Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionAdage Capital Partners Gp, L.l.c.
ManagerPhil Gross, Robert Atchinson
Latest Disclosed Ownership239,260 shares
Latest Disclosed Value $ 58,422,507
Adage Capital Partners Gp, L.l.c. reports 39.62% increase in ownership of MPC / Marathon Petroleum Corporation

On May 15, 2026 - Adage Capital Partners Gp, L.l.c. filed a 13F-HR form disclosing ownership of 239,260 shares of Marathon Petroleum Corporation (MX:MPC) valued at $58,422,507 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 171,360 shares of Marathon Petroleum Corporation. This represents a change in shares of 39.62% 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)
2026-05-15 2026-03-31 13F MARATHON PETE COM 56585A102 239,260 67,900 39.62 58,423 109.64 0.0901
2026-02-17 2025-12-31 13F MARATHON PETE COM 56585A102 171,360 69,600 68.40 27,868 42.09 0.0422
2025-11-14 2025-09-30 13F MARATHON PETE COM 56585A102 101,760 -4,600 -4.32 19,613 11.01 0.0311
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 106,360 -167,000 -61.09 17,667 -55.64 0.0298
2025-05-15 2025-03-31 13F MARATHON PETE COM 56585A102 273,360 -11,900 -4.17 39,826 0.08 0.0738
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 285,260 29,800 11.67 39,794 -4.38 0.0696
2024-11-14 2024-09-30 13F MARATHON PETE COM 56585A102 255,460 2,500 0.99 41,617 -5.17 0.0735
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 252,960 -13,000 -4.89 43,884 -18.11 0.0813
2024-05-15 2024-03-31 13F MARATHON PETE COM 56585A102 265,960 -7,900 -2.88 53,591 31.90 0.1012
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 273,860 -43,700 -13.76 40,630 -15.46 0.0841
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 317,560 -25,200 -7.35 48,060 20.25 0.1090
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 342,760 -11,800 -3.33 39,966 -16.40 0.0868
2023-05-15 2023-03-31 13F MARATHON PETE COM 56585A102 354,560 -122,100 -25.62 47,805 -13.83 0.1072
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 476,660 -31,300 -6.16 55,478 9.95 0.1327
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 507,960 -55,500 -9.85 50,456 8.92 0.1251
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 563,460 -391,100 -40.97 46,322 -43.24 0.1062
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 954,560 -401,400 -29.60 81,615 -5.94 0.1550
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 1,355,960 27,100 2.04 86,768 5.64 0.1562
2021-11-15 2021-09-30 13F MARATHON PETE COM 56585A102 1,328,860 490,200 58.45 82,137 62.10 0.1618
2021-08-16 2021-06-30 13F MARATHON PETE COM 56585A102 838,660 -216,600 -20.53 50,672 -10.23 0.0992
2021-05-17 2021-03-31 13F MARATHON PETE COM 56585A102 1,055,260 386,400 57.77 56,446 104.04 0.1153
2021-02-16 2020-12-31 13F MARATHON PETE COM 56585A102 668,860 -456,850 -40.58 27,664 -16.24 0.0603
2020-11-16 2020-09-30 13F MARATHON PETE COM 56585A102 1,125,710 176,400 18.58 33,028 -6.92 0.0827
2020-08-14 2020-06-30 13F MARATHON PETE COM 56585A102 949,310 -669,800 -41.37 35,485 -7.21 0.0909
2020-05-15 2020-03-31 13F MARATHON PETE COM 56585A102 1,619,110 -350,165 -17.78 38,243 -67.77 0.1142
2020-02-14 2019-12-31 13F MARATHON PETE COM 56585A102 1,969,275 -1,973,132 -50.05 118,649 -50.46 0.2914
2019-11-14 2019-09-30 13F MARATHON PETE COM 56585A102 3,942,407 -32,400 -0.82 239,501 7.83 0.5881
2019-08-14 2019-06-30 13F MARATHON PETE COM 56585A102 3,974,807 2,983,447 300.94 222,112 274.35 0.5530
2019-05-15 2019-03-31 13F MARATHON PETE COM 56585A102 991,360 -34,771 -3.39 59,333 -2.01 0.1484
2019-02-14 2018-12-31 13F MARATHON PETE COM 56585A102 1,026,131 1,026,131 60,552 0.1678
2018-11-14 2018-09-30 13F MARATHON PETE COM 56585A102 0 -797,752 -100.00 0 -100.00
2018-08-14 2018-06-30 13F MARATHON PETE COM 56585A102 797,752 215,252 36.95 55,970 31.43 0.1282
2018-05-15 2018-03-31 13F MARATHON PETE COM 56585A102 582,500 -410,200 -41.32 42,587 -34.98 0.0991
2018-02-14 2017-12-31 13F MARATHON PETE COM 56585A102 992,700 -233,300 -19.03 65,498 -4.74 0.1481
2017-11-14 2017-09-30 13F MARATHON PETE COM 56585A102 1,226,000 1,226,000 68,754 0.1671
2017-08-14 2017-06-30 13F MARATHON PETE COM 56585A102 0 -1,209,900 -100.00 0 -100.00
2017-05-15 2017-03-31 13F MARATHON PETE COM 56585A102 1,209,900 99,100 8.92 61,148 9.33 0.1541
2017-02-14 2016-12-31 13F MARATHON PETE COM 56585A102 1,110,800 -90,400 -7.53 55,929 14.71 0.1528
2016-11-14 2016-09-30 13F MARATHON PETE COM 56585A102 1,201,200 -31,600 -2.56 48,757 4.19 0.1343
2016-08-15 2016-06-30 13F MARATHON PETE COM 56585A102 1,232,800 335,500 37.39 46,797 40.27 0.1277
2016-05-16 2016-03-31 13F MARATHON PETE COM 56585A102 897,300 -272,500 -23.29 33,362 -44.99 0.0905
2016-02-16 2015-12-31 13F MARATHON PETE COM 56585A102 1,169,800 -410,200 -25.96 60,642 -17.16 0.1589
2015-11-16 2015-09-30 13F MARATHON PETE COM 56585A102 1,580,000 1,580,000 0.00 73,201 0.2032
2015-08-14 2015-06-30 13F MARATHON PETE COM 56585A102 0 -1,025,507 -100.00 0 -100.00
2015-05-15 2015-03-31 13F MARATHON PETE COM 56585A102 1,025,507 -966,165 -48.51 105,002 -41.59 0.2560
2015-02-17 2014-12-31 13F MARATHON PETE COM 56585A102 1,991,672 -786,197 -28.30 179,768 -23.57 0.4398
2014-11-14 2014-09-30 13F MARATHON PETE COM 56585A102 2,777,869 982,050 54.69 235,202 67.76 0.5812
2014-08-14 2014-06-30 13F MARATHON PETE COM 56585A102 1,795,819 -161,653 -8.26 140,200 -17.71 0.3623
2014-05-15 2014-03-31 13F MARATHON PETE COM 56585A102 1,957,472 822,400 72.45 170,378 63.64 0.4653
2014-02-14 2013-12-31 13F MARATHON PETE COM 56585A102 1,135,072 -265,000 -18.93 104,120 15.62 0.2757
2013-11-14 2013-09-30 13F MARATHON PETE COM 56585A102 1,400,072 195,896 16.27 90,053 5.24 0.2589
2013-08-14 2013-06-30 13F MARATHON PETE COM 56585A102 1,204,176 27,804 2.36 85,569 -18.82 0.2638
2013-07-12 2013-03-31 13F/A-1 MARATHON PETE COM 56585A102 1,176,372 1,176,372 105,403 0.3483
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.