 13F MARATHON PETE COM 56585A102 2,801,509 570,514 25.57 196,553 20.50 0.0842
2018-05-04 2018-03-31 13F MARATHON PETE COM 56585A102 2,230,995 1,929,448 639.85 163,108 719.80 0.0699
2018-02-14 2017-12-31 13F MARATHON PETE COM 56585A102 301,547 11,830 4.08 19,896 22.46 0.0083
2017-11-14 2017-09-30 13F MARATHON PETE COM 56585A102 289,717 289,717 16,247 0.0071
2017-05-09 2016-12-31 13F/A-1 MARATHON PETE COM 56585A102 0 -1,137,200 -100.00 0 -100.00
2017-05-09 2016-09-30 13F/A-1 MARATHON PETE COM 56585A102 1,137,200 -1,645,602 -59.13 46,160 -56.30 0.0225
2016-11-14 2016-09-30 13F MARATHON PETE COM 56585A102 1,137,200 -1,645,602 46,160 22,493.0127
2017-05-09 2016-06-30 13F/A-1 MARATHON PETE COM 56585A102 2,782,802 -130,275 -4.47 105,635 -2.47 0.0532
2016-08-12 2016-06-30 13F MARATHON PETE COM 56585A102 2,782,802 -130,275 105,635 53,242.8491
2017-05-09 2016-03-31 13F/A-1 MARATHON PETE COM 56585A102 2,913,077 268,527 10.15 108,309 -21.00 0.0563
2016-05-12 2016-03-31 13F MARATHON PETE COM 56585A102 2,913,077 945,768 108,309 56,303.0743
2016-02-12 2015-12-31 13F MARATHON PETE COM 56585A102 2,644,550 -173,991 -6.17 137,094 4.99 0.0732
2015-11-12 2015-09-30 13F MARATHON PETE COM 56585A102 2,818,541 -1,397,876 -33.15 130,582 -40.80 0.0730
2015-08-13 2015-06-30 13F MARATHON PETE COM 56585A102 4,216,417 1,795,783 74.19 220,561 -11.01 0.1122
2015-05-13 2015-03-31 13F MARATHON PETE COM 56585A102 2,420,634 -105,465 -4.18 247,849 8.70 0.1254
2015-02-13 2014-12-31 13F MARATHON PETE COM 56585A102 2,526,099 558,790 28.40 228,006 36.88 0.1160
2014-11-13 2014-09-30 13F MARATHON PETE COM 56585A102 1,967,309 8,605 0.44 166,572 8.93 0.0881
2014-08-13 2014-06-30 13F MARATHON PETE COM 56585A102 1,958,704 181,950 10.24 152,916 -1.12 0.0799
2014-05-13 2014-03-31 13F MARATHON PETE COM 56585A102 1,776,754 153,324 9.44 154,649 3.85 0.0846
2014-02-12 2013-12-31 13F MARATHON PETE COM 56585A102 1,623,430 69,907 4.50 148,917 49.03 0.0835
2013-11-08 2013-09-30 13F MARATHON PETE COM 56585A102 1,553,523 306,237 24.55 99,923 12.74 0.0619
2013-08-14 2013-06-30 13F MARATHON PETE COM 56585A102 1,247,286 1,247,286 88,632 0.0599
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.